钻井液与完井液2017，Vol.34Issue(5)：44-49,6.DOI:10.3969/j.issn.1001-5620.2017.05.008
长宁页岩气井钻井复杂情况及钻井液工艺技术
Drilling Challenges and Drilling Fluid Technologies for Shale Gas Drilling in Changning Area
摘要
Abstract
Challenges encountered in shale gas drilling in Changning area from the Jialingjiang Formation to Hanjiadian Formation are as follows: bit balling in drilling long section of mudstones, mechanical collapse of formation with developed beddings, borehole wall collapse in drilling the top section of well causing pipe sticking, developed fractures with good connectivity resulting in mud losses, borehole enlargement resulted from formation creep, and contamination to drilling fluid by mudstones. Challenges encountered in drilling fluid maintenance and the solution were also provided in this paper. Based on the analyses of drilling problems encountered from Jialingjiang Formation and Hanjiadian Formation, the drilling fluid formulation to be used was optimized accordingly. The optimized drilling fluid was used in 10 times in different wells in Changning area, greatly reduced the occurrence of downhole problems. With the optimized drilling fluid, the Jialingjiang gypsum formation was penetrated with no troubles, the Feixianguan mudstone formation was drilled with success, and cave-in of the Changxing-Longtan formations was avoided. Any downhole complicationsrelated with drilling fluid were all avoided. Lithology variance in the Changning area is remarkable. An in-depth understanding of the formations in this area, and specific suggestions and measures presented in drilling fluids design help minimize the occurrence of downhole complications, providing technical support to quality, efficient and cost-effective drilling of shale gas.关键词
页岩气/复杂地层/井下复杂/钻井液Key words
Shale gas/Troublesome formation/Downhole complication/Drilling fluid分类
能源科技引用本文复制引用
明显森,袁志平,宾承刚..长宁页岩气井钻井复杂情况及钻井液工艺技术[J].钻井液与完井液,2017,34(5):44-49,6.基金项目
国家科技重大专项课题"页岩气水平井水基钻井液研究与试验"(2016ZX05022-001-002). （2016ZX05022-001-002）
