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Hydrophobic associative polymer-surfactant binary composition and composite flooding system thereof

A composite surfactant and surfactant technology, which can be used in drilling compositions, production fluids, wellbore/well components, etc., can solve problems such as affecting the poly-surface binary composite flooding and increasing the viscosity of the system.

Active Publication Date: 2018-07-24
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 that in the prior art, hydrophobic association polymers are compounded with existing surfactants. When the concentration of surfactants is high, the viscosity of the compounded system decreases and affects the poly-surface binary compound flooding. The problem of oil displacement efficiency, a kind of hydrophobic association polymer-surfactant composition is provided, in this composition, along with the compound surfactant concentration increases, system viscosity increases, when the compound surfactant concentration is bigger (especially The concentration of the composite surfactant is greater than the concentration of the hydrophobic association polymer), and the system concentration can still increase continuously, which has the advantages of high-efficiency viscosity increase and enhanced recovery

Method used

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  • Hydrophobic associative polymer-surfactant binary composition and composite flooding system thereof
  • Hydrophobic associative polymer-surfactant binary composition and composite flooding system thereof
  • Hydrophobic associative polymer-surfactant binary composition and composite flooding system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The components and content (wt%) of binary compound flooding:

[0065] Hydrophobic association polymer: 0.05~0.15;

[0066] Composite surfactant: 0.1~0.5;

[0067] Water: 99.35 ~ 99.85.

[0068] Hydrophobic association polymer: the degree of hydrolysis is 23%, the polyacrylamide (namely x:y:z=76:23:1, M 2 =Na + ).

[0069] Each component and content (wt%) of composite surfactant:

[0070] Oleamidopropyl Betaine (R1 =C 17 , R 2 =C 3 , R 3 , R 4 =C 1 , R 5 =C 1 , A is COO - ): 40;

[0071] Cetyl dimethyl betaine (R 6 =C 16 , R 7 , R 8 =C 1 , R 9 =C 1 , B is COO - ): 30;

[0072] Sodium Salicylate: 30.

[0073] Binary compound flooding system preparation: under the conditions of 50°C and 600rpm rotation speed, the above hydrophobic association polymer was dissolved in simulated water or oil field water to prepare a polymer mother liquor with a concentration of 0.5%. At room temperature, mix oleic acid amidopropyl betaine, cetyl dimethyl betaine and...

Embodiment 2

[0075] The components and content (wt%) of binary compound flooding:

[0076] Hydrophobic association polymer: 0.05~0.15;

[0077] Composite surfactant: 0.1~0.5;

[0078] Water: 99.35 ~ 99.85.

[0079] Hydrophobic association polymer: the degree of hydrolysis is 20%, the polyacrylamide (that is x:y:z=79.2:20:0.8, M 2 =Na + ).

[0080] Each component and content (wt%) of composite surfactant:

[0081] Erucamidopropyl Betaine (R 1 =C 21 , R 2 =C 3 , R 3 , R 4 , R 5 =C 1 , A is COO - ): 42;

[0082] Octadecyldimethylbetaine (R 6 =C 18 , R 7 , R 8 , R 9 =C 1 , B is COO - ): 28;

[0083] Sodium p-toluenesulfonate: 30.

[0084] Binary compound flooding system preparation: under the conditions of 50°C and 600rpm rotation speed, the above hydrophobic association polymer was dissolved in simulated water or oil field water to prepare a polymer mother liquor with a concentration of 0.5%. At room temperature, mix erucamidopropyl betaine, octadecyldimethyl betaine a...

Embodiment 3

[0086] The components and content (wt%) of binary compound flooding:

[0087] Hydrophobic association polymer: 0.05~0.15;

[0088] Composite surfactant: 0.1~0.5;

[0089] Water: 99.35 ~ 99.85.

[0090] Hydrophobic association polymer: degree of hydrolysis is 22%, polyacrylamide (ie x:y:z=76.6:22:1.4, M 2 = K + ).

[0091] Each component and content (wt%) of composite surfactant:

[0092] Cocamidopropyl Betaine (R 1 =C 7 ~C 17 , R 2 =C 3 , R 3 , R 4 =C 1 , R 5 =C 2 , A is SO 3 - ): 36;

[0093] tetradecyl dimethyl betaine (R 6 =C 14 , R 7 , R 8 =C 1 , R 9 =C 2 , B is SO 3 - ): 34;

[0094] Sodium Benzoate: 30.

[0095] Binary compound flooding system preparation: under the conditions of 50°C and 600rpm rotation speed, the above hydrophobic association polymer was dissolved in simulated water or oil field water to prepare a polymer mother liquor with a concentration of 0.5%. At room temperature, mix cocamidopropyl betaine, myristyl dimethyl betaine a...

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Abstract

The invention relates to a hydrophobic associative polymer-surfactant binary composition for chemical oil flooding and a composite flooding system thereof, and mainly solves the problem that when a hydrophobic associative polymer existing in the prior art is compounded with a surfactant existing in the prior art, and the concentration of the surfactant is large, the viscosity of the compound system is reduced to affect the oil flooding efficiency of the polymer-surfactant binary composite flooding system, the problem can be well solved by the hydrophobic associative polymer-surfactant binary composition, and the hydrophobic associative polymer-surfactant binary composition can be used in oil recovery in an oil fields. The hydrophobic associative polymer-surfactant binary composition includes the following components: 1) a hydrophobic associative polymer comprising an acrylamide unit and a hydrophobic monomer unit; and 2) a composite surfactant comprising alkyl amido betaine, alkylbetaine and an aromatic acid salt in a mass ratio of (1 to 60): (1 to 60) :(20 to 60); wherein the mass ratio of the hydrophobic associative polymer to the composite surfactant is (0.5 to 3): (0.1 to 5).

Description

technical field [0001] The invention relates to a hydrophobic association polymer-surfactant binary composition for chemical oil flooding and a composite flooding system thereof. Background technique [0002] With the development of society and economy, the contradiction between supply and demand of oil has become increasingly prominent. Rational development and utilization of existing oil reserves and improvement of oil extraction efficiency are effective ways to solve this contradiction, and are of great significance to the sustainable, stable and healthy development of society. Conventional oil recovery methods (primary oil recovery and secondary oil recovery) can only recover 15% to 50% of crude oil. Tertiary oil recovery can increase oil recovery by 6% to 20%, or even more, through enhanced oil recovery measures. Tertiary oil recovery is divided into four categories: thermal flooding, gas flooding, chemical flooding and microbial oil recovery. Chemical flooding is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588E21B43/22
CPCC09K8/584C09K8/588E21B43/16
Inventor 吴春芳李应成沙鸥
Owner CHINA PETROLEUM & CHEM CORP
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