摘要
气体钻井是目前元坝地区陆相地层提高钻速的重要手段之一。但在气体钻井结束转换为钻井液钻进后常出现井壁失稳、井漏问题。采用水基润湿反转剂解决了部分井井壁失稳问题,但由于工程和地质原因影响,仍有部分复杂井出现垮塌、划眼时间长以及井漏等复杂情况。在分析元坝地区气液转换过程中井壁失稳原因的基础上,研制出一套以油基润湿反转剂、油溶性乳化沥青以及柴油作为油基前置液,配合堵漏钻井液挤堵的气液转换施工工艺技术,并根据井壁稳定情况提出了2种不同的气液转换方式。在YB204-1H井和其他井的应用结果表明,油基前置液气液转换技术能预防井壁失稳和漏失发生,减少转换钻井液钻进后划眼时间,缩短非生产时间。
Gas drilling is one of the important methods to improve ROP in terrestrial formation in block of Yuanba,however,in the process of gas/liquid transformation,problems of wellbore instability and lost circulation are encountered frequently.The water-based wettability reversal agent can solve the problems of that in some wells,but caving reaming and lost circulation are still encountered in other wells because of the complicated situations of engineering and geology.Based on analysis of wellbore instability in the process of gas/liquid transformation,a kind of novel gas/liquid transformation technology is developed,which is composed of oil-based prepad fluid including wettability reversal agent emulsified asphalt and diesel,and lost circulation materials.Furthermore,two different transformation modes are introduced according to the situation of wellbore stability.The applications of well YB204-1H and other wells show that the oil-based prepad fluid can prevent wellbore instability and lost circulation so that it can reduce reaming time and decrease non-productive time.
出处
《钻井液与完井液》
CAS
北大核心
2013年第5期25-27,31,共4页
Drilling Fluid & Completion Fluid
基金
中石化先导项目"川西及川东北钻井提速技术"(P08030-T01)部分研究内容
关键词
元坝地区
气体钻井
油基前置液
井壁失稳
井漏
Block of Yuanba
Gas drilling
Oil-based prepad fluid
Wellbore instability
Lost circulation
