Results 211 to 220 of about 109,385 (246)
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PRESSURE BEHAVIOR OF VERTICAL WELLS IN LOW-PERMEABILITY RESERVOIRS WITH THRESHOLD PRESSURE GRADIENT
Special Topics and Reviews in Porous Media, 2011The threshold pressure gradient, which is associated with non-Darcy flow in low permeability reservoirs, is defined as the level of pressure gradient that must be attained to enable the fluid to overcome the viscous forces and start to flow. If the pressure gradient is small, then the flow velocity increases slowly and obeys a nonlinear relationship ...
Jing Lu
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Applied Mathematics and Mechanics (English Edition), 1999
This paper studies the transient pressure of percolation during one production and one shutting in one dimension porous media with threshold pressure gradient, the differential equations are derived and solved with numerical computation. Basing on numerical solution, it is analyzed that: 1.
Liu Ciqun
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This paper studies the transient pressure of percolation during one production and one shutting in one dimension porous media with threshold pressure gradient, the differential equations are derived and solved with numerical computation. Basing on numerical solution, it is analyzed that: 1.
Liu Ciqun
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A fractal model for threshold pressure gradient of tight oil reservoirs
Journal of Petroleum Science and Engineering, 2019Abstract In tight oil reservoir, the flow channel of oil and water is tiny and the boundary layer effect is obvious, resulting in large flow resistance and high threshold pressure gradient. Taking into account of the fractal dimension of the pore throat and the tortuosity, a fractal model for calculating the threshold pressure gradient of tight oil ...
Xiuyu Wang
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Pressure transient analysis of low permeability reservoir with pseudo threshold pressure gradient
Journal of Petroleum Science and Engineering, 2016Abstract Threshold pressure gradient (TPG) is an important mechanism for fluid flow through low-permeability reservoirs, which would explain the phenomena that pressure derivative curves exhibit a straight line of slope that is larger than zero after radial flow regime.
Detang Lu, Daolun Li
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International Journal of Oil, Gas and Coal Technology, 2018
Many studies show that the threshold pressure gradient (TPG) is physics behind the upwarp of pressure derivative curves in intermediate and later time by using superposition principle to solve mathematics model with TPG, which misleads us to a dilemma: although TPG can match the measured build-up data, the interpreted TPG does not accord with reservoir
Detang Lu, Daolun Li, Yishan Zeng
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Many studies show that the threshold pressure gradient (TPG) is physics behind the upwarp of pressure derivative curves in intermediate and later time by using superposition principle to solve mathematics model with TPG, which misleads us to a dilemma: although TPG can match the measured build-up data, the interpreted TPG does not accord with reservoir
Detang Lu, Daolun Li, Yishan Zeng
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The Investigation of Threshold Pressure Gradient of Foam Flooding in Porous Media
Petroleum Science and Technology, 2011Abstract Porous media were simplified as a series of constricted capillary tubes related to particle size and arrangement, and the distribution of pore diameter and pore volume factor in the pore cell was calculated. Based on mechanics theory, the models of threshold pressure gradient (TPG) for a pore cell and porous media were obtained that provided a
W. Jing +4 more
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Investigation of the impact of threshold pressure gradient on gas production from hydrate deposits
Fuel, 2022Acknowledgements The authors are grateful to the National Natural Science Foundation of China (51991365), Key Special Project for Introduced Talents Team of Southern Marine 612 Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0105) and Key Program of Marine Economy Development (Six Marine Industries) Special 614 Foundation of ...
Xuwen Qin, Hang Bian, Yingfang Zhou
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Modification of Darcy's law for the threshold pressure gradient
Journal of Petroleum Science and Engineering, 1999Alvaro Prada, Faruk Civan
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The Research Progress of Threshold Pressure Gradient
Applied Mechanics and Materials, 2014Fluid seepage needs to overcome threshold pressure gradient in low permeability reservoir and heavy oil reservoir. A conclusion about the research progress of threshold pressure gradient was made by summarizing the literatures, which includes: the existence and experimental study of threshold pressure gradient, research of seepage theory considering ...
Xian Kang Xin, Gao Ming Yu, Zhou Fang
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The Factors of Pseudo Threshold Pressure Gradient
Advanced Materials Research, 2011In this paper, we have finished seepage experiments of natural cores from two different areas. And analyzing the data from experiments, we got the curves of permeability and threshold pressure gradients. We found these curves existed good correlation in logarithmic coordinates.
Zhi Qiang Zhu, Wei Xiong, Shu Sheng Gao
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