Oil-displacing agent composition, oil-displacing agent and preparation method and application thereof

A technology of oil displacement agent and composition, which is applied in the field of oil recovery, can solve the problems of reservoir permeability decrease, reservoir environmental pollution, etc., and achieve the effects of less reservoir pollution, increased recovery, and reduced oil-water interfacial tension

Inactive Publication Date: 2021-03-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still serious problems with the above EOR technology
Due to the adsorption and retention of surfactants in porous media, the smaller pore throats are blocked, resulting in a decrease in reservoir permeability and pollution to the reservoir environment

Method used

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  • Oil-displacing agent composition, oil-displacing agent and preparation method and application thereof
  • Oil-displacing agent composition, oil-displacing agent and preparation method and application thereof
  • Oil-displacing agent composition, oil-displacing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a series of oil displacement agents and preparation methods thereof, the specific preparation process is as follows:

[0040] Dissolve dodecyl dihydroxyethyl amine oxide in deionized water to obtain solution I; dissolve alkyl glycoside APG1214 in water to obtain solution II; The compound mass ratio is 0:10-10:0 for mixing, using a magnetic stirrer to stir for 30 minutes, and is prepared into a 0.5wt% aqueous solution (ie: the total mass of alkyl glycoside APG1214 and dodecyl dihydroxyethyl amine oxide Accounting for the mass concentration of the total oil-displacing agent is 0.5wt%), a series of oil-displacing agents are obtained.

[0041] The crude oil emulsification test is carried out to the oil displacement agent prepared in this embodiment, and the steps are as follows:

[0042] The oil phase is mixed with degassed and dehydrated crude oil from an oilfield and kerosene at a ratio of 1:1, and the water phase is the oil displacement agent pr...

Embodiment 2

[0046] Embodiment 2: Characterization of structural change of oil displacement agent

[0047] The oil-displacing agent prepared in Example 1 of the present invention, wherein, in the oil-displacing agent, the compounding mass ratio of alkyl glycoside APG1214 to dodecyl dihydroxyethyl amine oxide is 7:3, and alkyl glycoside APG1214 and The total mass of dodecyl dihydroxyethyl amine oxide accounts for 0.5 wt% of the mass concentration of the total oil displacement agent.

[0048] The structure change of the oil displacement agent was characterized by Fourier transform infrared spectrometer, the specific process is as follows:

[0049] An appropriate amount of the above oil displacing agent is freeze-dried, ground and mixed with potassium bromide. The spectrum acquisition adopts a spectral window of 4000-400cm -1 The transmission mode, infrared spectrum test results such as figure 2 shown.

[0050] Depend on figure 2 It can be seen that the free hydroxyl group is a medium-...

Embodiment 3

[0053] Embodiment 3: rheological analysis test

[0054] The series of oil displacing agents prepared in Example 1 and the emulsion prepared from the oil phase were subjected to rheological analysis using an Anton Paar rheometer. The set temperature is 30°C, and the shear rate is 0.1-100s -1 , using a coaxial cylinder system to measure the steady-state rheological properties of the emulsion, the experimental results are as follows image 3 shown.

[0055] Depend on image 3 It can be seen that when the mass ratio of alkyl glycoside APG1214 and dodecyl dihydroxyethyl amine oxide is 7:3, the viscosity of the emulsion is the highest, and the diffusion coefficient of the droplet is the lowest at this time, and the resistance of droplet migration The maximum, resulting in the reduction of its collision frequency and coalescence speed, the highest stability of the emulsion. Under continuous shearing, the viscosity reduction rate of this system is obviously lower than that of othe...

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Abstract

The invention provides an oil-displacing agent composition, an oil-displacing agent and a preparation method and application of the oil-displacing agent. The oil displacement agent composition comprises an alkyl glycoside nonionic surfactant and an amine oxide ampholytic surfactant, wherein the mass ratio of the alkyl glycoside nonionic surfactant to the amine oxide ampholytic surfactant is (6-8):(2-4). The oil displacement agent comprises an alkyl glycoside nonionic surfactant, an amine oxide ampholytic surfactant and water, wherein the mass ratio of the alkyl glycoside nonionic surfactant tothe amine oxide ampholytic surfactant is (6-8):(2-4); wherein the total mass of the alkyl glycoside nonionic surfactant and the amine oxide ampholytic surfactant accounts for 0.3-0.5 wt% of the massconcentration of the total oil displacement agent. The oil-displacing agent has the effects of emulsifying crude oil, reducing oil-water interfacial tension, improving the emulsification stability ofthe crude oil and improving the stability of an oil / water interfacial film, has biodegradability, can be used for tertiary oil recovery and improves the recovery ratio of the crude oil.

Description

technical field [0001] The invention belongs to the field of oil recovery technology, and relates to an oil displacement agent composition, an oil displacement agent and a preparation method and application thereof. Background technique [0002] Since the beginning of the new century, with the rapid growth of people's living standards, domestic energy demand has increased day by day, but various new energy technologies are still in the initial stage and gradually perfected, and oil resources will still be my country's main energy source for a relatively long period of time . At present, my country's dependence on foreign crude oil has exceeded 70%, far exceeding the international oil import safety standards, and seriously threatening national energy security. Traditional oil recovery methods (first and second oil recovery, mainly including depletion recovery and water injection development) can usually only recover 1 / 3 of the crude oil geological reserves, and there is still...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 吴海荣陈欣苟聪博胡宇罗应林李哲屈鸣杨红斌侯吉瑞康万利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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