Clean and environment-friendly type compound thickening agent for fracturing fluid and preparation method

A compound thickener, clean and environmentally friendly technology, applied in chemical instruments and methods, drilling compositions, other chemical processes, etc., can solve the problems of low viscosity, low gel strength, etc., achieve less system, easy to degrade, The effect of the value of good practical application

Inactive Publication Date: 2018-10-12
禹王投资控股集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the most commonly used thickeners for formation fracturing are guar gum and the chemically modified products of guar gum. Since guar gum and the chemically modified products of guar gum have high viscosity and small static shear force, the Shear rheology is good, which is good for construction. Therefore, the amount of guar gum is the largest, but the main production area of ​​guar gum is in India. There is Tianqing gum with a similar structure in China, but compared with guar gum, Tianqing gum has a lower viscosity and is more gelatinous. low intensity

Method used

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  • Clean and environment-friendly type compound thickening agent for fracturing fluid and preparation method
  • Clean and environment-friendly type compound thickening agent for fracturing fluid and preparation method
  • Clean and environment-friendly type compound thickening agent for fracturing fluid and preparation method

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preparation example Construction

[0051] In yet another specific embodiment of the present invention, the preparation method of the aminohydroxyethyl polyacrylamide comprises:

[0052] (1) Slowly add glyoxal into the aqueous solution of polyacrylamide at 45-55°C until the mixture is completely uniform, and keep it in this temperature range for 1.5-2.5 hours to obtain an aqueous solution of hydroxyethyl polyacrylamide;

[0053] (2) Slowly add ethylenediamine to the aqueous solution of hydroxyethyl polyacrylamide prepared in step (1) at 45-55°C until the mixture is completely uniform, and then react at 75-85°C for 2.5-3.5 hours to obtain amine Hydroxyethyl polyacrylamide.

[0054] In yet another specific embodiment of the present invention, in the step (1),

[0055] The polyacrylamide aqueous solution is 1%~3% (mass fraction) polyacrylamide aqueous solution (preferably 2%);

[0056] The molar ratio of polyacrylamide to glyoxal is 1 to 3:1 (preferably 2:1);

[0057] In yet another specific embodiment of the pr...

Embodiment 1

[0080] 1. The formula of the compound thickener for clean and environment-friendly fracturing fluid is as follows, in parts by mass:

[0081]

[0082] 2. Synthetic method of synthetic polymer (amino hydroxyethyl polyacrylamide)

[0083] A. Make polyacrylamide into a 2% aqueous solution, add glyoxal to the 2%-polyacrylamide aqueous solution, and the molar ratio of polyacrylamide to glyoxal is 1:0.5. Add glyoxal to the aqueous solution of polyacrylamide dropwise at 50°C until the mixture is completely uniform, and keep at 50(±5)°C for 2 hours to obtain an aqueous solution of hydroxyethyl polyacrylamide.

[0084] B. Add ethylenediamine to hydroxyethyl polyacrylamide (the molar ratio of ethylenediamine to hydroxyethyl polyacrylamide is 1:1), and dropwise add ethylenediamine to the hydroxyethyl group in step A at 50°C In the polyacrylamide aqueous solution, react at 80 (±5)°C for 3 hours until the mixture is completely uniform to prepare aminohydroxyethyl polyacrylamide.

[00...

Embodiment 2

[0089] 1. The formula of the compound thickener for clean and environment-friendly fracturing fluid is as follows, according to the mass fraction,

[0090]

[0091] 2. Synthetic method of synthetic polymer (amino hydroxyethyl polyacrylamide)

[0092] A. Make polyacrylamide into a 4% aqueous solution, add glyoxal to the 4% polyacrylamide aqueous solution, and the molar ratio of polyacrylamide to glyoxal is 1:0.5. Add glyoxal to the aqueous solution of polyacrylamide dropwise at 50°C until the mixture is completely uniform, and keep at 50(±5)°C for 2 hours to obtain an aqueous solution of hydroxyethyl polyacrylamide.

[0093] B. Add ethylenediamine to hydroxyethyl polyacrylamide (the molar ratio of ethylenediamine to hydroxyethyl polyacrylamide is 1:1), and dropwise add ethylenediamine to the hydroxyethyl group in step A at 50°C In the polyacrylamide aqueous solution, react at 80 (±5)°C for 3 hours until the mixture is completely uniform to prepare aminohydroxyethyl polyacry...

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Abstract

The invention provides a clean and environment-friendly type compound thickening agent for fracturing fluid and a preparation method. The compound thickening agent is prepared from amido hydroxyethylpolyacrylamide, vegetable gelatin, xanthan gum, fungus cellulose enzyme, ethylene diamine tetraacetic acid disodium and sodium sulfate. The clean and environment-friendly type compound thickening agent for the fracturing fluid prepared in the invention has relatively strong thickening, temperature-resistant and anti-shear ability, is good in suspended sand-carrying ability and friction-reducing performance, easy for gel breaking and flowback, high in fracturing success rate and easier to degrade after flowing back to the ground, and does not cause pollution to the environment; meanwhile, the compound thickening agent is fewer in system ingredients and configuration links and easy for controlling quality, and can be compounded when needing to be used, the prepared compound thickening agentfor the fracturing fluid is stable in performance, can maintain a liquid state with a certain viscosity for a long time, and does not generate stratification or sediment; therefore, the application fields of the compound thickening agent are expanded, and the compound thickening agent has a good industrialized application prospect and practical application value.

Description

technical field [0001] The invention belongs to the technical field of thickeners required by conventional and unconventional oil and gas fracturing technologies, and in particular relates to a clean and environment-friendly composite thickener for fracturing fluid and a preparation method thereof. Background technique [0002] The purpose of formation fracturing technology is to increase formation permeability through fracturing to achieve the purpose of increasing production of conventional and unconventional oil and gas reservoirs. When configuring the fracturing system, the thickener is used as the main raw material for gel formation (accounting for more than 95%), and cross-linking agents and other additives are used to make the thickener form a gel-like substance, which carries sand into the formation after fracturing gap. After the sand is carried, it needs to be returned to the ground. The more thorough the flowback, the less residue and the less damage to undergrou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/66C09K8/88C09K3/00
CPCC09K3/00C09K8/665C09K8/68C09K8/882
Inventor 刘汝萃萧漫子辛寅昌姜云康张恒明
Owner 禹王投资控股集团有限公司
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