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Discussion of liquid threshold pressure gradient
Petroleum, 2017 Some authors believe that a minimum pressure gradient (called threshold pressure gradient (TPG)) is required before a liquid starts to flow in a porous medium.
Xiukun Wang, James J. Sheng
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Pseudo threshold pressure gradient to flow for low permeability reservoirs
Petroleum Exploration and Development, 2009 Rate-controlled Hg injection experiments, NMR core tests and core flooding experiments are carried out to study the low permeability cores from the Daqing and Changqing oilfields.
Xiong Wei +4 more
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Study on Variation Laws of Fluid Threshold Pressure Gradient in Low Permeable Reservoir [PDF]
Energies, 2020 A study on the seepage characteristics and laws of nano-micron pore throat in a low permeable reservoir matrix is of great significance for promoting high efficacy of low permeable reservoirs.
Mingwei Zhao +3 more
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Study on the Effect of Threshold Pressure Gradient on Remaining Oil Distribution in Heavy Oil Reservoirs. [PDF]
ACS Omega, 2022 Due to the spatial network structure, heavy oil has a high threshold pressure gradient when it flows through porous media, and the threshold pressure gradient plays a crucial role in the distribution of remaining oil. In previous study, the common methods to measure the threshold pressure gradient include the microflow-established differential pressure
Ke W, Liu Y, Zhao X, Yu G, Wang J.
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Multi-Scale Insights on the Threshold Pressure Gradient in Low-Permeability Porous Media [PDF]
Symmetry, 2020 Low-permeability porous medium usually has asymmetric distributions of pore sizes and pore-throat tortuosity, thus has a non-linear flow behavior with an initial pressure gradient observed in experiments. A threshold pressure gradient (TPG) has been proposed as a crucial parameter to describe this non-linear flow behavior. However, the determination of
Ali Alahmer, Andrew Chan, J G Wang
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The Influence of Movable Water on the Gas-Phase Threshold Pressure Gradient in Tight Gas Reservoirs
Energies, 2022 Threshold pressure gradient (TPG) is a key parameter determining the pore-scale fluid dynamics. In tight gas reservoirs, both gas and water exist in the porous rock, and the existing water can be divided into irreducible and movable water.
Weiyao Zhu +4 more
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A model for threshold pressure gradient in hydrate-bearing sediments during creep
Journal of Rock Mechanics and Geotechnical EngineeringThe flow behaviors of gas and water in hydrate-bearing sediments (HBS) are significantly affected by the threshold pressure gradient (TPG). During long-term natural gas hydrates (NGHs) mining, there exists creep deformation in HBS, which significantly ...
Jiangtao Qu +6 more
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High-Resolution Azimuth Estimation Method Based on a Pressure-Gradient MEMS Vector Hydrophone [PDF]
MicromachinesThe pressure-gradient Micro-Electro-Mechanical Systems (MEMS) vector hydrophone is a novel type of sensor capable of simultaneously acquiring both scalar and vectorial information within an acoustic field. Conventional azimuth estimation methods struggle
Xiao Chen, Ying Zhang, Yujie Chen
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Frontiers in Earth ScienceTight sandstone water-bearing gas reservoirs typically exhibit low porosity and low permeability, with reservoir rocks characterized by complex pore structures, often featuring micron-scale or smaller pore throats.
Yahui Li +5 more
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Analysis and Calculation of Threshold Pressure Gradient Based on Capillary Bundle [PDF]
Mathematical Problems in Engineering, 2021 Oilfield water injection is one of the important means to supplement energy to the formation and enhance oil recovery in the process of oilfield development. The level of water injection technology determines the effect of oilfield development and also determines the length of oilfield development life.
Shuangshuang Ren +5 more
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