西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (3): 137-140.

• 石油与天然气工程 • 上一篇    下一篇

煤层气窜流扩散过程及其对开发效果的影响

石丽娜 杜庆军 同登科
  

  1. 中国石油大学(华东)数学与计算科学学院,山东东营257061
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-20 发布日期:2011-06-20

The Channeling-diffusion Process of Coalbed Methane and Their Influences on Development Effect

SHI Li-na DU Qing-jun TONG Deng-ke
  

  1. College of Mathematics and Computational Science, China University of Petroleum, Dongying, Shandong 257061, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-20 Published:2011-06-20

摘要: 基于煤层气的赋存和运移规律,综合考虑煤层气从煤基质中解吸,并以扩散和窜流方式进入煤层割理,通过渗透和扩散方式从割理流入生产井筒的过程,将煤层气在微孔中的非平衡吸附模型与气水两相渗流模型耦合,建立了双重介质煤层气藏拟稳态渗流数学模型。采用该模型研究了窜流和扩散机理对开发效果的影响。结果表明:窜流和扩散对开发后期产气量的影响较明显,窜流因子或扩散系数越大,后期产气量越多。

关键词:

煤层气, 数值模拟, 拟稳态, 非平衡吸附, 开发

Abstract: Based on the occurrence and migration law of coalbed methane, and the analysis of coalbed methane desorption from matrix of coal by way of channeling and diffusion, through the process from which the cleat to the production borehole by way of permeation and diffusion, then coupling the unequilibrium adsorption model of coalbed methane in the Millipore with gas-water two-phase percolation model together, the Dual media coalbed methane reservoir simulation steady state percolation mathematical model is formed. A homologous numerical model is established according the ADI-FDTD method. For channeling and diffusion method, we make a research on their influences on development effectiveness based on this model. The results show that channeling and diffusion have greater influences on gas production in the late period. The greater the channeling factor or diffusion coefficient are, the higher the gas production is.

Key words:

coalbed methane, numerical simulation, simulation steady state, unequilibrium adsorption, development

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