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Journal articles on the topic 'Oil leakage'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Bolonny, V. T. "ESTIMATION OF THE VALUE OF OIL LOSS DURING THE SEALING OF THE LINEAR PART OF THE PIPELINE." PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY Number, no. 1(59) (January 28, 2021): 142–50. http://dx.doi.org/10.31471/2304-7399-2020-1(59)-142-150.

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The characteristics of the oil transportation system of Ukraine are presented, the emergency risks of domestic oil transportation pipeline systems are established. The analysis of the accident rate of oil pipeline transport in Ukraine was carried out. The technique for estimating emergency oil leakages in the main pipeline depending on the energy characteristics of the fluid flow and changes in its level in the cross section is developed allowing to determine the volume of oil leakages into the environment from the detection of pressure drop to the establishment of stationary conditions of the pipeline operation and its final stop for the purpose of carrying out repairs. Based on the results of the calculations, the graphs which demonstrate the nature of the formation of soil pollution area by leakage from the pipeline are constructed. The linear part of the main oil pipelines is the most dangerous object, as all emergency situations are associated with emergency processes of different intensity in the form of oil leakage into the environment and in fact are dangerous when system failures appear. The process and the time period for the formation of the ecological danger zone depend on the amount of oil leakage, its intensity. Emergency leakages of oil and petroleum products from pipelines enter the environment, which is often the soil, forming an area of gassiness, and then reach the surface, polluting the atmosphere.

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2

Li, Yuhan, Minxia Li, Yusheng Hu, Jia Xu, and Liping Ren. "Researches on leakage with lubricating oil using a composite multiphase lattice Boltzmann method." Thermal Science, no. 00 (2021): 135. http://dx.doi.org/10.2298/tsci200605135l.

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In this paper, a novel model to investigate leakage of gaseous working fluid in pressured devices with lubricating oil was created with Lattice Boltzmann method and Shan-Chen multiphase model. A method to adapt actual pressure-density relation into the lattice via a self-adapting timestep and simplify the simulation of compressible fluid was developed. A model to simulate two-phased leakage with lubricating oil was created with a combination of Shan-Chen model and passive scalar model. The model can realize the phase distribution simulation in the leakage field without causing the pressure and the inter-phase interactions to overlap. This model is also able to be combined with other multiphase models. After a group of preliminary tests of the model, the characteristics of phase distribution and leakage were investigated qualitatively. Five types of phase distribution in the simulation results were classified, which are: uniformed distribution, sphered drips, gas channel, blocked channel and slug bubbles. The results of simulations show good conformance with actual leakage patterns. Preliminary discussions about the leakage features are made upon the results. However, these simulation results are only qualitative and cannot show the quantitative features in leakages. More experimental investigations should be carried out to realize correlations to the model.

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3

Xin, D., J. Feng, X. Jia, and X. Peng. "An investigation into oil—gas two-phase leakage flow through micro gaps in oil-injected compressors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 4 (2010): 925–33. http://dx.doi.org/10.1243/09544062jmes1704.

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This article presents the investigation on the oil—gas two-phase leakage flow through the micro gaps in oil-injected compressors and provides a new way of investigating the internal leakage process in the compressors. The oil—gas leakage rates were measured through the micro gaps of various gap sizes, the volume ratios of oil to gas, and pressure differences/ratios; and the flow patterns reflecting the flow characteristics were observed by using a high-speed video. The experimental results showed that the leakage flowrate was significantly related to the flow patterns in the gap, which were similar to those found in the existing literature and agreed well with the predicted ones by the Weber number. The gas leakage flowrate through the gap increased rapidly with the increased pressure ratio until the pressure ratio reached the critical pressure ratio, which ranged from 1.8 to 2.7. At the critical pressure ratio, the flow pattern transition from churn flow to annular flow occurred, resulting in gas leakage driven by a different sealing mechanism. As the volume ratio of oil to gas increased by 0.5 per cent, the gas leakage flowrate decreased by 77 per cent.

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4

Wang, Zegen, Kexia Li, and Mingjun Xi. "Spatial Analysis of Leakage Accidents of Oil Pipeline River Crossing Sections." Open Civil Engineering Journal 10, no. 1 (2016): 836–46. http://dx.doi.org/10.2174/1874149501610010836.

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Oil pipeline leakages often bring catastrophic impacts on rivers along the pipeline, drinking water sources, and farm land irrigation etc. Based on the distinct spatial-temporal attributes in the analysis of oil spill, diffusion and consequences thereof, we present the theoretical concept and reasoning for leakage accidents spatial analysis through combining GIS and accident aftermath model. Specifically, we aim to achieve quantitative analysis and visualization of oil spill accidents through several GIS functions, which include buffer analysis, overlay analysis, spatial statistical analysis and visualized analysis. Taking a specific leakage accident of oil pipeline river-crossing section as an example, we have analyzed the polluted areas under different diffusion time and the hydrological conditions. In addition, we have evaluated populations and farm land areas affected in terms of drinking water and irrigation as well as their spatial distributions. The results demonstrate that our method can achieve quantitative analysis and visualized representations of oil spills to support policy-makers in making contingency plans.

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5

Kranenburg, C., and E. Vegt. "Leakage from Ruptured Submarine Oil Pipeline." Journal of Transportation Engineering 111, no. 5 (1985): 570–81. http://dx.doi.org/10.1061/(asce)0733-947x(1985)111:5(570).

