Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient

doi:10.1088/1674-1056/25/2/024701

中国物理B ›› 2016, Vol. 25 ›› Issue (2): 24701-024701.doi: 10.1088/1674-1056/25/2/024701

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient

Wen-Chao Liu(刘文超), Yue-Wu Liu(刘曰武), Cong-Cong Niu(牛丛丛), Guo-Feng Han(韩国锋), Yi-Zhao Wan(万义钊)

Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2015-05-12 修回日期:2015-09-25 出版日期:2016-02-05 发布日期:2016-02-05
通讯作者: Yue-Wu Liu E-mail:liuyuewulxs@126.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51404232), the China Postdoctoral Science Foundation (Grant No. 2014M561074), and the National Science and Technology Major Project, China (Grant No. 2011ZX05038003).

Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient

Wen-Chao Liu(刘文超), Yue-Wu Liu(刘曰武), Cong-Cong Niu(牛丛丛), Guo-Feng Han(韩国锋), Yi-Zhao Wan(万义钊)

Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Received:2015-05-12 Revised:2015-09-25 Online:2016-02-05 Published:2016-02-05
Contact: Yue-Wu Liu E-mail:liuyuewulxs@126.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51404232), the China Postdoctoral Science Foundation (Grant No. 2014M561074), and the National Science and Technology Major Project, China (Grant No. 2011ZX05038003).

摘要/Abstract

摘要： The threshold pressure gradient and formation stress-sensitive effect as the two prominent physical phenomena in the development of a low-permeable reservoir are both considered here for building a new coupled moving boundary model of radial flow in porous medium. Moreover, the wellbore storage and skin effect are both incorporated into the inner boundary conditions in the model. It is known that the new coupled moving boundary model has strong nonlinearity. A coordinate transformation based fully implicit finite difference method is adopted to obtain its numerical solutions. The involved coordinate transformation can equivalently transform the dynamic flow region for the moving boundary model into a fixed region as a unit circle, which is very convenient for the model computation by the finite difference method on fixed spatial grids. By comparing the numerical solution obtained from other different numerical method in the existing literature, its validity can be verified. Eventually, the effects of permeability modulus, threshold pressure gradient, wellbore storage coefficient, and skin factor on the transient wellbore pressure, the derivative, and the formation pressure distribution are analyzed respectively.

关键词: threshold pressure gradient, stress-sensitive effect, wellbore storage, skin effect

Abstract: The threshold pressure gradient and formation stress-sensitive effect as the two prominent physical phenomena in the development of a low-permeable reservoir are both considered here for building a new coupled moving boundary model of radial flow in porous medium. Moreover, the wellbore storage and skin effect are both incorporated into the inner boundary conditions in the model. It is known that the new coupled moving boundary model has strong nonlinearity. A coordinate transformation based fully implicit finite difference method is adopted to obtain its numerical solutions. The involved coordinate transformation can equivalently transform the dynamic flow region for the moving boundary model into a fixed region as a unit circle, which is very convenient for the model computation by the finite difference method on fixed spatial grids. By comparing the numerical solution obtained from other different numerical method in the existing literature, its validity can be verified. Eventually, the effects of permeability modulus, threshold pressure gradient, wellbore storage coefficient, and skin factor on the transient wellbore pressure, the derivative, and the formation pressure distribution are analyzed respectively.

Key words: threshold pressure gradient, stress-sensitive effect, wellbore storage, skin effect

中图分类号: (Finite difference methods)

47.11.Bc

47.56.+r (Flows through porous media) 02.70.Bf (Finite-difference methods)

刘文超, 刘曰武, 牛丛丛, 韩国锋, 万义钊. Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient[J]. 中国物理B, 2016, 25(2): 24701-024701.

Wen-Chao Liu(刘文超), Yue-Wu Liu(刘曰武), Cong-Cong Niu(牛丛丛), Guo-Feng Han(韩国锋), Yi-Zhao Wan(万义钊). Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient[J]. Chin. Phys. B, 2016, 25(2): 24701-024701.

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Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient

Numerical investigation of a coupled moving boundary model of radial flow in low-permeable stress-sensitive reservoir with threshold pressure gradient

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