煤层气水平井钻井过程储层损害机理  

Lab investigation on damage mechanism of coal reservoir for pinnate horizontal well based on coalbed methane

作　　者：岳前升[1] 邹来方 蒋光忠[1] 田中兰 胡友林[3] 黄志强[3] 

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]中国石油集团钻井工程技术研究院,北京100195 [3]长江大学石油工程学院,湖北荆州434023

出　　处：《煤炭学报》2012年第1期91-95,共5页Journal of China Coal Society

基　　金：大型油气田及煤层气开发国家科技重大专项资助项目(2011ZX05036-001)

摘　　要：以山西沁水盆地山西组3号煤层为研究对象,对羽状水平井钻井过程可能发生损害煤储层因素如钻井液固相、水敏损害、应力敏感性、毛细现象、结垢和聚合物堵塞等进行了实验研究。结果表明,山西沁水盆地3号煤层孔隙度和渗透率均较低,煤层黏土矿物含量较高,水敏损害、结垢、钻井液固相侵入和聚合物堵塞是水平井钻井过程中造成煤储层损害的主要因素。使用合适矿化度、密度和具有防垢功能的钻井液以及可解除的钻井液处理剂是煤层气水平井钻井过程保护煤储层的有效措施。Taking No.3 coal in Qinshui Basin as research object,factors such as solid phase of drilling fluid,water sensitivity,stress sensitivity,scaling,capillarity and polymer plugging which maybe damage coal reservoir were researched during coalbed methane drilling.Sample results analyzed show that No.3 coal reservoir has low porosity and low permeability,high content of clay mineral.Lab evaluation results show water sensitivity,scaling,solid phase invasion of drilling fluid and polymer plugging are factors which induce the coal reservoir damage.Drilling fluid which has suitable salinity,suitable density,anti-scaling,and removable drilling fluid agents can protect coal reservoir from damage during drilling for pinnate horizontal wells.

关 键 词：煤层气 沁水盆地 羽状水平井 钻井液 地层损害 敏感性 

分 类 号：P618.11[天文地球—矿床学]