高压水射流钻扩孔技术在井下煤层气开采中的应用研究(3)

2021-01-20 23:05

煤层气储层特征,开发开采技术和工艺

ApplicationResearch

HighPressureontheDrillingandChamberingTechniquewithWaterJetinUndergroundCoalbed

andNaturalGasMethaneDrainageLinFujin(PetroleumEngineering)

WeidongDirectedbySeniorEngineerZhou

researchprofessorSunDongling

Abstract

Thecoalandgasoutburst,whichis

coalmining,isaakindofseriousprojectdisasterintheprocessofmajorproblemthaturgentlyneedstobesolvedtoguaranteethecoalminesafetyinproduction.Thebasicmeasuretocontrolcoalandgasoutburstisgasdrainage,buttheconstructionofdrillingholesisstillthedifficult

usingthedrillingbitofprojectproblemuntilnOW.However,higllpressurewaterjetto

aCarryouttheconstructionofddll吨holes

newwayandchamberingofgasdrainagehasgreatsuperioritywithwhichthetraditionalmechanicalcandrillingbitisunabletocompare.Thistechnique

technicalapproach.

Fluidbestudiedde印lyasaandMechanics,JetMechanics,ImpactDynamics,andotherrelatedtheoriesandmethodswereusedforanalyzingthedesignvaluesofthedrillingandchamberingtechnique谢廿1lli曲pmssurewaterjet.Inthisdissertation,theauthorexploredthestructuralcharacteristicsofhighpressurewater

referredinthecoal

lawsonjet,pointingoutthejetproblemsofjetdrillingholesflowproblems.Theoftheturbulentbedareessentiallytheturbulentimpactjetofchangingflowarestructureofdrainagearea,velocityandpressureaxesjetexploited,gettingthechanginglawsofflowfieldinboring.'WllendrillingholesinCoalseam,turbulentimpactbasinofhigh-pressurewaterjet

areacailbedividedintofreejetarea,theimpactandthewallarea.Theaxesvelocityofturbulentimpactjethasdifferentattenuationlawsindifferentareas.Takingthetheorystudyofthehighpressurewaterjetand

jetthenumericalsimulationresearchresults锻the

drilling

allfoundation,,threetypesofbitsthatareoptimalforandcharnbefingincoalbedweredeveloped,theseainclude:animpellerrotaryjetbit,offsetauto-rotaryjetbit,andchamberingjetbit.Thedevelopedbitsofjetdrillingweretakenintothetestofdrillinginthecoal—bedofXinzhuangziCoalMine.Theexperimentindicatedthatthedevelopedoffsettypeauto—gyrationbitsandimpellertypegyrationbitshavewe.1labilitiesforbreakingcoalanddrillingefficiency.Thedevelopedhighpressurewaterjetbitswerealsousedforchamberinginthecoal-bedoftheSecondCoalMineofDatong,anda


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