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Journal articles on the topic 'Huff model'

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Published: 4 June 2021

Last updated: 6 February 2022

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Griffith, Daniel A. "A Generalized Huff Model." Geographical Analysis 14, no. 2 (2010): 135–44. http://dx.doi.org/10.1111/j.1538-4632.1982.tb00062.x.

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Singla, Vikas, and Harpreet Rai. "Examining the Effectiveness of Huff Model in Store Performance Assessment." Jindal Journal of Business Research 7, no. 2 (2018): 122–34. http://dx.doi.org/10.1177/2278682118777033.

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Huff model and its variants have been used extensively in location decision making. This study has compared two versions of Huff model of location decision making in their appropriateness to analyze sales performance of selected shopping center. The sales have been estimated by using original Huff model given by David L. Huff (1964, Journal of Marketing, 28, 34–38) and modified version of it is suggested by Li and Liu in 2012 ( Applied Geography, 32, 591–600). The modified version considered the effects of agglomeration and competition on similar stores. But the selected stores were standalone stores. In this study instead, a famous shopping mall consisting of cluster of stores, which create bundling effect and provide more choices to customers, has been used to understand the effectiveness of discussed two versions of Huff model. The results were obtained for different agglomeration and competition factors in case of modified Huff model. These different factors were found to have significant influence on estimation of sales suggesting utmost care in their selection. Overall modified version was found to be more suitable in fulfilling the objective.

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Huff, David L., and William C. Black. "The Huff model in retrospect." Applied Geographic Studies 1, no. 2 (1997): 83–93. http://dx.doi.org/10.1002/(sici)1520-6319(199722)1:2<83::aid-ags1>3.0.co;2-p.

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Wang, Qi, Hanqiao Jiang, Jianfa Han, Daigang Wang, and Junjian Li. "Adaptive Prediction of Enhanced Oil Recovery by N2 huff-n-puff in Fractured-Cavity Reservoir Using an FNN-FDS Hybrid Model." Applied Sciences 11, no. 19 (2021): 8871. http://dx.doi.org/10.3390/app11198871.

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N2 huff-n-puff has proven to be a promising technique to further improve oil recovery in naturally fractured-cavity carbonate reservoirs. The effect of enhanced oil recovery (EOR) by N2 huff-n-puff is significantly affected by various dynamic and static factors such as type of reservoir space, reservoir connectivity, water influx, operational parameters, and so on, typically leading to a significant increase in oil production. To reduce the prediction uncertainty of EOR performance by N2 huff-n-puff, an adaptive hybrid model was proposed based on the fundamental principles of fuzzy neural network (FNN) and fractional differential simulation (FDS); a detailed prediction process of the hybrid model was also illustrated. The accuracy of the proposed FNN-FDS hybrid model was validated using production history of N2 huff-n-puff in a typical fractured-cavity carbonate reservoir. The proposed model was also employed to predict the EOR performance by N2 huff-n-puff in a naturally fractured-cavity carbonate reservoir. The methodology can serve as an effective tool to optimize developmental design schemes when using N2 huff-n-puff to tap more remaining oil in similar types of carbonate reservoirs.

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Kong, Xiangwen, Hongjun Wang, Wei Yu, Ping Wang, Jijun Miao, and Mauricio Fiallos-Torres. "Compositional Simulation of Geological and Engineering Controls on Gas Huff-n-Puff in Duvernay Shale Volatile Oil Reservoirs, Canada." Energies 14, no. 8 (2021): 2070. http://dx.doi.org/10.3390/en14082070.

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Duvernay shale is a world class shale deposit with a total resource of 440 billion barrels oil equivalent in the Western Canada Sedimentary Basin (WCSB). The volatile oil recovery factors achieved from primary production are much lower than those from the gas-condensate window, typically 5–10% of original oil in place (OOIP). The previous study has indicated that huff-n-puff gas injection is one of the most promising enhanced oil recovery (EOR) methods in shale oil reservoirs. In this paper, we built a comprehensive numerical compositional model in combination with the embedded discrete fracture model (EDFM) method to evaluate geological and engineering controls on gas huff-n-puff in Duvernay shale volatile oil reservoirs. Multiple scenarios of compositional simulations of huff-n-puff gas injection for the proposed twelve parameters have been conducted and effects of reservoir, completion and depletion development parameters on huff-n-puff are evaluated. We concluded that fracture conductivity, natural fracture density, period of primary depletion, and natural fracture permeability are the most sensitive parameters for incremental oil recovery from gas huff-n-puff. Low fracture conductivity and a short period of primary depletion could significantly increase the gas usage ratio and result in poor economical efficiency of the gas huff-n-puff process. Sensitivity analysis indicates that due to the increase of the matrix-surface area during gas huff-n-puff process, natural fractures associated with hydraulic fractures are the key controlling factors for gas huff-n-puff in Duvernay shale oil reservoirs. The range for the oil recovery increase over the primary recovery for one gas huff-n-puff cycle (nearly 2300 days of production) in Duvernay shale volatile oil reservoir is between 0.23 and 0.87%. Finally, we proposed screening criteria for gas huff-n-puff potential areas in volatile oil reservoirs from Duvernay shale. This study is highly meaningful and can give valuable reference to practical works conducting the huff-n-puff gas injection in both Duvernay and other shale oil reservoirs.

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Jang, Woo, Jason Rhodes, Dooyoung Shin, and Sung Kim. "RETAIL SITE ANALYSIS WITH THE HUFF MODEL." International Journal of Business Strategy 15, no. 3 (2015): 43–48. http://dx.doi.org/10.18374/ijbs-15-3.5.

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Hou, Ganggang, Xiaoli Ma, Wenyue Zhao, Pengxiang Diwu, Tongjing Liu, and Jirui Hou. "Synergistic Modes and Enhanced Oil Recovery Mechanism of CO2 Synergistic Huff and Puff." Energies 14, no. 12 (2021): 3454. http://dx.doi.org/10.3390/en14123454.

