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Preparation method of thickening agent, thickening agent, fracturing fluid and application of fracturing fluid

A thickener and fracturing fluid technology, applied in the field of fracturing, can solve the problems of stratum environmental hazards, high toxicity of fluorine element, difficult to degrade, etc., and achieve the effects of reducing production costs, environmental protection, and easy flowback

Inactive Publication Date: 2020-06-19
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the supercritical CO 2 The fracturing fluid has the problem of low viscosity, so it is generally necessary to add a thickener to increase the viscosity
Although, in the prior art, the polymers of fluorine and silicon can be used as supercritical CO 2 Thickener for fracturing fluid, however, fluorine is highly toxic, and polymers containing fluorine and silicon are high in cost and difficult to degrade, which are likely to cause great harm to the formation environment, etc.

Method used

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  • Preparation method of thickening agent, thickening agent, fracturing fluid and application of fracturing fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This embodiment provides a kind of thickener and preparation method thereof, wherein, the preparation method of this thickener comprises the following steps:

[0029] (1) Under a protective gas atmosphere of nitrogen, 3 g of pentaerythritol and 6 g of pyridine were dissolved in 50 g of chloroform to obtain a mixed solution.

[0030] (2) The above-mentioned mixed solution is subjected to magnetic stirring treatment, and at the same time, 20 g of 2-bromopropionyl bromide is slowly added to the mixed solution for sufficient reaction, and then filtered and dried to obtain a brominated precursor; wherein, the stirring of this step The temperature of the treatment was 3° C., and the rotational speed of the stirring treatment was 1000 rpm.

[0031] (3) Dissolving 8 g of the above-mentioned brominated precursor in 120 g of chloroform to obtain a chloroform solution of the brominated precursor.

[0032] (4) Carry out magnetic stirring to the chloroform solution of the above-men...

Embodiment 2

[0037] This embodiment provides a kind of thickener and preparation method thereof, wherein, the preparation method of this thickener comprises the following steps:

[0038] (1) Under a protective gas atmosphere of nitrogen, 5 g of pentaerythritol and 10 g of pyridine were dissolved in 70 g of chloroform to obtain a mixed solution.

[0039] (2) Under the protective gas atmosphere of nitrogen, the above-mentioned mixed solution was subjected to magnetic stirring treatment, and at the same time, 40 g of 2-bromopropionyl bromide was slowly added to the mixed solution to fully react, and then filtered and dried to obtain the brominated solution. body; wherein, the temperature of the stirring treatment in this step is 8° C., and the rotational speed of the stirring treatment is 1500 rpm.

[0040] (3) Under a protective gas atmosphere of nitrogen, 12 g of the above-mentioned brominated precursor was dissolved in 180 g of chloroform to obtain a chloroform solution of the brominated p...

Embodiment 3

[0047] This embodiment provides a kind of thickener and preparation method thereof, wherein, the preparation method of this thickener comprises the following steps:

[0048] (1) Under a protective gas atmosphere of nitrogen, 3 g of pentaerythritol and 6 g of pyridine were dissolved in 60 g of chloroform to obtain a mixed solution.

[0049] (2) Under the protective gas atmosphere of nitrogen, the above-mentioned mixed solution was subjected to magnetic stirring treatment, and at the same time, 30 g of 2-bromopropionyl bromide was slowly added to the mixed solution to fully react, and then filtered and dried to obtain the brominated solution. body; wherein, the temperature of the stirring treatment in this step is 5° C., and the rotational speed of the stirring treatment is 1200 rpm.

[0050] (3) Under a protective gas atmosphere of nitrogen, 10 g of the above-mentioned brominated precursor was dissolved in 150 g of chloroform to obtain a chloroform solution of the brominated pr...

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Abstract

The invention discloses a preparation method of a thickening agent, the thickening agent, a fracturing fluid and application of the fracturing fluid, and belongs to the technical field of fracturing.The preparation method of the thickening agent comprises the following steps: dissolving pentaerythritol and pyridine in trichloromethane in a protective gas atmosphere, stirring, slowly adding 2-bromopropionyl bromide, reacting, filtering, and drying to obtain a brominated precursor; dissolving the brominated precursor in trichloromethane, stirring, adding potassium ethyl xanthate, reacting, filtering, and drying to obtain a chain transfer agent; carrying out a polymerization reaction on the chain transfer agent, a polymer monomer and an initiator to obtain a reaction product; and dissolvingthe reaction product with ethyl acetate, precipitating with n-hexane, and then carrying out solvent volatilization and drying treatment to obtain the thickening agent. The thickening agent is non-toxic and environment-friendly, and the viscosity of a supercritical CO2 fracturing fluid can be greatly improved when the thickening agent and ethanol are used as a cosolvent.

Description

technical field [0001] The invention relates to the technical field of fracturing, in particular to a preparation method of a thickener, a thickener, a fracturing fluid and applications. Background technique [0002] With the increasing intensity of exploration and development of oil and gas fields, unconventional oil and gas resources have become the focus of development at home and abroad. Unconventional oil and gas resources are a type of clean and high-quality energy, among which unconventional natural gas such as tight gas and shale gas have huge exploitation potential. [0003] In addition, hydraulic fracturing is an important means of shale gas exploitation, but for the characteristics of poor physical properties and low permeability of shale gas reservoirs, conventional fracturing fluids have the problem of incomplete gel breaking, which can easily cause pore blockage. while supercritical CO 2 Fracturing fluid has gradually emerged as a new type of fracturing fluid...

Claims

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Application Information

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IPC IPC(8): C08F118/08C08F2/38C09K8/62C09K8/70
CPCC08F2/38C08F118/08C09K8/62C09K8/70Y02P20/54
Inventor 张烨王彦玲巩锦程蒙春贺培高磊蔡永志陆朝晖张健强张义
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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