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Viscous self-emulsifying system as well as preparation method and application thereof

A self-emulsifying, systemic technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problems of high resistance to chemical agents, low permeability, and no popularization and application, so as to achieve unobtrusive selectivity, Emulsification speed is fast and the effect of improving oil washing efficiency

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used methods include water flooding heavy oil and then turning to thermal recovery to enhance recovery. In this way, the permeability of the formation is generally 0.076μm 2 to 36μm 2 When it is within the range, the permeability has little effect on the residual oil saturation after steam breakthrough. In high permeability formations, the permeability is directly related to the residual oil saturation. This technology has received certain acceptance in practical applications. limits
The other is water flooding of heavy oil followed by chemical flooding to enhance oil recovery. Due to the impact of high temperature, high salt and low permeability, this technology has high requirements for the tolerance of chemical agents, and it has not been widely used at present.

Method used

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  • Viscous self-emulsifying system as well as preparation method and application thereof
  • Viscous self-emulsifying system as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Viscous self-emulsifying system comprising betaine-type surfactants and builders in which:

[0052] The mass ratio of betaine surfactant and auxiliary agent is 1:0.08;

[0053] The structural formula of the auxiliary agent is as follows:

[0054] n=3.

[0055] Further, the betaine-type surfactant is lauryl amidopropyl hydroxysultaine.

[0056] The preparation method of viscous self-emulsifying system comprises the following steps:

[0057] (1) Get the betaine type surfactant of formula quantity, be warming up to 40 ℃, stir 30 minutes;

[0058] (2) Add the formulated amount of additives to the betaine-type surfactant treated in step (1), stir evenly, and cool down to room temperature to obtain a viscous self-emulsifying system.

[0059] The viscous self-emulsifying system obtained in Example 1 was tested: the aqueous solution of the viscous self-emulsifying system with a concentration of 0.3% had a viscosity of 15mPa.s at 60°C, which was much higher than the viscos...

Embodiment 2

[0085] Viscous self-emulsifying system comprising betaine-type surfactants and builders in which:

[0086] The mass ratio of betaine surfactant and auxiliary agent is 1:0.8;

[0087] The structural formula of the auxiliary agent is as follows:

[0088] n=6.

[0089] Further, the betaine-type surfactant is cocamidopropyl betaine.

[0090] The preparation method of viscous self-emulsifying system comprises the following steps:

[0091] (1) Get the betaine type surfactant of formula quantity, be warming up to 50 ℃, stir 20 minutes;

[0092] (2) Add the formulated amount of additives to the betaine-type surfactant treated in step (1), stir evenly, and cool down to room temperature to obtain a viscous self-emulsifying system.

[0093] Test the viscous self-emulsifying system obtained in Example 2: the viscosity of the aqueous solution of the viscous self-emulsifying system with a concentration of 0.3% is 14.5mPa.s at 60°C, which is much higher than the viscosity reducer for h...

Embodiment 3

[0119] Viscous self-emulsifying system comprising betaine-type surfactants and builders in which:

[0120] The mass ratio of betaine surfactant and auxiliary agent is 1:0:01;

[0121] The structural formula of the auxiliary agent is as follows:

[0122] n=1.

[0123] Further, the betaine-type surfactant is lauryl betaine.

[0124] The preparation method of viscous self-emulsifying system comprises the following steps:

[0125] (1) Get the betaine type surfactant of formula quantity, be warming up to 30 ℃, stir 60 minutes;

[0126] (2) Add the formulated amount of additives to the betaine-type surfactant treated in step (1), stir evenly, and cool down to room temperature to obtain a viscous self-emulsifying system.

[0127] Test the viscous self-emulsifying system obtained in Example 3: the viscosity of the aqueous solution of the viscous self-emulsifying system with a concentration of 0.3% is 15.6mPa.s at 60°C, which is much higher than the viscosity reducer for heavy oi...

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Abstract

The invention discloses a viscous self-emulsifying system which comprises a betaine type surfactant and an auxiliary agent, and the mass ratio of the betaine type surfactant to the auxiliary agent is 1: (0: (01-0.8)). The invention also discloses a preparation method of the viscous self-emulsifying system, which comprises the following steps: (1) taking the betaine type surfactant according to the formula ratio, heating and stirring; and (2) adding the auxiliary agent according to the formula ratio, uniformly stirring, and cooling to room temperature to obtain the viscous self-emulsifying system. The viscous self-emulsifying system is used as a viscous oil field viscosity reducer. The invention has the following beneficial effects: 1, the preparation method is simple; 2, the viscous self-emulsifying system is good in dissolving property, high in thick oil emulsifying speed and not prominent in oil selectivity; and 3, the aqueous solution of the viscous self-emulsifying system has viscosity and activity, and can reduce the viscosity of crude oil, improve the oil washing efficiency and improve the recovery efficiency of a heavy oil field while changing the microscopic balance of oil and water in a stratum, emulsifying the crude oil and stripping the crude oil.

Description

technical field [0001] The invention belongs to the field of oilfield development, in particular to a viscous self-emulsifying system and its preparation method and application. Background technique [0002] With the rapid development of China's economy, domestic energy consumption is increasing day by day, and the demand for oil is increasing year by year. [0003] Heavy oil resources occupy an important position in the global crude oil reserves, and countries have gradually paid more attention to the development of heavy oil resources. China is very rich in heavy oil resources, and the amount of heavy oil resources can reach 300×10 8 t, and widely distributed, more than 70 heavy oil fields have been discovered in 12 basins. my country's offshore oil and gas resources are mainly located in China's Bohai Sea, East China Sea and South China Sea. The vast majority of offshore oil and gas resources are heavy oil resources, which are difficult to develop. [0004] Heavy oil r...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 刘希明胡秋平史树彬宋清新王昊付琛张小卫朱妍婷刘军韦雪
Owner CHINA PETROLEUM & CHEM CORP
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