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With the gradual declining of oil increment performance of CO2 huff-and-puff wells, the overall oil exchange rate shows a downward tendency. In this regard, CO2 synergistic huff-and-puff technologies have been proposed to maintain the excellent effect and extend the technical life of such wells. However, there is no specific research on the mechanism and synergistic mode of CO2 huff and puff in horizontal wells. This study aims to establish the synergistic mode and determine the adaptability and acting mechanism of CO2 synergistic huff and puff. Three synergistic huff-and-puff modes are proposed based on the peculiarity of the fault-block reservoir’s small oil-bearing area and broken geological structure. We establish three typical CO2 synergistic huff-and-puff models and analyze the influence of different geological and development factors on the huff-and-puff performance with numerical simulation. Each factor’s sensitivity is clarified, and the enhanced oil recovery (EOR) mechanism of CO2 synergistic huff and puff is proposed. The sensitivity evaluation results show that the reservoir rhythm, inter-well passage, well spacing, high-position well liquid production rate, and middle-well liquid production rate are extremely sensitive factors; the stratum dip and injection volume allocation scheme are sensitive factors; and the relationship with structural isobaths is insensitive. The EOR mechanism of synergistic huff and puff includes gravity differentiation, supplementary formation energy, CO2 forming foam flooding, and coupling effect of production rate and oil reservoirs. The implementation conditions of the two-well cooperative stimulation mode are the simplest. The two-well model is suitable for thick oil layers with a positive rhythm and large formation dip. The single-well mode requires no channeling between the wells, and the multi-well mode requires multi-well rows and can control the intermediate well’s fluid production rate. Field application at C2X1 block shows a good performance with a total oil increment of 1280 t and an average water-cut reduction of 57.7%.

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Tang, Yong, Jiehong Tang, Qi Liu, et al. "Review on Phase Behavior in Tight Porous Media and Microscopic Flow Mechanism of CO2 Huff-n-Puff in Tight Oil Reservoirs." Geofluids 2020 (November 7, 2020): 1–15. http://dx.doi.org/10.1155/2020/8824743.

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The successful development of tight oil reservoirs in the U.S. shows the bright future of unconventional reservoirs. Tight oil reservoirs will be the main target of exploration and development in the future, and CO2 huff-n-puff is one of the most important methods to enhance oil recovery factor of tight oil reservoirs in North America. To improve the performance of CO2 huff-n-puff, injection and production parameters need to be optimized through numerical simulation. The phase behavior and microscopic flow mechanism of CO2 huff-n-puff in porous media need to be further investigated. This paper presents a detailed review of phase behavior and microscopic flow mechanism in tight porous media by CO2 huff-n-puff. Phase behavior in tight porous media is different from that in a PVT cylinder since the capillary pressure in tight porous media reduces the bubble point pressure and increases the miscibility pressure and critical temperature. The condensate pressure in tight porous media and nonequilibrium phase behavior need to be further investigated. The microscopic flow mechanism during CO2 huff-n-puff in tight porous media is complicated, and the impact of molecular diffusion, gas-liquid interaction, and fluid-rock interaction on multiphase flow is significant especially in tight porous media. Nuclear magnetic resonance (NMR) and molecular simulation are efficient methods to describe the microscopic flow in tight oil reservoirs, while the NMR is not cost-effective and molecular simulation needs to be improved to better characterize and model the feature of porous media. The improved molecular simulation is still a feasible method to understand the microscopic flow mechanism of CO2 huff-n-puff in tight oil reservoirs in the near future. The microscopic flow model in micropore network based on digital core is worth to be established, and phase behavior needs to be further incorporated into the microscopic flow model of CO2 huff-n-puff in tight porous media.

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Maurich, David. "Experimental Study of the Effect of Continuous Surfactant Injection Alternating Cyclic Huff & Puff Stimulation on Oil Efficiency Recovery in A 3D Reservoir Physical Model." JOURNAL OF APPLIED SCIENCE (JAPPS) 1, no. 2 (2019): 018–30. http://dx.doi.org/10.36870/japps.v1i2.49.

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Surfactant can displace oil which trapped by capillary effect, make it easier to be produced and finally improve oil recovery factor. However, the effectiveness of surfactant injection depends on many parameters such as surfactant-reservoir fluids properties and interaction, reservoir characteristics and its interaction with surfactant and also surfactant injection scenario or operational methods. This paper discusses about the effect of continuous surfactant injection alternating huff & puff stimulation on oil recovery factor from a quadrant of five-spot pattern in a 3D physical model made from a mixture of sands, cement and water with dimension of 15 cm x 15 cm x 2.5 cm to serve as the surrogate for oil reservoir in laboratory. In order to simulate the oil recovery from a secondary waterflooding process, 0.17 PV of formation water was injected into 3D reservoir physical model. This process could recover about 25.5% OOIP from the physical model, however the injection then shortly terminated due to a drastically increase of watercut. Residual oil then be recovered by a sequence of continuous surfactant injection alternating huff and puff stimulation method. The recovery factor by continuous surfactant injection combine with chase water drive gave a 5.5 % OOIP additional recovery and another 6.8 % OOIP after 24 hours surfactant huff & puff stimulation in the first sequence. After conducting 3 series of a combination of continuous surfactant injection alternating huff & puff stimulation, the total oil recovery from overall processes was about 51.7% OOIP. We presume that the lack of mobility control on macroscopic sweep efficiency in a 3D reservoir physical model is the rationale behind this moderate oil recovery which only produced by surfactant microscopic displacement efficiency. Nevertheless, the research shows that the combination of continuous surfactant injection alternating huff & puff stimulation obviously improve the recovery factor to some extent.

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Shi, Meilin, Krzysztof Janowicz, Ling Cai, Gengchen Mai, and Rui Zhu. "A Socially Aware Huff Model for Destination Choice in Nature-based Tourism." AGILE: GIScience Series 2 (June 4, 2021): 1–16. http://dx.doi.org/10.5194/agile-giss-2-14-2021.

