Design and Analysis of the Hydraulic System of Sidewall Coring Tool with In-Situ Measurement

Abstract

AbstractAiming at the problem of inaccurate core parameter measurement due to the inability of conventional sidewall coring tool to measure cores in real time, a new type of sidewall coring tool with in-situ measurement function was designed.The whole structure of the coring tool was introduced which consists of a drilling system and a switching system. Because the coring tool is powered by hydraulic system, the hydraulic control system was designed. The hydraulic system includes a coring module, a switching module, a pushing module, and an in-situ measurement module. The static and dynamic characteristics of the drilling control valve were analyzed. The hydraulic system of the switching module has been improved by adding a safety valve, a two-way throttle valve, and a superimposed relief valve to stabilize the inlet pressure of the switching hydraulic cylinder and avoid oscillation.A simulation model of the hydraulic system is established based on software AMESim. Simulation results show that the drilling hydraulic cylinder moves 29 mm in 0–10 s and 150 mm in 10–20 s. The input pressure of the hydraulic cylinder of the switching circuit is stable at 1.68 MPa, and the flow rate is 10.48 L/min. There is no pressure fluctuation and the piston rod moves smoothly. So the rationality and reliability of the hydraulic system design are verified.The innovation of this article lies in the design of the structure and hydraulic control system of a new type of sidewall coring tool. Through designing the structure of the drilling control valve and improving the hydraulic circuit of switching module, the sidewall coring tool can work reliably and smoothly. This research is of great significance to the application of the sidewall coring tool in the oil well.KeywordsRotary sidewall coring toolIn-situ measurementHydraulic systemAMESim