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Microsphere oil displacement agent used for improving recovery efficiency

A technology of recovery factor and oil displacement agent, applied in the field of microsphere oil displacement agent, can solve the problems of inhomogeneity, small sweep coefficient of injected fluid, low recovery factor, etc. Resistance to salinity, the effect of increasing crude oil production

Inactive Publication Date: 2015-10-14
东营市惠好科技开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For my country's oilfields, there are many development layers, and the inter-layer and intra-layer heterogeneity are serious. After entering the high water-cut and ultra-high water-cut period, the injection fluid has a small sweep coefficient and a low recovery factor.

Method used

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  • Microsphere oil displacement agent used for improving recovery efficiency
  • Microsphere oil displacement agent used for improving recovery efficiency
  • Microsphere oil displacement agent used for improving recovery efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The microsphere oil displacement agent for enhanced oil recovery comprises the following raw materials in parts by weight:

[0025] 100 grams of deionized water Acrylamide crystals 13.3 grams

[0026] Styrene 2.3 grams Cross-linking agent 0.3 grams

[0027] Ammonium persulfate 0.7g Potassium persulfate 0.2g

[0028] Oil 160g Span-80 6.4g

[0029] Tween-80 1.6 g.

[0030] The oil is mineral oil, white oil or vegetable oil.

[0031] The cross-linking agent is N, N / - Methylenebisacrylamide.

[0032] The preparation method of microsphere oil displacement agent for enhancing oil recovery comprises the following steps:

[0033] 1) Prepare the oil phase:

[0034] Add oil into a small kettle, start stirring, then put Span-80 and Tween-80 into the reaction kettle, stir, heat the materials in the reaction kettle, and keep the temperature constant for half an hour;

[0035] 2) Prepare the water phase:

[0036] Add acrylamide crystals, crosslinking agent and ammonium per...

Embodiment 2

[0045] The microsphere oil displacement agent for enhanced oil recovery comprises the following raw materials in parts by weight:

[0046] 50 grams of deionized water Acrylamide crystals 8 grams

[0047] Styrene 1 g Crosslinker 0.1 g

[0048] Ammonium persulfate 0.1g Potassium persulfate 0.1g

[0049] Oil 100g Span-80 1g

[0050] Tween-80 0.5 g.

[0051] The oil is mineral oil, white oil or vegetable oil.

[0052] The cross-linking agent is N, N / - Methylenebisacrylamide.

[0053] The preparation method of microsphere oil displacement agent for enhancing oil recovery comprises the following steps:

[0054] 1) Prepare the oil phase:

[0055] Add oil into a small kettle, start stirring, then put Span-80 and Tween-80 into the reaction kettle, stir, heat the materials in the reaction kettle, and keep the temperature constant for half an hour;

[0056] 2) Prepare the water phase:

[0057] Add acrylamide crystals, crosslinking agent and ammonium persulfate to the prepared ...

Embodiment 3

[0064] The microsphere oil displacement agent for enhanced oil recovery comprises the following raw materials in parts by weight:

[0065] 200g deionized water 15g acrylamide crystals

[0066] Styrene 5 g Cross-linking agent 0.9 g

[0067] Ammonium persulfate 2g Potassium persulfate 0.5g

[0068]Oil 260g Span-80 5g

[0069] Tween-80 2 g.

[0070] The oil is mineral oil, white oil or vegetable oil.

[0071] The cross-linking agent is N, N / - Methylenebisacrylamide.

[0072] The preparation method of microsphere oil displacement agent for enhancing oil recovery comprises the following steps:

[0073] 1) Prepare the oil phase:

[0074] Add oil into a small kettle, start stirring, then put Span-80 and Tween-80 into the reaction kettle, stir, heat the materials in the reaction kettle, and keep the temperature constant for half an hour;

[0075] 2) Prepare the water phase:

[0076] Add acrylamide crystals, crosslinking agent and ammonium persulfate to the prepared deionize...

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Abstract

The invention discloses a microsphere oil displacement agent used for improving recovery efficiency. According to the invention, the participations of an acrylamide crystal, N,N'-methylene bisacrylamide, styrene and potassium persulfate enable gel ductility of polymer gel microspheres to reach the maximum; meanwhile, good characteristics of temperature resistance and mineralization resistance and enormous quantitative characteristic are obtained, and online injection can be realized; pore-scale polymer microspheres can be migrated in the core and has high a resistance coefficient and a residual resistance coefficient; the resistance coefficient of a compound system of microspheres and a polymer solution in the core is much higher than the resistance coefficient of a pure polymer solution system in the core, and synergistic effects and higher abilities of increasing the swept volume and preventing the polymer solution from flowing in a highly-penetrable pore channel are obtained; and the pore-scale polymer microspheres have good adaptability to nonhomogeneity of an oil layer, so that the injection water swept volume can be significantly expanded; water content of an oil well is reduced; and crude oil output is increased.

Description

technical field [0001] The invention relates to the technical field of oil-displacing agents for oil fields, in particular to microsphere oil-displacing agents for enhancing oil recovery. Background technique [0002] Oilfield recovery is affected by the swept volume of injected fluid and oil washout efficiency. For my country's oilfields, there are many development layers, and the interlayer and intralayer heterogeneity are serious. After entering the high water-cut and ultra-high water-cut period, the injection fluid has a small sweep coefficient and a low recovery factor. Changing the flow direction of injected water and increasing the swept volume of injected water are important methods to enhance oil recovery. Contents of the invention [0003] The purpose of the present invention is to address the defects of the existing technology, to provide a method that can change the flow direction of the injected water, increase the swept volume of the injected water, match th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F220/56C08F212/08C08F222/38
CPCC09K8/588C08F220/56
Inventor 李林
Owner 东营市惠好科技开发有限责任公司
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