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Shale gas reservoir fracturing fluid drag reducer and preparation method thereof

A technology for shale gas reservoirs and fracturing fluids, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low resistance reduction efficiency and achieve good technical effects

Active Publication Date: 2017-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the low drag-reducing efficiency of fracturing fluid systems containing drag-reducing agents in the prior art, and a drag-reducing agent suitable for fracturing fluid systems in shale gas reservoirs is provided

Method used

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  • Shale gas reservoir fracturing fluid drag reducer and preparation method thereof
  • Shale gas reservoir fracturing fluid drag reducer and preparation method thereof
  • Shale gas reservoir fracturing fluid drag reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Preparation of fracturing fluid drag reducer

[0044] (1) Dissolve octyl dimethyl tertiary amine (1mol) and 1,4-dibromobutane (0.5mol) in 200ml ethanol solution, add dropwise 5wt% sodium hydroxide aqueous solution to control the pH of the system Between 9 and 9.5, react at 65°C for 6 hours. After the reaction was over, the solvent was distilled off to obtain a white solid powder C 8 -4-C 8 .

[0045] (2) Add lauric acid amide monopolyoxyethylene (2) ether (1mol) and benzene (500ml) into a reactor equipped with a stirring and condensing reflux device, add sodium hydroxide powder (2mol), at 65°C Alkaline for 2 hours, add powdered sodium chloroacetate (1.2mol), and reflux for 6 hours. Then add 300ml of water, adjust the pH=2 with hydrochloric acid with a concentration of 18wt%, static layering, separate the organic phase, continue to wash the organic phase with 500ml, pH=2 hydrochloric acid aqueous solution, static layering, separate the organic phase, evaporate Re...

Embodiment 2

[0052] 1. Preparation of fracturing fluid drag reducer

[0053] (1) Dissolve dodecyldimethyl tertiary amine (1mol) and 1,4-dibromoethane (0.5mol) in 200ml ethanol solution, add dropwise sodium hydroxide aqueous solution with a concentration of 5wt% to control the system The pH is between 9 and 9.5, and the reaction is carried out at 65°C for 6 hours. After the reaction was over, the solvent was distilled off to obtain a white solid powder C 12 -2-C 12 .

[0054] (2) Add lauric acid amide monopolyoxyethylene (2) ether (1mol) and benzene (500ml) into a reactor equipped with a stirring and condensing reflux device, add sodium hydroxide powder (2mol), at 65°C Alkaline for 2 hours, add powdered sodium chloroacetate (1.2mol), and reflux for 6 hours. Then add 300ml of water, adjust the pH=2 with hydrochloric acid with a concentration of 18wt%, static layering, separate the organic phase, continue to wash the organic phase with 500ml, pH=2 hydrochloric acid aqueous solution, stati...

Embodiment 3

[0059] 1. Preparation of fracturing fluid drag reducer

[0060] (1) Dissolve dodecyldimethyl tertiary amine (1mol) and 1,6-dibromohexane (0.5mol) in 200ml ethanol solution, add dropwise sodium hydroxide aqueous solution with a concentration of 5wt% to control the system The pH is between 9 and 9.5, and the reaction is carried out at 65°C for 6 hours. After the reaction was over, the solvent was distilled off to obtain a white solid powder C 12 -6-C 12 .

[0061] (2) Add palmitic acid amide monopolyoxyethylene (2) ether (1mol) and benzene (500ml) into a reactor equipped with a stirring and condensing reflux device, add sodium hydroxide powder (2mol), at 65°C Alkaline for 2 hours, add powdered sodium chloroacetate (1.2mol), and reflux for 6 hours. Then add 300ml of water, adjust the pH=2 with hydrochloric acid with a concentration of 18wt%, static layering, separate the organic phase, continue to wash the organic phase with 500ml, pH=2 hydrochloric acid aqueous solution, sta...

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Abstract

The invention relates to a drag reducer for fracturing fluid and a preparation method thereof. The invention mainly solves the problem that drag reduction rate is low in the prior art. The drag reducer for fracturing fluid comprises the following components, by weight, (1) a part of a quaternary ammonium salt dimeric surfactant; (2) 0.01-100 parts of alkyl amido mono-polyoxyethylene ether carboxylate; and (3) 10-10,000 parts of water. The general molecular formula of the component (1) is as defined in the specification; and the general molecular formula of the component (2) is as defined in the specification, wherein R1, R3 and R6 are respectively an alkyl group with C1-C30; R2 is an alkylene group with C2-C6; R4 and R5 are respectively an alkyl group with C1-C4; Xm- is anion; n=1-10; M is any one selected from alkali metal, alkaline earth metal and NH4; and y is molar ratio of M to COO. When M is alkali metal, y=1; and when M is alkaline earth metal, y=0.5. By the technical scheme, the above problem is solved well. The drag reducer for fracturing fluid can be used in the shale gas recovery process.

Description

technical field [0001] The invention relates to a drag reducing agent suitable for shale gas reservoir fracturing fluid and a preparation method thereof. Background technique [0002] Shale gas refers to the accumulation of natural gas mainly located in dark mud shale or high-carbon mud shale, mainly in the state of adsorption or free. According to the shale gas recoverable resource base and exploitation potential, shale gas has become the third important resource after tight sandstone gas and coalbed methane. Shale gas reservoirs are characterized by extremely low permeability. More than 90% of shale gas wells need to take stimulation measures such as fracturing to communicate with natural fractures. One of the important factors for economic exploitation is the degree of fracture development. The United States is the first country to develop shale gas. my country and the United States have many similarities in shale gas geological conditions. The geological conditions for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/885C09K2208/28
Inventor 鲍新宁张卫东沙鸥李应成
Owner CHINA PETROLEUM & CHEM CORP