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6

Lemaitre, Stephanie, Kaveh Vahdani, Pierre Escalas, and Geoffrey E. Rose. "Orbital Leakage of Intraocular Silicone Oil." Ophthalmic Plastic and Reconstructive Surgery 36, no. 3 (2020): e75-e78. http://dx.doi.org/10.1097/iop.0000000000001588.

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7

Rong, Li, Chen Lunjun, Su Ming, Zeng Qi, and Liu Yong. "Study on Friction and Wear Characteristics of Aluminum Alloy Hydraulic Valve Body and Its Antiwear Mechanism." Archives of Foundry Engineering 17, no. 1 (2017): 207–15. http://dx.doi.org/10.1515/afe-2017-0037.

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Abstract In order for the working status of the aluminum alloyed hydraulic valve body to be controlled in actual conditions, a new friction and wear design device was designed for the cast iron and aluminum alloyed valve bodies comparison under the same conditions. The results displayed that: (1) The oil leakage of the aluminum alloyed hydraulic valve body was higher than the corresponding oil leakage of the iron body during the initial running stage. Besides during a later running stage, the oil leakage of the aluminum alloyed body was lower than corresponding oil leakage of the iron body; (2) The actual oil leakage of different materials consisted of two parts: the foundation leakage that was the leakage of the valve without wear and wear leakage that was caused by the worn valve body; (3) The aluminum alloyed valve could rely on the dust filling furrow and melting mechanism that led the body surface to retain dynamic balance, resulting in the valve leakage preservation at a low level. The aluminum alloy modified valve body can meet the requirements of hydraulic leakage under pressure, possibly constituting this alloy suitable for hydraulic valve body manufacturing.

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8

Inaguma, Yoshiharu. "A practical approach for analysis of leakage flow characteristics in hydraulic pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 5 (2012): 980–91. http://dx.doi.org/10.1177/0954406212456933.

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This article presents a practical approach to leakage flow analysing for various types of hydraulic pumps. In this study, the influence of pump-operating conditions such as operating pressures, pump speeds and oil temperature on the leakage flow characteristics is investigated and a mathematical model to calculate the leakage flow is proposed. Currently, an external gear, an internal gear or a vane pump is commonly used for an automatic transmission. These pumps have their own leakage flow characteristics, which depend not only on pump-operating conditions but also on structures and dimensions of the pumps. For various pumps having different constructions, the delivery pressure and the oil temperature differently affect the leakage flow characteristics and especially the delivery pressure also changes the clearances causing the leakage flow. A mathematical model for the leakage flow, which takes into account a change in the thickness of clearance according to the delivery pressure, represents accurately the actual leakage flow characteristics in various pumps. Also, it clarifies the influence of the pump-operating conditions on their leakage flow characteristics. In the external and internal gear pumps, the leakage flow would not approach zero due to an existence of the orifice flow leakage almost independent of the viscosity of oil, even at an extremely low oil temperature. This leakage flow influences significantly the volumetric efficiency at a low oil temperature in the gear pumps.

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9

Kim, Choi, Park, He, and Oh. "Oil Leakage Evaluation for Selection of Emulsion-Based Non-Curable Synthetic Polymer Rubberized Gel (ENC-SPRG) as Waterproofing Material in Underground Structures." Materials 12, no. 23 (2019): 3816. http://dx.doi.org/10.3390/ma12233816.

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A revised oil leakage evaluation regime is proposed in response to the oil leakage problems of emulsion-based non-curable synthetic polymer rubberized gel (ENC-SPRG) used as a waterproofing material in concrete slabs of residential underground structures. Oil leakage from ENC-SPRG can cause significant economic and environmental damage. As ENC-SPRG waterproofing material is relatively new in the global waterproofing market, a systematic quality control for ENC-SPRG products being manufactured and exported globally is currently non-existent. For the selection of optimal ENC-SPRG, six assessment parameters comprised of averaged and daily average oil leakage mass, averaged and daily average filler content settlement, oil leakage area, and oil leakage duration are proposed. Five ENC-SPRG product specimens are tested to obtain the property values of each parameter. The property values derived from the test results are compared between the tested ENC-SPRG product specimens. With the demonstration of this evaluation regime, a quantified method for a comparative assessment of ENC-SPRG type waterproofing materials is established.

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10

Qi, Han Bing, Yang Liu, Guo Zhong Wu, Dong Li, and Jie Liu. "Numerical Simulation of Multiphase Flow Pollutants during Migration Process in Buried Oil Pipeline Leakage." Applied Mechanics and Materials 675-677 (October 2014): 359–62. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.359.

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Considered influence of buried pipeline leakage of crude oil pollutants multiphase flow migration phenomenon effects, numerical model was established to buried pipeline road multiphase leak process simplified for two-dimension problem, numerical simulation was used with the CFD software FLUENT on buried pipeline leakage of crude oil pollutants migration process caused pollution problem, calculation simulation was carried out in the two species workers condition of one phase flow and multiphase flow buried pipeline leakage of pollutants around earth temperature field, the speed field and the distributions of oil/water phase in the soil porous media. Analysis the comparison of results indicated that: 1) the affected region of temperatures spread above the buried oil pipeline was more slowly than either side of the rate of diffusion;2) During the buried pipeline leakage early, except the maximum of velocity near the leakage mouth, the other penetration regional velocity of leakage crude oil are very low.

