Pseudosteady-State Trinomial Deliverability Equation and Application of Low Permeability Gas Reservoir

Xinjiang Petroleum Geology ›› 2009, Vol. 30 ›› Issue (5): 593-595.

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Pseudosteady-State Trinomial Deliverability Equation and Application of Low Permeability Gas Reservoir

LI Min¹, XUE Guo-qing², LUO Bi-hua², YANG Wen-juan¹

1.State Key Laboratory of Oil and Gas Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2.Research Institute, Zhanjiang Oilfield Company, CNOOC, Zhanjiang, Guangdong 524057, China

Received:2008-12-04 Revised:2009-02-16 Online:2009-10-01 Published:2020-09-30

Abstract

Abstract: Low permeability gas reservoir is characterized by low porosity, low permeability, serious heterogeneity and high water saturation, etc, which result in that the threshold pressure gradient effect similar to liquid percolation is remarkable for gas percolation. The conventional binomial deliverability equation is hard used to describe the real flow feature and deliverability of gas in such a reservoir. Adding the item of threshold pressure gradient into this equation, integrated with gas well performance in ordinary production period, this paper deduces the pseudosteady-state trinomial deliverability equation considering the threshold pressure gradient and presents the formula for calculating open flow potential of gas well in low permeability reservoir, so as to offer theoretical basis for determination of its rational production.

Key words: low permeability reservoir, threshold pressure gradient, deliverability equation

CLC Number:

TE313.8

LI Min, XUE Guo-qing, LUO Bi-hua, YANG Wen-juan. Pseudosteady-State Trinomial Deliverability Equation and Application of Low Permeability Gas Reservoir[J]. Xinjiang Petroleum Geology, 2009, 30(5): 593-595.

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Pseudosteady-State Trinomial Deliverability Equation and Application of Low Permeability Gas Reservoir

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