Drill String Torque Signal Detection for Stuck Pipe Analysis

The stuck pipe is one of the most important problems that it is costly and time consuming in drilling. Studies show that the parameters such as torque and the structure of the ground during drill operation are effective in the stuck pipe. Experience has shown that the torque suddenly rises in the moment of stuck, and drill bit rotates (rotation per minute RPM) get more slowly. Because this approach has many weaknesses with regard to the possibility to human mistakes and lack sufficient precision, thus, by detecting torque and rotation per minute spikes, the stuck moment can be detected. Various methods have been introduced to spike detection in the proposed method. In addition, smooth nonlinear energy operator is used. In this method, signal is detected positive and negative changes. In this study, a method for the detection of positive spike for torque and negative spike for RPM has been introduced. Moreover, it has been shown that the suggested method needs less time for analyzing a signal; therefore, it can be used in the immediately systems.