High-strength temporary plugging agent capable of realizing well zone seepage and preparation method thereof
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A high-strength, temporary plugging agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effect of firm plugging and less residual gel
Active Publication Date: 2022-02-15
西安维克特睿油气技术有限公司
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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
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Embodiment 1
[0028] Take 600g of water and 400g of acetone to make a solvent, take 1g of hydrophilic nano silicon dioxide and evenly disperse in 1000g of solvent, then add 40g of glycerol allyl ether, after ultrasonication for 40min, add 80g of acrylamide, stir to dissolve, Under the condition of stirring and continuous nitrogen flow, add 0.16g N,N-methylene acrylamide, 1.6g butanediol diacrylate and 0.84g potassium persulfate, and continue to react at 65°C for 8h, the reaction is over Finally, the product was rotary evaporated to dryness at 60°C, and then crushed, sieved, and then dried to obtain the high-strength temporary plugging agent G1 that can realize seepage in the well zone.
Embodiment 2
[0030] Take 600g of water and 400g of acetone to make a solvent, take 1g of hydrophilic nano-calcium carbonate and disperse evenly in 1000g of solvent, then add 45g of glycerin allyl ether, after ultrasonication for 40min, add 50g of acrylamide and 40g of acrylic acid, stir to dissolve , under the condition of stirring and continuous nitrogen flow, add 0.16g N,N-methylene acrylamide, 1.6g butanediol diacrylate and 0.84g potassium persulfate, and continue to react at 65°C for 8h, After the reaction, the product was rotary evaporated to dryness at 60°C, and then crushed, sieved, and then dried to obtain the high-strength temporary plugging agent G2 that can realize seepage in the well zone.
Embodiment 3
[0032] Take 550g of water and 450g of acetone to make a solvent, take 1.5g of hydrophilic nano-silica and disperse evenly in 1000g of solvent, then add 35g of glycerin allyl ether, after ultrasonication for 40min, add 50g of acrylamide and 40g of methacrylamide , stirred to dissolve, and under the condition of stirring and continuing to blow nitrogen, 0.16g of N,N-methylene acrylamide, 1.6g of dipropylene glycol diacrylate and 0.84g of azobisisobutylamidine hydrochloride were added, And continue to react at a temperature of 53°C for 8 hours. After the reaction is completed, the product is evaporated to dryness at 60°C, and then crushed, sieved, and dried again to obtain a high-strength temporary plugging agent that can realize seepage in the well zone G3.
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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 ...
Claims
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