High-filtration-loss plugging agent specially used for oil-based drilling fluid

Abstract

The invention discloses a high-filtration-loss plugging agent specially used for oil-based drilling fluid. The high-filtration-loss plugging agent is prepared from, by weight, 5-10 parts of fiber, 40-70 parts of a porous inert material, 10-25 parts of a percolating material and 5-10 parts of a filter aid; the porous inert material is a mixture of ceramic powder with the particle size of 180 meshesand ceramic powder with the particle size of 250 meshes, and the weight ratio of the 180-mesh ceramic powder to the 250-mesh ceramic powder is (4-6): (3-5); the percolating material is a mixture of zeolite powder with the particle size of 100 meshes and zeolite powder with the particle size of 150 meshes, and the weight ratio of the 100-mesh zeolite powder to the 150-mesh zeolite powder is (2-4):(4-7); the fiber is polyamide fiber, the length-diameter ratio is 5-50: 1, and the diameter is 0.5-15 microns; the filter aid is lime powder with the particle size of 200 meshes. The above componentsare uniformly mixed to obtain the high-filtration-loss plugging agent specially used for oil-based drilling fluid. The plugging agent disclosed by the invention is prepared by mixing various materials such as the fiber, the porous inert material, the percolating material and the filter aid, and is wide in application range, simple in plugging construction, high in safety and quick in effect.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling engineering, in particular to a special high fluid loss plugging agent for oil-based drilling fluid. Background technique [0002] In recent years, shale gas development has developed rapidly in China. However, in view of the stability of shale formations, most shale gas drilling currently uses oil-based drilling fluid systems. Therefore, oil-based drilling fluid systems are used in shale gas drilling. It can be popularized and applied in a large area. The main feature of shale formations is the widespread development of micro-fractures and induced fracturing to cause leakage. However, during the use of oil-based drilling fluid systems, oil-based drilling fluid leakage often occurs. Due to the high cost of oil-based drilling fluid preparation, the loss of oil-based drilling fluid will inevitably cause a lot of material waste, delay the drilling cycle, and cause huge economic losses. Th...

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Problems solved by technology

Rapid fluid loss plugging agent is popular in the field for its convenient use, quick effect, high success rate, and wide application range, but it can only be used for water-based drilling fluids, and there is no special high fluid loss plugging agent suitable for oil-based drilling fluids. Leaked dose

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