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Gemini surfactant nano-emulsion injection booster for oil field water injection and preparation method thereof

A Gemini surface and nanoemulsion technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low success rate, short validity period, small acid penetration distance, etc., and achieve good injection performance, water phase The effect of improved permeability and simple preparation method

Active Publication Date: 2019-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, many chemical stimulation injection technologies are used in China, including earth acid, compound acid acidification, acidification-oxidation compound, thermochemical stimulation injection, etc. The rock reaction speed is fast, the acid penetration distance is small, the validity period after acidification is short, or due to factors such as acid rock reaction and acid liquid incompatibility, new sedimentation blockages are formed, resulting in low success rate or even ineffectiveness

Method used

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  • Gemini surfactant nano-emulsion injection booster for oil field water injection and preparation method thereof
  • Gemini surfactant nano-emulsion injection booster for oil field water injection and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 10.00g polyethoxylated fatty alcohol (structure is R-(O-C-C) x -OH, where R is a straight-chain alkyl group with 10 carbons, and x is 4), 10.00g of gemini surfactant and 18.00g of water were placed in a beaker, stirred on a magnetic stirrer at 200rpm for 30 min to make the system evenly stirred, At this point, slowly add 2.00 g of n-butanol dropwise to the beaker. After the dropwise addition is complete, keep the stirring speed of the magnetic stirrer at 200 rpm and stir for 30 minutes to obtain a clear and transparent nanoemulsion. The droplet size of the nanoemulsion was measured by ZetaPlus from Brookhaven Instrument Company, USA, and the average particle size of the prepared nanoemulsion was 28.62nm.

Embodiment 2

[0019] Weigh 4.00g polyethoxylated fatty alcohol (structure is R-(O-C-C) x -OH, where R is a straight-chain alkyl group with 10 carbons, and x is 9), 15.00g of gemini surfactant and 17.00g of water are placed in a beaker, and stirred on a magnetic stirrer at 200rpm for 30min to make the system evenly stirred. Slowly add 4.00g n-butanol dropwise to the beaker, after the dropwise addition is complete, keep the stirring speed of the magnetic stirrer at 200rpm, and stir for 30min to obtain a clear and transparent nanoemulsion. The droplet size of the nanoemulsion was measured by ZetaPlus from Brookhaven Instrument Company, USA, and the average particle size of the prepared nanoemulsion was 43.50 nm.

Embodiment 3

[0021] Weigh 12.00g polyethoxylated fatty alcohol (structure is R-(O-C-C) x -OH, wherein R is a straight-chain alkyl group with 10 carbons, and x is 8), 5.00g of gemini surfactant and 20.00g of water in a beaker, stirred on a magnetic stirrer at 200rpm for 30 min to make the system evenly stirred, At this point, slowly add 3.00 g of n-butanol dropwise to the beaker. After the dropwise addition is complete, keep the stirring speed of the magnetic stirrer at 200 rpm and stir for 40 minutes to obtain a clear and transparent nanoemulsion. The droplet size of the nanoemulsion was measured by ZetaPlus from Brookhaven Instrument Company, USA, and the average particle size of the prepared nanoemulsion was 37.82nm.

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Abstract

The invention discloses a gemini surfactant nano-emulsion injection increase agent for oilfield water injection and a preparation method thereof. The gemini surfactant nano-emulsion injection increase agent is characterized by comprising, by mass percentage, 0.01-10% of nonpolar dispersion phase, 5-40% of gemini surfactant, 3-35% of non-ionic surfactant, and the balance water. The method for preparing a nano-emulsion comprises the steps of first evenly stirring water and surfactant at a stirring speed of 100-500 rpm through a magnetic stirrer at 5-40 DEG C, adding the nonpolar dispersion phase into a system dropwise, maintaining a stirring speed of 100-500 rpm to perform stirring for 5-60 min, and obtaining the nano-emulsion transparent in appearance. Indoor rock core displacement test results indicate that 0.1-0.2% of nano-emulsion can improve the aqueous phase permeability of a rock core by 10% or above.

Description

technical field [0001] The invention relates to a gemini surfactant nano-emulsion injection booster for oilfield water injection and a preparation method thereof. Background technique [0002] In the process of oilfield water injection development, high water injection pressure has become an important factor restricting the water injection development of low permeability oilfields. Only by doing a good job in reducing pressure and increasing injection and controlling water injection pressure can the development of low permeability oilfields proceed normally. [0003] At present, many chemical stimulation injection technologies are used in China, including earth acid, compound acid acidification, acidification-oxidation compound, thermochemical stimulation injection, etc. The rock reaction speed is fast, the acid penetration distance is small, the validity period after acidification is short, or due to factors such as acid rock reaction and acid liquid incompatibility, new se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/584
CPCC09K8/52C09K8/584
Inventor 王康袁俊秀封心领徐冬梅靳志超
Owner CHINA PETROLEUM & CHEM CORP
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