Analysis of Bit Torque in Coiled Tubing Sidetracking

The production halts and casing failure problems,which are caused by formation factors and the quality of casing is better solved by coiled tubing side tracking technology. Based on the feature of coiled tubing side tracking,the reasonable tools are chosen,and the load on the bit is carefully analyzed. The curve of torque related to bit pressure is generated when drilling forward,programming is made by using Matlab. Through analyzing this curve,the reason of the change in torque is identified,which provides a theoretical basis for the choice of drilling pressure. This is very important in avoiding the dead lock or even the breaking down of drilling assemble of bit,it improves the efficiency of sidetracking window.