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A self-assembled ultrafine foam oil displacement agent and its preparation method and application

A technology of foam flooding and self-assembly, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc. It can solve the problems of large foam size, low viscosity, poor strength, etc., and reduce the start-up pressure and water injection Effects of increasing pressure, increasing seepage capacity, and enhancing oil recovery

Active Publication Date: 2020-01-31
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although some foam oil displacement agents have been developed, there are still some problems, such as low viscosity in brine, large foam size, poor strength, instability, etc.

Method used

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  • A self-assembled ultrafine foam oil displacement agent and its preparation method and application
  • A self-assembled ultrafine foam oil displacement agent and its preparation method and application
  • A self-assembled ultrafine foam oil displacement agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. A kind of self-assembled microfoam oil displacement agent, comprises the component of following percentage by weight:

[0037] 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium formate)-methine]ammonium bromide: 0.2%,

[0038] Sodium N-(1-dodecyloxyether-2-hydroxy)propane-N-dimethyl-N-(2-hydroxy)propanesulfonate: 0.2%,

[0039] Anionic surfactant is sodium dodecyl sulfate (SDS): 0.1%,

[0040] Triethanolamine: 0.03%,

[0041] Urea: 0.03%,

[0042] Chelating agent is EDTA: 0.14%,

[0043] Inorganic salt: 5%,

[0044] Surplus is water, total amount is 100%,

[0045] Wherein, the structural formula of the 2[N-methylene-N-dimethyl (1-dodecyl-1-sodium formate)-methine] ammonium bromide is: , n=12;

[0046] The structural formula of the N-(1-dodecyloxy ether-2-hydroxyl)propane-N-dimethyl-N-(2-hydroxyl)propanesulfonate sodium is , R=C 12 h 25 .

[0047] The 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium formate)-methine]ammonium bromide and N-(1-dodecyloxyether-2- Hydrox...

Embodiment 2

[0052] 1. A kind of self-assembled microfoam oil displacement agent, comprises the component of following percentage by weight:

[0053] 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium formate)-methine]ammonium bromide: 0.25%,

[0054] Sodium N-(1-dodecyloxyether-2-hydroxy)propane-N-dimethyl-N-(2-hydroxy)propanesulfonate: 0.25%,

[0055] Anionic surfactant is sodium dodecyl sulfate (SDS): 0.2%,

[0056] Triethanolamine: 0.02%,

[0057] Urea: 0.02%,

[0058] Chelating agent is EDTA: 0.04%,

[0059] Inorganic salt: 6%,

[0060] Surplus is water, total amount is 100%,

[0061] Wherein, the 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium formate)-methine]ammonium bromide, N-(1-dodecyloxyether- 2-hydroxyl) propane-N-dimethyl-N-(2-hydroxyl) sodium propanesulfonate structural formula, preparation method are with embodiment 1;

[0062] The inorganic salts are sodium chloride, sodium carbonate, potassium chloride, and calcium chloride, wherein the sodium chloride, sodium carbonate, pota...

Embodiment 3

[0064] 1. A kind of self-assembled microfoam oil displacement agent, comprises the component of following percentage by weight:

[0065] 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium formate)-methine]ammonium bromide: 0.3%,

[0066] Sodium N-(1-dodecyloxyether-2-hydroxy)propane-N-dimethyl-N-(2-hydroxy)propanesulfonate: 0.3%,

[0067] Anionic surfactant is sodium dodecyl sulfate (SDS): 0.35%,

[0068] Triethanolamine: 0.07%,

[0069] Urea: 0.07%,

[0070] Chelating agent is EDTA: 0.10%,

[0071] Inorganic salt: 7%,

[0072] Surplus is water, total amount is 100%,

[0073] Wherein, the 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium formate)-methine]ammonium bromide, N-(1-dodecyloxyether- 2-hydroxyl) propane-N-dimethyl-N-(2-hydroxyl) sodium propanesulfonate structural formula, preparation method are the same as embodiment 1;

[0074] Described inorganic salt is sodium chloride, magnesium chloride, sodium sulfate, sodium bisulfate, sodium carbonate, potassium chloride, calcium c...

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Abstract

The invention provides a self-assembled ultramicro-foam oil-displacing agent. The self-assembled ultramicro-foam oil-displacing agent contains the following components in percentage by weight: 0.2%-0.3% of 2[N-methylene-N-dimethyl(1-dodecyl-1-sodium carboxylate)-methine]ammonium bromide, 0.2%-0.3% of N-(1-dodecyloxy ether-2-hydroxy)propane-N-dimethyl-N-(2-hydroxy)propanesulfonate, 0.1%-0.35% of an anionic surfactant, 0.02%-0.07% of triethanolamine, 0.02%-0.07% of urea, 0.04%-0.14% of a chelating agent, 5%-7% of inorganic salt and the balance of water. The invention further provides a preparation method and application of the oil-displacing agent. The self-assembled ultramicro-foam oil-displacing agent has the beneficial effects that rich and fine foams are produced, the diameter are 1-20 microns, and the half-life period of the foams is relatively long; and when CO2 is introduced for foaming, the phenomenon that CO2 generate chemical reaction with calcium ions and magnesium ions to generate white precipitated calcium carbonate or magnesium hydroxide is avoided.

Description

technical field [0001] The invention belongs to the field of chemical oil displacement, and in particular relates to a self-assembled ultrafine foam oil displacement agent and its preparation method and application. Background technique [0002] Low-permeability reservoirs are widely distributed in my country. These reservoirs generally have the characteristics of "low porosity, low permeability, and low production". Conventional water injection and gas injection methods can improve the development effect of low-permeability reservoirs, but in the middle and late stages of development It is prone to "injection failure", water channeling or gas channeling, and the injection fluid sweep efficiency is low, resulting in low production degree and low recovery factor of low permeability reservoirs. Currently. The commonly used methods are: polymer flooding, alkaline water flooding, and foam flooding. Alkaline water flooding will reduce the viscoelasticity of the system and increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/594E21B43/22E21B43/16
CPCC09K8/584C09K8/594E21B43/16E21B43/164E21B43/168
Inventor 申哲娜洪玲郭肖康宵瑜周明王维波郭茂雷王前荣田宗武刘凯李丝丝邹高峰
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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