High-temperature-resistant and high-salt-resistant active agent capable of reducing ultra-low permeability oil reservoir starting pressure gradient

A start-up pressure gradient and ultra-low permeability technology, applied in the field of oil and gas fields, can solve the problems of difficult water injection and high start-up pressure gradient, and achieve good salt tolerance, lower start-up pressure gradient, and good temperature resistance

Active Publication Date: 2018-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned prior art, in order to overcome the problems of high start-up pressure gradient and difficult water injection in high-temperature, high-salt and ultra-low

Method used

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  • High-temperature-resistant and high-salt-resistant active agent capable of reducing ultra-low permeability oil reservoir starting pressure gradient
  • High-temperature-resistant and high-salt-resistant active agent capable of reducing ultra-low permeability oil reservoir starting pressure gradient
  • High-temperature-resistant and high-salt-resistant active agent capable of reducing ultra-low permeability oil reservoir starting pressure gradient

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1 Preparation of a high-temperature-resistant high-salt active agent that can reduce the start-up pressure gradient of ultra-low permeability reservoirs

[0033] The components are: dihexadecyl triquaternary ammonium salt surfactant BDT-16: 22.5%; nonylphenol polyoxyethylene ether phosphate surfactant HSD: 20%; compound organic alcohol YCH: 2.2%; organic anti-swelling agent Agent FPJ: 3.8%; the balance is water. The composite organic alcohol YCH is composed of myristyl alcohol and cetyl alcohol, and the molar ratio of the two is 1:2.

[0034]The preparation method is as follows: add part of water (50% water in the total amount of water) to the reaction kettle, then add dihexadecyl triquaternary ammonium salt surfactant BDT-16, nonylphenol polyoxyethylene ether phosphate surfactant agent HSD, compound organic alcohol YCH and organic anti-swelling agent FPJ, and finally add the remaining water, stir evenly, and it is ready.

[0035] Wherein, the preparation meth...

Embodiment 2

[0045] Example 2 Preparation of a high-temperature-resistant high-salt active agent that can reduce the start-up pressure gradient of ultra-low permeability reservoirs

[0046] The components are: BDT-16: 23% dihexadecyl triquaternary ammonium salt surfactant; HSD: 19% nonylphenol polyoxyethylene ether phosphate surfactant; 2.3% compound organic alcohol YCH; organic anti-swelling agent Agent FPJ: 3.7%; the balance is water.

[0047] Others are with embodiment 1.

Embodiment 3

[0048] Example 3 Preparation of a high-temperature-resistant high-salt active agent that can reduce the start-up pressure gradient of ultra-low permeability reservoirs

[0049] The components are: BDT-16: 22% dihexadecyl triquaternary ammonium salt surfactant; HSD: 21% nonylphenol polyoxyethylene ether phosphate surfactant; 2.1% compound organic alcohol YCH; organic anti-swelling Agent FPJ: 3.9%; the balance is water.

[0050] Others are with embodiment 1.

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Abstract

The invention discloses a high-temperature-resistant and high-salt-resistant active agent capable of reducing ultra-low permeability oil reservoir starting pressure gradient, wherein the high-temperature-resistant and high-salt-resistant active agent comprises, by weight, 22-23% of a dihexadecyl triquaternary ammonium salt surfactant BDT-16, 19-21% of a nonylphenol polyoxyethylene ether phosphatesurfactant HSD, 2.1-2.3% of composite organic alcohol YCH, 3.7-3.9% of an organic anti-swelling agent FPJ, and the balance of water. According to the present invention, based on the high temperature and high salt ultra-low permeability oil reservoir, the active system for reducing the starting pressure gradient is researched and developed, has good temperature resistance, can resist the temperature of 130 DEG C, has good salt resistance, can resist salt of 200 g/L, can greatly reduce the oil-water interfacial tension, can significantly reduce the starting pressure gradient of the fluid in theultra-low permeability oil core, and can be used for the water injection development of the high temperature and high salt ultra-low permeability oil reservoir, wherein the minimum starting pressure and the quasi-starting pressure gradient can be reduced by more than 20%.

Description

technical field [0001] The invention relates to a high-temperature-resistant high-salt active agent capable of reducing the starting pressure gradient of ultra-low permeability reservoirs, which can significantly reduce the starting pressure gradient of ultra-low permeability formations during the water injection development process of ultra-low permeability reservoirs, and belongs to the technical field of oil and gas fields. Background technique [0002] Ultra-low permeability reservoirs are dominated by fine-to-fine throats, with poor connectivity and large specific surface area. The seepage mechanism and oil-water movement laws are quite different from those of medium-high permeability reservoirs, and their seepage laws do not follow Darcy's law. Due to the interfacial tension between the solid-liquid interface, an adsorption and retention layer of fluid, that is, the boundary layer, will be formed on the surface of the fine pores. Only when the displacement pressure dif...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/58C09K8/584C09K2208/12
Inventor 赵琳刘希明张星李强陈利霞成梅华张磊卢占国
Owner CHINA PETROLEUM & CHEM CORP
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