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Abstract. Identifying determinants of tourist destination choice is an important task in the study of nature-based tourism. Traditionally, the study of tourist behavior relies on survey data and travel logs, which are labor-intensive and time-consuming. Thanks to location-based social networks, more detailed data is available at a finer grained spatio-temporal scale. This allows for better insights into travel patterns and interactions between attractions, e.g., parks. Meanwhile, such data sources also bring along a novel social influence component that has not yet been widely studied in terms of travel decisions. For example, social influencers post about certain places, which tend to influence destination choices of tourists. Therefore, in this paper, we propose a socially aware Huff model to account for this social factor in the study of destination choice. Moreover, with fine-grained social media data, interactions between attractions (i.e., the neighboring effects) can be better quantified and thus integrated into models as another factor. In our experiment, we calibrate a model by using trip sequences extracted from geotagged Flickr photos within two national parks in the United States. Our results demonstrate that the socially aware Huff model better simulates tourist travel preferences. In addition, we explore the significance of each factor and summarize the spatial-temporal travel pattern for each attraction. The socially aware Huff model and the calibration method can be applied to other fields such as promotional marketing.

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Meng, Xingbang, Zhan Meng, Jixiang Ma, and Tengfei Wang. "Performance Evaluation of CO2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs." Energies 12, no. 1 (2018): 42. http://dx.doi.org/10.3390/en12010042.

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When the reservoir pressure is decreased lower than the dew point pressure in shale gas condensate reservoirs, condensate would be formed in the formation. Condensate accumulation severely reduces the commercial production of shale gas condensate reservoirs. Seeking ways to mitigate condensate in the formation and enhance both condensate and gas recovery in shale reservoirs has important significance. Very few related studies have been done. In this paper, both experimental and numerical studies were conducted to evaluate the performance of CO2 huff-n-puff to enhance the condensate recovery in shale reservoirs. Experimentally, CO2 huff-n-puff tests on shale core were conducted. A theoretical field scale simulation model was constructed. The effects of injection pressure, injection time, and soaking time on the efficiency of CO2 huff-n-puff were examined. Experimental results indicate that condensate recovery was enhanced to 30.36% after 5 cycles of CO2 huff-n-puff. In addition, simulation results indicate that the injection period and injection pressure should be optimized to ensure that the pressure of the main condensate region remains higher than the dew point pressure. The soaking process should be determined based on the injection pressure. This work may shed light on a better understanding of the CO2 huff-n-puff- enhanced oil recovery (EOR) strategy in shale gas condensate reservoirs.

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Suárez-Vega, Rafael, José Luis Gutiérrez-Acuña, and Manuel Rodríguez-Díaz. "Locating a supermarket using a locally calibrated Huff model." International Journal of Geographical Information Science 29, no. 2 (2014): 217–33. http://dx.doi.org/10.1080/13658816.2014.958154.

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Jia, Xiaohan, Mingliang Luo, and Hui Pu. "Numerical simulation of CO2 huff-and-puff process in a hydraulically fractured horizontal well in a tight oil reservoir." Leading Edge 39, no. 1 (2020): 16–21. http://dx.doi.org/10.1190/tle39010016.1.

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A numerical reservoir model was built using Computer Modeling Group's GEM simulator to study the process of carbon dioxide (CO2) huff-and-puff in the Bakken tight formation. The influences of injection rate, production time, and soaking time on the incremental oil recovery factor (IORF) were studied systematically, as was the utilization efficiency of CO2 during the whole production process. The results showed that higher injection rates are preferable to lower ones, and the huff-and-puff process works best with a soaking time of 0 days. The production time of each cycle could be optimized for a specific case to maximize IORF, and CO2 efficiency was found to decrease with increasing number of cycles. This study may shed light on how to optimize the CO2 huff-and-puff process and therefore achieve the best enhanced oil recovery performance.

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SUZUKI, Ai, and Tatsuya KISHIMOTO. "STUDY ON COMPETITIVE FACILITY LOCATION MODEL BASED ON REILLY-HUFF INTEGRATION MODEL." Journal of Architecture and Planning (Transactions of AIJ) 75, no. 655 (2010): 2125–32. http://dx.doi.org/10.3130/aija.75.2125.

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Hao, Mingqiang, Songlin Liao, Guangming Yu, Xinhui Lei, and Yong Tang. "Performance Optimization of CO2 Huff-n-Puff for Multifractured Horizontal Wells in Tight Oil Reservoirs." Geofluids 2020 (November 15, 2020): 1–13. http://dx.doi.org/10.1155/2020/8840384.

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In this paper, the sensitivity factors of CO2 huff-n-puff for multifractured horizontal wells (MFHWs) in tight oil reservoirs were investigated through an experimental test and numerical simulation. The pressure-volume-temperature (PVT) experiment and the slim tube experiment are used to understand the interaction mechanism between CO2 and crude oil, and the minimum miscibility pressure (MMP) of the CO2-crude oil system is 17 MPa. The single-well model was firstly established to analyze the sensitivity factors on production performance of MFHWs by using CO2 huff-n-puff. The controlling factors of CO2 huff-n-puff for MFHWs in tight oil reservoirs were divided into three categories (i.e., reservoir parameters, well parameters, and injection-production parameters), and the impact of individual parameter on well performance was discussed in detail. The range of reservoir parameters suitable for CO2 huff-n-puff of MFHWs is obtained. The reservoir permeability is from 0.1 mD to 1 mD, the reservoir thickness changes from 10 m to 30 m, and the reservoir porosity is from 7% to 12%. Based on the reservoir parameters of the target reservoir, the reasonable well and fracture parameters are obtained. The sensitivity intensity was followed by the horizontal well length, fracture conductivity, fracture spacing, and fracture half-length. CO2 injection-production parameters are further optimized, and the sensitivity intensity was followed by the single-cycle cumulative CO2 injection rate, the soaking time, the injection rates, and the production rates. It provides a reference for parameter optimization of CO2 huff-n-puff for MFHWs in tight oil reservoirs.

