Self energy generating type clean fracturing fluid and preparation method thereof

Abstract

The invention discloses self energy generating type clean fracturing fluid which is prepared from the following raw materials in weight percentage: 1.5% to 5.5% of C12 to C22 quaternary ammonium saltcationic surface active agent, 0.25% to 0.70% of salicylic acid, 1.0% to 4.0% of chloride, 2.0% to 4.5% of carbon dioxide releasing agent and the balance of water, when the chloride is potassium chloride and / or ammonium chloride, and the carbon dioxide releasing agent is sodium carbonate or sodium bicarbonate. In addition, the invention further discloses a preparation method of the fracturing fluid. Compared with existing clean fracturing fluid, preparation cost of the self energy generating type clean fracturing fluid is remarkably reduced; the raw materials react to generate a micelle accelerant and release a lot of CO2 gas at the same time to form gel foam, and the gel foam has the performance characteristics of the foam fracturing fluid; meanwhile, stratum energy is increased, and flowback of gel breaking fluid is facilitated; the fracturing fluid has no residue and low harm and is especially suitable for fracturing increasing and production increasing of low-pressure, low-permeation and low-temperature oil gas.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry and fracturing stimulation, and in particular relates to a self-generating clean fracturing fluid and a preparation method thereof. Background technique [0002] Fracturing is one of the main measures to increase oil production. In the prior art, cationic clean fracturing fluids are generally composed of quaternary ammonium salt surfactants with different carbon chains, counter ions and inorganic salts. The fracturing fluid has the advantages of simple composition, convenient liquid preparation, no residue, no gel breaker, good salt resistance and low damage, etc. production needs. However, the poor temperature resistance of fracturing fluid and the high cost of preparation have always affected large-scale fracturing operations. [0003] Carbon dioxide foam fracturing is a new fracturing sand-carrying fluid technology formed by mixing liquid carbon dioxide with polymer solution or cr...

AI Technical Summary

Problems solved by technology

In the currently widely used foam fracturing fluid preparation methods, nitrogen and carbon dioxide are generally provided by special high-pressure and low-temperature storage tanks for storing liquid nitrogen and liquid carbon dioxide, which makes the construction equipment complicated and the fracturing fluid preparation process cumbersome. The cost of fracturing fluid preparation High, not conducive to large-scale field application

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