摘要
基于水力压裂增产机理,构建了水力压裂后煤层气井产气量计算模型,编制程序模拟了裂缝参数对煤层气井产气量的影响。结果表明:水力压裂后煤层气日产气量曲线在形态上表现出低-高-低-高-低的特征;随着裂缝长度的增加,日产气量和累计产气量明显增加;当水力裂缝的导流能力小于临界导流能力时,产气量随导流能力的增大而增加,大于临界导流能力时,产气量将保持为临界导流能力时的产气量;增加裂缝的长度比增加裂缝的导流能力更有利于产气量的增加。
Coalbed methane wells gas production computational model has been established and the effects of crack programming parameters on coalbed methane gas production has been stimulated by computer program based on mechanism of hydraulic fracturing increases gas production. The results showed that: the curve of coalbed methane gas production exhibit low-high-low-high-low trend after hydraulic fracturing; coalbed methane daily gas production cumulative gas production increased significantly with the increase of the crack length; when the conductivity is less than the critical conductivity of hydraulic fracture, gas production increased with the increase in conductivity; when the conductivity is greater than the critical conductivity of hydraulic fracture, the gas production will keep gas production during the critical conductivity; due to the low permeability of coal seams, increase in length of fracture is more conducive to gas production than increasing fracture conductivity.
出处
《煤炭技术》
CAS
北大核心
2014年第5期243-246,共4页
Coal Technology
基金
陕西省教育厅科研计划项目资助(2013JK0863)
中国博士后科学基金资助项目(2013M542365)
关键词
水力裂缝
煤层气井
产气量
导流能力
hydraulic fracture
coalbed methane wells
gas production
conductivity
