第34卷第3期 2017年5月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
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
Vol.34 No. 3 May2017
许朋琛，陈宁1，胡景东，陈必武2，王丽丽1，滑志超，桑军元1（1.中国石油集团激海钻探第四钻井工程分公司，河北任丘062552；2.中国石油华北油田煤层气分公司，山西晋城048000）许朋深，陈宁，胡景东，等.可降解清洁钻并渡的研究及现场应用[].钻井液与完井液，2017，34（3）：27-32.
XU Pengchen, CHEN Ning, HU Jingdong, et al.Study and field application of degradable clear drilling fluid[J].Drilling Fluid & Completion Fluid, 2017. 34(3):27-32.
摘要针对煤层气井钻井过程中钻井安全和煤层保护之间的矛盾间题，研制了钻井液用提切剂BZ-2和围膜剂GMJ，并以此为核心开发了可降解清洁钻并液体系。对BZ-2和GMJ的抑制性、流变性、残量及对岩心强度的影响等性能进行了评价。实验结果表明，该体系的页岩国收率为93.5%；流变性好，动比达到0.93Pa/mPas，初切、终切、动切力分别为2.5、3.0、20.5Pa；API滤失量控制在12mL以内，我渣量为4.5mg/L，卷心强度增加了16.7%。该体系已在山西冷水盆地南部晋域斜坡带郑庄区块4口并进行试验。试验效果表明，其解决了该区块多分支水平井的钻井安全和煤层保护间题， 00000
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
中图分类号：TE254.3
文献标识码：A
文章编号：1001-5620（2017）03-0027-06
Study and Field Application of Degradable ClearDrilling Fluid
XU Pengchen', CHEN Ning', HU Jingdong', CHEN Biwu', WANG Lili', HUA Zhichao', SANG Junyuan'(1. The Fourth Drilling Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552;
2. CBM Division of PetroChina Huabei Oilfield Company,Jincheng, Shanxi 048000)
Abstract A degradable clear drilling fluid has been developeid 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/Py 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 ofless 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,o00-5,000 m/d, suggesting a good prospect of promotion
Key words Dilling fuid for CBM dilling; Formation damage prevention; Solids-free drilling fluid; Degradable; Plugging and wall-building capability
煤层胶结疏松、结构不强、易破碎是煤层气钻井中的难点问题"，其钻井方式、工艺、钻井液和完井方式的选用都与常规油气井明显不同[2-3)。其
井眼稳定和煤层保护之间的矛盾仍十分突出[46] 传统的煤层气井钻井液均含有膨润土等固相颗粒或聚合物类处理剂，而聚合物类处理剂通过吸附、机
基金项目：中国石油集团激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)；（1990）国结构井、丛式并安全环保型钻并液新技术”（2017ZX05009-003）。
第一作者简介：许朋深，工程师，现在主要从事钻并液体系研究与应用的工作。电话18631779601；E-mail：
xpc-111@163.com。万方数据