High-temperature-resistant clean acidic fracturing fluid and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant clean acidic fracturing fluid and a preparation method thereof. The fracturing fluid comprises the following formula components: a viscoelastic surfactant ves-c, hydrochloric acid, acetic acid, citric acid, oxalic acid, an anti-swelling agent JSH and a corrosion inhibitor. According to the proportioning scheme, the high-temperature-resistant clean acidic fracturing fluid is prepared from the following components in parts by mass: 0.3-0.5 part of a viscoelastic surfactant ves-c; 3-4 parts of hydrochloric acid; 4-5 parts of acetic acid; 0.5-1part of citric acid; 0.5-1 part of oxalic acid; 1-1.5 parts of an anti-swelling agent JSH; and 0.3-0.5 part of a corrosion inhibitor . The fracturing fluid prepared by the preparation method disclosedby the invention is used for delaying the acid rock reaction rate, achieves deep acidification of a stratum without damage, and improves the fracturing effect of the acid fracturing fluid.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing fluid, in particular to a high-temperature-resistant clean acidic fracturing fluid and a preparation method thereof. Background technique [0002] At present, most of the onshore conventional oilfields in my country have entered the middle and late stages of exploitation. The exploitation potential is low and the exploitation is difficult. The proportion of low-permeability oil and gas reserves is increasing year by year, which has become the research focus of oilfield development. [0003] At present, the main technical method for developing low-permeability oil and gas fields is fracturing fluid technology. However, due to the damage of reservoir fillers to the formation, conventional hydraulic fracturing technology cannot effectively stimulate the reservoir, and the efficiency is usually low. The rock minerals of the reservoir usually include illite, chlorite, montmorillonite, kaoli...

AI Technical Summary

Problems solved by technology

Emulsified acid is prepared by mixing acid and oil in proportion. It relies on the encapsulation effect of oil on acid, thereby delaying the migration speed of H+. However, the water-in-oil emulsion is unstable and will break under high temperature, high pressure and high shear. Effect

Foam acid is an aerated acid liquid or gasified acid liquid, which relies on air bubbles to reduce the contact area between acid and rock, and limits the mass transfer of H+ in the acid liquid, delaying the reaction rate of acid rock, but the foam is also unstable

Surfactant acid is the addition of viscoelastic surfactants to the acid solution to make the solution viscous and reduce the mass transfer of H+. Surfactants have attracted much attention because of their relatively small molecular weight and no damage to the reservoir. Most of the surfactants are not resistant to high temperature (not exceeding 90°C), so it is necessary to develop a high temperature resistant acidic fracturing fluid surfactant

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