疏水抑制水基钻井液体系研究及其在页岩气井的应用

发布时间：2018-04-19 07:49

本文选题：页岩气水平井 + 水基钻井液　；参考：《钻井液与完井液》2017年01期

【摘要】：针对龙马溪组页岩气水平井钻井井壁失稳问题,研制出一种疏水抑制剂CQ-SIA和一种液体润滑剂CQ-LSA,并形成一套疏水抑制水基钻井液体系。CQ-SIA具有双亲特性,能使亲水的岩石表面发生润湿反转,在岩石表面形成一层疏水膜,具有强化抑制与包被的作用,实验测得岩屑在1%CQ-SIA中的滚动回收率为83.72%,明显高于KPAM、AP-1以及KCl。CQ-LSA具有特定的基团与结构,能在亲水的钻具、泥饼和地层岩石表面形成亲油膜,降低摩阻,实验测得加有1%CQ-LSA的5%膨润土浆黏附系数为0.050 7,低于加有RH-220和BARALUBE的膨润土浆。该疏水抑制水基钻井液的抑制性和润滑性能与油基钻井液相当,具有良好的流变性能和抗污染性能,加有1%~3%防塌封堵剂、1%~2%聚合醇和0.8%~1.6%纳米封堵剂,封堵能力强。该体系在长宁H25-8井进行了首次现场试验,在1 500 m水平井段的钻井过程中,该体系各项性能稳定,配制维护工艺简单,井下未出现任何复杂,起下钻、电测、下套管、固井作业顺利,表明该体系能满足长宁页岩气水平井的钻井需要。
[Abstract]:A hydrophobic inhibitor (CQ-SIA) and a liquid lubricant (CQ-LSA) have been developed to solve the problem of instability in the drilling wall of shale gas horizontal well in Longmaxi formation, and a set of hydrophobic inhibition drilling fluid system. CQ-SIA has amphiphilic characteristics.The hydrophilic rock surface can be wetted and reversed, forming a hydrophobic film on the rock surface, which has the function of strengthening inhibition and wrapping.The experimental results show that the rolling recovery rate of cuttings in 1%CQ-SIA is 83.72, which is obviously higher than that of KPAMN AP-1 and KCl.CQ-LSA with specific groups and structures. It can form oil-lipophilic film on hydrophilic drilling tools, mud cakes and formation rocks, thus reducing friction.The adhesion coefficient of 5% bentonite slurry with 1%CQ-LSA is 0.050, which is lower than that with RH-220 and BARALUBE.The hydrophobic inhibition water-based drilling fluid has the same inhibition and lubricating properties as oil based drilling fluid, and has good rheological and anti-pollution properties. It has a good plugging ability by adding 1% 3% anti-sloughing plugging agent and 1% 2% polymeric alcohol and 0.8% 1.6% nanometer plugging agent.The system was tested in Changning H25-8 well for the first time. During the drilling process of 1 500m horizontal well section, the system has stable properties, simple preparation and maintenance technology, and no complication in downhole.The cementing operation is smooth, which shows that the system can meet the drilling needs of Changning shale gas horizontal well.
【作者单位】：油气田应用化学四川省重点实验室;川庆钻探工程有限公司钻采工程技术研究院;
【基金】：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)
【分类号】：TE254

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