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11

Akaiwa, Ryo, and Kakuro Amasaka. "CAE Analysis for Oil Leakage Mechanism of Transaxle Oil Seal." IOSR Journal of Computer Engineering 16, no. 4 (2014): 60–63. http://dx.doi.org/10.9790/0661-16426063.

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12

Wang, Li Wei, Dong Hu, and Xin Hua Wang. "Internal Leakage of the Oil Pipeline Valve by FlOEFD Simulation and Indoor Experiment." Advanced Materials Research 807-809 (September 2013): 2484–87. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.2484.

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Based on the FLOEFD analysis and the indoor experiment tests, the characteristic of valve internal leakage under different transfer pressure have been studied. It is found that the oil which leaked from the center of the hole has the highest velocity and after leakage, the oil velocity first increased and then decreased. The leakage velocity peak value increased with the increase of the transfer pressure and decrease of leakage area. The mass flow of the oil leaked through the smallest hole is the smallest and it increased with the increase of the transfer pressure.

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13

Liu, Wen Xue, Zhao Hua Zhi, and Gen Li Shan. "The Study on Oil Pipeline Leakage Control Device." Advanced Materials Research 211-212 (February 2011): 325–29. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.325.

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In terms of the characteristics of the oil pipeline leaks, A kind of leak control equipment was developed in which the remote control walking system, the facilities to find and locate pipe and the institutions of oil leakage recovery were designed, the explosion proof problem was solved also. The equipment can effectively raise the maintainability speed of oil pipeline leakiness, reduce an oil product pollution of leakiness to environment, lower the worker's risk and minimize the loss of the oil product leakiness.

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14

Nakashima, Toshiro, Hajime Nakajima, and Osamu Matoba. "Oil Leakage Detection System for Plant Inspection." Japanese Journal of Applied Physics 48, no. 9 (2009): 09LD05. http://dx.doi.org/10.1143/jjap.48.09ld05.

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15

Wu, Guo Zhong, Yu Wang, Han Bing Qi, Ying Ming Zhou, and Dong Li. "The Analysis of Crude Oil Nature’s Impact on Oil Pipeline Underground Divulging Pollutant Migration." Applied Mechanics and Materials 675-677 (October 2014): 332–35. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.332.

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The oil pipeline burying divulging pollutant was taken as the object of study in this paper, the heat transfer and mass transfer process of which in the soil porous medium were carried by the numerical analysis. The oil phase change for multiphase flow leakage process for buried pipelines for oil, gas and water in the low temperature was considered, and the impact on multiphase leakage process of high and low viscosity of the oil phase viscosity properties was analyzed. It cited multiphase pipeline leak by using Fluent at different times during the course of the earth temperature field , the oil / water phase distribution , surface temperature, and the results showed that : there existed a big difference between the multiphase flow leakage process surface temperature changes and porous medium heat and mass transfer processes with the conditions of high viscosity and low viscosity conditions . Therefore, the impact of the physical properties on buried oil pipeline leak process at low temperatures is great.

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16

Yin, Chao, Shao Qiang Liu, Yong Zhou Li, and Xiang Yong Chen. "Wireless Sensor for Oil Leakage Detection of Depots." Applied Mechanics and Materials 336-338 (July 2013): 244–47. http://dx.doi.org/10.4028/www.scientific.net/amm.336-338.244.

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This paper presents a low-power wireless sensor system scheme for monitoring aviation fuel leakage of depots. Based on MSP430 microcontroller and powered by a combination of lithium battery and solar energy, the system employs the photoionization detection (PID) technology to detect the oil leakage and wirelessly reports the detection results by CC2520 radio-frequency communication module. With a low-voltage PID integrated sensor and a specialized active gas-collecting device, the system can effectively measure the concentration of leakage in low power mode. Furthermore, an integrated temperature sensor is used to compensate environmental temperature influence on the PID sensor. The effectiveness analysis and power estimation of the system show that the proposed scheme is suitable for detecting aviation fuel leakage of depots.

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17

Sarmento, Lígia Rafaely Barbosa, B. E. Leite, Severino Rodrigues de Farias Neto, and Antônio Gilson Barbosa de Lima. "Hydrodynamics of Oil-Water with Leakage by CFD." Defect and Diffusion Forum 348 (January 2014): 58–63. http://dx.doi.org/10.4028/www.scientific.net/ddf.348.58.

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The oil industry has sought to minimize the environmental impact from mining activities and oil transportation. The oil transportation by pipeline is subject to failures and leaks that cause financial losses and environmental damage, often irreparable. In this sense, the aim of this study is to evaluate the influence of the leak diameter in the behavior of the two-phase flow (oil and water) in a pipe. A transient and incompressible multiphase flow mathematical model based on the particle model was used here. Oil is the dispersed phase while water is the continuous phase. To model the turbulence effect it was used the standard k-ε model. All simulations were carried out using the Ansys CFX® commercial code. Results of the pressure, velocity and volumetric fraction of the phases are presented and discussed. The results confirm the difficulty to detect leakage with small diameters.

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18

Liu, Fu Jun, Li Wei Zhao, and Yue Qiang Qian. "A Study on Leakage Diffusion of Double-Layer Structure of Oil Storage Tank." Applied Mechanics and Materials 220-223 (November 2012): 487–93. http://dx.doi.org/10.4028/www.scientific.net/amm.220-223.487.

