Development and application of testing apparatus for surface drive screw pump wells

More and more screw pumps are being applied to oilfield,however,there still exist certain differences between it other general artificial lift methods in stability,reliability,and perfectness of matched technology.So a more convenient and feasible approach is needed to diagnose the pump operation.The development of screw pump comprehensive testing apparatus fulfills the need.It is based on based on single-chip microcomputer of MCS51 series.Synchronous or separate measurement will be achieved by regulating,receiving,and collecting signals through the serial communication of the single-chip microcomputer,as well as testing the polished rod torque,axial force,rotation speed,three-phase current,three-phase voltage,tubing head pressure etc.through the wired and wireless transmission mode.The new apparatus features in high accuracy,high sensitivity,and strong anti-disturbance,etc.,After being applied to more than 300 wells,it is found that the testing data are exact and reliable,with the successful ratio being more than 95%.This provides provide reliable basis for the working condition diagnosis and optimization of screw pump wells.