Preparation process of clean fracturing fluid with remarkably increased viscosity number of system

Abstract

The invention discloses a preparation process of a clean fracturing fluid with remarkably increased viscosity number of a system. The preparation process comprises the following steps of: (a) firstly, adding a 1.8%-2.2% surfactant in a 3.0%-5.0% saline solution, and stirring for a period of time; (b) secondly, adding 0.4-0.6% sodium salicylate under the stirring condition, and adequately stirring to obtain a solution; and (c) finally, preserving the solution in a constant-temperature water bath for a period of time to adequately defoam, then obtaining the clean fracturing fluid. According to the invention, via control of the dosages of saline, surfactant and sodium salicylate, the viscosity number of the whole system can be greatly increased, and then the product quality of the prepared clean fracturing fluid can be improved.

Description

technical field [0001] The invention relates to a preparation process of clean fracturing fluid, in particular to a preparation process of clean fracturing fluid which significantly increases the viscosity of the system. Background technique [0002] The hydraulic fracturing stimulation technology of oil and gas wells is an effective method to transform oil and gas layers, and an effective measure for increasing production and injection of oil and gas wells and water wells. This technology has accumulated more than 50 years of experience and is widely used in oil and gas field exploration and development. At the same time, 6×10 4 tons of chemicals. [0003] The so-called hydraulic fracturing of the oil layer is to use hydraulic force to form cracks in the oil layer buried hundreds to thousands of meters. The process of hydraulic fracturing of oil layers generally refers to the use of high-pressure and large-displacement pumps on the ground to inject a liquid (fracturing f...

AI Technical Summary

Problems solved by technology

[0006] Domestic research on clean fracturing fluids is relatively late. At present, CTAB and Schlumberger’s J508 surfactant are the main VESs used. The problem is that the viscoelastic effect of CTAB is relatively weak, especially when the temperature is higher than 60 °C, the viscous It will be greatly reduced and lose the effective suspension effect on proppant

It has the characteristics of low cost, safety, strong operability, good comprehensive performance, and wide application range, but the potential problem is damage to water-sensitive reservoirs, as well as flow conductivity caused by residues, unbroken thickened gels, and filter cakes damage

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