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Yu, Haiyang, Songchao Qi, Zhewei Chen, Shiqing Cheng, Qichao Xie, and Xuefeng Qu. "Simulation Study of Allied In-Situ Injection and Production for Enhancing Shale Oil Recovery and CO2 Emission Control." Energies 12, no. 20 (2019): 3961. http://dx.doi.org/10.3390/en12203961.

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The global greenhouse effect makes carbon dioxide (CO2) emission reduction an important task for the world, however, CO2 can be used as injected fluid to develop shale oil reservoirs. Conventional water injection and gas injection methods cannot achieve desired development results for shale oil reservoirs. Poor injection capacity exists in water injection development, while the time of gas breakthrough is early and gas channeling is serious for gas injection development. These problems will lead to insufficient formation energy supplement, rapid energy depletion, and low ultimate recovery. Gas injection huff and puff (huff-n-puff), as another improved method, is applied to develop shale oil reservoirs. However, the shortcomings of huff-n-puff are the low sweep efficiency and poor performance for the late development of oilfields. Therefore, this paper adopts firstly the method of Allied In-Situ Injection and Production (AIIP) combined with CO2 huff-n-puff to develop shale oil reservoirs. Based on the data of Shengli Oilfield, a dual-porosity and dual-permeability model in reservoir-scale is established. Compared with traditional CO2 huff-n-puff and depletion method, the cumulative oil production of AIIP combined with CO2 huff-n-puff increases by 13,077 and 17,450 m3 respectively, indicating that this method has a good application prospect. Sensitivity analyses are further conducted, including injection volume, injection rate, soaking time, fracture half-length, and fracture spacing. The results indicate that injection volume, not injection rate, is the important factor affecting the performance. With the increment of fracture half-length and the decrement of fracture spacing, the cumulative oil production of the single well increases, but the incremental rate slows down gradually. With the increment of soaking time, cumulative oil production increases first and then decreases. These parameters have a relatively suitable value, which makes the performance better. This new method can not only enhance shale oil recovery, but also can be used for CO2 emission control.

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Lee, Pyoungsoo, and Dong-han Jeon. "An Extended Huff Model for Korean Home-furnishing Location Strategy." Korean Logistics Research Association 27, no. 1 (2017): 37–48. http://dx.doi.org/10.17825/klr.2017.27.1.37.

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Jia, Peng, Fahui Wang, and Imam M. Xierali. "Using a Huff-Based Model to Delineate Hospital Service Areas." Professional Geographer 69, no. 4 (2017): 522–30. http://dx.doi.org/10.1080/00330124.2016.1266950.

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Marić, Ivan, and Ante Šiljeg. "Application of Huff model in analysing market competition – example of shopping centres in the settlement of Zadar." Geoadria 22, no. 1 (2017): 41. http://dx.doi.org/10.15291/geoadria.1335.

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The object of the research is market competition between the shopping centres in the settlement of Zadar. The research is based on the spatial data collected by using various methods and techniques, which were analysed by applying the tools of geographic information system (GIS) with respect to specific laws of market economy. A categorization of shopping centres was made in order to define a broad trade area where the competition between the centres was analysed. A demographic raster was used to define the density of potential consumers within a broad market area. The competition analysis included the determination of the centres’ market zones, the occurrence of potential market cannibalism and the definition of the dominant shopping centre according to a variable of choice probability. The market zones were determined based on the attribute of duration of drive (min). On-site research, calculation of non-linear distance and the analysis of shopping centres’ density, led to a conclusion that market cannibalism occurs between the centres. For the purpose of predicting market dominance, Huff model was used to calculate average values of preference of centres within the zones of overlapping and the broad trade area. The results of Huff model confirm the market reality that a larger number of consumers within the zones of overlapping and the broad trade area prefer a more attractive shopping centre. The difference in number of people that visit a more attractive shopping centre was quantified by overlapping the demographic raster and the Huff model.

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Lu, Wei, and Xiaosheng Qin. "Integrated framework for assessing climate change impact on extreme rainfall and the urban drainage system." Hydrology Research 51, no. 1 (2019): 77–89. http://dx.doi.org/10.2166/nh.2019.233.

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Abstract Urban areas are becoming increasingly vulnerable to extreme storms and flash floods, which could be more damaging under climate change. This study presented an integrated framework for assessing climate change impact on extreme rainfall and urban drainage systems by incorporating a number of statistical and modelling techniques. Starting from synthetic future climate data generated by the stochastic weather generator, the simple scaling method and the Huff rainfall design were adopted for rainfall disaggregation and rainfall design. After having obtained 3-min level designed rainfall information, the urban hydrological model (i.e., Storm Water Management Model) was used to carry out the runoff analysis. A case study in a tropical city was used to demonstrate the proposed framework. Particularly, the impact of selecting different general circulation models and Huff distributions on future 1-h extreme rainfall and the performance of the urban drainage system were investigated. It was revealed that the proposed framework is flexible and easy to implement in generating temporally high-resolution rainfall data under climate model projections and offers a parsimonious way of assessing urban flood risks considering the uncertainty arising from climate change model projections, downscaling and rainfall design.

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Zhang, Ji Cheng, Jin Yu Lan, and Kao Ping Song. "Parameter Optimization of CO₂ Huff and Puff for S-16 Well Field." Advanced Materials Research 524-527 (May 2012): 1507–17. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1507.

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S-16 block of YSL oilfield is fault lithologic deposit. For the practical problems of low permeability, high injection pressure causing to difficult injection and low degree of reserve recovery due to delaying the supplement of producing energy, this paper applies the module E300 of Eclipse to establishing the triaxiality and triphase compositional model of the simulated block which takes the 11Y67-611 and 11Y69-56 as the target wells, completing the numerical simulation study of optimizing parameters of CO2 huff and puff by using of the evaluation indexes of oil increment and the oil-draining rate. It provided theoretical reference for YSL oilfield to carry out CO2 huff and puff that its optimized parameters.

