Encapsulated solid acid, preparation and applications thereof
A solid acid, encapsulation technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of short action time, inability to ensure acid-liquid binding, poor construction effect, etc. The release rate and the effect of easy on-site construction
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[0058] Example 1: Preparation of encapsulated solid acid by coating dry nitric acid powder with chitosan by solvent evaporation method.
[0059] (1) Disperse nitric acid powder and polymer stabilizer in an organic solvent to obtain solution A;
[0060] (2) Stir and mix the material of the capsule wall and water evenly with a stirrer at a speed of 1000-2000r / min to prepare solution B;
[0061] (3) Mix solutions A and B slowly at a volume ratio of 25:1 to form an emulsion, and at the same time, heat to 30-50°C and stir for 2-5 hours to form a white emulsion;
[0062] (4) Centrifuge the emulsion at a speed of 2000-3000r / min for 30 minutes to obtain a precipitate, and then place the precipitate at minus 70°C and a pressure of 0.01-0.005 Pa for 5-10 hours for freeze drying to obtain Encapsulated solid acid with a particle size of 20-45μm and a mass ratio of the capsule wall to the capsule core of 3:7.
Example Embodiment
[0063] Example 2: Preparation of encapsulated solid acid by coating dry nitric acid powder with chitosan by solvent evaporation method.
[0064] (1) Disperse nitric acid powder and polymer stabilizer in an organic solvent to obtain solution A;
[0065] (2) Stir and mix the material of the capsule wall and water evenly with a stirrer at a speed of 1000-2000r / min to prepare solution B;
[0066] (3) Mix solutions A and B slowly at a volume ratio of 15:1 to form an emulsion, and at the same time, heat to 30-50°C and stir for 2-5 hours to form a white emulsion;
[0067] (4) Centrifuge the emulsion at a speed of 2000-3000r / min for 30 minutes to obtain a precipitate, and then place the precipitate at minus 70°C and a pressure of 0.01-0.005 Pa for 5-10 hours for freeze drying to obtain Encapsulated solid acid with a particle size of 20-45μm and a mass ratio of the capsule wall to the capsule core of 1:2.
Example Embodiment
[0068] Example 3: Preparation of fracturing acidification fluid.
[0069] The encapsulated solid acid prepared in Example 1 was used to prepare the fracturing acidification fluid according to the amount in Table 1.
[0070] Diversion experiment, core dissolution experiment and dynamic fluid loss determination were carried out on the prepared fracturing acidification fluid. The results are shown in Table 10.
[0071] Table 1 Composition of fracturing acidification fluid according to mass
[0072] Corresponding mineral acid hydrochloric acid15% Encapsulated solid acid Dry powder nitric acid particles3% Thickener Xanthan gum0.5% Iron ion stabilizer EDTA1.0% Corrosion inhibitor Pentadecyl imidazoline1.0% water margin
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