A pH-responsive ternary composite supramolecular cleaning fracturing fluid

A clean fracturing fluid, ternary composite technology, applied in drilling compositions, wellbore/well components, production fluids, etc., can solve problems that restrict large-scale production applications, cannot meet viscosity requirements, and clean fracturing in synthetic processes The problem of high cost of liquid use, to achieve the effect of universality, low cost, and easy large-scale production
CN113249109BActive Publication Date: 2022-06-28CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2022-06-28

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Abstract

The invention belongs to the technical field of oil production chemistry in the development of oil and gas fields, and discloses a pH-value-responsive ternary composite supramolecular cleaning fracturing fluid formula, the components and proportions of which are as follows: surfactant cetyl trimethyl chloride Ammonium, 4-carboxybenzaldehyde, aniline, molar ratio 60:40:40. Preparation method: Weigh the three substances respectively, add them into distilled water, and stir at a stirring speed of 100 r / min until there are no visible particles in the solution, and then obtain the pH-responsive ternary composite supramolecular cleaning fracturing fluid. The clean fracturing fluid of the present invention can not only avoid the complex synthesis process of oligomeric surfactants, but also has pH value response performance. When the pH value decreased from 7.25 to 3.16, the ternary composite solution changed from a transparent gel-like fluid to a low-viscosity fluid, and the viscosity decreased from 4.8×104 to 1 mPa·s, and the viscosity recovered when the pH increased again. The pH value response property enables the fracturing fluid to quickly break the gel without residue. It is an ideal low-cost clean fracturing fluid with broad application prospects.
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Description

technical field

[0001] The invention belongs to the technical field of oil recovery chemistry in the development of oil and gas fields, and in particular relates to a pH value responsive ternary compound supramolecular cleaning fracturing fluid and a preparation method thereof. Background technique

[0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

[0003] Clean fracturing fluid, viscoelastic surfactant fracturing fluid (VES fracturing fluid for short) has broad application prospects in the development of unconventional oil and gas reservoirs, because the thickener used has a simple molecular structure, good solubility, and It has a series of advantages such as small formation damage and good gel breaki...

Claims

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