摘要
沧东凹陷孔二段页岩油储层属于特低孔、特低渗储层,泥质含量高,作业过程中极易因压井液等外来流体侵入造成污染。针对这一问题,对页岩油井常用的有杆泵、电动潜油泵举升工艺及其生产管柱和井下工具进行优化设计,形成了由预制内防喷工具不压井作业技术、可控桥塞暂闭井筒完井技术和敷缆连续油管带压下泵技术等组成的沧东凹陷页岩油水平井不压井作业技术。现场应用结果表明,不压井作业技术可以解决有杆泵井内衬油管无法有效密封、电动潜油泵井无法带压作业等问题,作业后储层零污染,无需等待完全泄压结束再下泵投产。
The shale oil reservoir in the Kong-2 member of the Cangdong Sag has ultra-low porosity,ultra-lowpermeability and high shale content,and thus,it is prone to be contaminated by invasion of fluids including killing fluidduring operations.Regarding this problem,the sucker rod pumps,the lift technology of electric submersible pumps,andthe associated production string and downhole tools commonly used in shale oil wells were optimized.Then,thetechnologies for snubbing services in the horizontal shale oil wells in the Cangdong Sag were formed with snubbingservice with prefabricated inner blowout preventers,completion with controllable bridge plugs that can temporarilyclose wellbore,and under-pressure pumping-down operation with cable-laying coiled tubing.Field applications showedthat this technologies could successfully address the problems such as lined tubing sealing failures of sucker rod pumpsand under-pressure operation failures of electric submersible pumps,etc.After the operations,the reservoir was notcontaminated and the pumping-down operation were free from waiting for complete pressure relief.
作者
王栋
赖学明
唐庆
周俊杰
WANG Dong;LAI Xueming;TANG Qing;ZHOU Junjie(Oil Production Technology Research Institute,Petrochina Dagang Oilfield Company,Tianjin,300280,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2021年第4期150-154,共5页
Petroleum Drilling Techniques
关键词
页岩油
水平井
不压井作业
防止地层损害
沧东凹陷
shale oil
horizontal well
snubbing services
formation damage prevention
Cangdong Sag
