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Surfactant micelle oil displacement agent

A technology of surfactant and oil displacement agent, which is applied in the field of nanoparticle-enhanced surfactant micellar oil displacement system, can solve problems such as loss of viscosity, short validity period of plugging removal, and existence of safety risks, so as to improve oil resistance, Effect of reducing oil-water interfacial tension and restoring viscosity

Inactive Publication Date: 2017-04-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (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.
[0007] (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
[0008] (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

[0020] Weigh 0.3g of lauramidopropyl betaine, 0.1g of sodium lauryl sulfate, 1g of silica sol with a particle size of 7nm and 4g of NaCl, add them to 94.6g of distilled water and mix, the weight percentage of each component is 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 reduces the viscosity to 25.3mPa.s. If there is no nano-silica sol in the system, the viscosity of the system adding 1% crude oil is only 1.2mPa.s, so the system showed good oil resistance. The interfacial tension between the above system and crude oil was measured by a Texas-500 rotating drop interfacial tension meter, which was 0.42mN / m, and the permeability was 1950×10 -3 μm 2 The oil displacement performance of the system was evaluated by using the sand-packed pipe of 2000-2000. The results are shown in Table 1. It can be seen that the nanoparticle-enhanced surfactant micelle...

Embodiment 2

[0024] Weigh 0.45g of lauryl amidopropyl betaine, 0.15g of sodium lauryl sulfate, 0.6g of silica sol with a particle size of 7nm and 3g of NaCl, add them to 95.8g of 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 reduces the viscosity to 20.1mPa.s. If there is no nano-silica sol in the system, the viscosity of the system adding 1% crude oil is only 1.12mPa.s, so the system shows good oil resistance. The interfacial tension between the above system and crude oil was measured by a Texas-500 rotating drop interfacial tension meter, which was 0.23mN / m, and the permeability was 1980×10 -3 μm 2 The oil displacement performance of the system was evaluated by using the sand-packing tube of 1999. The results are shown in Table 2. It can be seen that the nanoparticle-enhanced surfactant micelle ...

Embodiment 3

[0028] Weigh 0.6g of lauryl amidopropyl betaine, 0.2g of sodium lauryl sulfate, 0.3g of silica sol with a particle size of 7nm and 2g of NaCl, add them to 96.9g of 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 reduces the viscosity to 12.88mPa.s. If there is no nano-silica sol in the system, the viscosity of the system adding 1% crude oil is only 1.06mPa.s, so the system showed good oil resistance. The interfacial tension between the above system and crude oil was measured by a Texas-500 rotating drop interfacial tension meter, which was 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 of 100 ℃. The results are shown in Table 3. It can be seen that the nanoparticle-enhanced surfactant micelle oil...

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Abstract

The invention relates to a surfactant micelle oil displacement agent which is used for increasing recovery rate of crude oil chemical flooding. The micelle oil displacement agent includes, by weight, 0.3-0.6% of lauramide propyl betaine, 0.1-0.2% of lauryl sodium sulfate, 0.3-1.0% of nano silicon dioxide sol, 2-4% of sodium chloride, and the balanced being water, wherein all the components are mixed together to prepare the micelle oil displacement agent. The particle size of the nano silicon dioxide sol is 7 nm, the sum of the weight percentage ratios of the components is 100%. By adding the nano silicon dioxide, the micelle oil displacement agent is improved in oil resistance and viscoelasticity and is improved in the capability of reducing oil-water interface tension, so that not only is displacement efficiency increased but also sweep efficiency is increased. As an oil displacement agent for tertiary oil recovery, the micelle oil displacement agent can increase the recovery rate by more than 7% on the basis of water flooding.

Description

[0001] Technical field: [0002] The invention relates to a chemical oil displacement agent for crude oil, in particular to a nanoparticle-enhanced surfactant micelle oil displacement system, and belongs to the technical field of enhanced oil recovery. [0003] Background technique: [0004] Chemical flooding technology is the main method to further improve oilfield oil recovery after primary oil recovery (self-injection production) and secondary oil recovery (water injection development) in my country's oilfields. The viscosity of the oil system can improve the sweep coefficient, and the second is to improve the oil washing efficiency by reducing the oil-water interfacial tension and changing the wettability of the formation. [0005] Although the laboratory research and mine application of chemical flooding have achieved good results in enhancing oil recovery (laboratory experiments have shown that chemical flooding can further improve oil recovery by more than 20% on the basi...

Claims

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Application Information

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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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