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A kind of surfactant micellar oil displacement agent

A technology of surfactant and oil-displacing agent, which is applied in the field of nano-particle-enhanced surfactant micelle oil-displacing system, can solve the problems of loss of viscosity, short validity period of unblocking, safety risks, etc., so as to improve oil resistance, The effect of viscosity recovery and reduction of oil-water interfacial tension

Inactive Publication Date: 2019-03-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The oil displacement system mainly increases the viscosity of the solution by adding polymer (HPAM), but during the configuration and pumping of the polymer solution, the viscosity loss exceeds 60-70% after entering the formation due to shearing, The shear degradation of polymer seriously reduces the effect of chemical flooding. Therefore, in order to ensure that the oil displacement system entering the formation can have a high viscosity, it is necessary to use a high-concentration polymer system, which greatly increases the cost of chemical flooding.
[0005] (2) During the long-term injection of the polymer-containing flooding system, the residual polymer in the near-wellbore area of ​​the injection well and the production well will be cross-linked to cause formation plugging, and the use of an oxidant system for plugging removal operations not only has safety risks, but also At the same time, the effective period of plugging removal is short, which seriously affects the productivity of oil and water wells
[0006] (3) For medium and low permeability reservoirs, due to the limitation of formation pore throat size, it is difficult for polymer solution to be injected into the formation, so the method of viscosification by adding polymers is not suitable for such formations
However, the traditional surfactant micelles have poor oil resistance and will lose viscosity when encountering a small amount of crude oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 0.3g lauryl amidopropyl betaine, 0.1g sodium lauryl sulfate, 1g particle diameter is 7nm silica sol and 4gNaCl, add to 94.6g distilled water and mix, the weight percentage of each component The sum is 100%, and the shear rate is 7.34s at 50°C measured with a Brookfield viscometer -1 The viscosity of the lower system is 44.18mPa.s, adding 1% crude oil to the system, the viscosity is reduced to 25.3mPa.s, and if there is no nano-silica sol in the system, the viscosity of the 1% crude oil system is only 1.2mPa.s, so the system shows good oil resistance. The interfacial tension between the above system and crude oil was measured by Texas-500 spinning drop interfacial tensiometer to be 0.42mN / m, and the permeability was 1950×10 -3 μm 2 The oil displacement performance of the system was evaluated with the sand-packed pipe, and the results are shown in Table 1. It can be seen that the nanoparticle-enhanced surfactant micellar oil displacement system increased the oil re...

Embodiment 2

[0020] Weigh 0.45g lauryl amidopropyl betaine, 0.15g sodium lauryl sulfate, 0.6g particle size of 7nm silica sol and 3gNaCl, add to 95.8g distilled water and mix, the weight percentage of each component The sum is 100%, and the shear rate is 7.34s at 50°C measured with a Brookfield viscometer -1 The viscosity of the lower system is 49.3mPa.s, adding 1% crude oil to the system, the viscosity is reduced to 20.1mPa.s, and if there is no nano-silica sol in the system, the viscosity of the 1% crude oil system is only 1.12mPa.s, so the system shows good oil resistance. The interfacial tension between the above system and crude oil was measured to be 0.23mN / m by Texas-500 spinning drop interfacial tensiometer, and the permeability was 1980×10 -3 μm 2 The oil displacement performance of the system was evaluated with the sand-packed pipe, and the results are shown in Table 2. It can be seen that the nanoparticle-enhanced surfactant micellar oil displacement system increased the oil re...

Embodiment 3

[0024] Weigh 0.6g lauryl amidopropyl betaine, 0.2g sodium lauryl sulfate, 0.3g particle size of 7nm silica sol and 2gNaCl, add to 96.9g distilled water and mix, the weight percentage of each component The sum is 100%, and the shear rate is 7.34s at 50°C measured with a Brookfield viscometer -1 The viscosity of the lower system is 46.38mPa.s, adding 1% crude oil to the system, the viscosity is reduced to 12.88mPa.s, and if there is no nano-silica sol in the system, the viscosity of the 1% crude oil system is only 1.06mPa.s, so the system shows good oil resistance. The interfacial tension between the above system and crude oil was measured by Texas-500 spinning drop interfacial tensiometer to be 0.21mN / m, and the permeability was 2034×10 -3 μm 2 The oil displacement performance of the system was evaluated with the sand-packed pipe, and the results are shown in Table 3. It can be seen that the nanoparticle-enhanced surfactant micellar oil displacement system increased the oil re...

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Abstract

The invention relates to a surfactant micellar oil displacement agent, which is used for chemical flooding of crude oil to enhance recovery. The micellar oil displacing agent consists of 0.3%-0.6% of the total weight of lauryl amidopropyl betaine, 0.1%-0.2% of the total weight of sodium lauryl sulfate, 0.3-1.0% of the total weight Nano-silica sol, sodium chloride accounting for 2-4% of the total weight and the balance of water are mixed, wherein the particle size of the nano-silica sol is 7nm, and the sum of the weight percentages of each component is 100 %. The addition of nano-silica strengthens the oil resistance and viscoelasticity of the micellar oil displacement system, improves its ability to reduce the interfacial tension of oil and water, not only improves the oil washing efficiency, but also improves the sweep coefficient. As an oil displacement agent for tertiary oil recovery, The recovery rate can be increased by more than 7% on the basis of water flooding.

Description

Technical field: [0001] The invention relates to a chemical oil displacement agent for crude oil, in particular to a surfactant micellar oil displacement system strengthened by nanoparticles, and belongs to the technical field of enhanced oil recovery. Background technique: [0002] Chemical flooding technology is the main method to further enhance oil recovery after primary oil recovery (self-spraying production) and secondary oil recovery (water injection development) in my country's oilfields. There are two mechanisms for chemical flooding to increase oil recovery: one is to increase The viscosity of the oil system is used to increase the sweep coefficient, and the second is to increase the oil washing efficiency by reducing the oil-water interfacial tension and changing the wettability of the formation. [0003] Although the indoor research and field application of chemical flooding have achieved good results in enhancing oil recovery (indoor tests show that chemical floo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/30
Inventor 蒋平张磊葛际江张贵才李鹤裴海华孙铭勤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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