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Foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2

A foaming agent and gas channeling technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem that the oil displacement foaming agent cannot meet the requirements of blocking gas channeling, so as to improve the effect of CO2 flooding, Enhanced oil recovery and strong foaming ability

Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for CO 2 Foaming agent for blocking gas channeling in oil flooding, solving existing CO 2 The problem that the oil displacement foaming agent cannot meet the requirements of plugging gas channeling

Method used

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  • Foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2
  • Foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2
  • Foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The CO used in this example 2 The foaming agent for blocking gas channeling in oil flooding is characterized in that it consists of the following components by weight: 1.52g of α-olefin sulfonate, 0.76g of carboxylic acid imidazoline amphoteric surfactant, dodecyl di Methyl betaine 1.52g, alkanolamide 0.20g, pure water 996.0g.

[0030] Wherein, the chemical formula of α-olefin sulfonate is:

[0031] C 12 h 25 CH=CHCH 2 SO 3 Na.

[0032] The chemical formula of carboxylic acid type imidazoline amphoteric surfactant is:

[0033]

[0034] The chemical formula of alkanolamide is:

[0035] C 11 h 23 CON(CH 2 CH 2 Oh) 2 .

[0036] The CO used in this example 2 The preparation method of the foaming agent for blocking gas channeling in oil flooding is: accurately weigh 1.52g of α-olefin sulfonate, 0.76g of carboxylic acid type imidazoline amphoteric surfactant, dodecyl dimethyl betaine 1.52 g and 0.20 g of alkanolamide were successively dissolved in 996.0 g of...

Embodiment 2

[0038] The CO used in this example 2 The foaming agent for blocking gas channeling in oil displacement is characterized in that it consists of the following components by weight: α-olefin sulfonate 1.90g, carboxylic acid imidazoline amphoteric surfactant 0.95g, dodecyl di Methyl betaine 1.90g, alkanolamide 0.25g, simulated brine 995.0g.

[0039] Wherein, the chemical formula of α-olefin sulfonate is:

[0040] C 11 h 23 CH=CHCH 2 SO 3 Na.

[0041] The chemical formula of carboxylic acid type imidazoline amphoteric surfactant is:

[0042]

[0043] The chemical formula of alkanolamide is:

[0044] C 11 h 23 CON(CH 2 CH 2 Oh) 2 .

[0045] The simulated brine contains the following components by weight percentage: NaCl7.38%, CaCl 2 0.87%, Na 2 SO 4 1.17%, MgCl 20.58%, total salinity 10×10 4 mg / L.

[0046] The CO used in this example 2 The preparation method of the foaming agent for blocking gas channeling in oil displacement is: accurately weigh 1.90 g of α-o...

Embodiment 3

[0048] The CO used in this example 2 The foaming agent for blocking gas channeling in oil flooding is characterized in that it consists of the following components by weight: 2.66g of α-olefin sulfonate, 1.33g of carboxylic acid imidazoline amphoteric surfactant, dodecyl di Methyl betaine 2.66g, alkanolamide 0.35g, pure water 993.0g.

[0049] Wherein, the chemical formula of α-olefin sulfonate is:

[0050] C 12 h 25 CH=CHCH 2 SO 3 Na.

[0051] The chemical formula of carboxylic acid type imidazoline amphoteric surfactant is:

[0052]

[0053] The chemical formula of alkanolamide is:

[0054] C 11 h 23 CON(CH 2 CH 2 Oh) 2 .

[0055] The CO used in this example 2 The preparation method of the foaming agent for blocking gas channeling in oil displacement is: accurately weigh 2.66g of α-olefin sulfonate, 1.33g of carboxylic acid type imidazoline amphoteric surfactant, dodecyl dimethyl betaine 2.66 g and 0.35 g of alkanolamide were successively dissolved in 993.0 ...

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Abstract

The invention provides a foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2. The foaming agent is composed of the following components in percentage by weight: 0.12%-0.30% of anionic surfactant, 0.06%-0.15% of imidazoline-derived ampholytic surfactant, 0.12%-0.30% of lycine-derived ampholytic surfactant, 0.02%-0.04% of foam stabilizer and the balance of water. The foaming agent for plugging gas channeling in displacement of reservoir oil by using CO2 is characterized in that the anionic surfactant, the imidazoline-derived ampholytic surfactant, the lycine-derived ampholytic surfactant and the foam stabilizer are combined so that the obtained foaming agent is capable of forming stable foam with the CO2, and thus is strong in foaming capacity and high in stability; the foaming agent has high plugging selectivity and can be used for plugging CO2 channeling in the displacement of reservoir oil by using CO2, and therefore, the plugging effects of plugging water rather than oil and plugging large rather than small can be achieved, and the oil recovery factor and the effect of the displacement of reservoir oil by using CO2 can be improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, in particular to a 2 Foaming agent for blocking gas channeling in oil flooding. Background technique [0002] Low permeability reservoirs use CO 2 Oil flooding can enhance oil recovery, and its effect is much better than that of water and N 2 , air (main medium N 2 ), CH 4 There are two main reasons for such gas drive media: one is CO 2 The injection resistance is small, and the injection-production pressure difference is smaller than that of water flooding; the second is that CO 2 It is easier to miscible than other gas flooding media, which can effectively improve the oil displacement effect. CO 2 Under formation conditions, it is in a supercritical state, its viscosity is similar to that of gas, and its seepage resistance is small; and low-permeability reservoirs often have well-developed fractures, and gas channeling is very easy to occur. To prevent CO 2 The fracture chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/594C09K8/584
CPCC09K8/584C09K8/594
Inventor 李克智罗懿张永刚秦玉英魏开鹏熊佩徐斌杨欢刘岳龙卢瑜林
Owner CHINA PETROLEUM & CHEM CORP
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