Yu Liu1,2, Qingshan Xiong1,2This email address is being protected from spambots. You need JavaScript enabled to view it., Rong An1,2, Hao Geng1,2, JiaHuan Xu1,2
1Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering (Yangtze University)
2School of Petroleum Engineering, Yangtze University: National Engineering Research Center for Oil & Gas Drilling and Completion Technology
Received: April 11, 2023 Accepted: July 12, 2023 Publication Date: September 28, 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.
To address the serious issues of leakage, challenging plugging, and significant friction related to the long horizontal section construction in the Fuling shale gas field, a study was conducted to develop a suitable leak-proof agent OBMCP for oil-based drilling fluid. The difficulties of preventing leakage and plugging oil-based drilling fluid were analyzed, and the amount of reactively consolidated polymer HY-1 was controlled at 6.25 – 7.5% while considering the plugging strength requirements and plugging costs. The enhancer ZQJ was controlled at 0.4 – 0.6% to achieve high-strength rapid plugging, and the gelation time was controlled under the premise of safe construction to achieve a controllable curing time. Consequently, the oil-based drilling fluid leakage prevention and plugging technology were formed and applied in the J1 and J2 wells. The field test showed that the optimized drilling fluid had stable performance, a good plugging effect from the consolidation plugging agent, a stable borehole wall, small leakage, and strong anti-pollution ability, thereby achieving high-strength rapid plugging and a controllable curing time.
Keywords: Oil-based drilling fluid; plugging while drilling; consolidation plugging agent; wellbore instability; fuling shale gas
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