Experimental Study on Spiral Cutting and Winding and Taking Out Method of Surface Casing in Oil and Water Wells

This paper focuses on the new sleeve - taking technology of oil and water Wells. On the basis of breaking through the traditional sleeve milling and milling technology, the spiral cutting is the main means to make full use of the space inside the pipe, and the casing is wound and removed as a whole. The main methods and steps areas follows: screw pitch and cutting. Angle are calculated according to the force; plasma cutting machine is used to cut the casing helically; fixed-point connection of the casing collar is carried out to expand the sleeve; after the casing is formed as a whole, the ground mechanical equipment is used to lift the end of the casing vigorously, so that each casing can be taken out as a whole. This technology breaks through the traditional technology and overcomes the accidents such as large diameter of casing pipe, large friction resistance, easy to drop block and stuck drill, etc. By calculating reasonable pitch and cutting Angle, the surface casing can be cut smoothly with plasma cutting machine. This process has been carried out in the laboratory to simulate the spiral cutting sleeve experiment, the relevant data provided a strong evidence for the field. The innovation point of this process is: inspired by the reverse use of spiral welded pipe forming principle, spiral cutting of casing, fixed-point connection, integral sleeve taking method, can effectively shorten the construction period, reduce underground accidents.