第34卷第3期 2017年5月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi: 10.3969/j.issn.1001-5620.2017.03.004
Vol.34 No.3 May2017
龙马溪页岩并壁失稳机理及高性能水基钻并液技术唐文泉1,23，高书阳2.3，王成彪，甄剑武2.3，陈晓飞2.3，柴龙2,3
（1.中国地质大学（北京），北京100083；2.中国石化石油工程技术研究院，北京100101；
3.页岩油气富集机理与有效开发国家重点实验室，北京100101）
唐文泉，高书阳，王成彪，等.龙马溪页岩井壁失稳机理及高性能水基钻井液技术[].钻井液与完井液，2017,34（3)：21-26. TANG Wenquan, GAO Shuyang, WANG Chengbiao, dt al.Research on mechanisms of wellbore instability of longmaxi shale
formation and high performance water base drilling fluid technblogy[Jj, Drilling Fluid & Completion Fluid, 2017, 34 (3) : 21-26.
摘要目前长水平井投并壁失稳问题仍是制约国内外页岩气资源钻探开发的重大工程技术难题。为解决龙马溪组页岩长水平井段的并壁失稳间题，采用X射线衍射分析、氮气孔障体积测试、高压压汞测试、高分筛率场发射扫描电镜、CT扫描、岩石连续刻划强度等实验，分析了龙马溪组页岩微观组构特征及理化特性，
探讨了微观组构特征、理化特性对龙马溪组页
岩并壁稳定的影响。研究表明：龙马溪页岩富含脆性矿物，黏土矿物以伊蒙混层为主，微纳米孔隙发育，微裂除呈续状、近平行分布，敏感性矿物的存在及其层理、徽裂缝发育是导致页岩并璧失稳的主要内在因素。为此，针对性地提出了多元协同稳定并壁水基钻并液防竭技术对策，即“强化对堵-适度抑制-合理密度-高效润清"。应用该技术对策构建了高性能水基钻并液优化配方，评价表明，该体系有较好的封堵性和抑制裂缝扩展的能力。该体系在黄金坝区块2口并三开进行了现场试验。现场试验结果表明，该体系较好地解决了贾碧长水平井段的井壁失稳和水乎段摩阻较大的问题，为中国采用水基钻并液技术高效钻探开发页卷气资源提供了新的思路及经验。
关键词页岩气；井壁失稳；微纳米尺度；孔腺结构；水基钻井液
中图分类号：TE254.3
文献标识码：A
文章编号：1001-5620（2017）03-0021-06
Research on Mechanisms of Wellbore Instability of Longmaxi Shale Formation and High Performance
WaterBaseDrillingFluidTechnology
TANG Wenquanl.2,3, GAO Shuyang-3, WANG Chengbiao', ZHEN Jianwu2.3, CHEN Xiaofei2-3, CHAI Long23
(1. China University of Geosciences (Beijing), Beijing 100083;
2.SinopecResearchInstitute ofPetroleumEngineering,Beijing100101;
3.StateKeyLaboratoryof ShaleOil andGas EnrichmentMechanisms andEfectiveDevelopment,Beijing100101)
Abstract Presently the problem of wellbore instability in long horizontal wells is still a major technical problem in hindering thc development of shale gas resources in the world. To solve this problem encountered in the long horizontal well section penetrating the shaly Longmaxi Formation, XRD analysis, pore volume tests by helium adsorption, high pressure mercury test, high resolution field emission SEM, CT scanning and continuous rock engraving strength experiments were used to analyse the micro petro-fabric and physicochemical characteristics of the Longmaxi shale, and their effects on borehole stabilization. The studies showed that the Longmaxi shale was rich in brittle minerals, and the clay minerals were mainly I/S mixed layers. Pores of micro- and nano-meters in sizes were developed, and micro cracks in the formation were slit shaped and in nearly parallel distribution. The presence of water sensitive minerals and the beddings developed therein as well as the micro fractures were the main factors causing shale wellbore instability. A set of wellbore stabilization measures was presented to solve these problems using inhibitive water base drilling fluid with synergistic effect, that is, borehole wall plugging strengthening - controlled inhibitive capacity of drilling fluid reasonable density of
（190S0910）岩油气高效开发基础理论研究”（51490650）、“川西低渗气藏低伤害钻井液技术研究”（2016ZX05021004-002）联合资助。
第一作者简介：唐文泉，工程师，1982年生，在读博士研究生，主要从事地质工程、并壁稳定与钻井液技术研究工作。
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