黔西南地区煤系地层井壁稳定技术探讨
投稿时间:2018-10-29  修订日期:2019-05-15  点此下载全文
引用本文:郝海洋,李勇1,宋继伟,王虎,李勇2,代云鹏.黔西南地区煤系地层井壁稳定技术探讨[J].探矿工程(岩土钻掘工程),2019,46(7):8-13,33.
HAO Haiyang,LI Yong,SONG Jiwei,WANG Hu,LI Yong,DAI Yunpeng. Wellbore stabilization techniques incoal-bearing formation in Southwestern Guizhou[J]. Exploration Engineering (Rock & Soil Drilling and Tunneling), 2019,46(7):8-13,33.
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作者单位E-mail
郝海洋 贵州省地质矿产勘查开发局一一五地质大队 haiyanghao2016@126.com 
李勇1 贵州省地质矿产勘查开发局一一二地质大队  
宋继伟 贵州省地质矿产勘查开发局一一二地质大队  
王虎 贵州地质工程勘察设计研究院  
李勇2 贵州地质工程勘察设计研究院  
代云鹏 贵州省地质矿产勘查开发局一一五地质大队  
基金项目:贵州省科技支撑计划项目“多分支定向井钻进技术在贵州省煤系地层‘三气共采’中的研究及应用”(编号:黔科合支撑\[2018\]2195);贵州省地矿局地质科学研究项目“贵州省煤层气井套管-地层一体化胶结防水窜技术研究”(编号:黔地矿科合\[2018\]26)
中文摘要:井壁稳定性问题对黔西南地区煤系气的勘探开发效果至关重要。对泥页岩和煤岩井壁失稳的机理进行了分析,从化学、力学和化学与力学耦合等方面,探讨了煤泥互层段井壁失稳的对策。结合黔西南地区煤系地层煤层气井的实例,分析了井壁失稳对井径大小及岩心采取率的影响,发现煤泥互层段的井径扩大率较大而相应的岩心采取率较小。尽可能准确地预测探井的地层压力、选用合理的钻井液体系和密度、采用合理的钻井工艺有助于维持黔西南地区煤系地层井壁稳定。
中文关键词:黔西南地区  煤系地层  煤层气井  井壁稳定性  地层压力  井径扩大率  钻井液体系
 
Wellbore stabilization techniques incoal-bearing formation in Southwestern Guizhou
Abstract:Maintaining wellborestabilityinunconventionalgas wellsis muchimportanttotheexplorationand productionofnaturalgasincoalGbearingformationinthesouthwesternregionofGuizhouProvince.Thispaper investigatesthewellborefailuremechanismincoalandmudshaleformation,andfindsoutthatthetwokindsof wellborefailuremechanismsareessentiallydifferent.Inaddition,solutionsforwellboreinstabilityareinvestigated intermsofchemistry,mechanicsand mechanicscoupled withchemistry.Influenceof wellboreinstabilityon wellGradiusvariationsandcorerecoveryisanalyzedinthecontextofaCBM wellinZhinaCoalfield,leadingtothe findingthatwellboreenlargementisgreaterwithlowercorerecoveryoverthecoalGmudstonesection.Predicting accuratelytheformationpressuresofexploration wells,optimizingthedrillingfluidsystem anddensity,and choosingtherightdrillingtechniquescontributetoCBM wellborestabilityinthesouthwesternregionofGuizhou Province.
keywords:SouthwesternregionofGuizhouProvince  coal-bearingformation  CBMwell  wellborestability  formationpressure  wellboreenlargementrate  drillingfluidsystem
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