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Foam oil displacement system with ultralow interfacial tension and use method of foam oil displacement system

A technology of interfacial tension and foam flooding, which is applied in the fields of chemical instruments and methods, production fluids, earth drilling and production, etc., and can solve problems such as the formula of foam flooding system with no comprehensive performance

Active Publication Date: 2015-12-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is no foam flooding system formulation with excellent comprehensive performance

Method used

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  • Foam oil displacement system with ultralow interfacial tension and use method of foam oil displacement system
  • Foam oil displacement system with ultralow interfacial tension and use method of foam oil displacement system
  • Foam oil displacement system with ultralow interfacial tension and use method of foam oil displacement system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The ultra-low interfacial tension foam flooding system of the present invention is formed by mixing the raw materials in the following weight percentages:

[0086] Lauryl dimethyl betaine (amphoteric type) 0.1% Sodium hydroxide 0.15%

[0087] Acrylamide copolymer 0.01% water balance.

[0088] Get ultra-low interfacial tension foam flooding system and carbon dioxide, according to ultra-low interfacial tension foam flooding system: carbon dioxide=1:2 volume ratio is injected into formation simultaneously; The volume of described carbon dioxide gas is calculated according to formation pressure; The total volume of the low interfacial tension foam flooding system and carbon dioxide gas is 5% of the total pore volume of the reservoir.

Embodiment 2

[0090] The ultra-low interfacial tension foam flooding system of the present invention is formed by mixing the raw materials in the following weight percentages:

[0091] Lauryl dimethyl betaine (amphoteric type) 0.3% Sodium hydroxide 0.05%

[0092] Acrylamide copolymer 0.10% water balance.

[0093] Get ultra-low interfacial tension foam flooding system and carbon dioxide, according to ultra-low interfacial tension foam flooding system: carbon dioxide=2:1 volume ratio is injected into formation simultaneously; The volume of described carbon dioxide gas is calculated according to formation pressure; The total volume of the low interfacial tension foam flooding system and carbon dioxide gas is 50% of the total pore volume of the oil reservoir.

Embodiment 3

[0095] The ultra-low interfacial tension foam flooding system of the present invention is formed by mixing the raw materials in the following weight percentages:

[0096] Lauryl dimethyl betaine (amphoteric type) 0.3% Sodium hydroxide 0.05%

[0097] Acrylamide copolymer 0.10% water balance.

[0098] Get the ultra-low interfacial tension foam flooding system and carbon dioxide, and inject them into the formation simultaneously according to the ultra-low interfacial tension foam flooding system: carbon dioxide=1.4:1.6 volume ratio; the volume of the carbon dioxide gas is calculated according to the formation pressure; The total volume of the low interfacial tension foam flooding system and carbon dioxide gas is 30% of the total pore volume of the reservoir.

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Abstract

The invention provides a foam oil displacement system with ultralow interfacial tension and a use method of the foam oil displacement system. The oil displacement system is formed by mixing raw materials in percentage by weight as follows: 0.1%-0.3% of a foaming agent, 0.05%-0.15% of an inorganic reagent, 0.01%-0.10% of a foam stabilizer and the balance of water, wherein the foaming agent is dodecyl dimethyl betaine, dodecyl hydroxysulfobetaine, dodecyl hydroxypropyl sulphobetaine, lauramide propyl hydroxysulfobetaine, lauramide propyl betaine, cocamidopropyl dimethylamine oxide, gemini oxidized tertamine, polyoxyethylene dodecanol ether sulfate or sodium dodecyl sulfate; the inorganic reagent is sodium hydroxide, anhydrous sodium carbonate or sodium metaborate; the foam stabilizer is partially HPAM (hydrolyzed polyacrylamide), acrylamide copolymer, PACHV (high-viscosity polyanionic cellulose) or HPMC (hydroxypropyl methyl cellulose).

Description

technical field [0001] The invention belongs to oil field tertiary oil recovery technology, and in particular relates to an ultra-low interfacial tension foam flooding system and its application method. Background technique [0002] After long-term water flooding in reservoirs, high-permeability water channeling channels are likely to form in the strata, and the injected water is likely to rush in one direction along the direction of large pores, resulting in channeling. Depth profile control must be carried out to expand the swept volume, so that the injected water can enter the middle and low permeability layers, and at the same time improve the oil washing efficiency. Due to its high apparent viscosity and selective plugging characteristics of "blocking large pores but not small pores, water blocking but not oil", foam can adjust the water absorption profile and increase the swept volume of water flooding. In addition, the excellent foam system can greatly reduce the oil...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/584E21B43/22
CPCC09K8/584C09K8/594
Inventor 杜勇田波滕学伟钱钦贾耀勤侯洪涛宾永锋
Owner CHINA PETROLEUM & CHEM CORP
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