钻探工程DrillingEngineering第50卷增刊2023年9月Vol.50Sup.Sep.2023:358-364景谷凹陷钾盐地质调查JG-2井钻探施工技术易强忠1,王应科1,黎光朋1,喻忠伟2,汪林2,李启彪1(1.云南地质工程第二勘察院有限公司,云南昆明650200;2.中国地质调查局昆明自然资源调查中心,云南昆明650100)摘要:JG-2井是为进一步查明云南思茅盆地勐野井组钾盐资源而布置于景谷凹陷的调查井,地层岩性主要为泥岩、砂岩、泥砾岩和石盐等,在施工中存在井壁坍塌、缩径、钻头泥包、超径、岩心溶蚀、石盐矿层中机械钻速低、砂岩裂缝性漏失等问题。通过使用“无钾镁基饱和盐水钻井液”关键技术、改进钻头结构及使用PDC钻头、采用桥塞堵漏方法,较好地解决了岩心溶蚀、漏失、钻头泥包、钻探效率低等问题,最终完钻井深1829.44m,完钻口径133mm,盐层矿心采取率97.38%,取得了优质的钾石盐岩心和钻井质量。其施工技术经验可为以后同类工程提供借鉴。关键词:钾盐地质调查;岩心溶蚀;钻头泥包;无钾镁基饱和盐水钻井液;桥塞堵漏;绳索取心中图分类号:P634;TD87文献标识码:B文章编号:2096-9686(2023)S1-0358-07DrillingandconstructiontechnologyofWellJG-2ofpotashgeologicalsurveyinJinggusagYIQiangzhong1,WANGYingke1,LIGuangpeng1,YUZhongwei2,WANGLin2,LIQibiao1(1.YunnanGeologicalEngineeringSecondProspectingInstituteCo.,Ltd.,KunmingYunnan650200,China;2.KunmingCenterofNaturalResourcesSurvey,ChinaGeologicalSurvey,KunmingYunnan650100,China)Abstract:Potassiumsaltmineisoneofthemineralsurgentlyneededinourcountry.JG-2wellisageologicaldatasurveywellarrangedinJinggusaginordertofurtheridentifythepotassiumsaltresourcesofMengyejingFormationinSimaoBasin,YunnanProvince.Theformationlithologyismainlymudstone,sandstone,brecciaandstonesalt,etc.Duringtheconstruction,thehydrationexpansionandspallingofmudstoneandbrecciacausedthesafetyhazardsofshaftwallcollapse,diameterreductionandbitballing.Potassiumsaltrocklayeriseasytodissolve,dissolutionleadstosuperdiameter,coredissolution,diamondbitinstonesaltlayermechanicaldrillingrateislow,sandstonefractureleakageandotherproblems.Byusingthekeytechnologyof“Potassium‑magnesium‑basedsaturatedbrinedrillingfluid”,improvingthebitstructure...