Wellbore stabilization techniques incoal-bearing formation in Southwestern Guizhou

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Wellbore stabilization techniques incoal-bearing formation in Southwestern Guizhou
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Affiliation:1.GeologicalTeam115,BureauofGeologyandMineralExplorationandDevelopmentofGuizhouProvince,QingzhenGuizhou551400,China;2.GuizhouGeologicalEngineeringInvestigationDesignandResearchInstitute,GuiyangGuizhou550008,China;3.GeologicalTeam112,BureauofGeologyandMineralExplorationandDevelopmentofGuizhouProvince,AnshunGuizhou561000,China
Clc Number:P634
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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．

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Received:October 29,2018
Revised:May 15,2019
Adopted:May 16,2019
Online: July 23,2019
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