Self-heating gas generation foam fracturing fluid and preparation method thereof

Abstract

The invention discloses a self-heating gas generation foam fracturing fluid and a preparation method thereof. The fracturing fluid is prepared from the following raw materials in percentage by mass: 0.2%-0.5% of a thickening agent, 0.2%-0.5% of a cross-linking agent, 6%-8% of sodium nitrite, 6%-8% of ammonium chloride, 0.7%-1% of a heating catalyst, 0.1%-0.3% of a breaking aid, 0.1%-0.3% of a gelbreaker, and the balance of water. The thickening agent is acid-resistant modified guanidine gum. The fracturing fluid has good gel breaking performance, can automatically generate heat, generate gasand increase pressure, is foamed on site, greatly reduces requirements for ground equipment, has plugging and profile control effects higher than those of conventional foam, has low filtration loss and good sand carrying performance, achieves gel breaking through the low-temperature gel breaker, can promote flowback of the gel breaking fluid, and has good application prospects. The fracturing fluid is suitable for fracturing transformation of middle-shallow-layer high-condensation-point oil, thick crude oil and low-temperature low-pressure low-permeability oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil reservoir stimulation and transformation, in particular to a self-generating heat and gas foam fracturing fluid and a preparation method thereof. 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 t...

AI Technical Summary

Problems solved by technology

The existing hydrophobic polymer self-generating heat-generating fracturing fluid carries sand through high viscosity, which has the disadvantages of difficult gel breaking, incomplete gel breaking, and high cost.

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