针对页岩地层油基钻井液漏失频繁且严重、常规堵漏技术效果不佳的难题,研制了一种油基高滤失承压堵漏剂。开展悬浮稳定性、滤失时间、初始强度、承压能力和钻井液适配性评价实验,分析了油基高滤失承压堵漏剂的特性及堵漏原理,探讨了油基高滤失承压堵漏工艺及其现场应用效果。研究表明:油基高滤失承压堵漏剂由纤维、多孔惰性材料、渗滤性材料、助滤剂按特定比例均匀混合而成,配制的堵漏浆悬浮稳定性好,全滤失时间小于50 s,固化体初始强度高,150 ℃下快速滤失性质稳定,承压能力为10.0~19.0 MPa,钻井液适配性好。现场应用效果显示,油基钻井液高滤失承压堵漏技术工艺简便安全,油基钻井液适应性强、承压能力高,适用于油基钻井液小型、中型、大型漏失和水基钻井液强水敏泥页岩地层漏失。该研究为页岩地层油基钻井液承压堵漏提供了一种新的技术解决方案。
For the issue of frequent and severe oil-based drilling fluid losses in shale formations and the ineffectiveness of conventional plugging methods, an oil-based high filtration loss pressure-bearing plugging agent has been developed. Tests on its suspension stability, filtration time, initial strength, pressure-bearing capacity, and compatibility with drilling fluids were conducted. The properties and plugging mechanism of the agent were analyzed, along with its application process and field performance. The study shows that the oil-based high filtration loss plugging agent is a uniform mixture of fibers, porous inert materials, infiltrating materials, and filter-aids in specific proportions. The formulated slurry has good suspension stability, a total filtration time of less than 50 seconds, high initial strength of the solidified body, stable rapid filtration properties at 150 ℃, a pressure-bearing range of 10.0 to 19.0 MPa, and good compatibility with drilling fluids. Field application results show that this technology is simple and safe in operation, with strong adaptability of the oil-based drilling fluid and high pressure-bearing capacity. It is suitable for plugging small, medium, and large-scale losses in oil-based drilling fluids, as well as for addressing leakage in water-sensitive shale formations using water-based drilling fluids. This study offers a new solution for plugging the oil-based drilling fluid loss in shale formations.
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