Relevant bibliographies by topics / Unconsolidated white sands

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Academic literature on the topic 'Unconsolidated white sands'

Author: Grafiati
Published: 5 June 2025
Last updated: 2 August 2025

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Journal articles on the topic "Unconsolidated white sands"

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De, Block Petra, Franck Rakotonasolo, Alexander Vrijdaghs, and Steven Dessein. "Two new species of Phialiphora (Spermacoceae, Rubiaceae) exemplify drought adaptations in western Madagascar." Plant Ecology and Evolution 153, no. (2) (2020): 267–82. https://doi.org/10.5091/plecevo.2020.1675.

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<b>Background</b> – <em>Phialiphora</em> (Spermacoceae, Rubiaceae) is a herbaceous genus restricted to unconsolidated white sands in open spaces in dry forests in northwestern Madagascar. The genus is characterized by the semi-succulent nature of its leaves and stems, its basal leaf rosette, its head-like inflorescences subtended by large leaf-like involucrate bracts and its isostylous flowers. Hitherto, only two species were described.<b>Methods</b> – Classical methods of herbarium taxonomy are followed.<b>Key results</b> – Two new <em>Phialiphora</em> species, <em>P. glabrata</em> De Block a
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De Block, Petra, Franck Rakotonasolo, Alexander Vrijdaghs, and Steven Dessein. "Two new species of Phialiphora (Spermacoceae, Rubiaceae) exemplify drought adaptations in western Madagascar." Plant Ecology and Evolution 153, no. 2 (2020): 267–82. http://dx.doi.org/10.5091/plecevo.2020.1675.

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Background – Phialiphora (Spermacoceae, Rubiaceae) is a herbaceous genus restricted to unconsolidated white sands in open spaces in dry forests in northwestern Madagascar. The genus is characterized by the semi-succulent nature of its leaves and stems, its basal leaf rosette, its head-like inflorescences subtended by large leaf-like involucrate bracts and its isostylous flowers. Hitherto, only two species were described.Methods – Classical methods of herbarium taxonomy are followed.Key results – Two new Phialiphora species, P. glabrata De Block and P. valida De Block, are described, which brin
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Miller, Mark A., and H. J. Ramey. "Effect of Temperature on Oil/Water Relative Permeabilities of Unconsolidated and Consolidated Sands." Society of Petroleum Engineers Journal 25, no. 06 (1985): 945–53. http://dx.doi.org/10.2118/12116-pa.

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Abstract Over the past 20 years, a number of studies have reported temperature effects on two-phase relative permeabilities in porous media. Some of the reported results, however, have been contradictory. Also, observed effects have not been explained in terms of fundamental properties known to govern two-phase flow. The purpose of this study was to attempt to isolate the fundamental properties affecting two-phase relative permeabilities at elevated temperatures. Laboratory dynamic-displacement relative permeability measurements were made on unconsolidated and consolidated sand cores with wate
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Aladejana, Jamiu A., Robert M. Kalin, Philippe Sentenac, and Ibrahim Hassan. "Hydrostratigraphic Characterisation of Shallow Coastal Aquifers of Eastern Dahomey Basin, S/W Nigeria, Using Integrated Hydrogeophysical Approach; Implication for Saltwater Intrusion." Geosciences 10, no. 2 (2020): 65. http://dx.doi.org/10.3390/geosciences10020065.

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This study employed electrical resistivity tomography (ERT) in characterising the shallow groundwater aquifers of Eastern Dahomey basin in southwestern Nigeria to assess the possible occurrence and distribution of saltwater within the aquifers. Electrical resistivity tomography (ERT), induced polarization (IP) and borehole logging were carried in locations with relatively enhanced electrical conductivity (EC) within the coastal zone of the basin through 97 groundwater samples from shallow wells and boreholes; 500 m-length ERT and IP sections were carried out along three traverses A–B, C–D and
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Hornby, Brian E., and William F. Murphy. "Vp/Vs in unconsolidated oil sands: Shear from Stoneley." GEOPHYSICS 52, no. 4 (1987): 502–13. http://dx.doi.org/10.1190/1.1442320.

