新疆阜康矿区四工河区块煤储层敏感性分析

Sensitivity Analysis of Block Coal Reservoir in the West Sigonghe District of Fukang Mining Area,Xinjiang

为研究新疆阜康矿区四工河区块煤层气开采过程中渗透率对煤储层的损害程度,对该区A2和A5煤层开展了应力敏感性、速敏性、水敏性、酸敏性、碱敏性实验。结果表明:研究区储层具有中等偏强的应力敏感性、速敏性和偏弱的水敏性、酸敏性和碱敏性;伤害储层的主因为应力敏感性与速敏性;净围压的增大导致煤样塑性变形,随入口压力增加,煤样渗透率急剧下降。

In order to study the damage degree of permeability to coal reservoir during coalbed methane mining in Sigonghe Block,Fukang mining area,Xinjiang,the stress sensitivity,velocity sensitivity,water sensitivity,acid sensitivity and alkali sensitivity experiments were carried out on A2 and A5 coal seams in this area.The results show that the reservoir in the study area has medium strong stress sensitivity and velocity sensitivity,and weak water sensitivity,acid sensitivity and alkali sensitivity.The main factors that damage reservoir are stress sensitivity and velocity sensitivity.The increase of net confining pressure leads to plastic deformation of coal sample.With the increase of inlet pressure,the permeability of coal sample decreases sharply.