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A double-layer structure of oil storage tank was proposed in this paper to overcome the shortcomings of existing oil storage tanks and its detection method. Using 93# gasoline, diesel and water as working medium, the leakage diffusion characteristic of tank floor was researched based on a experimental system. The research results testify the reliability and sensitivity of the experimental system. Furtherly, the influencing rule of leak positions and leak volume (Q) on the leakage diffusion was studied by using 93# gasoline. The results show that for the same amount of leakage, the leakage on the center of tank floor diffused quickly, was the most easily detected part; and that on the edge of the tank floor was the most difficult to be detected. For leakage occurred in same position, the volume fraction (φ) in pipeline increased with the increase of leakage. The result of research has a great significance for fastening localization of double bottom structure of oil storage tank.

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19

Yang, Jiali, Wei Li, Jiarui Chen, and Li Sheng. "Fault diagnosis of electric submersible pump tubing string leakage." E3S Web of Conferences 245 (2021): 01042. http://dx.doi.org/10.1051/e3sconf/202124501042.

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With the rapid development of the offshore oil industry, electric submersible pumps have become more and more important. They are the main pumping equipment in oil well production and have huge advantages in terms of displacement and production costs. Due to the complex structure of the electric submersible pump, the bad working environment will cause failures. The failure of tubing string leakage is a common failure in oilfields; tubing string leakage of the electric submersible pump will reduce oil production. In order to reduce the economic loss of oil well production. This paper uses PCA and Mahalanobis distance to make the tubing Fault diagnosis of leakage. The feasibility of the algorithm is verified through experiments. The result shows that it can diagnose the failure time of pipe string leakage in advance and hence help us to reduce the maintenance cost of offshore oilfields.

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20

Chu, Xin Jie, Hui Gao, and Song Sen Xu. "Experimental Study on Emergency Reclaiming of Offshore Underwater Leakage Oil." Applied Mechanics and Materials 318 (May 2013): 522–26. http://dx.doi.org/10.4028/www.scientific.net/amm.318.522.

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The offshore leakage oil accidents bring great harm to society, economy and ecology. The paper presents a new technology of reclaiming of offshore underwater leakage oil to achieve the aim of emergency treatment, which can improve the emergency speed to win some valuable time for marine casualty treatment, and meanwhile can reduce environmental pollution loss caused by the leakage oil. Designed two groups of physical model test, the test results show that: The technical principle is feasible in theory, and the flexible collection tank in stress has more advantage than the rigid one. It is very significant to promote marine oil spill emergency response ability, and also lays a solid foundation for further forming series of technology and equipments.

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21

Zhang, Xi, Lei Zhang, and Yu Feng Zhang. "Oil Leak Image Data Analysis Based on Maximum Variance Threshold Method." Applied Mechanics and Materials 687-691 (November 2014): 3564–68. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3564.

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The oil leak is detected by the computer image recognition technique and the oil leak images are processed by the threshold segmentation and semi-thresholding of the maximum variance threshold method. Through capture of fluorescent images of leakage, the oil leak image information is acquired. The maximum variance threshold method is adopted for image data analysis to compute the dilation area of oil images and achieve the detection of leakage.

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22

Sun, Shu Ye, and Guo Yong Zhang. "The Analysis and Treatment to Lube Oil Separator’s Leakage." Advanced Materials Research 328-330 (September 2011): 734–37. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.734.

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The lube oil separator is widely used in lube oil system of merchant vessel. The lube oil separator functions to purify the lube oil to ensure its good working performance. The working condition of the oil separator will greatly influence the normal running of many plants. The lube oil separator used in our laboratory is Mitsubishi SJ700. In the processing of purifying, oil leakage from the water outlet is found. In order to find failure point, the basic structure and the working principle of the separator is introduced. The separator is dismantled according to the procedure. After cleaning some parts found dirty and replacing some sealing elements, the separator is reassembled. When starting the separating process again, the failure remains. Through further analyzing the structure and working principle of the separator, the trouble spot is found out. After removing the failure, the separator finally is repaired. To prevent similar accident occurring again, some suggestions are presented.

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23

Wu, Guo Zhong, En Yue Guo, Han Bing Qi, Ying Ming Zhou, and Dong Li. "The Impact Analysis on Crude Oil Phase Change to the Migration of Buried Oil Pipelines Leakage Pollution." Applied Mechanics and Materials 675-677 (October 2014): 341–44. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.341.

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This paper established mathematic and physic model of buried oil pipelines leaking in porous media of soil. Make use of FLUENT software to simulate crude oil phase change and non-phase change in the soil of cold regions. The result shows that: The temperature over the leakage hole of phase change diffusion process is higher than not considering phase change. The oil phase diffuse to the earth’s surface needs more time. And the speed diffusing to the underground is basically same. The earth surface temperature’s variation of leakage process without crude oil phase change lags behind the process considering phase change.

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24

Miyazaki, Jingo, Hisashi Yoshida, Masaki Nishino, and Minoru Takayasu. "Stern Tube Oil Seal under Backward Leakage Condition." JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN 27, no. 1 (1992): 44–48. http://dx.doi.org/10.5988/jime1966.27.44.

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25

Kochetova, Zh Yu, T. A. Kuchmenko, A. A. Kravchenko, and A. V. Chaliy. "INDOOR PIEZOSORBTION SENSOR LIGHT OIL PRODUCTS LEAKAGE DETECTOR." Problems of Gathering, Treatment and Transportation of Oil and Oil Products, no. 6 (December 2018): 119. http://dx.doi.org/10.17122/ntj-oil-2018-6-119-129.

