Water retaining agent for liquid well cementing cement

Abstract

The invention discloses a water retaining agent for liquid well cementing cement. The preparation method comprises the following steps: (1) putting 75.43 parts of distilled water in a reaction kettle, stirring and successively adding 17.5 parts of 2-methacrylamide-2-methyl propane sulfonic acid, 0.53 part of acrylamide and 0.7 part of maleic anhydride for abundant dissolution; (2) adding 3.8 parts of sodium hydroxide in the solution so that the pH value is regulated to 6-7, then adding 0.01 part of isopropanol, evenly stirring, and adding 0.175 part of ammonium persulfate in the kettle to stir for 5 minutes when heating to 48-50 DEG C; and (3) stopping stirring, then stirring and cooling when the temperature of the material liquid is raised to 80-90 DEG C, so as to react for 4 hours at the temperature of 80-85 DEG C, and inspecting by sampling so as to discharge the material. Because quadripolymer is added, the water retaining agent has the advantages of high temperature resistance and salt resisting property, thereby meeting the requirements of deep well and ultra-deep well cementing.

Description

Technical field: [0001] The invention relates to a composition for consolidating wellbore walls, in particular to a liquid cementing cement fluid loss reducer suitable for meeting the performance requirements of oilfield cementing slurry under high temperature, high pressure and high salt conditions. Background technique: [0002] Current oil well cement fluid loss additives, such as polyethanol, cellulose and acrylamide copolymers, have poor shear resistance in practical applications, severe degradation during pumping, poor salt resistance, and resistance to high-valent metal ions. Sensitive, poor thermal stability, easy to decompose at high temperature, and cannot meet the needs of cement slurry performance under high temperature, high pressure and high salt conditions. Summary of the invention: [0003] The purpose of the present invention is to provide a fluid cementing cement fluid loss reducer that can meet the performance requirements of cementing slurry under high temperat...

AI Technical Summary

Problems solved by technology

[0002] Current oil well cement fluid loss reducers, such as polyethanol, cellulose, and acrylamide copolymers, have poor shear resistance in practical applications, severe degradation during pumping, poor salt resistance, and high-valent metal ions. Sensitive, poor thermal stability, easy to decompose at high temperature, cannot meet the performance needs of cementing slurry under high temperature, high pressure and high salt conditions