负压脉冲射流洗井机理研究硕士论

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1、中国石油大学（华东）硕士学位论文负压脉冲射流洗井机理研究姓名：贾学臣申请学位级别：硕士专业：油气井工程指导教师：杨永印20080401摘要油井在采油生产过程中，油井炮孔出现的各种堵塞物严重影响油井的正常生产。负压脉冲射流洗井技术可以有效清除炮孔堵塞，起到增产增注效果。本文理论和实验相结合对负压脉冲射流洗井过程中水力参数、振荡腔结构参数对压力脉动幅值的影响，以及脉冲波在堵塞炮孔中的传播哀减规律展开研究。为了研究负压脉冲射流的洗井机理，利用人造岩样模拟炮孔堵塞物，实验研究了负压脉冲射流的部分洗井机理，实验发现

2、：负压脉冲冲击可有效降低人造岩样强度；负压脉冲射流的负压对于提高人造岩样渗透率非常有利；脉冲幅值越大，对人造岩样的清洗效果越好；脉冲射流作用的时间越长，对人造岩样的清洗效果越好。根据工作原理，设计了负压脉冲射流清洗炮孔模拟装置，理论和实验研究了水力参数、振荡腔结构参数对负压脉冲射流脉动幅值的影响，实验发现：负压脉冲幅值随工具压降的增大而增大；负压脉冲幅值随振荡腔室体积增大而减小。利用炮孔填砂模拟堵塞程度，通过实验得到了负压脉冲射流在不同堵塞程度的炮孑L中压力波的衰减规律，堵塞越轻，负压波衰减越轻，其有效传

3、播距离越大。关键词：负压脉冲，洗井，振荡腔，机理StudyonMechanismofWellWashingwithNegativePressurePulseJetJiaXuechen(Oil&GasWellEngineering)DirectedbyAssociateProfessorYangYongyinAbstractDuringtheprocessofoilproduction，theboreholewallandshotholesmaydepositscale，saltandSOonwhichaf

4、fectstheoilwellsnormalproduction．Thetechnologyofwellwashingwithnegativepulsepressurejetcanimprovetheblockingoftheshotholesinoilwells．Itcanstimulatetheoilwellproductionandtheinjection；increasethebenefitoftheoilfield．Thispapertheoreticallyandexperimentallya

5、nalyzetheeffectofhydraulicparametersofthenegativepressurepulsejetandthestructureofoscillatorontheamplitudeofnegativepulse，andthediffusingcharacteristicsofthenegativepressurepulseintheblockedperforation．Inordertostudythemechanismofwellwashingwithnegativepr

6、essurepulsejetting，useofartificialrocksimulatedholesediment，manydifferentexperimentsweredesigned，andtheresultshowsthattheimpactofnegativepulsecaneffectivelydecreasetheintensityofthestemming；thenegativepressureisveryavailabletothepermeabilityimprovingofthe

7、blockedperforation；thegreaterthepulseamplitudeandthelongerthecleaningtime，thebetterthecleaningeffect．Thesimulationexperimentsoftheperforationcleaningwithnegativepressurepulsejetweretaken．Andtheeffectofthehydraulicparameters，thestructureparametersofoscilla

8、torandthecharacterofshotholesblockonthepulseamplitudewasstudied．Theresultsshowthatthepressureattheentranceofthenegativepressurepulsejetmodulatorandthedecreaseoftheambientpressure．Bysandsfillingtosimulatethepluglevel