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Fluorine-containing amphiphilic polymer viscosity reducer for crude oil and preparation method thereof

A technology of crude oil viscosity reducer and amphiphilic polymer, which is applied in the field of fluorine-containing amphiphilic polymer crude oil viscosity reducer and its preparation, can solve the problems of poor resistance to mineral salt, etc., and achieve low production cost, easy operation, and high technology easy effect

Active Publication Date: 2012-07-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Petroleum sulfonate is cheap and has been successfully applied in some oil fields, but because it is an anionic emulsifying viscosity reducer, it has poor resistance to mineral salts
Although the method of compounding anionic and nonionic surfactants can partially solve this problem, the use of nonionic-anionic compound viscosity reducers will cause "chromatographic" separation in the formation, and the failure of the compound system cannot be avoided. Properties and states change in formations

Method used

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  • Fluorine-containing amphiphilic polymer viscosity reducer for crude oil and preparation method thereof
  • Fluorine-containing amphiphilic polymer viscosity reducer for crude oil and preparation method thereof
  • Fluorine-containing amphiphilic polymer viscosity reducer for crude oil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, preparation fluorine-containing amphiphilic polymer crude oil viscosity reducer

[0026] 1) 25g of acrylamide, 7.24g of acrylic acid and 0.1056g of CH 2 =CHCOOCH 2 (CF 2 CF 2 ) 3 The perfluoroalkyl acrylate monomer represented by F was dissolved in 50 g of water, and stirred until uniformly mixed to obtain an aqueous phase solution;

[0027] 2) Add 50g cyclohexane, 25g emulsifier (wherein each 12.5g of sorbitan oleate Span80 and polyoxyethylene sorbitan stearate Tween60) and 0.1125g initiator couple Nitroisobutyronitrile AIBN, and stirred at a stirring speed of 15000r / min for 20min to mix to obtain a stable water-in-oil emulsion; in this water-in-oil emulsion, the mass percentage of cyclohexane is 32 %, the mass percentage of the mixture of Span80 and Tween60 is 16%; the mass percentage of AIBN is 0.07%;

[0028] 3) adding alkali sodium hydroxide to the above stable water-in-oil microemulsion to adjust the pH value to 9;

[0029] 4) The above stable...

Embodiment 2

[0036] Embodiment 2, preparation fluorine-containing amphiphilic polymer crude oil viscosity reducer

[0037] 1) 25g acrylamide, 9.5g acrylic acid and 0.2112g CH 2 =CHCOO(CH 2 ) 3 (CF 2 CF 2 ) 6 The perfluoroalkyl acrylate monomer shown in F was dissolved in 50 g of water, and stirred until uniformly mixed to obtain an aqueous phase solution;

[0038] 2) Add 50g cyclohexane, 25g emulsifier (12.5g each of Span80 and Tween60) and 0.2250g initiator AIBN to the above-mentioned solution containing the aqueous phase, and stir at a stirring speed of 10000r / min for 40min until mixed to obtain a stable Water-in-oil emulsion; In this water-in-oil emulsion, the mass percentage of cyclohexane is 31%, the mass percentage of the mixture of Span80 and Tween60 is 15.5%; the mass percentage of AIBN is 0.14%;

[0039] 3) adding alkali sodium hydroxide to the above stable water-in-oil microemulsion to adjust the pH value to 9.5;

[0040] 4) The above stable water-in-oil microemulsion was...

Embodiment 3

[0047] Embodiment 3, preparation fluorine-containing amphiphilic polymer crude oil viscosity reducer

[0048] 1) 25g of acrylamide, 7.32g of acrylic acid and 0.1584g of CH 2 =CHCOO(CH 2 ) 3 (CF 2 CF 2 ) 6 The perfluoroalkyl acrylate monomer shown in F was dissolved in 50 g of water, and stirred until uniformly mixed to obtain an aqueous phase solution;

[0049] 2) Add 50g cyclohexane, 25g emulsifier (12.5g each of Span80 and Tween60) and 0.1687g initiator AIBN to the above-mentioned solution containing the aqueous phase, and stir at a stirring speed of 7500r / min for 30min until mixed to obtain a stable Water-in-oil emulsion; In this water-in-oil emulsion, the mass percentage of cyclohexane is 32%, the mass percentage of the mixture of Span80 and Tween60 is 16%; the mass percentage of AIBN is 0.11%;

[0050] 3) adding alkali sodium hydroxide to the above stable water-in-oil microemulsion to adjust the pH value to 9.5;

[0051] 4) The above stable water-in-oil microemuls...

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Abstract

The invention discloses a fluorine-containing amphiphilic polymer viscosity reducer for crude oil and a preparation method thereof. The method comprises the steps as follows: (1) a water-soluble monomer and a perfluoroalkyl acrylate monomer are dissolved in water to obtain a water-phase solution, wherein the water-soluble monomer comprises at least one of acrylamide, acrylic acid, acrylonitrile, acrylic ester and allyl alcohol; the structural formula of the perfluoroalkyl acrylate monomer is CH2=CHCOO(CH2)m(CF2CF2)nF, wherein, m is a natural number from 1 to 3 and n is a natural number from 3to 6; (2) cyclohexane, an emulsifier and an initiator are added into the water-phase solution and stirred to obtain water in oil type emulsion liquid; and (3) after a pH (potential of hydrogen) valueof the water in oil type emulsion liquid is adjusted until representing alkalinity, inverse emulsion polymerization is conducted and then the fluorine-containing amphiphilic polymer viscosity reducerfor the crude oil is obtained. The fluorine-containing amphiphilic polymer viscosity reducer for the crude oil, which is provided by the invention, achieves a good emulsion effect on viscous oil, andthe viscosity reduction rate of the viscous oil is larger than or equal to 90 percent.

Description

technical field [0001] The invention relates to a fluorine-containing amphiphilic polymer crude oil viscosity reducer and a preparation method thereof, and belongs to the technical field of crude oil viscosity reducer and preparation thereof. Background technique [0002] In heavy oil, the content of light components is low, the content of asphaltenes and colloids is high, and the content of straight chain hydrocarbons is low, which leads to the characteristics of high viscosity and high density in most heavy oils, making mining and transportation quite difficult. At present, the commonly used viscosity reduction methods at home and abroad in the process of heavy oil production include heating method, thin oil blending method, heavy oil modification and chemical agent viscosity reduction method. Among them, the emulsification viscosity reduction method in the chemical agent viscosity reduction method has received widespread attention. The application of downhole emulsificati...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/24C08F2/32C09K8/584
Inventor 吕鑫梁守成王大威赵娟张健
Owner CHINA NAT OFFSHORE OIL CORP
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