东丽湖地热钻探CGSD01井钻完井技术

Summary of drilling and completion technology for Well CGSD01 in Dongli Lake geothermal drilling

摘要:

CGSD01井是由中国地质调查局组织实施的一口水热型地热资源调查井。该井完井深度405168 m，终孔直径216 mm。施工过程中遇到大直径套管下入安全系数不足、地层漏失、复杂地层岩心采取率低等问题。文章介绍了该井的井身结构设计、钻完井工艺技术。通过采用浮力法下管，多工艺堵漏，改进复杂地层取心工艺等措施解决了施工过程中的复杂问题，总结了该地区深部地热钻探钻井工艺并提出了完井建议。

Abstract:

Well CGSD01 is a hydrothermal geothermal resource survey well organized and implemented by China Geological Survey. The well was completed at the depth of 405168m with diameter of 216mm. During the drilling process, problems such as insufficient safety factor for largediameter casing running, formation leakage, low core recovery in complex formation were encountered. This paper introduces the well structure as well as drilling and completion technology for the well. The complex problems in the drilling process were solved by taking some measures such as buoyancyaided casing setting, multiprocess leak plugging, improvement of the coring process in complex strata. The drilling technology and completion recommendations for the deep geothermal drilling in this area are summarized.