Process for synthesizing specific carboxylic styrene butadiene latex for well cementation of oil-gas field

Abstract

The invention relates to a process for synthesizing single-purpose carboxylic styrene butadiene latex for well cementing in oil and gas field by using butadiene and phenylethene as main monomer, using carboxylates or / and sulfonic acid, sulfonate containing unsaturated bond as functional monomer, and using composite emulsifying agent system. The invention realizes a C8-C20 alkyl sodium sulfate, C8-C20 sodium alkyl benzene sulphonate- non-ionic emulsifier, wherein the polymerization temperature is preferably between 50-90 deg. C.

Description

technical field [0001] The invention relates to a method for synthesizing carboxylated styrene-butadiene latex used as fluid loss reducing agent in well cementing operations in oil and gas fields. Background technique [0002] A large number of external cement additives are used in the cementing construction process of the oil exploration industry. Among these external additives, cement slurry fluid loss reducer has great application space in reducing flow loss, free water, improving flow performance, preventing annular air channeling and increasing compressive strength. [0003] In the process of oil extraction, cementing is an important link. The water loss of cement slurry without fluid loss reducer is as high as 1500-2000ml / 30min. A large amount of water loss will cause damage to the production layer and affect the displacement efficiency of cement slurry. Severe water loss may even cause cementing failure and cause huge economic losses. In order to control fluid loss...

AI Technical Summary

Problems solved by technology

The application of domestic latex cement slurry in well cementing is still in the stage of exploration and use