Semi-interpenetrating network gel plugging material for oil and gas fields and preparation method thereof
A technology of semi-interpenetrating network and leak-stopping material, which is applied in the field of semi-interpenetrating network gel leak-stopping material and preparation field for oil and gas fields, can solve the problem of cracked and karst leakage without breakthrough progress, and the gel strength is difficult to achieve Effective plugging, difficult to control cross-linking time, etc., to achieve the effects of excellent penetration ability, improved jelly strength and shear toughness, improved success rate and pressure bearing capacity
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[0032] According to another aspect of the present application, there is also provided a method for preparing the above-mentioned plugging material, which includes the following steps: S1: dissolving the antioxidant in water to form solution A; S2: dissolving the polyacrylamide polymer , Polyvinylpyrrolidone and the crosslinking agent are dispersed into the solution A according to the ratio and mixed uniformly to obtain a semi-interpenetrating network gel plugging material base liquid; S3: the semi-interpenetrating network gel plugging material base liquid After 8-12 hours of reaction, cross-linking to obtain the semi-interpenetrating network gel plugging material.
[0033] In order to simulate the natural environment and fully dissolve the polyacrylamide polymer, polyvinylpyrrolidone and crosslinking agent, and mix them uniformly with the solution A, preferably, the polyacrylamide polymer, polyvinylpyrrolidone, and the When the vinylpyrrolidone and the crosslinking agent are disp...
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[0038] Example 1
[0039] Dissolve 0.1 wt% of thiourea in clean water. Then, 4wt% of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid copolymer (P(AM-co-AMPS)) with a molecular weight of 250,000 and a degree of hydrolysis of 10wt% and 0.2wt% of K90 polyvinylpyrrolidone, 0.5wt% of water-soluble phenolic resin crosslinking agent, and 0.1% chromium acetate are thoroughly mixed and dispersed in clean water. Continue stirring for 0.5-1h to fully dissolve it. At a circulating temperature of 20-60℃, 8- After 12 hours, cross-linked to obtain a semi-interpenetrating network gel plugging material.
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[0040] Example 2
[0041] Dissolve 0.2wt% of sodium bisulfite in clean water. Then, 1wt% of acrylamide with a molecular weight of 2 million and a degree of hydrolysis of 5wt% was cross-linked with acrylic acid (P(AM-co-AA)), 5wt% K15 polyvinylpyrrolidone, and 0.3wt% water-soluble phenolic resin Disperse into clean water after mixing with 0.05% aluminum citrate crosslinking agent, continue to stir for 0.5-1h to fully dissolve it, and crosslink at 90-120℃ cycle temperature after 8-12h to obtain a semi-interpenetrating network gel plug Leaking material.
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