Siheng Feng1, Dejun Zhang1, Desheng Yue2,3This email address is being protected from spambots. You need JavaScript enabled to view it., Yucai Shi2,4, Chenglin Fu2,5
1CNPC Chuanqing Drilling Co. Ltd., Guanghan, Sichuan 618300, China
2School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
3COSL Oilfield Technology Research Institute, Langfang, Hebei 065201, China
4Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum-East China), Ministry of Education, Qingdao, Shandong 266580, China
5Petroleum Engineering Technology Research Institute, Sinopec Jiangsu Oilfield Company, Yangzhou, Jiangsu 225009, China
Received: December 1, 2022 Accepted: June 4, 2023 Publication Date: August 25, 2023
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Rotary steerable system (RSS) is the most advanced and representative directional drilling system. The static push-the-bit RSS relies on three steerable ribs to support on the wellbore wall to provide steering force. The wellbore wall may yield and plastically deform due to the pushing force from the steerable ribs. The finite element method is used to simulate the process of the steerable rib falling into the wellbore wall while drilling ahead. The factors that may affect the wellbore deformation and failure are analyzed. It has proved that single-plunger articulated steerable rib has smaller contact area due to the angular contact with the wellbore wall, resulting in uneven contact stress distribution with the maximum stress located at the front end and a significant increase at the crater of the steerable rib; rock mechanical parameters (elastic modulus, cohesion and internal friction angle) of wellbore wall have enormous influences on the wellbore wall deformation and failure. If the wellbore wall is soft, single-plunger articulated steerable rib will fall into the wellbore wall, and the immersion depth increases approximately linearly with the loading time; the risk of steerable rib falling into the wellbore wall can be reduced by appropriately reducing the pushing force or increasing the curvature radius of the steerable rib.
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