Research and Application of Full-life Cycle Wellbore Prevention and Control Technology in Horizontal Wells,Longdong Shale Oil
The wellbore environment of Longdong shale oil horizontal wells is complex with problems such as eccentric wear,waxing,scaling,sand production,and gas impact.The conventional reservoir wellbore technology is not suitable,and the frequency of workover is as high as 1.49 times per well per year,seriously affecting normal production.Based on the workover situation,analyzing high failure factors,a series of important tools and materials such as scale inhibitors,oil tubing with internal anti-wax coating,and integrated tool for cyclone sand flushing+jet+descaling are invented,and several key technologies like bi-directional anti eccentric wear design of rods and pipes,efficient sand flushing and unblocking of long horizontal wells are formed.A full life cycle prevention and control technology system for wax,scale,gas,sand,and grinding is established.After treatment,the frequency of workover decreased by more than 50%,and the oil recovery rate increased by 3 percentage points.A valuable reference have been provided for efficient lifting of similar shale oil complex wellbores in China.
shale oilhorizontal wellswellbore prevention and control technologyOrdos Basin
NETL
NSTL
万方数据
