井底直接调制式脉冲粒子射流性能分析与优化

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1、PerformanceAnalysisandOptimizationofTheParticlePulseJetDirectlyModulatedinBoSomHoleMaLin(Oil&GasWellEngineering)DirectedbyProfessorNiHong-jianAbstractAsthedepletionofshallowlayeroilandgasresources，findingoilandgasindeepandhardformationhasbecomethepoilltofcurrentlyexplorationa

2、nddevelopment,andthekeyproblemistheimprovementofde印wellpenetrationrate．Thepulsedwaterjetdrillingtechnologysuck-inannulusfluidsisproposedtotakefulluseofthebottom-holehydraulicpowerandpromotetherockbreakingefficiency,andexploretheperformanceanalysisandoptimizationmethodwithboth

3、importanttheoreticalandpracticalvalue．Firstly,pulsedjetdirectlymodulatedbottomparticleisproposedbasedontheideaofpulsedparticlejet,completedtheprinciplesofdesignofmatchingmodulatedjetdrillingtoolwhichisself-excitedpulsedjetsuck-inannulusfluidsdrillingt001．Themodulationmechanis

4、misobtainedbyanalyzingtheflowcharacteristicsoftwo-phaseflowfield．Andalsofoundthatmodulationtoolcanbeachievedtopicalnegativepressuretolettheannularparticlesintomodulatethepulsedparticlejet，nomatterhowtheconfiningpressure，particlesizeandparticledensityparametervariation,demonst

5、ratethefeasibilityoftheprincipleofmodulatio．ntools．Secondly,heLES(1argeeddysimulation)numericalanalysismethodisadaptedtoanalyzeflowtransientandfluctuationcharacteristics，theresultsshowedthatthisjetmodulationtoolcanbeinhaledparticlesintoannularchamber,andmodulatedcontinuousjet

6、intopulsedjet,andthestructuralparameterstakesignificanteffectontherippleeffect．Then，developedaprototypetoconductedexperimentsofrockbreakingbasedontheresultsofthelargeeddysimulation，analyzetheeffectofs位ucturaIparameterschangeontherock-breakingperformanceoftheparticlepulsedwate

7、rjet．ItWasfoundthatthebiggertheoutletvelocityoftheoscillationcavityis，thebettertherock-breakingeffectcouldbeobtained，andthereisagoodlinearcorrelationbetweenthem，andthereisapoorcorrelationbetweenotheroscillationcavityandrock-breaking．Finally,themulti·factoromlogonalsimulatione

8、xperimentshavebeendoneandthepulsedstructurehasbeenoptimizedaccording