Research On Multi-Parameter Monitoring Technology For Electrical Submersible Pump In Down-hole

Electrical Submersible Pump(ESP)has high efficiency and easy to realize intelligent,as to ESP possesses many other advantages,make it rapidly development in recent years,it's application promote usage from ocean oil wells to land.something about ESP down-hole monitoring system research also becomes a hot issue and front-subject at internal and overseas in recent years.The development of complete monitoring system equipment in ESP includes underground monitoring instrument and ground system.Down-hole monitoring instrument articulated in three-phase asynchronous motor of ESP,by building the ground of the artificial star and down-hole ESP of three-phase motor winding star,constituting based on principle of three-phase star equipotential direct current channel supplies power from ground system to underground monitoring instrument.Down-hole monitoring instrument in many parameters such as temperature,pressure,vibration monitoring circuit,acquiring information relate to the motor running state,after conditioning obtained various parameters,down-hole circuit signal is converted a current signal,multi-channel time-sharing choose switch can select circuit connecting the current-loop.The current-loop circuit consisting of three-phase armored cable metallic armor of ESP and star of ground.The ground system is supplying the power to under ground,bying time-sharing choose circuit of down-hole monitoring instrument acquire multi-parameter signal,signal is time-sharing transmitted to ground data collecting processing unit.Comprehensive processing with analogue to digital,operation,storage,make the ground system and down-hole monitoring instrument work harmoniously.Theoretical analysis and a large number of experiments certificates that the power supply way of multi-parametes ESP monitoring system is simple,transmits to the ground of current signal is stable,the function of ground data processing instrument is comprehensive,the system of equipment provides the technical support for long-term reliable works of ESP.Monitoring system makes the staff informed that down-hole working conditions timely,provides the reference of the optimization of oil recovery and adjustment of recovery scheme,provides support of based on reservoir dynamic monitoring and reservoir protection of ESP.