Improvement and Application of Electric Submersible Screw Pump in Shale Oil Horizontal Wells,Qingcheng Oilfield
Qingcheng Oilfield is the first discovered shale oil field with a capacity of 1 billion tons in recent years in China,and it is of great strategic significance to ensure national energy security to achieve scale benefit development.The three-dimensional horizontal well layout pattern of multiple well clusters on shale oil platforms results in complex wellbore trajectories.The conventional rod lifting process has prominent contradictions in pipe rod eccentric wear,with a pump inspection cycle of less than 200 days,and it is difficult to meet the demand for rapid fluid discharge in the early stage of large-scale volume fracturing development.Based on the requirements of"efficient wellbore lifting,full life cycle extraction,and digital transformation",the electric submersible screw pump lifting technology has been introduced.In response to the frequent problems of jamming,blockage,and unit fracture during the application process,the stator rubber material improvement,clearance optimization between the stator and rotor and unit strength upgradation were carried out,and the sand,wax,gas,scale prevention and control technology improved,greatly enhancing the process adaptability of the electric submersible screw pump in complex shale oil well conditions.By summarizing the electrical parameter curve characteristics of various faults,5 common fault diagnosis templates for electric submersible screw pumps were established,which solved the problem of difficult fault diagnosis.After the process improvements and supporting upgradation,the maintenance frequency of electric submersible screw pumps has decreased from 2.62 times/(well·year)to 0.60 times/(well·year),the production rate has increased from 97.5%to 99.2%,and the pump inspection cycle has been extended from 140 days to 480 days,achieving the mature application of electric submersible screw pumps.
NETL
NSTL
万方数据
