页岩气地质调查井浙桐地1井钻探施工技术

Drilling technology for Well Zhetongdi-1 for shale gas geological survey

摘要:

浙桐地1井是部署在浙江省桐庐县百江镇境内的一口页岩气地质调查井。该井旨在通过钻取地层岩心及测录井等工作方法探索下扬子地区页岩气新层系奥陶系胡乐组、宁国组泥页岩含气性。文章详细介绍了该井基本情况、钻探施工工艺以及孔斜超标处理方法。在孔深140 m时孔斜严重超标达9.3°，水泥封孔重钻。项目组通过钻压、转速、泵量等钻进参数优化组合并采用底喷同心圆尖齿组合型钻头，克服了地层强造斜性引起的易井斜问题，完钻后测得最大井斜5.5°，符合设计要求。

Abstract:

Well Zhetongdi-1 is a shale gas geological survey well deployed in Baijiang Town, Tonglu County, Zhejiang Province. The well is aimed to explore the gas-bearing properties of the shale gas new strata of the Ordovician Hule Formation and Ningguo Formation in the Lower Yangtze area by taking cores and logging wells. The article describes in detail the basic conditions of the well, the drilling process and the well deviation treatment method. When the depth was 140m, the well deviation was serious and exceeded the specification by 9.3°; thus, it was plugged and was re-drilled. Through optimum combination of drilling parameters such as weight-on-bit, rpm, and pumping volume, and use of the bottom jet bit with concentric pointed teeth, well deviation caused by the strong deflecting formation was eliminated with maximum deviation of 5.5°, meeting design requirements.