Drilling of a large diameter geological survey well （Well Chuanmudi-2） in Muchuan county of Sichuan province
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摘要: 大口径页岩气地质调查井（川沐地2井）部署在四川盆地西南缘五指山—天宫堂构造带建全—龙华复向斜的核部，设计井深2500 m，完钻井深2406.00 m。钻探目的是主探须家河组陆相页岩气，兼探雷口坡组常规气。本文介绍了川沐地2井的钻探施工情况，针对侏罗系易垮塌的泥岩和三叠系可钻性差的砂岩，开展了高效提速复合钻进、复杂地层钻井液、下套管固井工艺等应用研究，解决了垮塌段下套管固井难题，提高了钻探效率，建成了一口可供地层含气性测试的合格井，获取了岩心等实物资料，查明了该井区的地层层序，在三叠系须家河组—雷口坡组钻遇37层油气显示，实现了钻探目的及油气发现，为页岩气地质调查评价奠定了基础，对巩固乌蒙山区脱贫攻坚成果具有重要意义。Abstract: The large-diameter shale gas geological survey well （Well Chuanmudi-2） is located in the core of the Jianquan-Longhua synclinorium of the Wuzhishan-Tiangongtang structural belt in Southwestern Sichuan Basin with the design depth of 2500 m and the completion depth 2406.00 m. The drilling purpose is to explore continental shale gas in Xujiahe Formation and conventional gas in Leikoupo Formation. This paper introduces the drilling operations of Well Chuanmudi-2， whereby the application research on high-efficiency speed compound drilling， complex formation drilling fluid and casing cementing technology were carried out for the collapse prone mudstone of Jurassic and the poor drillability sandstone of Triassic. Through the research， the difficulty of casing cementing in the collapse section was resolved， drilling efficiency was improved， a qualified well for formation gas bearing test was built， the physical data such as core， cuttings and other were obtained， the stratigraphic sequence of the well area were identified， and the oil and gas display of layer 37 of Triassic Xujiahe Formation and Leikoupo Formation were hit； thus， achieving the drilling purpose， discovering oil & gas， and laying the foundation for shale gas geological investigation and evaluation which has a great significance to consolidate the poverty alleviation achievements in Wumeng Mountain area.
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Key words:
- large-diameter well /
- geological survey well /
- Well Chuanmudi-2 /
- shale gas drilling /
- compound drilling
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