基于煤层气可降解的羽状水平井钻井液室内研究  

Laboratory research on degradable drilling fluid for pinnate horizontal well based on coalbed methane

作　　者：岳前升[1] 邹来方[2] 蒋光忠[1] 田中兰[2] 胡友林[3] 汪伟英[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]中国石油天然气集团公司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》2010年第10期1692-1695,共4页Journal of China Coal Society

基　　金：国家重大煤层气专项课题(2008ZX05036-001);湖北省自然科学基金重点资助项目(2009CDA008)

摘　　要：为解决煤层气羽状水平井井眼净化、井壁稳定和储层保护之间的矛盾,研制出可生物降解的钻井液技术。该钻井液为无固相聚合物钻井液体系,具有较高的动塑比和低剪切速率黏度,能很好地稳定井壁和保持井眼清洁。优选出能够降解无固相聚合物钻井液的生物酶,测试结果表明:该生物酶在0.01%加量、1h能有效降解钻井液,较适宜的降解环境为:pH=5.5～7.0,温度20～50℃,氯化钠和氯化钾对生物酶降解效果影响较小。To solve the contradictions among hole cleaning,wellbore stability and reservoir protection of pinnate horizontal well drilling for the coalbed methane,the technique of biodegradable drilling fluid was developed.The solid-free polymer drilling fluid has the properties of high YP/PV ratio and low shear rate viscosity,which are beneficial to keep borehole stability and hole cleaning.The enzyme can degrade the polymer drilling fluid effectively was optimized.The test results show that the enzyme can degrade drilling fluid in one hour with the dosage of 0.01%,and the appropriate degradation environment：pH=5.5～7.0,the temperature is 20～50 ℃.Sodium chloride and potassium chloride have little effect on the degradation of enzyme.

关 键 词：煤层气 羽状水平井 钻井液 生物降解 地层损害 生物酶 

分 类 号：TE254.1[石油与天然气工程—油气井工程]