High-efficiency foaming agent for acidic CO2 foam fracturing system

Abstract

The invention discloses a high-efficiency foaming agent for an acidic CO2 foam fracturing system, which is applicable to a CO2 foam fracturing system of an Ordos Basin gas well. The high-efficiency foaming agent for the acidic CO2 foam fracturing system is characterized by being prepared from the following raw materials in percentage by mass: 38 to 42 percent of a zwitterionic surfactant A, 40 to 45 percent of a zwitterionic surfactant B, 5 to 8 percent of an amphoteric Gemini surfactant, 0.3 to 0.5 percent of a macromolecular polymer and the balance of a solvent. The high-efficiency foaming agent for the acidic CO2 foam fracturing system has excellent foaming performance, a good foam stabilizing effect, strong salt resistance, oil resistance, temperature resistance and acid resistance, and can meet the requirement of gas well CO2 foams on fracturing and foaming.

Description

technical field [0001] The invention relates to a gas well acidic CO 2 Formulation of blowing agents for foam fracturing, especially an acidic CO 2 High-efficiency foaming agent for foam fracturing systems. Background technique [0002] CO 2 Foam fracturing fluid is a high-quality and low-damage fracturing fluid system with high viscosity, strong ability to carry sand and suspend sand, low filtration loss, low friction, clean fracturing fractures, less damage to reservoirs, easy flowback, and fracturing It has the characteristics of high fracturing fluid efficiency, and is especially suitable for fracturing stimulation of low pressure, low permeability and water sensitive reservoirs. Foam quality is the effect of CO 2 One of the main factors of foam fracturing fluid performance, the effect of foam quality on CO 2 The viscosity of the foam system has a great influence, and the viscosity increases rapidly with the increase of the foam quality, and the quality of the foam ...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent 89108127.5 discloses a foaming agent for preparing foam fracturing fluid. The foaming agent mainly uses anionic surfactant as the main raw material and is incompatible with acidic fracturing fluid and formation water. The viscosity is greatly reduced, which affects the cross-linking effect and sand-carrying performance of acidic fracturing fluid

[0006] Chinese patent 03104739.4 discloses a novel foaming agent for fracturing, which is composed of zwitterionic surfactants, anionic surfactants and low-molecular alcohols. The incompatibility of the acidic fracturing fluid system greatly reduces the viscosity of the acidic fracturing fluid, which affects the crosslinking effect and sand-carrying performance of the acidic fracturing fluid