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1、断块油气田第17卷第6期FAULT-BLOCKOIL&GASFIELD2010年11月769文章编号：1005-8907（2010）06-769-04火山岩复杂地层控压钻井技术应用杨世军1樊朝斌2彭刚2肖云峰1王海波1（1.长江大学油气钻采工程湖北省重点实验室，湖北荆州434023；2.西南油气分公司重庆钻井公司，重庆400042）摘要火山岩地层存在地层硬、研磨性强、岩石可钻性差和裂缝性漏失等客观条件，严重制约了火山岩的勘探开发。KLML气田前期钻探工作中，钻井遇到了3个突出难题：频繁井漏、机械钻速低、井壁容易失稳。常规钻井工艺已不能解决这些复杂情况同时存在的情况，造成钻井工艺在油气勘探上
2、的极大制约。控压钻井利用专用井口控制设备在井口产生一个回压，根据地层孔隙压力和地层坍塌压力等因素，精确调节节流阀的开启程度来改变井口回压的大小，从而改变井内钻井液当量密度的压力剖面。它具备防漏、防喷、提高机械钻速和防止井壁失稳等问题的技术优势，应用于KLML气田钻井实践证实：该方法在实践过程中有效防止了漏失和井壁不稳，同时较大幅度地提高了机械钻速。在复杂地层钻井中，控压钻井将成为不可缺少的重要手段。关键词火山岩地层；复杂地层；控压钻井；窄窗口；井漏；机械钻速中图分类号：TE249文献标志码：AApplicationofmanagedpressuredrillingtechniqueinco
3、mplexvolcanicrockformationYangShijun1FanChaobin2PengGang2XiaoYunfeng1WangHaibo1(1.KeyLaboratoryofOilandGasDrillingandProductionEngineeringofHubeiProvince,YangtzeUniversity,Jingzhou434023,China；2.ChongqingDrillingCompany,SouthwestOilandGasCompany,SINOPEC，Chongqing400042,China)Abstract:Theexploratio
4、nanddevelopmentofvolcanicrockformationaregreatlyrestrictedbysomeobjectiveconditions,suchashardformation,strongabrasiveporperty,poordrillabilityandfracturedleakage.Threeproblems,i.e.frequentcirculationloss,lowROPandboreholewallinstability,areencounteredduringearlydrillingoperationinKLMLGasField.Bec
5、auseconventionaldrillingtechnologycannotsolvethesecomplexsimultaneousproblems,thedrillingtechnologyofoilandgasexplorationhasbeengreatlyrestricted.Accordingtotheporepressureandcollapsepressureofreservoir,abackpressurecanbeproducedduringmanagedpressuredrillingthroughtheuseofspecialwellheadcontrollin
6、gequipmentsandthewellheadbackpressurecanbechangedbyadjustingtheopeningdegreeofchokevalve,whichcanchangethepressureprofileofequivalentcirculatingdensityofdrillingfluidwithinwell.Ithasthetechnicaladvantagesofleakprotection,blowoutcontrol,improvingROPandpreventingboreholewallinstability.Thedrillingpr
7、acticeinKLMLGasFieldprovesthatthemethodiseffectiveinleakageprotectionandpreventingboreholewallinstabilityandROPhasbeengreatlyimprovedatthesametime.Withthecomplexconditions,themanagedpressuredrillingwillbecomeanin
