Inorganic-organic salt-resisting and high temperature-resisting polymer fluid loss additive for drilling fluid

Abstract

The invention discloses an inorganic-organic salt-resisting and high temperature-resisting polymer fluid loss additive for drilling fluid, which is characterized in that: 2-acrylamide group-2-methyl sodium propanesulfonic acid, dimethyl diene propyl group ammonium chloride, acrylamide and sodium acrylate are used as main polymers, and inorganic salt is used as transformation temperature stabilizing agent. Aqueous solution is prepared according to a certain mass ratio, initiators are added for polymerization at certain temperature, so as to generate macromolecule polymer of elastic colloid, and after drying and grinding are carried out, a target compound is obtained. The additive is easy to dissolve in water, has good capacity of filtration loss reduction, temperature resistance, salt resistance, calcium resistance and magnesium pollution resistance, has good tackifying effect, can effectively control mud making of the stratum and inhibit the dispersion of clay and drilling cuttings, and has good compatibility with the common treating agents.

Description

Technical field [0001] The invention relates to a preparation method of an inorganic-organic salt-resistant and high-temperature resistant polymer fluid loss agent for drilling fluids, belonging to the technical field of synthetic preparation of water-soluble polymer materials for drilling fluid chemicals. Low dosage, salt resistance, calcium resistance, and good temperature resistance. technical background [0002] In recent years, with the increase in the number of drilling special wells, ultra-deep wells and complex wells, higher requirements have been put forward on drilling fluid technology. Drilling fluid treatment agents can no longer fully meet the needs of drilling fluid technology development. Through research and analysis, Pure anion and cation copolymerization was used to synthesize a sulfonic acid group temperature-resistance and salt-resistance copolymer fluid loss control agent for drilling fluids. However, in practical applications, the polymerization of four mono...

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Problems solved by technology

[0002] In recent years, with the increase in the number of drilling special wells, ultra-deep wells and complex wells, higher requirements have been put forward for drilling fluid technology. Drilling fluid treatment agents can no longer fully meet the needs of drilling fluid technology development. Through research and analysis, Using pure anion and cation copolymerization, a copolymer drilling fluid fluid loss reducer containing sulfonic acid groups that is resistant to heat and salt was synthesized. However, in practical applications, the polymerization of the four monomers alone has polymer stability and high temperature aging for 16 hours. After (after 16h aging, the temperature at which the viscosity and fluid loss control ability of the polymer decreases by 50%, is defined as the 16h stable temperature) hydrolysis and oxidative degradation

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