Compensation Method for Flow Rate Dead-zone of Formation Dynamic Tester
The formation dynamic tester plays an essential role in petroleum exploration.The core function is to analyze the formation permeability by its pre-test chamber.Since petroleum explorations progressively extend to ultra-deep wells,occurrence of dead-zone phenomena in the electro-hydraulic system of the pre-test chamber has intensified.Therefore,it is urgent to conduct numerical analysis to determine its performance defects.This paper first introduces the composition and characteristics of the studied electro-hydraulic system.Secondly,the dead-zone of flow rate is analyzed by a Simulink-AMESim cosimulation model.Furthermore,the dynamic compensation method is proposed and verified in simulation.The results illustrate that this method can effectively address the performance detects caused by the high temperature of downhole environment thereby improving the operation stability of the formation dynamic tester.