High-temperature high-pressure well cementation additive
A high-temperature, high-pressure, additive technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of fast thickening of cement slurry and affect the normal construction of cementing operations, etc., to reduce the density difference between the upper and lower and prolong the thickening Time, the effect of improving dispersion
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[0025] High temperature and high pressure cementing additives, including component A and component B, component A includes the following raw materials in parts by weight: 20 parts of water reducer, 5 parts of hydroxyethylidene diphosphonic acid, 1 part of zeolite powder, and 30 parts of water ;Component B includes the following raw materials in parts by weight: 5 parts of coconut shell powder, 0.5 part of sugarcane powder, 3 parts of sodium carboxymethylcellulose, 2 parts of zinc acrylate, 5 parts of polyvinylpyrrolidone, and 200 parts of water;
[0026] Wherein, the preparation method of coconut shell powder is: pulverize coconut shell, sieve, obtain pulverized material, add the 4M sulfuric acid aqueous solution of its total mass 10 times amount to pulverized material, soak 2h, filter to obtain coconut shell slag, coconut shell slag is obtained. The shell slag is dried in a vacuum drying oven at 120°C to obtain pretreated coconut shell slag, and 10 times the total mass of etha...
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