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The SDT-A sonic tool was tested in a borehole in the Orinoco heavy oil belt, eastern Venezuela. The sonically slow reservoir consists of unconsolidated quartz sand interbedded with shale. Full‐waveform analysis yields both compressional and shear slownesses. We calculated the shear‐wave slowness from the Stoneley slowness; compressional and Stoneley slownesses were determined using modified semblance techniques. The compressional velocity is relatively fast in the heavy oil pay zone compared to the remainder of the well. Heavy oil (8 API) possesses a finite rigidity at sonic frequencies, and t
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Wang, Jiaxian, Yunkai Ji, Changling Liu, et al. "Pore Water Conversion Characteristics during Methane Hydrate Formation: Insights from Low-Field Nuclear Magnetic Resonance (NMR) Measurements." Journal of Marine Science and Engineering 12, no. 4 (2024): 619. http://dx.doi.org/10.3390/jmse12040619.

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Understanding the conversion characteristics of pore water is crucial for investigating the mechanism of hydrate accumulation; however, research in this area remains limited. This study conducted methane hydrate formation experiments in unconsolidated sands using an in-house low-field nuclear magnetic resonance (NMR) system. It focused on pore water conversion characteristics and influencing factors such as initial water saturation and sand particle sizes. Results show that methane hydrate formation enhances the homogeneity of the effective pore structure within sand samples. The conversion ra
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Hagin, Paul N., and Mark D. Zoback. "Viscous deformation of unconsolidated reservoir sands—Part 2: Linear viscoelastic models." GEOPHYSICS 69, no. 3 (2004): 742–51. http://dx.doi.org/10.1190/1.1759460.

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Laboratory creep experiments show that dry unconsolidated reservoir sands follow a power law function of time (at constant stress), and cyclic loading tests (at quasi‐static frequencies of 10−6 to 10−2 Hz) show that the bulk modulus increases by a factor of two with increasing frequency while attenuation remains constant. In this paper, we attempt to model these observations using linear viscoelasticity theory by considering several simple phenomenological models. We investigated two classes of models: spring‐dashpot models, which are represented by exponential functions with a single relaxati
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Neidell, Norman S., and Neal Berry. "Documenting the sand/shale crossover." GEOPHYSICS 54, no. 11 (1989): 1430–34. http://dx.doi.org/10.1190/1.1442606.

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All types of velocity data, i.e., surface seismic and well log or sonic log data, indicate that velocity in shallow, unconsolidated sands is lower than in associated shales, while velocity in older sands in more consolidated rock sequences is higher than in their associated shales. As the low‐velocity sands compact to become the high‐velocity member in the sand‐shale sequence, sand and shale velocities must become equal or crossover at some age and depth of burial. If the same type of velocity data is used consistently, this crossover occurs at the same depth and age of rocks in the geologic s
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Namdie, Inyang, Idara Akpabio, and Agbasi Okechukwu .E. "Shale volume and permeability of the Miocene unconsolidated turbidite sands of Bonga oil field, Niger delta, Nigeria." International Journal of Advanced Geosciences 5, no. 1 (2017): 37. http://dx.doi.org/10.14419/ijag.v5i1.7586.

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Bonga oil field is located 120km (75mi) southeast of the Niger Delta, Nigeria. It is a subsea type development located about 3500ft water depth and has produced over 330 mmstb of hydrocarbon till date with over 16 oil producing and water injection wells. The producing formation is the Middle to Late Miocene unconsolidated turbidite sandstones with lateral and vertical homogeneities in reservoir properties. This work, analysis the petrophysical properties of the reservoir units for the purpose of modeling the effect of shale content on permeability in the reservoir. Turbidite sandstones are ide
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Ghislain Berlin Viban, Ali Gürel, and Honorine Nug. "Facies and depositional sequences of Melendiz Confluence Holocene sediments, Central Anatolia, Turkey." International Journal of Science and Research Archive 12, no. 1 (2024): 2287–307. http://dx.doi.org/10.30574/ijsra.2024.12.1.1013.

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The aim of this article is to investigate the Çiftlik Plain and the Central Anatolia Cappadocia Volcanic Province, the unexplored Quaternary fills, and their climate records. This studies has gained importance as it completes a deficiency in the region.A confluence is where a tributary joins a larger river which depicts an important area of deposition which is an essential geomorphological node that controls the downstream routing of flow and (P2), located between latitudes N38°11' and longitudes E34°27', at an altitude of 1532m above sea level in the Çiftlik Basin. In this Confluence in Çiftl
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Conference papers on the topic "Unconsolidated white sands"

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Author, A. O., M. S. Author, N. F. Author, N. L. Author, and O. C. Author. "A Deep Dive on Stage Cementing Operations in Sub-Saharan Africa: A Case Study." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/221578-ms.

