Carbon dioxide foam fracturing system foaming agent as well as preparation method and application thereof

Abstract

The invention discloses a carbon dioxide foam fracturing system foaming agent which is prepared from the following raw materials in percentage by weight: 38-42% of zwitterionic surfactant, 5-8% of C12-18 nonionic surfactant, 0.05-0.2% of high-molecular compound, 5-10% of solvent and the balance of water. Wherein the zwitterionic surfactant is any one of didodecyl methyl carboxyl glycine betaine, adamantyl glycine betaine, dicarboxyl glycine betaine and polyoxyethylene carboxyl glycine betaine. Meanwhile, the invention further discloses a preparation method and application of the foaming agent.The foaming agent has good temperature resistance, acid resistance and salt resistance, and is suitable for being used in a carbon dioxide foam fracturing system.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field exploitation, and in particular relates to a carbon dioxide foam fracturing system foaming agent and its preparation method and application. Background technique [0002] Foam fracturing fluid is a gas-in-liquid emulsion, which is a uniform dispersion of a large amount of gas in a small amount of liquid. The development of foam fracturing fluid at home and abroad has gone through the following four stages: the first generation foam fracturing fluid: water + foaming agent, easy to flow back after fracturing, and can be used for low-pressure gas well fracturing; the second generation foam fracturing fluid: water + foaming agent + polymer, the fracturing fluid has high viscosity and high stability, and is suitable for high-pressure oil and gas reservoir fracturing; the third generation foam fracturing fluid: water + foaming agent + polymer + fracturing fluid, viscosity And the stability is...

AI Technical Summary

Problems solved by technology

The foaming agents used in conventional fracturing are mostly anionic surfactant system or cationic surfactant system, the foaming agent of anionic surfactant system is incompatible with high salinity fracturing fluid and formation water, while The foam stabilizer of the cationic surfactant system is seriously absorbed by the sandstone formation rock, which affects the foam stabilization effect of the foam fracturing fluid

Moreover, the foaming agent used in conventional fracturing has poor acid resistance and temperature resistance, and is not biodegradable, so it is not suitable for acidic CO 2 foam fracturing

Images