大牛地气田煤岩地层井壁稳定性研究方法  

Research Method of Wellbore Stability of Coal Formation in the Daniudi Gas Field

作　　者：程福山[1] 李忠慧[1,2] 楼一珊[1,2] 郑力会 翟晓鹏[1] 朱亮[1] 

机构地区：[1]长江大学石油工程学院 [2]油气钻井技术国家工程实验室防漏堵漏研究室

出　　处：《石油机械》2015年第10期5-8,共4页China Petroleum Machinery

基　　金：国家科技重大专项"鄂尔多斯盆地东缘煤层气开发示范工程柳林地区煤层气储层伤害控制技术"(2011ZX05062-002)

摘　　要：针对煤层气井井壁失稳的研究大多基于连续介质力学的方法,很少从流固耦合角度进行研究。鉴于此,通过对煤样进行单轴和3轴抗压强度试验研究煤岩的力学特性,得出煤岩破坏符合Coulmob强度准则的结论,并据此建立流固耦合模型,得出了最小破坏程度时的钻井液密度,并发现维持井壁破坏程度最小的钻井液密度随着井斜角的增大而增大,并在实际工程中采用推荐的钻井液密度,验证了Coulmob强度准则基础上的流固耦合分析方法的有效性。Most studies on the coalbed wellbore stability are based on continuum mechanics, few research has involved fluid?structure coupling?The coal mechanical properties have been studied through the uniaxial and 3?axis compressive strength test of coal samples, indicating that the coal failure is in line with the Coulmob strength crite?rion?Based on the study, the fluid?structure coupling model is established?Then, the drilling fluid density led to minimal wellbore damage is obtained and is found to increase with the increase of the well inclination?The recom?mended fluid density in the actual project has verified the validity of flow of fluid?structure coupling method on the basis of Coulmob strength criterion.

关 键 词：煤层气 井壁稳定 流固耦合 Coulmob强度准则 脆性破坏 

分 类 号：TE28[石油与天然气工程—油气井工程]