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Journal of Porous Media
Impact-faktor: 1.49 5-jähriger Impact-Faktor: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Druckformat: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019026122
pages 1667-1683

ANALYSIS OF PRESSURE-DEPENDENT RELATIVE PERMEABILITY IN PERMEABILITY JAIL OF TIGHT GAS RESERVOIRS AND ITS INFLUENCE ON TIGHT GAS PRODUCTION

Fei Mo
Chongqing University of Science and Technology
Zhimin Du
The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, P.R. China
Xiaolong Peng
The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, P.R. China
Baosheng Liang
Chevron North America Exploration and Production, 1400 Smith Street, Houston, Texas 77002, USA; The University of Texas at Austin, USA
Yong Tang
The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, P.R. China
Ping Yue
The State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, P.R. China

ABSTRAKT

This paper develops a model for pressure-dependent relative permeability in the presence of permeability jail and analyzes its influence on tight gas production. The model for pressure-dependent relative permeability is derived by introducing a pressure calibration coefficient into the modified Corey equation to describe the influence of pressure on gas flow capability in tight gas reservoirs. The model is validated using experimental data of tight sandstones and is compared with the conventional model. Pressure sensitivity of gas relative permeability is analyzed. Tight gas production affected by pressure-dependent relative permeability is also studied. Results demonstrate that the decrease of pressure can induce the increase of gas relative permeability. The effect of pressure is significant when pressure is low. However, under reservoir condition, when reservoir pressure falls, gas production decreases although gas relative permeability rises because the reduction of reservoir pressure leads to a decreasing pressure drop between reservoir pressure and bottomhole pressure, which has a more significant influence on tight gas production than the effect caused by the rise of gas relative permeability.

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