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Drag reducing agent for fracturing fluid, preparation method and application

A drag-reducing agent and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low drag-reducing rate of fracturing fluid compositions, and achieve the effect of wide temperature range

Active Publication Date: 2020-05-05
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 reduction rate of fracturing fluid compositions containing drag reducing agents in the prior art, and a drag reducing agent for fracturing fluids suitable for shale gas reservoirs is provided

Method used

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  • Drag reducing agent for fracturing fluid, preparation method and application
  • Drag reducing agent for fracturing fluid, preparation method and application
  • Drag reducing agent for fracturing fluid, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Dissolve 1 part of cetyl dimethyl ammonium glycolate, 0.05 part of cetyl dimethyl tertiary amine, 0.7 part of sodium salicylate into 1200 parts of water (R 1 =R 6 =C 16 h 33 , R 2 =R 3 =R 7 =R 8 =CH 3 , X=Ac), stirred for 0.5 hours to form a uniform and transparent viscoelastic fracturing fluid drag-reducing agent, according to the method for measuring the drag-reducing rate of the present invention, measure the prepared fracturing fluid drag-reducing agent under different flow rates at 80°C The results are shown in Table 1 below.

[0045] Table 1

[0046] Flow(L / min) 10 12 14 16 18 20 η(%) at 80℃ 80.10 80.74 81.33 79.45 77.64 79.88

Embodiment 2

[0052] Dissolve 1 part of cetyl dimethyl ammonium glycolate, 0.05 part of cetyl dimethyl tertiary amine, 0.7 part of sodium salicylate into 1200 parts of water (R 1 =R 6 =C 16 h 33 , R 2 =R 3 =R 7 =R 8 =CH 3 , X=Ac), stirred for 0.5 hours to form a uniform and transparent viscoelastic fracturing fluid drag-reducing agent, according to the method for measuring the drag-reducing rate of the present invention, the prepared fracturing fluid drag-reducing agent was measured at 60 ° C, 8L / min The flow rate drops to 80.62.

Embodiment 3

[0054] Dissolve 1 part of tetradecyl dimethyl ammonium glycolate, 0.05 part of cetyl dimethyl tertiary amine, 0.3 part of 4-sodium methyl salicylate into 1800 parts of water (R 1 =C 14 h 29 , R 2 =R 3 =R 7 =R 8 =CH 3 , R 6 =C 16 h 33 , X=Ac), stirred for 0.5 hours to form a uniform and transparent viscoelastic fracturing fluid drag-reducing agent, according to the method for measuring the drag-reducing rate of the present invention, measure the 10L / min flow rate of the prepared fracturing fluid drag-reducing agent at 60°C The lower resistance reduction rate is 80.35%.

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Abstract

The invention relates to a fracturing-fluid drag reducer and application thereof, and mainly solves the problem of low drag reducing rate in the prior art. The fracturing-fluid drag reducer includes the following components in parts by weight: (1) 1 part of alkyl quaternary ammonium salt surfactant, (2) 0.2-5 parts of counterion salt, and (3) 0.01 to 0.05 part of organic amine, wherein the molecular general formula of the quaternary ammonium salt surfactant is represented by a formula (I), wherein R1 is selected from C12-C26 hydrocarbon groups, R2, R3 and R4 are independently selected from C1-C4 aliphatic groups, and X<-> is any one selected from organic acid radicals; and the counterion salt is selected from structures represented by a formula (II), wherein R5 is selected from H, C1-C4 alkyl groups, C1 to C4 substituted alkyl, n is the number of R5 and is equal to 1 to 4, and Z is sulfonate radical or carboxylate radical. The technical scheme of the invention solves the above problemwell and can be used in the process of shale gas exploitation.

Description

technical field [0001] The invention relates to a drag reducing agent for fracturing fluid and its application. 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 shale gas enrichment are superior and have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K2208/28
Inventor 张卫东吴欣悦李应成沙鸥鲍新宁张立何立
Owner CHINA PETROLEUM & CHEM CORP