Simulation and Field Studies on an Innovative Downhole Machine Designed for Ultrashort-Radius Horizontal Well Drilling Engineering
Author:
Li Chenglong,Chen Zongtao,Wang Zenglin,Tian Qizhong,Dai Rongdong,Wang Kun
Abstract
Ultrashort-Radius Horizontal Well (URHW) drilling engineering plays an important role in increasing the recovery factor of old oilfields. By sidetracking old wellbores at a very high build-up rate, the URHW can effectively exploit the residual oil near old wellbores. Currently, the main problem faced in URHW drilling engineering is the reduced torque received by drill bits owing to the increased friction between the flexible drilling assembly and wellbore as the horizontal section extends, which greatly limits oil production from a single trip. To tackle this problem, we proposed an innovative machine design, a Dynamic Flexible Drill Rod (DFDR), to provide extra torque near the drill bit to extend the horizontal section of the URHW. The interior structure and working principle of the DFDR were illustrated. The mechanical properties of the DFDRs critical load-bearing part were examined via simulation. The torque and pressure loss characteristics were analyzed using computational fluid dynamics. Corresponding modifications were made to optimize the design, with model machines produced accordingly. Field trials were carried out based on old wellbores in Chunliang District, Shengli Oilfield. The DFDR-based technique extended the URHWs horizontal section in this area by 13.38% on average.
Subject
Electrical and Electronic Engineering,Industrial and Manufacturing Engineering,Control and Optimization,Mechanical Engineering,Computer Science (miscellaneous),Control and Systems Engineering
Reference22 articles.
1. Bruni, M., Biassotti, H., and Salomone, G. (2007, January 15–18). Radial drilling in Argentina. Proceedings of the 2007 SPE Latin American and Caribbean Petroleum Engineering Conference, Buenos Aires, Argentina. 2. Dickinson, W., Sykstra, H., Nees, J.M., and Dickinson, E. (April, January 30). The Ultrashort Radius Radial System applied to thermal recovery of heavy oil. Proceedings of the Western Regional Meeting, Bakersfield, CA, USA. 3. Stiles, E.K., DeRoeun, M.W., Terry, I.J., Cornell, S.P., and DuPuy, S.J. (1999, January 21–22). Coiled tubing ultrashort-radius horizontal drilling in a gas storage reservoir: A case study. Proceedings of the 1999 SPE Eastern Regional Meeting, Charleston, WV, USA. 4. Abdel-Ghany, M.A., Siso, S., Hassan, A.M., Pierpaolo, P., and Roberto, C. (2011, January 23–25). New technology application, radial drilling petrobel, first well in Egypt. Proceedings of the 10th Offshore Mediterranean Conference and Exhibition, Ravenna, Italy. 5. Liu, C., Song, X., Xu, X., Zong, H., and Guo, Y. (2022, January 9). Adaptability analysis of ultra-short radius sidetracking horizontal well technology. Proceedings of the International Field Exploration and Development Conference, Singapore.
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