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Nano emulsion injection stimulation agent for oil field water injection, preparation method thereof and oil field water injection system

A technology of nanoemulsion and oilfield water injection, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as limited contact area and poor formation wetting ability, achieve good mixing performance, reduce water injection pressure, and reduce thickness Effect

Inactive Publication Date: 2016-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a nano-emulsion injection booster for oilfield water injection, thereby solving the technical problems of the prior art that the contact area between the depressurization booster injection agent and the rock crevice hydration layer is limited, and the poor formation wettability is improved; Realize the effective stripping of the oil film on the pores, increase the effective water injection channel, thereby improving the seepage environment, increasing the water phase permeability, reducing the water injection pressure, and achieving the purpose of increasing injection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The nanoemulsion injection booster for oil field water injection of the present embodiment is composed of the following components in mass percentage: 4.3% of non-polar oil phase, 34.7% of nonionic surfactant, 22% of zwitterionic surfactant, and anionic surfactant 22%, the balance being water.

[0025] The non-polar oil phase is a long-chain alcohol, and the long-chain alcohol is n-octanol; the nonionic surfactant is fatty alcohol polyoxyethylene ether AEO20, corresponding to RO(CH 2 CH 2 O) x In the general structural formula of H, R is an alkyl group with 12 carbon atoms, and x is 20); the zwitterionic surfactant is cocamidopropyl betaine; the anionic surfactant is petroleum sulfonate .

[0026] The preparation method of the nanoemulsion injection booster for oilfield water injection of the present embodiment comprises: weighing 8.00g fatty alcohol polyoxyethylene ether AEO20, 4.00g petroleum sulfonate, 5.00g cocamidopropyl betaine and 5.50g water In a beaker, sti...

Embodiment 2

[0029] The nanoemulsion injection booster for oilfield water injection in this embodiment is composed of the following components by mass percentage: 4% non-polar oil phase, 35.3% nonionic surfactant, 13.2% zwitterionic surfactant, and anionic surfactant 7%, the balance is water.

[0030] The non-polar oil phase is a long-chain alcohol, and the long-chain alcohol is n-hexanol; the nonionic surfactant is fatty alcohol polyoxyethylene ether AEO9, corresponding to RO(CH 2 CH 2 O) in the general structural formula of xH, R is an alkyl group with 10 carbon atoms, and x is 9); the zwitterionic surfactant is lauryl amidopropyl betaine; the anionic surfactant is dodecane Sodium phenyl sulfonate.

[0031]The preparation method of the nanoemulsion injection booster for oilfield water injection of the present embodiment comprises: weighing 12.00g fatty alcohol polyoxyethylene ether AEO9, 2.50g sodium dodecylbenzenesulfonate, 4.50g lauryl amidopropyl betaine and Put 13.50g of water in ...

Embodiment 3

[0034] The composition of the nanoemulsion injection booster for oilfield water injection in this example is basically the same as that in Example 1, except that the non-polar oil phase is n-stearyl alcohol.

[0035] The preparation method of the nanoemulsion injection booster for oilfield water injection in this embodiment is the same as that in Embodiment 1. 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 89.61 nm.

[0036] The oilfield water injection system of this embodiment is prepared by adding water to the nanoemulsion injection enhancer of this embodiment, with a mass concentration of 0.1%; the preparation water is the on-site injection water of Honghe Oilfield.

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Abstract

The invention discloses a nano emulsion injection stimulation agent for oil field water injection, a preparation method thereof and an oil field water injection system. The nano emulsion injection stimulation agent is prepared from, by mass, 0.01-5% of a non-polar oil phase, 25-45% of a non-ionic surfactant, 5-25% of a zwitterionic surfactant, 1-20% of an anionic surfactant and the balance water. The injection stimulation agent can achieve full adsorption on the surface of a clint micro channel, and therefore the wettability of the surface of rock can be effectively changed, the wall face boundary layer thickness is substantially reduced, an effective flowing channel is enlarged, flowing resistance is substantially reduced, and the purposes of reducing pressure and stimulating injection are achieved. The invention further provides the preparation method of the nano emulsion injection stimulation agent and the proper adding quantity of the injection stimulation agent when the injection stimulation agent serves as the oil field water injection system.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a nano-emulsion injection booster for oilfield water injection and a preparation method thereof, and also relates to an oilfield water injection system containing the above-mentioned nano-emulsion injection booster. Background technique [0002] Low-permeability reservoirs are an important part of my country's petroleum resources. Most low-permeability reservoirs are mainly developed by water injection. Low-permeability reservoirs generally have the characteristics of small pore throats, low permeability, and large seepage resistance. The initial water injection pressure of some water injection wells is not high, but as the water injection time continues, the water injection pressure rises rapidly, the water injection volume drops rapidly, and even the phenomenon of no water injection occurs, resulting in a rapid decline in oil production. [0003] The reas...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 罗懿李克智唐万举魏开鹏邓学峰张永刚方群梅洁杨欢王萍符伟兵斯容王薇熊佩刘学全隋冬梅
Owner CHINA PETROLEUM & CHEM CORP
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