Improved Progressive cavity wellbore pump for use in artificial lift systems

摘要

An artificial lift system used to produce fluids from boreholes such as oil and gas wells. The system uses a progressive cavity (PC) downhole pump system which can be inserted into the borehole, seated, operated, flushed and removed using conventional or coiled sucker rod tubing. No special tubing is required to radially anchor the PC pump to the tubing. The PC pump system has improved flushing capabilities which reduces the length of the system. The system is lest costly to manufacture and to maintain than prior art PC pump systems. The pump can be relocated without pulling tubing. Different displacement volumes and lifts can be substituted in existing installations without major changes to equipment installed in the tubing string.