High-strength temporary plugging agent capable of realizing well zone seepage and preparation method thereof

Abstract

The invention provides a high-strength temporary plugging agent capable of realizing well zone seepage and a preparation method thereof. The high-strength temporary plugging agent is prepared by the following steps: uniformly dispersing a hydrophilic nano-material in a solvent, then adding a glyceryl allyl ether monomer, stirring or performing ultrasonic treatment for 0.5-3 hours, then adding an acrylamide monomer, stirring to dissolve the acrylamide monomer, adding N,N-methylene acrylamide, an acrylate compound and an initiator under the conditions of stirring and continuously introducing nitrogen, continuously reacting for 5-12 hours, and drying after the reaction is finished, so as to obtain the temporary plugging agent. According to the high-strength temporary plugging agent capable of realizing well zone seepage, the plugging rate is high and can reach 96% or above; and the temporary plugging agent is high in plugging removal rate, the plugging removal rate reaches 81% or above, residual gel obtained after final plugging removal is less, the influence on the stratum is small, meanwhile, the plugging agent is high in plugging strength and wider in application range, 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 high-strength temporary plugging agent capable of realizing seepage in well zones and a method for preparing the high-strength temporary plugging agent capable of realizing seepage in well zones. Background technique [0002] With the development of old oil wells in major oilfields across the country, the production of oil wells has gradually decreased. The use of fracturing methods to increase oil and gas production and extend the life of oil wells is currently a common method. 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 ...

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

At the same time, with the gradual development of ultra-deep wells and ultra-high temperature wells, the current temporary plugging agents on the market degrade quickly under high temperature conditions, which cannot meet the requirements of ultra-deep wells for temporary plugging agents. Temporary plugging agent with controllability, long plugging time, high plugging strength and temperature resistance