A kind of gel composition and its nitrogen foam gel composite temporary plugging agent
A technology of gel composition and nitrogen foam, which is applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the problems of weak foam profile control, easy to be broken by steam, and large formation damage. Achieve the effects of reducing damage, strong measure selectivity, and small formation damage
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[0032] This embodiment provides a gel composition, which includes: 1.0 wt% partially hydrolyzed polyacrylamide (the degree of hydrolysis is 25%, and the degree of polymerization is 16×10 4 , with a molecular weight of 1200×10 4 ), 1.5wt% formaldehyde, 0.5wt% hydroquinone, and the balance is water. The gel composition is obtained by uniformly mixing the above-mentioned materials in proportion.
[0033] This embodiment also provides a nitrogen foam gel composite temporary plugging agent, which includes: nitrogen and foam gel, the volume ratio of the two is nitrogen:foam gel=50:1 (under standard atmospheric pressure). Wherein, the foam gel is a mixture of the above-mentioned gel composition and a high-temperature-resistant foaming agent, and, based on the volume of the gel composition, the concentration of the high-temperature-resistant foaming agent is 12 g / L. In terms of mass percentage, the high temperature resistant foaming agent includes 99.7% tall oil fatty acid sodium sa...
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