A kind of preparation method of ternary polymer fluid loss reducing agent for oil well cement

Abstract

The invention discloses a preparation method of a ternary polymer filtrate loss reduction additive for oil well cement. The preparation method comprises the following steps: firstly preparing 8.4 parts of deionized water and 1 part of ammonium persulfate into an initiating agent solution for later use; then adding 639.6 parts of the deionized water to a reaction kettle, sequentially adding 139 parts of 2-acrylamido-2-methyl propanesulfonic acid, 20.7-27.5 parts of acryloyl morpholine, 9 parts of acrylic acid, 4.4 parts of isopropanol and 0.1 part of light calcium carbonate during stirring for uniform dissolution and mixing; regulating a PH value to 4-5 by using 79 parts of 40% caustic soda solutions, and controlling temperature below 40 DEG C at the same time; increasing the temperature of a material inside the reaction kettle to 58-60 DEG C, then slowly adding a spare initiating agent solution, and fixing reaction temperature at 79-83 DEG C for continuous reaction, wherein the reaction is lasted for 240 minutes by counting time from adding the initiating agent solution; and reducing to room temperature, and stopping stirring. The preparation method disclosed by the invention can be used for preventing the phenomenon of reversion of cement thickening time and has no toxic effect on contacted people.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly oil well cement ternary polymer fluid loss reducer made of non-toxic raw materials. Background technique [0002] The current oil well cement slurry polymer fluid loss reducer is made of acrylamide as the main raw material. Although the fluid loss reducer made of this raw material has better performance of fluid loss due to the presence of amide groups, However, it is easy to decompose at high temperature, resulting in long thickening time of cement slurry at high temperature, short thickening time at low temperature, and inverted thickening time, which affects the quality of cementing construction. At the same time, this substance in the raw material has a neurotoxic effect on the exposed population, and even causes genetic mutation in severe cases. Contents of the invention [0003] The purpose of the present invention is to provide an oil well cement ternary polymer that not...

AI Technical Summary

Problems solved by technology

[0002] The current oil well cement slurry polymer fluid loss reducer is made of acrylamide as the main raw material. Although the fluid loss reducer made of this raw material has better performance of fluid loss due to the presence of amide groups, However, it is easy to decompose at high temperature, resulting in long thickening time of cement slurry at high temperature and short thickening time at low temperature, and the thickening time is inverted, which affects the quality of cementing construction

At the same time, this substance in the raw material has neurotoxic effects on the exposed population, and even causes genetic mutations in serious cases.