Fracturing technology of foam fracturing fluid capable of independently generating heat and gas

Abstract

The invention discloses a fracturing technology of foam fracturing fluid capable of independently generating heat and gas. The fracturing technology comprises the following steps that S1, the fracturing fluid and a propping agent are selected, and the foam half-life period of the fracturing fluid is measured, wherein the fracturing fluid is prepared from a thickening agent, a cross-linking agent,heat generating agents, a heat generating catalyst, a breaking aid and a gel breaker, the heat generating agents comprise the heat generating agent A and the heat generating agent B, and the heat generating agent A and the heat generating agent B can be subjected to a heat and gas generating reaction under the action of the heat generating catalyst; S2, a fracturing fluid system is prepared; S3, sand fracturing construction is conducted; and S4, well shut-in is conducted according to the foam half-life period, and flowback is conducted after well shut-in is completed. According to the fracturing technology, the permeability of an oil-gas layer is increased through the fracturing fluid capable of independently generating heat and gas the temperature of a reservoir is increased, pressurization and drainage assistance are achieved, the problem of cold damage to the reservoir is effectively solved, viscosity reduction of thickened oil is promoted, and the oil-gas yield is increased.

Description

technical field [0001] The invention relates to the technical field of oil reservoir stimulation and transformation, in particular to a fracturing process for self-generating heat and gas foam fracturing fluid. Background technique [0002] High pouring oil has the characteristics of high freezing point (the freezing point is generally 40°C-67°C, up to 69°C), high wax content (wax content is generally 30%-35%, up to 45%), etc. During conventional hydraulic fracturing operations, the cold fluid injected into the formation will cool the crude oil around the bottom of the well, causing the viscosity of the crude oil to increase, and the crude oil to precipitate wax or solidify, thereby blocking part of the flow channel. The paraffin, colloid, and When the ambient temperature drops, asphalt will precipitate and lead to organic plugging, which will cause "cold damage" to the reservoir, thus reducing the conductivity of the fracturing fracture. Therefore, how to solve the problem...

AI Technical Summary

Problems solved by technology

[0002] High pouring oil has the characteristics of high freezing point (the freezing point is generally 40°C-67°C, up to 69°C), high wax content (wax content is generally 30%-35%, up to 45%), etc. During conventional hydraulic fracturing operations, the cold fluid injected into the formation will cool the crude oil around the bottom of the well, causing the viscosity of the crude oil to increase, and the crude oil to precipitate wax or solidify, thereby blocking part of the flow channel. The paraffin, colloid, and When the ambient temperature drops, asphalt will precipitate and lead to organic matter plugging, which will cause "cold damage" to the reservoir, thus reducing the conductivity of the fracturing fractures

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