Design and Simulation Study on Continuous Circulation Valve Drilling System

Abstract

Continuous circulation valve (CCV) drilling is an important form of continuous circulation drilling (CCD), whose key technology lies in the design of CCV. In this paper, a T-type integrated triple valves is designed and developed, which integrates the by-pass pressure relief valve and the main channel three-way ball valve in the same principal axis section. The CCV can be switched up and down and bypass through manual adjustment mechanism, which achieves the switch between normal circulation drilling and bypass circulation drilling. In order to verify the rationality of the design, ABAQUS software is used to analysis the situation with different tension, pressure, bending, twist, internal pressure and external pressure. The result confirmed that the overall strength met the requirements. So as to analyze the feasibility of manually rotating hexagon wrench to adjust and switch the three-way valve, the maximum torque of T-type three-way valve is discussed by combining simulation analysis and numerical calculation, and the Switch t-type three - way valve can be realized manually. Further simulation verifies that the overall sealing is good of the three-way valve body valve when the three-way valve is opened and closed. The change of the diameter of T-type three-way valve causes the acceleration of liquid flow rate and the increase of mud internal pressure, which has certain iMPact on the three-way body. Generally, the three-way body has no influence on the flow flux of mud in the whole drill pipe. Finally, it is verified through field application that the T-type integrated three-way valve design is reasonable, and the simulation and calculation analysis reach the expected goal.