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Abstract Cementing through weak sand and unconsolidated formations are a common occurrence in today's drilling operations. Main challenges include well control, poor zonal isolation, failed top of cement objectives that could lead to a shortened lifespan of wells. From annular gas migration through micro annulus to getting the top of cement to an undesired depth below referenced hydrocarbon sands, cementing through unconsolidated formations can lead to an increase in the cost of delivering a well. There are different methods deployed in cementing through unconsolidated zones. Stage cementing i
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Zheng, Xuelin, Mingjing Lu, Dongying Wang, et al. "Investigation on the Damage Mechanisms of Unconsolidated Sand, Tight Sand and Shale Induced by Cryogenic Temperature." In 58th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2024. http://dx.doi.org/10.56952/arma-2024-0350.

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ABSTRACT: Liquid nitrogen (LN) fracturing is a new approach that utilizes the LN cryogenic temperature to induce complex fracture networks in tight reservoirs. Under the cryogenic treatment of LN, the damage and fracture characteristics of different lithologies such as shale, tight sand, and unconsolidated sand are different, and there are currently few scholars conducting relevant research. This article innovatively designed a visualization experimental method for the continuous propagation of fractures induced by cryogenic LN. Based on digital image correlation (DIC) methods, it explored the
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AL-Rashidi, Hamad, Mahmoud Reda Aly Hussein Hussein, Abdulaziz Erhamah, et al. "Mitigating Water Production from High Viscosity Oil Wells in Unconsolidated Sandstone Formations." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206333-ms.

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Abstract Large reserves of High-Viscous Oil in Kuwait calls for Improved Oil Recovery scenarios. In Kuwait unconsolidated sandstone formations, the sandstone intervals represent extensive reservoir intervals of sand separated by laterally extensive non-reservoir intervals that comprise finer-grained, argillaceous sands, silts and muds. The reservoir is shallow with high permeability (above 1000 mD) and under bottom aquifer pressure support. Due to strong viscosity contrast between oil and water, after breakthrough, the water cut rises quickly resulting in strong loss of production efficiency.
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Tokoh, K. W., R. Jatikusuma, D. N. Manalu, P. Yudis, and C. Li. "World Longest 7 in Single Trip for Multizones High Rate Water Pack Enhances Completion Strategy in Offshore Indonesia." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216930-ms.

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Abstract Multizones Single Trip Gravel Pack (MZ-STGP) completion has been mainly utilized in Mahakam field in Indonesia since 2012 to present. The system has been used as a sand control solution for its cost efficiency, the ability to complete multiple pay zones in a single trip and to provide zonal isolation for production selectivity for typical unconsolidated sands, poor sorting, and uniformity coefficient as well as very high fine content. The cost escalates when this requirement happens for multiple zones that may require multi run which needs longer rig time. As of now, few of completion
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Wales, Benny Richard, Triadi Herwasto Aribowo, Daru Mulyo Hartanto, Kurnia Darmawan, Heru Putranto, and Julianta Panjaitan. "Exceptional Length of Coring Recovery in a Very Loose Sand or Unconsolidated Formation in South Natuna Sea Block B at 8-1/2" Hole Section with a Conventional Full Closure System." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215360-ms.

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Abstract The South Natuna Sea Block B field is located in the waters of the Riau Archipelago and is a large and fragmented PSC that covers a number of oil and gas fields in the Natuna Sea, of which a few are currently operated by Medco E&amp;P Natuna Ltd. Coring Service is one of the processes that is required by Medco E&amp;P Natuna Ltd. for unconsolidated formations as the target reservoir zone. Unconsolidated formation is very challenging to core, especially with the standard conventional system, as the core could slide and slip off from the inner barrel assembly of the Standard Conventiona
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Zhang, W., Z. Rao, C. Deng, et al. "Practical Guide to Successful Application of Using 6.75 Inch Slim Fluid Sampling While Drilling Tool Across the Large 12.25 Inch Wellbore." In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23985-ea.

