Energized water-based fracturing fluid as well as preparation method and application thereof

A water-based fracturing and energizing technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of complex operation, shortened construction period, long construction time, etc., to improve strength , The effect of shortening the construction period

Pending Publication Date: 2022-08-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the existing disadvantages of complex fracturing construction operations and long construction time, and at the same time enhance the temperature resistance of fracturing fluid, the purpose of the present invention is to provide an empowered water-based fracturing fluid and its preparation method and application. The fracturing fluid and the viscosity reducer can be injected together at one time, and the crosslinking agent becomes the release source of the viscosity reducer; the fracturing and viscosity reduction operations are carried out at the same time, which greatly shortens the construction period and increases the amount of fracturing fluid. Temperature resistance

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  • Energized water-based fracturing fluid as well as preparation method and application thereof
  • Energized water-based fracturing fluid as well as preparation method and application thereof
  • Energized water-based fracturing fluid as well as preparation method and application thereof

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preparation example Construction

[0045] The specific preparation process of an energized water-based fracturing fluid is realized by the following reactions:

[0046]

[0047] Specifically, a preparation method of an enabling type water-based fracturing fluid of the present invention includes the following steps:

[0048] 1) Add a certain amount of N,N-dimethylformamide as a solvent to the three-necked reaction flask equipped with the condensation reflux device, and then add a certain amount of acrylic acid-2,3-epoxypropyl octadecenoic acid and acetic acid As a solute, the reaction is carried out at a certain temperature for a certain period of time; the reaction is a ring-opening reaction; the mass ratio of acetic acid to 2,3-glycidyl acrylate octadecenoic acid is (1-2): 1; the mass fraction of the solute is 32-34wt%; the reaction temperature is 50-100°C; the reaction time is 0.5-3h.

[0049] 2) The reaction product is treated with distilled water of equal volume with the solution, so that unreacted acetic...

Embodiment 1

[0062] The constant temperature magnetic stirring oil bath was preheated, and 75g of N,N-dimethylformamide was added as a solvent to the three-necked reaction flask equipped with the condensation reflux device, and then 12g of acrylic acid-2,3-epoxypropyl was added. Octadenoic acid and 25g acetic acid were reacted at 100°C for 0.5h; the reaction product was treated with an equal volume of distilled water, so that the unreacted acetic acid and solvent N,N-dimethylformamide entered the water phase, cooled to room temperature, washed with water and suction filtered Twice to obtain solid intermediate monomer I; take 15g of sodium bisulfite mixed with water, add 10g of monomer I, simultaneously add 10g of 30% hydrogen peroxide as a catalyst, add in a three-necked reaction flask equipped with a condensation reflux device, and react at 60°C 1h; after the reaction, it was cooled to below 36°C, washed with water and filtered twice to obtain powdery intermediate monomer II; 1.5 g of zirc...

Embodiment 2

[0064] The constant temperature magnetic stirring oil bath was preheated, and 62g of N,N-dimethylformamide was added to the three-necked reaction flask equipped with the condensation reflux device as a solvent, and then 12.6g of acrylic acid-2,3-epoxypropylene was added. Esteroctadecenoic acid and 18 g acetic acid were reacted at 100 °C for 1 h; the reaction product was treated with an equal volume of distilled water, so that unreacted acetic acid and solvent N,N-dimethylformamide entered the water phase, cooled to room temperature, washed with water and suction filtered Twice to obtain solid intermediate monomer I; take 18g of sodium bisulfite mixed with water, add 10g of monomer I, add 10g of 30% hydrogen peroxide as a catalyst, add a three-necked reaction flask equipped with a condensation reflux device, and react at 60 ° C 1h; after the reaction was completed, it was cooled to below 36°C, washed with water and filtered twice to obtain powdery intermediate monomer II; the zi...

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Abstract

The invention discloses an energized water-based fracturing fluid and a preparation method and application thereof, and relates to the technical field of oilfield fracturing fluids, the preparation method comprises the following steps: adding N, N-dimethylformamide as a solvent, then adding acrylic acid-2, 3-epoxypropyl ester octadecenoic acid and acetic acid, and carrying out a reaction for post-treatment to obtain a solid intermediate monomer I; mixing sodium hydrogen sulfite with water, adding the monomer I, adding a proper amount of catalyst, and treating after reaction to obtain an intermediate monomer II; dropwise adding a zirconium salt solution of zirconium oxychloride into the monomer II solution, and adjusting the pH value to obtain the cross-linking agent. And adding a cross-linking agent into the guanidine gum thickening agent for cross-linking to obtain the fracturing fluid. According to the fracturing fluid, viscosity reducer molecules serve as ligands to synthesize an organic zirconium cross-linking agent, in the cross-linking process, original coordinate bonds in the cross-linking agent are broken to release the viscosity reducer molecules, the strength of the cross-linking agent and the dissolving capacity and emulsifying and dispersing capacity of the cross-linking agent are improved, the viscosity reduction capacity is endowed to the fracturing fluid, the process is simplified, time is shortened, and efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of oil field fracturing fluid, and in particular relates to an energizing water-based fracturing fluid and a preparation method and application thereof. Background technique [0002] The density of crude oil in heavy oil reservoirs is generally 0.9174 ~ 0.9697g.cm -3 , the viscosity of formation crude oil is 294 ~ 6160mPa.s. Under ground conditions, the surface of crude oil has no fluidity. At present, it is exploited by mixing dilute oil to reduce viscosity. However, it is suitable to be used in the case of low water content in the early stage of oilfield development. When entering the water-cut stage, the situation of "mixing with thinning to reduce viscosity" is prone to occur, which is not conducive to improving oil well production, and the process of mixing with dilution is not well controlled, which is easy to cause thickening. The problem of oil return. At the same time, thermal recovery or cold rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L5/00C08K5/00C09K8/68C09K8/90E21B43/26E21B43/22
CPCC08J3/24C09K8/685C09K8/887C09K8/905E21B43/26E21B43/16C08J2305/00C08K5/0091
Inventor 王晨梅秋雨
Owner SHAANXI UNIV OF SCI & TECH
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