Hydrocarbon reservoir protection material and preparation method and application thereof
A technology for protecting materials and oil and gas layers, which is applied in chemical instruments and methods, drilling compositions, etc. to achieve the effects of stable structure, good dispersibility, and good temperature and salt resistance.
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Embodiment 1
[0039] Preparation of amphoteric ion monomer water-soluble modified starch, the specific preparation process is: Weigh 100g of cornstarch, add deionized water, gelatinize at 60°C for 30min, add 5g of potassium persulfate after nitrogen gas for 30min, weigh 100g of acrylamide ( AM), 170g zwitterionic monomer (DMAPS) was dissolved in deionized water and then transferred to the gelatinized starch reactor. The total mass concentration of the monomer was 25%. After reacting at 60°C for 5h, a colloidal solid was obtained, which was washed with acetone A white precipitate was obtained. The white precipitate was dried at 70°C for 20 h and crushed to obtain the final product.
Embodiment 2
[0041] Preparation of anionic monomer water-soluble modified starch, the specific preparation process is: Weigh 100g mung bean starch, add deionized water, gelatinize at 65°C for 40min, add 2.5g sodium persulfate after 15min of nitrogen gas, and weigh 50g acrylamide ( AM), 100g of anionic monomer (AA) was dissolved in deionized water and then transferred to the gelatinized starch reactor, the total mass concentration of the monomer was 20%, after reacting at 70°C for 6h, a colloidal solid was obtained, which was washed with acetone to obtain white precipitate. The white precipitate was dried at 80° C. for 16 hours and then pulverized to obtain an anionic monomer water-soluble modified starch.
Embodiment 3
[0043] Prepare cationic monomer water-soluble modified starch. The specific preparation process is as follows: Weigh 100g of wheat starch and add deionized water to gelatinize at 70°C for 50min. (AM), 40g of cationic monomer (DMC) was dissolved in deionized water and then transferred to the gelatinized starch reactor. Washing yielded a white precipitate. The white precipitate was dried at 75° C. for 24 hours and then pulverized to obtain a cationic monomer water-soluble modified starch.
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