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Tang, Yong, Zhengyuan Su, Jibo He, and Fulin Yang. "Numerical Simulation and Optimization of Enhanced Oil Recovery by the In Situ Generated CO2Huff-n-Puff Process with Compound Surfactant." Journal of Chemistry 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/6731848.

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This paper presents the numerical investigation and optimization of the operating parameters of the in situ generated CO2Huff-n-Puff method with compound surfactant on the performance of enhanced oil recovery. First, we conducted experiments of in situ generated CO2and surfactant flooding. Next, we constructed a single-well radial 3D numerical model using a thermal recovery chemical flooding simulator to simulate the process of CO2Huff-n-Puff. The activation energy and reaction enthalpy were calculated based on the reaction kinetics and thermodynamic models. The interpolation parameters were determined through history matching a series of surfactant core flooding results with the simulation model. The effect of compound surfactant on the Huff-n-Puff CO2process was demonstrated via a series of sensitivity studies to quantify the effects of a number of operation parameters including the injection volume and mole concentration of the reagent, the injection rate, the well shut-in time, and the oil withdrawal rate. Based on the daily production rate during the period of Huff-n-Puff, a desirable agreement was shown between the field applications and simulated results.

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Zhang, Xun, Xiaolan Xie, Yuxue Wang, et al. "A Digital Signage Audience Classification Model Based on the Huff Model and Backpropagation Neural Network." IEEE Access 8 (2020): 71708–20. http://dx.doi.org/10.1109/access.2020.2987717.

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Wang, Yandong, Wei Jiang, Senbao Liu, Xinyue Ye, and Teng Wang. "Evaluating Trade Areas Using Social Media Data with a Calibrated Huff Model." ISPRS International Journal of Geo-Information 5, no. 7 (2016): 112. http://dx.doi.org/10.3390/ijgi5070112.

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Liang, Yunlei, Song Gao, Yuxin Cai, Natasha Zhang Foutz, and Lei Wu. "Calibrating the dynamic Huff model for business analysis using location big data." Transactions in GIS 24, no. 3 (2020): 681–703. http://dx.doi.org/10.1111/tgis.12624.

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Gorji Ashtiani, Milad, Ahmad Makui, and Reza Ramezanian. "Huff-type competitive facility location model with foresight in a discrete space." Management Science Letters 1, no. 1 (2011): 1–12. http://dx.doi.org/10.5267/j.msl.2010.01.0010.

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De Beule, Matthias, Dirk Van den Poel, and Nico Van de Weghe. "An extended Huff-model for robustly benchmarking and predicting retail network performance." Applied Geography 46 (January 2014): 80–89. http://dx.doi.org/10.1016/j.apgeog.2013.09.026.

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Zheng, Zilai, Takehiro Morimoto, and Yuji Murayama. "Optimal Location Analysis of Delivery Parcel-Pickup Points Using AHP and Network Huff Model: A Case Study of Shiweitang Sub-District in Guangzhou City, China." ISPRS International Journal of Geo-Information 9, no. 4 (2020): 193. http://dx.doi.org/10.3390/ijgi9040193.

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The use of parcel-pickup points (PPPs) is an effective approach for solving the last-mile problem. However, few studies provide specific guidance for the optimal organization of PPPs. Here, a geographic information system(GIS)-based hybrid model was developed combining the widely used analytic hierarchy process (AHP) multi-criteria analysis method with the Huff model that predicts the number of visiting customers to determine the optimal facility for collaboration and service as a PPP. Using this model, a decision-maker can select the highest-ranking facility or use the fluctuation ranking graph to determine a priority list of candidate facilities according to the appropriate PPP service distance. Our findings suggest that the optimal candidate facility should be located near high population density areas, a dense road network, and few geographic barriers. The facility should have a high attractiveness value, long business hours, and convenient access to public transportation, cover a large, high-population area, and should be a retail chain store. Based on these findings, the AHP method can improve the accuracy of obtaining the facility attractiveness value using the Huff model. Facility attractiveness has a strong effect on the resulting number of customers in the case of acceptably long distances to residential buildings.

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Yu, Xinan, Xiaoping Li, Shuoliang Wang, and Yi Luo. "A Multicomponent Thermal Fluid Numerical Simulation Method considering Formation Damage." Geofluids 2021 (January 14, 2021): 1–15. http://dx.doi.org/10.1155/2021/8845896.

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Multicomponent thermal fluid huff and puff is an innovative heavy oil development technology for heavy oil reservoirs, which has been widely used in offshore oilfields in China and has proved to be a promising method for enhancing oil recovery. Components of multicomponent thermal fluids contain many components, including carbon dioxide, nitrogen, and steam. Under high temperature and high pressure conditions, the complex physical and chemical reactions between multicomponent thermal fluids and reservoir rocks occur, which damage the pore structure and permeability of core. In this paper, the authors set up a reservoir damage experimental device, tested the formation permeability before and after the injection of multiple-component thermal fluids, and obtained the formation damage model. The multicomponent thermal fluid formation damage model is embedded in the component control equation, the finite difference method is used to discretize the control equation, and a new multielement thermal fluid numerical simulator is established. The physical simulation experiment of multicomponent thermal fluid huff and puff is carried out by using the actual sand-packed model. By comparing the experimental results with the numerical simulation results, it is proved that the new numerical simulation model considering formation damage proposed in this paper is accurate and reliable.

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Vernieuwe, H., S. Vandenberghe, B. De Baets, and N. E. C. Verhoest. "A continuous rainfall model based on vine copulas." Hydrology and Earth System Sciences 19, no. 6 (2015): 2685–99. http://dx.doi.org/10.5194/hess-19-2685-2015.

