A kind of acid pressure temporary plugging agent and preparation method thereof
A temporary plugging agent and acid fracturing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low temporary plugging strength, complicated preparation technology, and the temporary plugging agent is not easy to self-degrade, and is widely applicable. Sexual, easy-to-flow effect
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preparation example 1
[0027] Preparation Example 1: Preparation of Polyester Copolymer Reinforcing Agent
[0028] Accurately weigh and dry 20g of β-cyclodextrin into the reaction kettle, add 100g of dimethyl sulfoxide, stir to dissolve completely, then add 5g of lactide, after it dissolves, add 0.1g of catalyst triethylamine, nitrogen protection Heat up to 85°C and react for 8 hours to obtain a light yellow liquid, which is cooled and poured into ice water to obtain a precipitate, filtered, washed with ethyl acetate, filtered and dried to obtain a white polyester copolymer, and the reaction process is as follows:
[0029]
[0030] Wherein m is 80%, n is 20%; the molecular weight of the polymer is 4-6 million.
preparation example 2
[0031] Preparation Example 2: Preparation of Modified Starch Copolymer
[0032] Mix 20g of starch with water evenly, stir and gelatinize at 70°C for 1 hour, cool to room temperature, add the gelatinized starch into the reaction kettle, add 50g of acrylamide and 30g of methyl acrylate in sequence, stir until completely dissolved, and then dissolve it with sodium hydroxide Solution Adjust the pH value of the reaction solution to 11, pass nitrogen into the reaction kettle for 30 minutes until the oxygen is completely removed, add 0.2 g of initiator azobisisobutylimidazoline hydrochloride, continue stirring for 10 minutes, heat up to 60 ° C, seal Reaction 2h obtains the modified starch copolymer copolymer of white viscous gel, and its reaction process is:
[0033]
[0034] Wherein, m is 50%, x is 20%, y is 30%; the molecular weight of the polymer is 3 to 5 million.
Embodiment 1
[0035] Embodiment 1: the preparation of temporary plugging agent
[0036] Based on the total weight of the mixture, physically mix 35g of polyester copolymer reinforcing agent, 40g of modified starch copolymer, and 25g of cross-linked copolymer in a reactor to obtain acid fracturing temporary plugging agent, acid fracturing temporary plugging agent Containing the polyester copolymer reinforcing agent shown in general structural formula (1), the modified starch copolymer shown in general structural formula (2), the cross-linked copolymer shown in general structural formula (3):
[0037]
[0038] Wherein x=y=z, the molecular weight of the polyester copolymer reinforcing agent is 4 to 6 million;
[0039]
[0040] Among them, the molecular weight of the modified starch copolymer is 3 million to 5 million;
[0041]
[0042] The molecular weight of the cross-linked copolymer is 1.3 to 1.7 million.
[0043] The preparation method of embodiment 2-7 is identical with embodim...
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