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Abstract The objective of this paper is presenting and highlighting the application of the successful 6.75 inch reservoir Fluid Sampling While Drilling (FSWD) technology in a very challenging well condition: 12.25 inch borehole, S-shaped well trajectory, and unconsolidated sand reservoir. The available FSWD tools are 6.75 inch outer diameter developed for 8.5 inch wellbore. Through reasonable tool design and operation process, the 6.75 inch FSWD technology was performed successfully at this 12.25 inch borehole challenging condition and achieved perfect results. Development Well A was drilled i
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Setiadi, Rahman, Abdel Mohammad Deghati, Adnan Syarafi Ashfahani, et al. "Big Entrance Hole Perforation as New Alternative Approach to Optimize Thru-Tubing Sand Control Technique While Maintaining Reservoir Deliverability for Tunu Gas Reservoir in Unconsolidated Sand Formation." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205757-ms.

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Abstract Mahakam block with one of its gas fields, Tunu, has been developed for decades. Hundreds of wells were drilled to unlock layered sand reservoirs ranging from unconsolidated to consolidated reservoirs. Through field experience, well architecture is actively developing. The latest architecture, targeting shallow reservoirs only, is called Shallow Light Architecture (SLA). The well is completed with 3.5in production tubing cemented inside a 8.5in open-hole reservoir section. SLA is the default architecture for chemical sand consolidation (SCON) or thru-tubing screens as subsurface sand c
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Setiadi, Rahman, Erlangga Surya Dharma, Steven Richard Jackson, et al. "Improved Screen Installation Method by Pseudo-Straddled Ceramic Screen Towards Light and Robust Thru Tubing Sand Control Technique in Competitive Edge of Mature Gas Field Mahakam." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31462-ms.

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Abstract Mahakam block has supported Indonesia's Oil and Gas production with over 40 years of deliverability. Presently, along with its maturity cycle, comes the challenge of a steeply declining matured field with indicators of marginal reserves, included unconsolidated sand reservoirs as one of the main contributors which required sand control. In addition, future offshore platform development emerged the urgency of light deployment and robust sand control. Deep dive into the methodology, it was mandatorily to revisit what techniques available on the shelves and what is the current technology
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Vo, Nghia Tri, Roland Hermann, and Roberto Fuenmayor. "Unlocking Production Potential through Sand Management What–If Analysis in Digital Fields." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205766-ms.

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Abstract Sand production associated with oil and gas producers is one of the oldest problems in the industry and is typically in unconsolidated sandstone formations. The stresses caused by the fluids flowing into the wellbore are often sufficient to produce fine sand particles. Sand production may cause operational problems such as disposal of produced sand, sand erosion of downhole and surface equipment, and loss of primary containment (LOPC), which is the most important reason for controlling sand production. In actual field operation, a sand management program is usually implemented to mana
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Khaksar, A., A. Younessi, A. Chatterjee, I. H. Ghazali, and N. F. Nordin. "Sanding Assessment and Sand Control Options for a High Fine Content Unconsolidated Sandstone Reservoir, Offshore Malaysia." In APOGCE 2024. SPE, 2024. http://dx.doi.org/10.2118/221170-ms.

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Abstract The target formations in the study area are high porosity, poorly consolidated gas bearing reservoirs at a depth 600-650m TVD SS. The reservoirs are fine grained sandstones with a d10 of ∼110 micron and a fines content of ∼77%. The field has been on production since 2012. All wells have been completed cased and perforated completed with active sand control consisting of gauge 6 wirewraped sand screens and 40/60 gravel. While early production wells are still producing solids-free, some of wells drilled in recent years show solids production in the form of fines with d10 of collected so
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Reports on the topic "Unconsolidated white sands"

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Keller, Stephen, and Alexander Marr. OF-22-08 Geologic Map of the Windsor Quadrangle, Larimer and Weld Counties, Colorado. Colorado Geological Survey, 2024. https://doi.org/10.58783/cgs.of2208.lfhf7370.

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The Windsor quadrangle, situated in the northern part of the Colorado Piedmont, features relatively low topographic relief with a 94-meter variance between its highest and lowest points. Notable elongated outcrop areas of weathered bedrock are observed along the dissected southwest side of the Cache la Poudre River valley. While fresh bedrock is mainly found in lower gravel pit faces in the Big Thompson River valley, unconsolidated Quaternary deposits cover most of the quadrangle with few natural exposures along river cut banks. The landscape is primarily characterized by a broad upland swath
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