| 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,等.黔西南地区煤系地层井壁稳定技术探讨[J].钻探工程,2019,46(7):8-13,33.HAO Haiyang,LI Yong,SONG Jiwei,et al. Wellbore stabilization techniques incoal-bearing formation in Southwestern Guizhou[J]. Drilling Engineering, 2019,46(7):8-13,33. |
| 摘要点击次数: 1193 |
| 全文下载次数: 738 |
|
| 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 |
| 查看全文 查看/发表评论 下载PDF阅读器 |
