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Preparation method of profile control and oil displacement system of polyacrylamide nanometer microsphere with low interfacial tension

A technology of polyacrylamide and interfacial tension, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that Span series surfactants cannot improve the oil washing efficiency, the oil-water interfacial tension remains high, and the oil-water interface Improve oil recovery, reduce oil-water interfacial tension, and low interfacial tension

Inactive Publication Date: 2010-06-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lipophilicity of the Span series of surfactants will make the oil-water interface activity worse, and the oil-water interfacial tension remains high. When the polyacrylamide nano-microsphere system is formulated into an aqueous solution and injected into the oil layer, the Span series of surfactants cannot improve the oil-water interfacial tension. The role of oil washing efficiency, resulting in huge waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First take by weighing 49.00g white oil and the emulsifier compounded by 8.50g lauric acid (LA), 5.10g Span80 and 3.40g Tween80 and mix with electromagnetic stirrer, then will be made of 13.50g deionized water (H 2 O), 18.56g acrylamide (AM), 2.28g 2-acrylamido-2 methyl propane sulfonate sodium (NaAMPS), 0.01g cross-linking agent polyethylene glycol diacrylate (PEGDA) and 0.03g oxidizing agent Add an aqueous solution of ammonium sulfate (APS) into it, stir evenly until the whole system is transparent or translucent, then transfer it into a four-necked flask with a stirring bar that has been placed in a constant temperature water bath at 30°C, and pass through N 2 Deoxygenation was carried out for 10 minutes, and then 0.20 g of an aqueous solution of sodium sulfite (SS) with a mass concentration of 10% was added while stirring to initiate polymerization. After the exothermic peak of the reaction, continue the reaction for tens of minutes to obtain a transparent or transl...

Embodiment 2

[0022] Embodiment 2: first take by weighing 84.00g diesel oil and the emulsifier compounded by 14.76g oleic acid (OA), 11.16g Span20 and 10.08gOP10 and mix with electromagnetic stirrer, then will be made of 43.87g deionized water (H 2 O), 36.00g acrylamide (AM), 0.01g methylenebisacrylamide (MBA), 0.04g crosslinking agent polyethylene glycol diacrylate (PEGDA) and 0.08g oxidant ammonium persulfate (APS) Add the aqueous solution into it, stir until the whole system is uniformly mixed and becomes transparent or translucent, then transfer it into a four-necked flask with a stirring bar that has been placed in a constant temperature water bath at 40°C, and pass through N 2Deoxygenation was carried out for 10 minutes, and then 0.30 g of an aqueous solution of formaldehyde sulfoxylate (FS) with a mass concentration of 10% was added while stirring to initiate free radical polymerization of acrylamide. After the exothermic peak of the reaction has passed, the reaction is continued for...

Embodiment 3

[0027] Embodiment 3: first take by weighing 24.00g kerosene, 72.00g diesel oil, 10.24g dodecylbenzenesulfonic acid (DBSA, purity 90%), 12.80g Span80 and 8.96g Tween60 mix with electromagnetic stirrer, then will be made of 29.90g Deionized water, 31.50g acrylamide (AM), 10.50g methacryloyloxyethyltrimethylammonium chloride (DMC), 0.04g crosslinking agent polyethylene glycol diacrylate (PEGDA) and 0.06g oxidizing agent Add an aqueous solution of potassium persulfate (KPS) into it, stir until the whole system is uniformly mixed and becomes transparent or translucent, then transfer it into a four-necked flask with a stirring bar that has been placed in a constant temperature water bath at 30°C. N 2 Oxygen was removed for 10 minutes, and then 0.40 g of a 10% sodium bisulfite (SHS) aqueous solution was added while stirring to initiate the polymerization reaction of acrylamide and methacryloyloxyethyltrimethylammonium chloride. After the exothermic peak of the reaction has passed, t...

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Abstract

The invention relates to a preparation method of a profile control and oil displacement system of polyacrylamide nanometer microsphere with low interfacial tension, which comprises the steps of: inversely preparing microemulsion with oil phase, combined emulsifying agents and water phase containing crosslinking agents, initiating polyreaction with a redox initiation system used as initiating agents, neutralizing the obtained polyacrylamide nanometer microsphere with alkali, and preparing highly active sulphonate or carboxylate surfactants with the reaction of the alkali and the substance of organic acid in the combined emulsifying agents; the oil water interfacial tension can be greatly reduced by the surfactants. The profile control and oil displacement system is applied to enhancing enhanced recovery ratio, has good effect on enhancing oil cleaning efficiency, and is a novel profile control and oil displacement system with the dual functions of profile control and oil displacement.

Description

Technical field: [0001] The invention relates to a preparation method of a polyacrylamide nanometer microsphere regulating and flooding system. Background technique: [0002] At present, most of the oilfields are in the stage of high water-cut exploitation of water flooding development, the heterogeneity of the reservoir is serious, the water flow advantage channel is well developed, the injected water is ineffective circulation, and the oil layer sweep coefficient is low, resulting in the low oil recovery and the late stage. Reservoir flooding, equipment corrosion, excessive sewage treatment load and other problems. In addition, with the increasing consumption of crude oil and high international oil prices, many offshore oil fields, low-permeability, high-salinity reservoirs and other harsh conditions began to be developed, while most of the existing profile control and water shutoff Agents and related supporting technologies are not suitable for such reservoirs. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F2/32C09K8/588
Inventor 葛际江王磊张贵才赵楠蒋平孙铭勤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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