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26

J. Mohammed., Hassan. "Study Of Measurements Leakage Current In Oil Transformer." Diyala Journal of Engineering Sciences 13, no. 1 (2020): 1–8. http://dx.doi.org/10.24237/djes.2020.13101.

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27

Wilman, Elizabeth A. "Market Redirection Leakage in the Palm Oil Market." Ecological Economics 159 (May 2019): 226–34. http://dx.doi.org/10.1016/j.ecolecon.2019.01.014.

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28

Qin, FanKai, SiTong Chen, Ru Chen, et al. "Leakage detection of oil tank using terahertz spectroscopy." Science China Technological Sciences 64, no. 9 (2021): 1947–52. http://dx.doi.org/10.1007/s11431-021-1884-1.

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29

Song, Jun Yuan, Shu Li, Zhao Li Wang, and Xiang Jun Peng. "Study on Detection and Location of Mobile Oil Pipeline Leakage Based on Pressure Gradient Method." Advanced Materials Research 580 (October 2012): 395–400. http://dx.doi.org/10.4028/www.scientific.net/amr.580.395.

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In the process of monitoring mobile oil pipeline system, it is hard to detect the exact leakage point. In order to solve this problem, a method based on pressure gradient is adopted to improve the accuracy of leakage detection. In the previous researches, the fluid friction resistance coefficient is supposed to be an invariable before and after the leakage of mobile oil pipeline, but the method based on pressure gradient can overcome this limitation and improve the accuracy of locating leakage point. Furthermore, it is indicated that the method is better by comparison with relevant literatures.

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Goszczak, Jarosław, Bartosz Radzymiński, and Grzegorz Mitukiewicz. "Continuously variable transmission leakage test results." Acta Innovations, no. 31 (April 1, 2019): 5–13. http://dx.doi.org/10.32933/actainnovations.31.1.

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After a short introduction characterizing the general outline of the issue, this paper describes the test results of oil leakage measurements through CVT actuator seals. The research was done using Jatco company's CVT 7 model, the popular gearbox for small passenger cars. Several curves of leakage values are given for both actuators, concerning different conditions such as rotational speed, oil temperature or pressure. In the summary several conclusions are formulated, based on presented test results. The determined maximal value of leakage is about 1 l/min. It emerged that the influence of centrifugal force is negligible. What is more, the observed phenomena are shortly described and projected for more detailed investigation.

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31

Dong, Liming. "An Enhanced Crack-Plugging and Pressure-Bearing Oil-Based Drilling Fluid System." Environmental and Earth Sciences Research Journal 7, no. 4 (2020): 164–68. http://dx.doi.org/10.18280/eesrj.070406.

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Compared with water-based drilling fluids (WBDF), oil-based drilling fluids (OBDF) are more prone to borehole leakage loss. Once borehole leakage occurs, it’s difficult to handle the leakage site and it will inevitably cause great economic losses. To cope with the major difficulties in OBDF leakage-proof and crack plugging, this paper conducted experiments on an enhanced crack-plugging and pressure-bearing OBDF system starting from the borehole leakage prevention measures. Then, by selecting and optimizing the materials of leakage-proof agent and crack-plugging agent for OBDF, this study prepared a new-type OBDF drilling leakage-proof agent and a new-type OBDF still crack-plugging agent and discussed their action mechanisms. Laboratory experiment and mechanism analysis results showed that, a well-proportioned combination of different type OBDF leakage-proof and crack-plugging materials such as rigid bridging particles, elastic filling particles, and fiber materials had a synergistic plugging effect and quickly formed a dense crack-plugging and pressure-bearing layer with a stable network structure (the "strong-force chain network" model), which had significantly improved the crack-plugging and pressure-bearing performance of the OBDF, and further optimized the enhanced crack-plugging and pressure-bearing OBDF system; before and after the heated rolling aging, the rheological properties and filtration loss performance of the system were good, and the filtration loss of the sand filter cake of the Permeability Plugging Apparatus (PPA) was only 11.4mL, therefore, the proposed agents exhibited good performance in drilling leakage-proof, crack-plugging, and pressure-bearing, and they were helpful to improve the pressure bearing ability of the earth stratums.

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32

Zong, Fu Xing, Ai She Shui, and Hui Wang. "Influence Factors Analysis of Oil Depot Valve Internal Leakage Quantitative Inspection Using Acoustic Emission." Advanced Materials Research 1030-1032 (September 2014): 1318–22. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.1318.

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This paper aims at the oil depot valve internal leakage quantitative inspection using acoustic emission. On the basis of giving the valve internal leakage quantitative model, the main factors which effected quantification of leakage rates are theoretical analyzed and the relative error estimation model is presented. The influence of main factors on the accuracy of leakage quantitative model and the correctness of the relative error estimation model are verified by experiments. Finally, research mentality on how to improve leakage quantitative model is proposed.

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33

Mobin, M., A. U. Malik, and F. Al-Muaili. "Stress Corrosion Cracking and Oil Leakage in a Control Oil Piping System." Journal of Failure Analysis and Prevention 9, no. 5 (2009): 409–13. http://dx.doi.org/10.1007/s11668-009-9279-1.

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34

Souza, Edgard de Castro, and Luiz Antonio Ribeiro. "FAILURES IN DTCS'S PIPELINES WITH PRODUCT LOSS." International Oil Spill Conference Proceedings 1997, no. 1 (1997): 373–78. http://dx.doi.org/10.7901/2169-3358-1997-1-373.

