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