摘要
给出了多分支井模拟CO2注入开采数学模型,模型考虑了气水两相流动、多组分气体吸附、煤基质膨胀和收缩对渗透率的影响以及分支水平井井筒压降;根据数学模型得到了相应的数值模型和计算程序,进行了模拟计算对比.计算结果显示:与只进行排水采气的基本衰竭开采方式相比,注入CO2后,煤层甲烷日产气量和累积产气量都有了很大幅度的提高.
According to mechanism of ECBM/CO2 sequestration, a mathematical model was developed. In the mathematical model, two -phase （water and gas） flow, multiple gas components and mixed gas sorption, impact of coal matrix shrinkage and swelling on permeability, pressure loss in wellbore were studied. In terms of the mathematical model, a numerical program was gained and a case was simulated. The simulation results show that the injection of CO2 can largely enhance daily production and cumulative production of coalbed methane.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2007年第4期402-406,共5页
Journal of China Coal Society
基金
国家教育部博士基金资助项目(20030425001)
关键词
多分支井
煤层甲烷
基质收缩膨胀
混合气体吸附
井筒压降
注气开采
multilateral wells
coalbed methane
matrix shrinkage and swelling
mixed gas sorption
wellbore pressure loss
gas flooding