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ABSTRACT DTCS (Dutos e Terminais do Centro Oeste e São Paulo), an operational organ of PETROBRAS, is the organization responsible for the operation of a 2300-km-long pipeline system for the transportation of crude oil and hydrocarbons. Such a system, which is continually growing, has a representative history of leakage occurrences, particularly in its first years of operation. Based on a statistical analysis of these occurrences in the pipeline system, the number of leakages was reduced in the last few years through actions taken to minimize them. Criteria were established to define the proper moment for inspecting the pipelines with corrosion pigs, and other priority actions were also developed to reduce leakage occurrences. The data pertaining to occasional new leakage occurrences are analyzed every 6 months, and a report is issued proposing new actions or ratifying the existing ones.

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Qin, Tao, and Feng Lan Wang. "The Leakage Causes and Improving Measures of CB Series of Gear Oil Pump Based on Mechanical Mechanics." Advanced Materials Research 1022 (August 2014): 100–103. http://dx.doi.org/10.4028/www.scientific.net/amr.1022.100.

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When gear oil pump works, oil chamber is filled with high pressure oil, gear moves between housing and sealing devices and must maintain a certain gap between them, so that leakage is inevitable. In this paper, from structure and working principle of gear pump, the main factors influencing its leakage are spindle end gap, face clearance, radial clearance and the gap of the tooth contact surface. Taking effective measures to control the gear oil pump clearance and improve the working efficiency.

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Qing, Lvjun, Lichen Gu, Yan Wang, Wei Xue, and Zhufeng Lei. "The Piston Ring-Cylinder Bore Interface Leakage of Bent-Axis Piston Pumps Based on Elastohydrodynamic Lubrication and Rotation Speed." Shock and Vibration 2021 (February 22, 2021): 1–16. http://dx.doi.org/10.1155/2021/5534702.

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The bent-axis piston pump is the core component of electrohydrostatic actuators (EHA) in aerospace applications, and its wear of key friction interfaces is greatly related to the healthy operation of pumps. The leakage of the piston ring-cylinder bore interface (PRCB), as the important part of the return oil flow of the pump house that commonly assesses the wear of key friction interfaces in piston pumps, is changed with the rotation speed. Thus, the wear of key friction interfaces is usually inaccurate by using the leakage of PRCB. In order to obtain the relationship between the PRCB leakage and the rotation speed, an elastohydrodynamic lubrication model is proposed. First, the proposed model includes a minimum film thickness model of PRCB to analyze the dynamic change of oil film of PRCB when subject to the elastohydrodynamic lubrication. After that, a mathematical model of PRCB is induced by combining the minimum film thickness model with the flow equation, which helps produce the effects of the oil film on the leakage of PRCB. The proposed model is verified by numerical simulation and experiment. The results show that the leakage of PRCB has a negative effect on the return oil flow of the pump case in the range of rotation speed of 700–1300 r/min and discharge pressure of 10–20 MPa. Furthermore, the leakage of PRCB is proportional to the rotation speed, but the return oil flow of the pump case is decreased. The effects of rotation speed are enhanced under the high discharge pressure conditions.

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Kamaraj, Balasakthivel, Shankar C. Subramanian, and Baskaran Rakkiappan. "Numerical and experimental analysis of fluid–fluid interaction and flow through micro clearance to estimate leakages in a fuel injection pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 11 (2016): 2054–65. http://dx.doi.org/10.1177/0954406215626740.

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It has been observed during the operation of the diesel engine fuel injection pump that the fuel and the lubrication oil leak through the working clearance between the piston and the cylinder bore and mix with each other. The leakage of lubrication oil to fuel (OtF) leads to injector nozzle coking and emission, which necessitates the automotive industry to design a robust fuel injection pump to meet stringent emission norms. Similarly, the leakage of fuel to lubrication oil leads to depreciation of lubrication property of the oil, thereby reducing the life of engine oil lubricated components. In this research, the leakage flow through this clearance gap was studied using the numerical simulation tool, Ansys CFX, to estimate the volume flow rate of lubrication oil to fuel and fuel to lubrication oil. Pressure and drag effects are two important mechanisms that drive the leakage process. The simulation was carried out for various design parameters such as clearance, clearance taper and speed, and experiments were performed to determine the lubrication oil to fuel and fuel to lubrication oil flow rates. The diluted samples collected from fuel and lubrication oil tanks were analyzed using ICP-AES (inductively coupled plasma – atomic emission spectrometry) for calcium and barium element tracing. Calibration was performed on the ICP bench to study the accuracy and repeatability of the test sample analysis method. The results of numerical simulations and experiments were compared for various design parameters. The proposed analysis could serve as a valuable aid in the fuel injection pump development process.

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Hu, Guo Fu, and Shi Ping Yang. "The Oil Spill Analysis and Structure Improvement of Marine Sliding Bearing." Applied Mechanics and Materials 541-542 (March 2014): 549–52. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.549.

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In view of the problems serious leakage of lubricating oil in the current slide bearing of a ship motor shaft sealing.This paper analyzed the reasons of bearing oil through the work principle of sliding bearing and the sealing structure. And put forward to solve leakage measures, provide a certain reference value for the seal structure design of sliding bearings and other rotation machine .

