Design and Testing of Double-Piston Driven Inside Cutter of Small-Diameter Tubing for Workover
In order to solve the problems of low cutting efficiency and unstable pressure of inside cutter of small-diameter tubing in workover operation,the structure of double-piston driven inside cutter of small-diameter tubing was proposed.The structure and working principle of the tool were introduced,the key structures such as double pistons and cutters were designed,and mechanical simulation analysis was carried out on the cutter body to study the stress situation of its key parts.Finally,ground tests were conducted to verify the performance and appli-cation effect of the double-piston cutter.The results show that the maximum stress at the root of the thread is 225 MPa,the maximum stress at the installation position of the cutter is 212 MPa,the stress at the threaded hole is 206 MPa,and the maximum stress at the piston contact surface is 159 MPa.The overall stress distribution on the cutter body is relatively uniform.The duration for a single piston to cut an ø73.00 mm tubing is 269 s,and 181 s for double pistons,reduced by 32%in cutting time.The double-piston cutter has light wear,and the cutting surface of the tubing is smooth and flat.The test results show that the cutting efficiency and stability of the double-piston driv-en cutter have been obviously improved.The research results provide theoretical and technical support for cutting operations of tubing on workover sites.
万方数据
维普
