The invention relates to the technical field of special plugging agents for oil-based drilling fluids, in particular to a high-
filtration pressure-bearing plugging agent for oil-based drilling fluids and a preparation method thereof.The high-
filtration pressure-bearing plugging agent for the oil-based drilling fluids is prepared from, by weight, 30-40 parts of bridging supporting materials, 10-15 parts of
fiber materials, 40-50 parts of
filling materials and 5-10 parts of filter aids, and uniformly mixing the required amounts of the bridging support material, the
fiber material, the filling material and the filter aid to obtain the high-
filtration pressure-bearing plugging agent for the oil-based
drilling fluid. The preparation method is simple and convenient, the
filter material is prepared by mixing various materials such as the bridging supporting material, the
fiber material, the filling material and the filter aid,
solid-phase particles are small in size and can easily enter leakage channels and spaces with various opening sizes, rapid filtration is performed under the action of
pressure difference, and the more serious the leakage is, the faster the leakage speed is and the faster the filtration is. Therefore, the plugging agent is wide in application range, simple in plugging construction, high in safety, quick in effect and low in cost.