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Ram Manda, Bhagwana, K. V. Sreedharan, S. Athmalingam, V. Balasubramaniyan, and P. Chellapandi. "Experience with Mechanical Seal of Prototype Fast Breeder Reactor’s Secondary Sodium Pump during Testing." Applied Mechanics and Materials 592-594 (July 2014): 1544–48. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.1544.

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Prototype fast breeder reactor’s (PFBR) secondary pumps have sealing between the rotating shaft and the stationary parts to prevent cover gas leakage into ambient air. This is achieved by means of triple mechanical seals with oil as buffer fluid. The oil for cooling the mechanical seals and bearing is supplied from an external source and is re-circulated after cooling and cleaning. During testing of secondary pumps several issues related to mechanical seal arrangement, material, oil temperature and oil leakage into process side were confronted. This paper discusses the successful resolution of such issues.

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Wang, Xin Hua, Li Mei Wang, Gang Zheng, Shu Wen Sun, and Rong Zun Yang. "Simulation of Leakage Model of Long-Distance Oil Pipeline Based on FLUENT." Applied Mechanics and Materials 310 (February 2013): 280–86. http://dx.doi.org/10.4028/www.scientific.net/amm.310.280.

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Based on the oil flowing state and the state equation of the long distance pipeline, the calculation method of leakage rate is analyzed when the pipeline leakage occurs. First, the leakage models of long-distance oil pipeline are established by FLUENT simulation, and the simulated results are close to the computed results, which prove the reliability of the simulation method, Then, through FLUENT simulating, the division of the models of the orifice leak, the macroporous leak and the pipe leak by the ratio of the leak-hole’s equivalent diameter to the pipe diameter is presented. Finally, the influence laws of the leak rates affected by the pipe diameter, the leak-hole’s equivalent diameter and the oil flow rate are investigated.

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Yang, Li Jian, Sen Lin Zhang, and Song Wei Gao. "ANSYS Simulation Technology of Pipeline Magnetic Flux Leakage Inspection." Advanced Materials Research 718-720 (July 2013): 1000–1005. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.1000.

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In order to solve the need of the oil and gas pipeline defect quantification in the real-time online defecting, magnetic flux leakage inspection method was applied to oil and gas pipeline inspection. According to the basic theory of the electromagnetic field, finite element solution of electromagnetic field and ANSYS electromagnetic field calculation theory, using the function of ANSYS 's simulation and calculation for magnetic field, three-dimensional finite element model of the oil and gas pipeline defect was built up. Through simulating, the relationship between defect signal and defect size was found, the optimal distance of the hall sensor lift-off value was verified, the best magnetization of leakage magnetic field was discussed, and various factors to influence the magnetic flux leakage signal is analyzed.

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Ishmuratov, Timur A., Rif G. Sultanov, and Milyausha N. Khusnutdinova. "Diagnostics of the location of damage to tubing oil well pipes." Tyumen State University Herald. Physical and Mathematical Modeling. Oil, Gas, Energy 5, no. 4 (2019): 115–28. http://dx.doi.org/10.21684/2411-7978-2019-5-4-115-128.

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The study is devoted to the mathematical description of the process of oil outflow in places of leakage of the tubing string, which allows a computer to locate a leakage in the tubing. The authors propose methodology for identifying defects in the tubing and determining the location of the leak. The uniqueness of this methodology lies in quick determination of the place of leakage without the use of specialists, sophisticated and specialized equipment. Mathematical modeling of oil flow in the tubing requires the apparatus of continuum mechanics. It is a general belief that the movement of oil in the pipe flows at low speeds due to its outflow from the hole. Using the general equations of mass and energy balance, the authors have obtained differential equations of fluid motion in a vertical pipe in the process of its outflow from the tubing and in the process of injection. Analytical expressions are the solution to these equations, as they can help in estimating the degree of damage and its location, as well as the feasibility of its eliminating. The results show that an increase in the leakage and injection times leads to improving accuracy of locating damage. Thus, when conducting various geological and technical measures (GTM) at the well, it is possible to assess the presence of leakage and its intensity when deciding on the repair of tubing.

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SHUANG, Z., T. YI, L. CHENYANG, L. TONG, Z. FENGJUN, and S. YANG. "SIMULATION AND ASSESSMENT OF SHALE OIL LEAKAGE DURING IN SITU OIL SHALE MINING." Oil Shale 31, no. 4 (2014): 337. http://dx.doi.org/10.3176/oil.2014.4.03.

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Wisen, Joshua, Romain Chesnaux, John Werring, Gilles Wendling, Paul Baudron, and Florent Barbecot. "A portrait of wellbore leakage in northeastern British Columbia, Canada." Proceedings of the National Academy of Sciences 117, no. 2 (2019): 913–22. http://dx.doi.org/10.1073/pnas.1817929116.

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Oil and gas well leakage is of public concern primarily due to the perceived risks of aquifer contamination and greenhouse gas (GHG) emissions. This study examined well leakage data from the British Columbia Oil and Gas Commission (BC OGC) to identify leakage pathways and initially quantify incident rates of leakage and GHG emissions from leaking wells. Three types of leakage are distinguished: “surface casing vent flow” (SCVF), “outside the surface casing leakage” (OSCL), and “cap leakage” (CL). In British Columbia (BC), the majority of reported incidents involve SCVF of gases, which does not pose a risk of aquifer contamination but does contribute to GHG emissions. Reported liquid leakage of brines and hydrocarbons is rarer. OSCL and CL of gas are more serious problems due to the risk of long-term leakage from abandoned wells; some were reported to be leaking gas several decades after they were permanently abandoned. According to the requirements of provincial regulation, 21,525 have been tested for leakage. In total, 2,329 wells in BC have had reported leakage during the lifetime of the well. This represents 10.8% of all wells in the assumed test population. However, it seems likely that wells drilled and/or abandoned before 2010 have unreported leakage. In BC, the total GHG emission from gas SCVF is estimated to reach about 75,000 t/y based on the existing inventory calculation; however, this number is likely higher due to underreporting.

