Graft type fracturing fluid and preparation process thereof
A fracturing fluid, branch type technology, applied in the direction of chemical instruments and methods, drilling compositions, etc.
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Embodiment 1
[0017] In the reaction vessel, the carboxymethyl cellulose and acrylamide monomers are made into an aqueous solution according to carboxymethyl cellulose: acrylamide: water (mass ratio) = 100: 10-50: 750, and filled with N 2 Remove the oxygen in the system, add 0.5wt% (relative to the monomer mass) initiator (1wt% ammonium persulfate solution), react at 50°C for 5h; the reaction product is diluted into an aqueous solution with a mass concentration of 0.4-1.0wt%, A graft type fracturing fluid base fluid can be obtained; the apparent viscosity of the base fluid is measured by RV-20 rotary viscometer, 170S at 45℃ -1 Finished at shear rate. The results are listed in Table 1:
[0018] Table 1
[0019] Carboxymethyl cellulose: acrylamide (mass ratio)
Embodiment 2
[0021] In the reaction vessel, the carboxymethyl starch and acrylamide monomers are made into an aqueous solution according to carboxymethyl starch: acrylamide: water (mass ratio) = 100: 30-60: 200; filling with N 2 Remove the oxygen in the system, add 1.0wt% (relative to the monomer mass) initiator (1wt% ammonium persulfate solution), react at 40°C for 6h; the reaction product is diluted into an aqueous solution with a mass concentration of 0.4-1.0wt%, A graft type fracturing fluid base fluid can be obtained; the apparent viscosity of the base fluid is measured by RV-20 rotary viscometer, 170S at 45℃ -1 Finished at shear rate. The results are listed in Table 2:
[0022] Table 2
[0023] Carboxymethyl starch: acrylamide (mass ratio)
Embodiment 3
[0025] In the reaction vessel, the carboxymethyl cellulose and acrylamide monomers are made into an aqueous solution according to carboxymethyl cellulose: acrylamide: water (mass ratio) = 100: 30: 1000, and filled with N 2 Remove oxygen in the system, add 0.02wt% (relative to monomer mass) initiator (1wt% ammonium persulfate solution), react at 60℃ for 2h; the resulting product is diluted with water to a mass concentration of 0.4-1.0wt% Aqueous solution, which is the base fluid of a graft type fracturing fluid;
[0026] The base fluid of the graft type fracturing fluid is kept at 30°C for 4 hours. After adjusting the pH of the system to 6.5, add potassium aluminum sulfate and ammonium persulfate aqueous solutions under stirring. The usage amounts of potassium aluminum sulfate and ammonium persulfate are respectively 0.5wt% and 0.05wt% of the mass of the fracturing fluid, a graft type fracturing fluid can be obtained.
[0027] Fixed 170S -1 Shear rate, measure the apparent viscosit...
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