A preparation method of calcium chloride-based water-soluble oilfield temporary plugging material

Abstract

The invention relates to the technical field of preparation of oilfield auxiliary agents, particularly to a preparation method of a calcium chloride-based water-soluble oilfield temporary plugging material. The method sequentially comprises the following steps: preparing a calcium chloride saturated solution; heating the calcium chloride saturated solution, adding polyvinyl alcohol into the calcium chloride saturated solution, and uniformly stirring to form a colloidal adhesive; granulating the binder to form spheres; drying and cooling the spheres to room temperature to obtain anhydrous spherical calcium chloride; mixing polyethylene wax and a phenolic resin, and then heating; raising the temperature until the mixture begins to melt, and adding the anhydrous spherical calcium chloride; continuously heating until the mixture is completely molten into a colloidal state, and uniformly stirring to enable the phenolic resin to completely coat the anhydrous spherical calcium chloride; and taking out the coated anhydrous spherical calcium chloride, drying, and cooling to room temperature to obtain the temporary plugging material. The temporary plugging material can satisfy temporary plugging in the oil extraction process, does not pollute the environment, can implement controllable degradation under certain conditions, and enhances the recovery ratio of the oil field.

Description

technical field [0001] The invention relates to the technical field of preparation of oilfield additives, in particular to a preparation method of a calcium chloride-based water-soluble oilfield temporary plugging material. Background technique [0002] Temporary plugging material, also known as diverting agent, is a special treatment material researched and invented in oilfield exploitation, and now it has been maturely and widely used in field construction operations of oilfield exploitation. Because it has the plugging and unplugging performance of oil well fractures at the same time: the gel composed of temporary plugging materials has a strong fracture plugging ability, and the purpose of temporarily plugging fractures can be achieved by preventing other liquids from entering the formation through fractures; when the oil production work is completed , The gel breaks under certain controllable conditions, removes plugging, and restores the original production conditions ...

AI Technical Summary

Problems solved by technology

[0004] (1) The scope of application is narrow, and the success rate of temporary blocking is low

Generally speaking, the success rate of oil-soluble temporary plugging agents is lower than 70%, mainly because oil-soluble temporary plugging materials require resin particles to be small enough (above 80 mesh), and the oil-soluble resins used are slow to remove plugging and have low temporary plugging efficiency;

[0005] (2) The production cost is relatively high;

[0006] (3) Easy to jam the pump to block the oil layer;

[0007] (4) The water content of oil wells increases year by year with vigorous exploitation, and the ability of crude oil in oil wells to dissolve oil-soluble temporary plugging materials decreases seriously, making it difficult to remove plugging, and is no longer suitable for low-permeability oil wells.

At present, there is no relevant record of the above temporary plugging materials in the industry

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