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Abstract. Copulas have already proven their flexibility in rainfall modelling. Yet, their use is generally restricted to the description of bivariate dependence. Recently, vine copulas have been introduced, allowing multi-dimensional dependence structures to be described on the basis of a stage by stage mixing of 2-dimensional copulas. This paper explores the use of such vine copulas in order to incorporate all relevant dependences between the storm variables of interest. On the basis of such fitted vine copulas, an external storm structure is modelled. An internal storm structure is superimposed based on Huff curves, such that a continuous time series of rainfall is generated. The performance of the rainfall model is evaluated through a statistical comparison between an ensemble of synthetical rainfall series and the observed rainfall series and through the comparison of the annual maxima.

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Vernieuwe, H., S. Vandenberghe, B. De Baets, and N. E. C. Verhoest. "A continuous rainfall model based on vine copulas." Hydrology and Earth System Sciences Discussions 12, no. 1 (2015): 489–524. http://dx.doi.org/10.5194/hessd-12-489-2015.

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Abstract. Copulas have already proven their flexibility in rainfall modelling. Yet, their use is generally restricted to the description of bivariate dependence. Recently, vine copulas have been introduced, allowing multi-dimensional dependence structures to be described on the basis of a stage by stage mixing of two-dimensional copulas. This paper explores the use of such vine copulas in order to incorporate all relevant dependencies between the storm variables of interest. On the basis of such fitted vine copulas, an external storm structure is modeled. An internal storm structure is superimposed based on Huff curves, such that a continuous time series of rainfall is generated. The performance of the rainfall model is evaluated through a statistical comparison between an ensemble of synthetical rainfall series and the observed rainfall series and through the comparison of the annual maxima.

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Cronin, Michael, Hamid Emami-Meybodi, and Russell T. Johns. "Diffusion-Dominated Proxy Model for Solvent Injection in Ultratight Oil Reservoirs." SPE Journal 24, no. 02 (2018): 660–80. http://dx.doi.org/10.2118/190305-pa.

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Summary Enhanced oil recovery (EOR) by solvent injection offers significant potential to increase recovery from shale oil reservoirs, which is typically between 3 and 7% original oil in place (OOIP). The rather sparse literature on this topic typically models these tight reservoirs on the basis of conventional-reservoir processes and mechanisms, such as by convective transport using Darcy's law, even though there is little physical justification for this treatment. The literature also downplays the importance of the soaking period in huff ’n’ puff. In this paper, we propose, for the first time, a more physically realistic recovery mechanism based on solely diffusion-dominated transport. We develop a diffusion-dominated proxy model assuming first-contact miscibility (FCM) to provide rapid estimates of oil recovery for both primary production and the solvent huff ’n’ soak ’n’ puff (HSP) process in ultratight oil reservoirs. Simplified proxy models are developed to represent the major features of the fracture network. The key results show that diffusion-transport considered solely can reproduce the primary-production period within the Eagle Ford Shale and can model the HSP process well, without the need to use Darcy's law. The minimum miscibility pressure (MMP) concept is not important for ultratight shales where diffusion dominates because MMP is based on advection-dominated conditions. The mechanism for recovery is based solely on density and concentration gradients. Primary production is modeled as a self-diffusion process, whereas the HSP process is modeled as a counter-diffusion process. Incremental recoveries by HSP are several times greater than primary-production recoveries, showing significant promise in increasing oil recoveries. We calculate ultimate recoveries for both primary production and for the HSP process, and show that methane injection is preferred over carbon dioxide injection. We also show that the proxy model, to be accurate, must match the total matrix-contact area and the ratio of effective area to total contact area with time. These two parameters should be maximized for best recovery.

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Jeon, Jeongbae, Meejeong Park, Eunja Kim, Jinah Choi, and Changsu Lim. "Analysis of Central Place and Hinterland using Linear programming and Probability Model of Huff." Journal of Korean Society of Rural Planning 23, no. 1 (2017): 53–63. http://dx.doi.org/10.7851/ksrp.2017.23.1.053.

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Lin, Ting (Grace), Jianhong (Cecilia) Xia, Todd P. Robinson, et al. "Enhanced Huff model for estimating Park and Ride (PnR) catchment areas in Perth, WA." Journal of Transport Geography 54 (June 2016): 336–48. http://dx.doi.org/10.1016/j.jtrangeo.2016.06.011.

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Del Gatto, Massimo, and Carlo S. Mastinu. "A Huff model with firm heterogeneity and selection. Application to the Italian retail sector." Spatial Economic Analysis 13, no. 4 (2018): 442–56. http://dx.doi.org/10.1080/17421772.2018.1451914.

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Zhu, Zhenjun, Yudong He, Xiucheng Guo, Yibang Zhang, and Junlan Chen. "Improved Huff Model for Estimating Urban Rail Transit Station Catchment Areas considering Station Choices." Journal of Advanced Transportation 2021 (March 9, 2021): 1–11. http://dx.doi.org/10.1155/2021/6374724.

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Estimating urban rail transit station catchment areas is of great significance to deepening our understanding of Transit-Oriented Development in Chinese megacities. This study investigated station choices of residents and considered that residents may not only pay attention to the proximity to stations when the URT system develops into a relatively mature network. An improved Huff model was proposed to calculate the probability of residents’ station choice, which considered the station attractiveness. The station attractiveness is measured by three variables: walk score, public transport accessibility level, and service and facility index. The additive form based on multicriteria decision is adopted to incorporate experts’ opinions on the importance of three variables. In this study, extended catchment areas that can be accessed by cycling and feeder bus services are adopted to replace the conventional pedestrian-oriented catchment areas. A case study of Xi’an, China, was used to validate the applicability of the proposed methodology. The results revealed that the methodology effectively solved the problem. The findings could be used as a reference and provide technical support to policymakers and city planners with regard to the transport facilities configuration for URT station catchment areas, which contributes to facilitating transit-oriented development.

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Alhabeeb, M. J. "Spatial Models of Consumer Choice for Retail Outlets: Theory and Practice in Physics of Marketing." International Journal of Marketing Studies 11, no. 1 (2019): 1. http://dx.doi.org/10.5539/ijms.v11n1p1.

