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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

Active Publication Date: 2022-06-28
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the development of unconventional oilfields focuses on high-temperature and high-salinity reservoirs. Therefore, the existing clean fracturing fluid system cannot meet the viscosity requirements at low surfactant dosage. Although the concentration of the thickener used in the fracturing fluid is relatively low, the relatively complex synthesis process also results in a high cost of using this type of clean fracturing fluid, which restricts its large-scale production and application

Method used

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  • A pH-responsive ternary composite supramolecular cleaning fracturing fluid
  • A pH-responsive ternary composite supramolecular cleaning fracturing fluid
  • A pH-responsive ternary composite supramolecular cleaning fracturing fluid

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preparation example Construction

[0026] The invention provides a preparation method of a ternary composite supramolecular clean fracturing fluid system, comprising the following steps:

[0027] Weigh the corresponding mass of surfactant according to a certain molar ratio, add it into distilled water, and stir at a speed of 100r / min, until there are no visible particles in the solution, and obtain the ternary composite supramolecular cleaning fracturing fluid.

[0028] In some embodiments, the ternary composite supramolecular cleaning fracturing fluid system is also added with an inorganic base or an inorganic acid for pH adjustment.

[0029] In some embodiments, the inorganic base is sodium hydroxide or potassium hydroxide.

[0030] In some embodiments, the inorganic acid is hydrochloric acid, sulfuric acid, or phosphoric acid.

[0031] In some embodiments, 4-carboxybenzaldehyde, aniline forms a supramolecular dynamic covalent bond under basic conditions.

[0032] The invention provides the application of t...

Embodiment 1

[0035] The continuous fluid state transition behavior of the ternary composite supramolecular system at pH is achieved by the formation and cleavage of supramolecular dynamic covalent bonds (imine bonds) by 4-carboxybenzaldehyde and aniline under alkaline conditions. By adjusting the pH value, the ternary compound supramolecular clean fracturing fluid system can obtain more than 3 cycles of morphological changes from spherical micelles to worm-like micelles, and the appearance is from transparent gel-like fluid to low-viscosity fluid change between. This pH-responsive ternary composite supramolecular system can meet the viscosity requirements of fracturing fluids, and can also reduce the adsorption loss in the formation, and has more research value in the field of enhanced oil recovery.

[0036]

[0037] This embodiment provides a pH-responsive ternary composite supramolecular cleaning fracturing fluid. The surfactant in the cleaning fracturing fluid is composed of A: hexad...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/86E21B43/26
CPCC09K8/68C09K8/86E21B43/26C09K2208/30
Inventor 李哲康万利李梦栏杨红斌康鑫朱彤宇周博博张德文张苇琪赵晗何瑛琦贾茹雪王佳琦王康辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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