摘要
对煤层气的流动机理进行了分析。结果表明 ,煤层中的甲烷气主要以吸附的方式储集在煤基质中 ,煤层割理系统提供渗流通道。煤层气在煤基质中的吸附遵循朗格缪尔等温方程 ;煤层气由煤基质向割理系统的扩散遵循Fick第一定律 ;煤层气在割理系统的流动遵循达西定律。借鉴美国现有模型 ,结合我国现场实际情况 ,建立了二维煤层气垂直井的非平衡拟稳态井底渗流数学模型。现场实例模拟计算表明 ,该模型能够用于煤层气单井数值模拟。
Coalbed methane exists in a coal matrix by adsorption. The cleat system of coals acts an flow channel. The adsorption of coalgas is determined by Langmuir equation in the coal matrix. The diffusion process to the cleat system is described by using Fick's law. The flow in the cleat system can be described by Darcy's law. Two dimensional non equilibrium sorption pseudo steady state model of coalbed methane for vertical well is derived in combination of an American model with the filed situation. The numerical simulation model of coalbed methane for single well is testified by on site examples.
出处
《石油大学学报（自然科学版）》
CSCD
2000年第2期47-49,53,共4页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
中国石油天然气集团公司重点项目!(97024)
关键词
煤层气
数值模拟
单井开采
coalbed methane
production
coal matrix
cleat system
adsorption
mathematical model
numerical simulation