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A theoretical review and an assessment of applications of the spatial models of consumer choice for retail outlets are presented here. As they are also called gravitational models in marketing, they remain relevant in today&rsquo;s retail world despite the explosion of e-commerce. The major objective here is to emphasize the theoretical significance of these models, analyze their practicality in the market, and refer to their validity today. The focus would be on the original Reilly&rsquo;s model of the early thirties of the last century, and the two most significant improvements over it, Converse&rsquo;s model of the late forties, and Huff&rsquo;s model of the early sixties. After a detailed exposition of these models and their applications, a critical analysis is introduced to address the retail site selection, radius of the trading area, limitations of the models, and some criticism.

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Zhou, Yanxia, Xiangguo Lu, Bao Cao, Yigang Liu, Yunbao Zhang, and Xun Zhong. "Recovery Method and Parameter Optimization of a Pilot Test for Conformance Control Flooding and Thermal Recovery in the Offshore Heavy Oilfield." Geofluids 2021 (January 13, 2021): 1–14. http://dx.doi.org/10.1155/2021/6660468.

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NB35-2 oilfield is a typical offshore sandstone reservoir with viscous crude oil and high permeability. Due to the inherent severe heterogeneity, the efficiency of conventional water flooding is pretty low and usually accompanied with early water breakthrough. In order to recover the residual oil and better realize its potential, applications of enhanced oil recovery (EOR) technology are necessary. However, the selection of EOR method and related parameters may directly impact the final results and can be noticeably different for different reservoirs; therefore, to optimize the oil production rate and final oil recovery, systematical optimization of every detail based on the condition of a specific reservoir is of key importance. In this paper, physical simulations were first conducted to select the best recovery methods for the target area based on the static geophysical model under the guidance of reservoir engineering theory. Then, detailed development variants for each method were determined by numerical simulation with the support of data obtained from previous pilot tests (polymer gel flooding and thermal fluid huff and puff) conducted in this area. Three exploitation methods were developed for the target well group, including polymer gel flooding (conformance control, Pattern 1), steam huff and puff (thermal recovery method, Pattern 2), and a combination of polymer gel flooding and steam huff and puff (conformance control and thermal recovery, Pattern 3). The numerical simulation result also showed that Pattern 3 yielded the highest oil recovery. Moreover, the amount of additional oil being recovered by applying Pattern 3 was even higher than the total additional oil being extracted by Patterns 1 and 2. In addition, sensitivity analysis was conducted to rank the most important parameters based on the three Patterns. At last, it is thought that the synergistic effect between conformance control and thermal recovery made more oil recovered, which was intuitively clarified in the mechanism analysis.

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Zhao, Lisha, Xin Li, Shuhong Wu, Zhongbao Wu, and Min Tong. "Method for Calculating Productivity of Water Imbibition Based on Volume Fracturing Stimulations of Low Permeability Reservoirs." Geofluids 2021 (February 27, 2021): 1–12. http://dx.doi.org/10.1155/2021/6693359.

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Spontaneous water imbibition is an important mechanism in water-wet fractured reservoirs. For volume-fractured reservoirs, to evaluate the oil productivity and oil recovery through water counter-current imbibition, we propose an analytical method for optimizing the reservoir volume fracturing scheme. Based on the two-phase fluid flow differential equation for capillary force, a three-dimensional water imbibition productivity equation is derived analytically. The equation for the water imbibition productivity considering the fracture network is obtained. A numerical model is constructed to verify the validity of the average capillary diffusivity coefficient and the results of the analytical model. By applying this method to a low permeability reservoir, after volume fracturing and waterflooding huff and puff, the relationship between the tenth year’s oil recovery and oil production rate and the length, width, and density of the fracture network is predicted, which gives an optimization of the field fracturing construction scale. The results show that the length and width of the fracture network should be no less than 50% of the well spacing and row spacing to obtain a reasonable production. Considering the fracturing technique and economic feasibility, the higher the density of the fracture network, the better the production obtained. Through hydraulic volume fracturing and waterflooding huff and puff, water imbibition is brought into full play and the 10 year oil recovery is increased by 6%–8% in this area.

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Krama, Agel Vidian, and Nurul Qamilah. "Model Spasial Regionisasi dan Rujukan Fasilitas Kesehatan." KESMARS: Jurnal Kesehatan Masyarakat, Manajemen dan Administrasi Rumah Sakit 1, no. 1 (2018): 78–86. http://dx.doi.org/10.31539/kesmars.v1i1.191.

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Location Hospital and Health Center in Bandar Lampung and the District Pesawaran not currently mapped by conventional or digital. And there is no data base that provides information about the location and distribution of hospitals and health centers in Bandar Lampung City, and the uneven number of health facilities to ensure the availability of health services for all citizens, by optimizing existing health care facilities. Contributions utilization of spatial studies in the health field is used for mapping and modeling of health in order to facilitate access, provision of efficiency and planning of health services in order to take policy related to determining the location of health facilities. The research method uses spatial model approach with descriptive research type and analysis through the use of Huff Model. The results of the regionization shows the coverage area of hospital services serving 33 points in the District Pesawaran and 24 point Population in Bandar Lampung with the spread of regionization is divided into 3 regions. Keywords: Health Service, Regionalization

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Yoo, Chulsang, and Wooyoung Na. "Analysis of a Conventional Huff Model at Seoul Station and Proposal of an Improvisation Method." Journal of the Korean Society of Hazard Mitigation 19, no. 2 (2019): 43–55. http://dx.doi.org/10.9798/kosham.2019.19.2.43.

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Fernández, José, Blas Pelegrı´n, Frank Plastria, and Boglárka Tóth. "Solving a Huff-like competitive location and design model for profit maximization in the plane." European Journal of Operational Research 179, no. 3 (2007): 1274–87. http://dx.doi.org/10.1016/j.ejor.2006.02.005.

