Phase Behavior and Flow Mechanisms of Desorption Gas in Coal Matrix

被引：6

作者：

Xu, B. ^{[1
]}

Li, X. ^{[2
]}

Zhao, M. ^{[2
]}

Hu, A-M. ^{[3
]}

Chen, D. ^{[3
]}

Zhang, D. ^{[4
]}

机构：

[1] CNOOC Res Inst, Beijing 100028, Peoples R China

[2] China Univ Petr, Beijing, Peoples R China

[3] China United Coalbed Methane Engn Res Ctr CO Ltd, Beijing, Peoples R China

[4] Petrochina Coalbed Methane Co Ltd, Hancheng, Peoples R China

来源：

ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS | 2015年 / 37卷 / 04期

关键词：

coal matrix; dissolved gas; free gas; transport mechanism; two-phase flow;

D O I：

10.1080/15567036.2011.582612

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

080707 [能源环境工程]; 082001 [油气井工程];

摘要：

Gas transport through coal matrix is generally assumed to be dominated by gas phase diffusion. However, the matrix pores contain a certain amount of water, which occupies the gas phase diffusion channels. Gas phase diffusion theory cannot be used to interpret the effect of water. This article studies the phase behavior and flow mechanisms in coal matrix. It concludes that the desorbed gas exists in matrix pores with two states: dissolved gas and free gas. Dissolved gas diffuses in water, and free gas flows into the cleats. These results provide a theoretical basis for well productivity prediction and well testing.

引用

页码：365 / 371

页数：7

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