钻井液与完井液2017，Vol.34Issue(3)：27-32,6.DOI:10.3969/j.issn.1001-5620.2017.03.005
可降解清洁钻井液的研究及现场应用
Study and Field Application of Degradable Clear Drilling Fluid
摘要
Abstract
A degradable clear drilling fluid has been developed with a gel enhancer BZ-2 and a film fixating agent GMJ to resolve the contradiction between the safety of drilling operation and the protection of coal beds in coal-bed methane drilling.Laboratory experiments were done to evaluate BZ-2 and GMJ for their inhibitive capacity,rheology,residue contents,and their influences on the strengths of formation cores.The experimental results showed that the clear drilling fluid had percent shale recovery of 93.5％,YP/PV ratio of 0.93 Pa/mPa · s,gel strengths of 2.5 Pa/3.0 Pa,yield point of 20.5 Pa,API filter loss of less than 12 mL,and residue content of 4.5 mg/L.The strength of the cores tested increased by 16.7％.This drilling fluid has been tested on 4 wells in the Zhengzhuang block,south of Qinshui basin in Shanxi Province.The test has successfully resolved the problems of drilling safety and coalbed protection in multilateral well drilling.Daily gas production rate has been increased by 2 times more than that of the wells nearby,and the calculated constant rate of gas production was between 3,000-5,000 m3/d,suggesting a good prospect of promotion.关键词
煤层气井钻井液/防止地层损害/无固相钻井液/可降解/封堵造壁性Key words
Drilling fluid for CBM drilling/Formation damage prevention/Solids-free drilling fluid/Degradable/Plugging and wall-building capability分类
能源科技引用本文复制引用
许朋琛,陈宁,胡景东,陈必武,王丽丽,滑志超,桑军元..可降解清洁钻井液的研究及现场应用[J].钻井液与完井液,2017,34(3):27-32,6.基金项目
中国石油集团渤海钻探工程有限公司项目“新型低荧光、环保型钻井液体系研究与现场应用”(2017Z48K) （2017Z48K）
中国石油集团渤海钻探工程有限公司项目“超分子化学堵漏技术研究”(2016Z61Y) （2016Z61Y）
“十三五”国家科技重大专项“复杂结构井、丛式井安全环保型钻井液新技术”(2017ZX05009-003). （2017ZX05009-003）
