×

An adaptive toolface control method for slide steering drilling. (Chinese. English summary) Zbl 1449.93155

Summary: In the process of slide drilling, the friction between the drill string and the wellbore is so large that it takes long to implement the tool-face adjustment which is very important to change the current well-bore trajectory. In addition, it is not clear in theory how to adjust the tool face correctly and efficiently, which results in that the tool face adjustment mostly depends on the driller’s experience and is very inefficient. In this paper, a simplified transfer function model which describes the tool face adjustment process is proposed. Based on this model, the differential positive feedback control algorithm is used to improve the response speed of toolface adjustment, and an adaptive method is established to identify and correct the parameters of the control model in real time. Finally, the results of the dynamic simulation show the correctness and robustness of the proposed control algorithm which can increase the dynamic response speed of the tool-face adjustment without overshoot or steady-state error. The parameters of the control algorithm are automatically identified and corrected without the driller’s experience.

MSC:

93C40 Adaptive control/observation systems
93B52 Feedback control
PDFBibTeX XMLCite
Full Text: DOI