Temporary plugging agent capable of realizing well zone seepage and preparation method thereof

Abstract

The invention provides a temporary plugging agent capable of realizing well zone seepage and a preparation method thereof. The temporary plugging agent is prepared by the following steps: dissolving an acrylamide monomer and a glyceryl allyl ether monomer in a solvent, adding N,N-methylene acrylamide, an acrylate compound, and an initiator, continuously reacting for 5-12 hours, and after reaction, drying to obtain thetemporary plugging agent, wherein the acrylate compound is one of butanediol diacrylate, dipropylene glycol acrylate and neopentyl glycol diacrylate, the mass ratio of N,N-methylene acrylamide to the acrylate compound is 1: (5-12), and the mass of N,N-methylene acrylamide accounts for 0.08%-0.15% of the total mass of the monomer. According to the temporary plugging agent, the plugging rate is high and can reach 95% or above, the plug removal rate is high and can reach 82% or above, residual gel obtained after plug removal is conducted finally is little, the influence on the stratum is small, and the temporary plugging agent can be used for well zone seepage volume fracturing.

Description

technical field [0001] The invention belongs to the technical field of oil recovery additives, and in particular relates to a temporary plugging agent capable of realizing seepage in well zones and a method for preparing the temporary plugging agent. Background technique [0002] With the development of old oil wells in major oilfields across the country, the production of oil wells has gradually decreased. Practical fracturing means to increase oil and gas production and prolong the life of oil wells is a common method at present. Before the fracturing operation, it is first necessary to use a temporary plugging agent to seal the original fractures. After the fracturing operation is completed, the temporary plugging agent will gradually remove the plugging, which can avoid the damage of the plugging agent to the formation. [0003] Well zone seepage volume fracturing is a relatively new fracturing idea proposed at present, which specifically refers to the fracturing mode th...

AI Technical Summary

Problems solved by technology

[0005] At present, under the pressure of environmental protection, some fracturing processes consider directly retaining the fracturing fluid in the reservoir to achieve the effect of reducing flowback or zero flowback. , the braising time usually ranges from a few days to tens of days, therefore, the conventional temporary plugging agent cannot meet these requirements, and there is an urgent need for a temporary plugging agent with a controllable plugging removal time and a long plugging removal time