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Klaas, Zachary. "Varying the Variable." International Journal of Applied Geospatial Research 1, no. 4 (2010): 16–31. http://dx.doi.org/10.4018/jagr.2010100102.

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It is common practice in business geography to use gravity models such as the Reilly’s Retail Law of Gravitation model to gauge the extent of presumed trade areas for retail sites based on a variable that models the general demographic attractiveness of the site in question. In the Huff retail model, an exponent represents additional attractiveness factors that differentially affect certain sites; however, it is less common practice to vary the attractiveness of one site alone and to visually inspect in a series of maps the differences in other trade areas given the variation of assumptions about the attractiveness of that site. The idea behind this form of analysis is that business managers benefit from being able to visualize a range of possible contingencies to which they may have to respond. The city of New Britain, Connecticut, is used as a demonstration model in this article to provide these kinds of visualization maps.

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Lu, Shiwei, Shih-Lung Shaw, Zhixiang Fang, Xirui Zhang, and Ling Yin. "Exploring the Effects of Sampling Locations for Calibrating the Huff Model Using Mobile Phone Location Data." Sustainability 9, no. 1 (2017): 159. http://dx.doi.org/10.3390/su9010159.

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Mitrikova, Jana, and Sandra Antolikova. "Calculation of shopping probability by the Huff model in selected retail stores of Kosice (Slovak Republic)." Economic Annals-ХХI 159, no. 5-6 (2016): 63–66. http://dx.doi.org/10.21003/ea.v159-13.

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Luo, Jun. "Integrating the Huff Model and Floating Catchment Area Methods to Analyze Spatial Access to Healthcare Services." Transactions in GIS 18, no. 3 (2014): 436–48. http://dx.doi.org/10.1111/tgis.12096.

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김은정, 김지훈, 강정은, and 김동원. "Assessment of Urban Park Service Provision Using Huff Model: Focused on Mapo-gu, Seoul Metropolitan City." Korea Spatial Planning Review 90, no. ll (2016): 71–83. http://dx.doi.org/10.15793/kspr.2016.90..005.

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Fernández, Pascual, Blas Pelegrín, Algirdas Lančinskas, and Julius Žilinskas. "Exact and heuristic solutions of a discrete competitive location model with Pareto-Huff customer choice rule." Journal of Computational and Applied Mathematics 385 (March 2021): 113200. http://dx.doi.org/10.1016/j.cam.2020.113200.

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Li, Ju Hua, Rong Bao, Bin Qin, and Tao Jiang. "Numerical Simulation of Foamy Oil Stability Using Natural Gas Huff and Puff for Ultra-Deep Heavy Oil Reservoir." Applied Mechanics and Materials 318 (May 2013): 405–9. http://dx.doi.org/10.4028/www.scientific.net/amm.318.405.

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The nature of injected gas dispersion in oil distinguishes foamy oil behavior from conventional heavy oil behavior. Unlike normal two-phase flow, it involves flow of dispersed gas bubbles with pseudo single phase. This paper presents the results of a numerical simulation study of the stability of foamy oil created by liberation of dissolved gas during natural gas huff and puff process. Through the history matching of labs test conducted by three series of various core tubes in numerical simulation, foamy oil impactions on recovery were discussed based on vertical heterogeneous model. The effects on the stability of foamy oil flow behavior were investigated by mobility ratio, viscous to gravity ratio, layer permeability contrast, vertical to horizontal permeability ratio and the transverse dispersion number in the paper. The results show that foamy oil stability increases with higher oil viscosity, higher injection gas density. The oil recovery decrease with the mobility ratio and the layer permeability contrast, while the oil recovery increase with the vertical to horizontal permeability ratio. This work demonstrates that the transverse dispersion number should be used to assess vertical or microscopic sweep efficiency. The study indicates that foamy oil in porous media during production is unstable, but it will be huge potentials to apply natural gas huff and puff for ultra-deep heavy oil reservoirs.

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Di, Shiying, Shiqing Cheng, Cao Wei, et al. "Study on the Production Mode of Horizontal Well from Water Huff and Puff to Segmented Injection and Production in Tight Reservoir." Geofluids 2021 (June 8, 2021): 1–10. http://dx.doi.org/10.1155/2021/7947911.

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Water huff and puff in horizontal wells in tight reservoirs has achieved good results in replenishing formation energy. However, after multiple rounds of treatment, a rapid decrease in formation pressure takes place making it difficult to maintain stable production. To improve the oil recovery rate of tight reservoirs, it is imminent to change the development mode. In this work, the stress distribution characteristics at fracture tips were analyzed based on Irwin theory and elastic theory. A model of propagation and closure length of fractures was established based on the propagation mechanism of water injection-induced natural fracture and the energy balance principle of fracture mechanics. Surfactant imbibition experiments were carried out according to the imbibition principle of surfactant system, and the propagation law of natural fractures was described with numerical simulation to analyze the seepage characteristics of dynamic fracture network. On the basis of the above works, alternating water huff and puff into segmented injection and production was proposed according to the distribution law of dynamic fracture network. The developing process of an actual well case by these two developing modes was simulated to predict 18 years of cumulative recovery, pressure distribution, and recovery rate. Results showed that when stress intensity factor exceeds the fracture toughness, the natural fractures will extend along their original directions and get connected, forming an irregular fracture network. The lengths of fractures after propagation and closure will not bring about water channeling for they are far shorter than well and interval spacing. Surfactant could diminish the resistance of boundary layer by reducing the wetting contact angle, ending up with an improvement in imbibition efficiency. Radial displacement and dynamic imbibition occur simultaneously in a dynamic fracture network during the early stage of water injection, while static imbibition mainly occurs during injection shutdown period and well soaking. According to comparison, the swept area of segmented injection and production was larger, ending up with a continuous increase of simulated recovery rate and cumulative recovery. The findings of this study show alternating water huff and puff after to segmented injection and production in fractured tight reservoir can allow full play of dynamic fracture network’s potential and achieve effective enhancement in oil recovery rate.

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