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Leal, Flávia Martins, Carlos Henrique Ribeiro Camargo, Marcia Carneiro Valera, Gleyce Oliveira Silva, Tatiana Rocha De Oliveira, and Juliana Campos Junqueira. "Coronal bacterial leakage in root canals filled with single cone technique and different endodontic sealers." Brazilian Dental Science 17, no. 2 (2014): 57. http://dx.doi.org/10.14295/bds.2014.v17i2.991.

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<p>Objective: To evaluate coronal bacterial leakage comparing five endodontic sealers (AH Plus, Apexit Plus, Copaifera sp oil, EndoREZ and Polifil), and comparing root canals filled with EndoREZ sealer/EndoREZ® Points and EndoREZ sealer/conventional gutta-percha points.</p><p>Material and Methods: 84 human teeth were prepared and filled with gutta-percha points using the single cone technique. Roots were randomly divided into 6 groups: Apexit Plus, AH Plus, Copaifera sp oil, Polifil, EndoREZ, and EndoREZ/EndoREZ Points. After setting time, the roots were incorporated in a leakage model, which upper chamber contained a suspension of <em>Streptococcus mutans</em>, and lower chamber a broth. Leakage was assessed for turbidity in lower chamber for 60 days. Statistic analysis was performed using the nonparametric Kaplan-Meier method (p&lt;0.05).</p><p>Results: All experimental groups presented leakage during the study’s period. The medium time of leakage was: Apexit Plus and AH Plus 6,3 days, Polifil 5,1 days, Copaifera 1,2 days, and both EndoREZ groups infiltrated in the first day.</p><p>Conclusions: There was no statistically significant difference between the sealers Apexit Plus, AH Plus and Polifil, but they prevented leakage better than Copaifera sp oil and both EndoREZ groups. However, none of the tested sealers was capable of resisting coronal bacterial leakage for more than 22 days.</p>

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de Vasconcellos Araújo, Morgana, Severino Rodrigues de Farias Neto, Antonio Gilson Barbosa de Lima, and Flávia Daylane Tavares de Luna. "Hydrodynamic Study of Oil Leakage in Pipeline via CFD." Advances in Mechanical Engineering 6 (January 1, 2014): 170178. http://dx.doi.org/10.1155/2014/170178.

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This paper describes the transient dynamics behavior of oil flow in a pipe with the presence of one or two leaks through fluid dynamics simulations using the Ansys CFX commercial software. The pipe section is three-dimensional with a pipe length of 10 m, a pipe diameter of 20 cm, and leak diameter of 1.6 mm. The interest of this work is to evaluate the influence of the flow velocity, and the number and position of leaks on the transient pressure behavior. These new data may provide support for more efficient detection systems. Thus, this work intends to contribute to the development of tools of operations in oil and gas industry.

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Yu, Chunjian, Xiaodiao Huang, and Chenggang Fang. "Research on dynamic characteristics of NC rotary table considering leakage factors of its hydrostatic guideway." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 11 (2012): 2674–85. http://dx.doi.org/10.1177/0954406212437642.

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The rigidity and damping characteristics of a large and heavy NC rotary table have great influence on machining efficiency and the integrated machine’s dynamic accuracy, but test and control methods related to these characteristics are difficult to apply. In the axial direction, the table was supported by a constant current hydrostatic guideway; the guideway’s surface roughness and planeness errors were the main factors contributing to hydraulic oil leakage. Based on the force analysis of a ZT20SW driven by double worm gear pairs, a dynamic model and an electromechanical–hydraulic coupling model in the circumferential direction were established. Simulation and experimental results altogether indicated that the cutting force on the table, leakage characteristics and Coulomb frictional force of the hydrostatic guideway each have great effects on dynamical accuracy. In addition, test methods on the leakage’s equivalent oil film thickness offer a new comprehensive evaluation standard for the hydrostatic guideway’s geometric errors. The hydrostatic guideway’s Coulomb frictional force can be controlled reasonably to improve the table’s dynamic accuracy.

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YU, Li, Wentian JIANG, Xu YANG, and Chenglin SUN. "X55Degradation Effect of a Bioagent on Marine Oil Leakage." Chinese Journal of Appplied Environmental Biology 19, no. 2 (2013): 330–34. http://dx.doi.org/10.3724/sp.j.1145.2013.00330.

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Strmčnik, Ervin, and Franc Majdič. "Comparison of leakage level in water and oil hydraulics." Advances in Mechanical Engineering 9, no. 11 (2017): 168781401773772. http://dx.doi.org/10.1177/1687814017737723.

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Naruse, Ichiro, Toshio Inoue, Matsushige Sakai, Kiyoshi Yasui, and Masanobu Hasatani. "Development of Oil Leakage Detector for Dynamos and Transformers." KAGAKU KOGAKU RONBUNSHU 18, no. 5 (1992): 562–69. http://dx.doi.org/10.1252/kakoronbunshu.18.562.

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