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A low interfacial tension strong foam oil displacement agent

A technology of interfacial tension and foam flooding, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of no profile control effect, no oil washing effect, etc., and achieve the effect of high foam performance and good interface activity

Active Publication Date: 2022-02-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional surfactants can reduce the oil-water interfacial tension and improve the oil washing effect, but have no profile control effect; while conventional foaming agents have the effect of profile control and plugging, and improve the sweep coefficient, but have no obvious oil washing effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment provides a low interfacial tension strong foam oil displacement agent. In terms of mass percentage, the low interfacial tension strong foam oil displacement agent system includes: 15% anionic and cationic surfactants, 10% alkyl amidopropyl hydroxyl Propyl sultaine (specific structure: CH 3 (CH 2 ) n CONH(CH 2 ) 3 N + (CH 3 ) 2 CH 2 CH(OH)CH 2 SO 3 , where n=10), 5% polyoxyethylene ether fatty alcohol (the specific structure is: R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 8 carbons, x is 3), and the balance is water. Wherein the anionic and cationic surfactants are composed of sodium dodecylbenzenesulfonate and cetyltrimethylammonium chloride according to the material ratio of 1:1.

Embodiment 2

[0020] This embodiment provides a low interfacial tension strong foam oil displacement agent, in terms of mass percentage, the low interfacial tension strong foam oil displacement agent system includes: 35% anionic and cationic surfactants, 30% hydroxy sulfopropyl betaine (The specific structure is: CH 3 (CH 2 ) n N + (CH 3 ) 2 CH 2 CH(OH)CH 2 SO 3 , where n=7), 5% polyoxyethylene ether fatty alcohol (the specific structure is: R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 10 carbons, x is 8), and the balance is water. Wherein the anionic and cationic surfactants are composed of petroleum sulfonate and octadecyltrimethylammonium chloride according to the material ratio of 0.25:1.

Embodiment 3

[0022] This embodiment provides a low interfacial tension strong foam oil displacement agent. In terms of mass percentage, the low interfacial tension strong foam oil displacement agent system includes: 25% anionic and cationic surfactants, 20% alkyl amidopropyl hydroxyl Propyl sultaine (specific structure: CH 3 (CH 2 ) n CONH(CH 2 ) 3 N + (CH 3 ) 2 CH 2 CH(OH)CH 2 SO 3 , where n=17), 5% polyoxyethylene ether fatty alcohol (the specific structure is: R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 10 carbons, x is 4), and the balance is water. Wherein the anionic and cationic surfactants are composed of sodium dodecylsulfonate and dodecyltrimethylammonium chloride according to the material ratio of 5:1.

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PUM

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Abstract

The invention provides a low interfacial tension strong foam oil displacement agent. Contains the following components by mass percentage: 15%-35% of anionic and cationic surfactants, 10%-30% of betaine surfactants containing sulfonic acid groups, 5%-15% of polyoxyethylene ethers class of nonionic surfactants, with the balance being water. The low interfacial tension strong foam oil displacement agent has good interfacial activity and high foam performance, and can reduce the oil-water interfacial tension to 10 ‑3 mN / m level, effectively carry out profile control and oil displacement, and improve oil well recovery.

Description

technical field [0001] The invention belongs to the technical field of oil field chemical flooding, and relates to a low interfacial tension strong foam oil flooding agent. Background technique [0002] With the continuous increase of the world's energy demand, the effective development and utilization of oil has attracted great attention, and the requirements for the efficiency of oil extraction are also getting higher and higher. Conventional oil recovery methods (primary oil recovery and secondary oil recovery) generally can only recover 1 / 3 of the geological reserves. Using tertiary oil recovery technology to improve the recovery of oil reservoirs has become a major topic in oil recovery research. Chemical flooding is a very important and large-scale technology in tertiary oil recovery technology. Chemical flooding includes polymer flooding, surfactant flooding, alkaline water flooding and the combined technology of polymer, alkali and surfactant. [0003] The use of c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/60C09K8/94
CPCC09K8/584C09K8/604C09K8/94
Inventor 王康袁俊秀靳志超封心领徐冬梅
Owner CHINA PETROLEUM & CHEM CORP