A TECHNIQUE FOR DIAGNOSIS OF WORKING CONDITIONS OF HYDRAULIC PISTON PUMP

Hydraulic piston pump supplies energy for the lift of downhole liquid by the hydraulic pressure.For many years,the working conditions of downhole pump is experientially diagnosed by analysing the wellhead pressure variation,which lead to a larger error in diagnosis results,and then influences the oil production.Based on the motion law of hydraulic piston pump,this paper introduces a new method for the diagnosis of working conditions,which determines the working conditions of downhole pump by comparing the variation law of wellhead pressure and flowrate of power fluid with them,which is gathered and recorded by a portable computer,with the plots of typical working conditions.The oilfield management level has been improved by applying this method.