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Composite carbon dioxide fracturing fluid and preparation method thereof

A technology of carbon dioxide and gaseous carbon dioxide, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of poor temperature resistance and shear resistance of fracturing fluid, reduced oil and gas stimulation effect, and the existence of more insolubles and other problems, to achieve the effect of improving fluidity, easy toxicity, solubility and stability

Active Publication Date: 2022-01-04
SHANDONG DESHI CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] One of the characteristics of my country's oil and gas resources is the wide distribution of low-permeability oil and gas reservoirs. Fracturing is usually used to increase the recovery of low-permeability reservoir resources. The existing water-based fracturing fluids will have low flowback, Disadvantages such as high pollution are mainly manifested in the fact that part of the water-based fracturing fluid will stay inside the formation during the fracturing process, which will block the formation, thereby reducing the effect of oil and gas stimulation
[0003] The composite fracturing fluid based on liquefied carbon dioxide can overcome the shortcomings of water-based fracturing fluids, and can be used for fracturing and mining low-permeability, low-pressure or water-sensitive oil and gas reservoirs, which can reduce the damage to the formation. Some carbon dioxide fracturing fluids have low viscosity and complex formulations, so more foam stabilizers need to be added to stabilize the fracturing performance of the fracturing fluid
The currently used thickening agent is mainly guar gum, which has poor solubility in carbon dioxide, and there are many insolubles, which lead to poor temperature resistance and shear resistance of the fracturing fluid, and are greatly affected in use. limits

Method used

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  • Composite carbon dioxide fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Preparation of the first monomer: Dissolve 90.0g N,N-diethyl-2-chloroacetamide in 150.0g pyridine to obtain solution I, then dissolve 100.0g 4-hydroxybutyl vinyl ether in 200.0g Solution II was obtained in pyridine, and solution I was added dropwise to solution II, and reacted in an ice-water bath for 4 hours. After purification and drying, intermediate A was obtained. Weighed 100.0g intermediate A and 150.0g 1,4-butane sultone Dissolve in a mixture of 300.0g methanol and acetone, the weight ratio of methanol and acetone is 1:1, react at 80°C for 6h to obtain the first monomer;

[0054] (2) Preparation of the second monomer: Dissolve 120.0g of 9-decenal and 100.0g of phenylamine in 300.0g of isopropanol, add glacial acetic acid and react at 30°C for 3 hours to obtain the second monomer;

[0055] (3) Preparation of thickener: Dissolve 40.0g of the first monomer and 10.0g of the second monomer in 50.0g of dimethyl sulfoxide, raise the temperature to 85°C, add 0.5g of ...

Embodiment 2

[0058] (1) Preparation of the first monomer: Dissolve 100.0g N,N-diethyl-2-chloroacetamide in 150.0g pyridine to obtain solution I, then dissolve 100.0g 4-hydroxybutyl vinyl ether in 200.0g Solution II was obtained in pyridine, and solution I was added dropwise to solution II, and reacted in an ice-water bath for 4 hours. After purification and drying, intermediate A was obtained. Weighed 100.0g of intermediate A and 150.0g of 1,4-butane sultone In a mixed solution of 300.0g methanol and acetone, the weight ratio of methanol and acetone is 1:1, react at 80°C for 6h to obtain the first monomer;

[0059] (2) (3) (4) The same as in Example 1 to obtain fracturing fluid 2#.

Embodiment 3

[0061] (1) Preparation of the first monomer: Dissolve 90.0g N,N-diethyl-2-chloroacetamide in 150.0g pyridine to obtain solution I, then dissolve 100.0g 4-hydroxybutyl vinyl ether in 200.0g Solution II was obtained in pyridine, and solution I was added dropwise to solution II, and reacted in an ice-water bath for 4 hours. After purification and drying, intermediate A was obtained. Weighed 100.0g intermediate A and 120.0g 1,4-butane sultone Dissolve in a mixture of 300.0g methanol and acetone, the weight ratio of methanol and acetone is 1:1, react at 80°C for 6h to obtain the first monomer;

[0062] (2) (3) (4) The same as in Example 1 to obtain fracturing fluid 3#.

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Abstract

The invention discloses a composite carbon dioxide fracturing fluid and a preparation method thereof, belonging to the technical field of carbon dioxide fracturing. The composite carbon dioxide fracturing fluid comprises the following components in parts by weight: 10-20 parts of gaseous carbon dioxide, 0.1-2 parts of a thickening agent, 0.2-4 parts of ethanol and 80-100 parts of liquid carbon dioxide, wherein the thickening agent is obtained through polymerization of a first monomer and a second monomer, the first monomer is obtained through a reaction of N,N-diethyl-2-chloroacetamide, 4-hydroxybutyl vinyl ether and 1,4-butyl sultone, and the second monomer is obtained through a reaction of 9-decenal and benzylamine. The fracturing fluid is simple in formula, convenient to construct on site and small in damage to strata; and the thickening agent is formed by polymerizing the first monomer and the second monomer, is good in solubility in carbon dioxide, has excellent sand-carrying capacity and can remarkably improve the temperature resistance and shear resistance of the fracturing fluid.

Description

technical field [0001] The application relates to a composite carbon dioxide fracturing fluid and a preparation method thereof, belonging to the technical field of carbon dioxide fracturing. Background technique [0002] One of the characteristics of my country's oil and gas resources is the wide distribution of low-permeability oil and gas reservoirs. Fracturing is usually used to increase the recovery of low-permeability reservoir resources. The existing water-based fracturing fluids will have low flowback, Disadvantages such as high pollution are mainly manifested in the fact that part of the water-based fracturing fluid will stay inside the formation during the fracturing process, which will block the formation, thereby reducing the effect of oil and gas stimulation. [0003] The composite fracturing fluid based on liquefied carbon dioxide can overcome the shortcomings of water-based fracturing fluids, and can be used for fracturing and mining low-permeability, low-pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/70C09K8/88C09K8/94C09K8/66C08F216/14C08F226/02
CPCC09K8/68C09K8/703C09K8/882C09K8/94C09K8/665C08F216/1491C08F226/02
Inventor 崔仕章宋新旺崔盈贤刘小芳郑志微
Owner SHANDONG DESHI CHEM IND CO LTD
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