Oil-in-water emulsion oil displacement agent

The technology of oil-in-water emulsion and oil-displacing agent is applied in the directions of drilling compositions, chemical instruments and methods, etc., and can solve the problems of short period of validity of plugging removal, increase the cost of chemical flooding, reduce the effect of chemical flooding, etc. The effect of improving viscosity and stability

Inactive Publication Date: 2017-06-27
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 process 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, causing 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 1g of nano-silica sol, 0.02g of octadecyl dimethyl amine oxide and 5g of No. 5 white oil and add it to 93.98g of water, and stir at 3000 rpm for 10 minutes to form an oil-in-water emulsion. The shear rate is 7.34s at 20°C measured with a Brookfield viscometer -1 The viscosity of the lower system is 56.3mPa.s, the stability time reaches 63 days, and the permeability is 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 emulsion flooding system increases the recovery by 43.91%.

[0020] Table 1 Enhanced oil recovery effect of nanoparticle-enhanced surfactant micellar flooding system

[0021] Permeability / ×10 -3 μm 2

Embodiment 2

[0023] Weigh 3g of nano-silica sol, 0.1g of octadecyl dimethyl amine oxide and 7g of No. 5 white oil into 89.9g of water, and stir at 3000 rpm for 10 minutes to form an oil-in-water emulsion. The shear rate is 7.34s at 20°C measured with a Brookfield viscometer -1 The viscosity of the lower system is 83.4mPa.s, the stability time reaches 68 days, and the permeability is 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 emulsion flooding system increases the recovery by 38.94%.

[0024] Table 2 Enhanced oil recovery effect of nanoparticle-enhanced surfactant micellar flooding system

[0025] Permeability / ×10 -3 μm 2

Embodiment 3

[0027] Weigh 5g of nano-silica sol, 0.2g of octadecyl dimethyl amine oxide and 10g of No. 5 white oil and add it to 84.8g of water, and stir at 3000 rpm for 10 minutes to form an oil-in-water emulsion. The shear rate is 7.34s at 20°C measured with a Brookfield viscometer -1 The viscosity of the lower system is 102.8mPa.s, the stability time reaches 71 days, and the permeability is 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 emulsion flooding system increases the recovery by 47.03%.

[0028] Table 3 Enhanced oil recovery effect of nanoparticle-enhanced surfactant micellar flooding system

[0029] Permeability / ×10 -3 μm 2

[0030] The emulsion stabilized by the nanoparticles and the surfactant reduces the dosage of the surfactant, and at the same time greatly improves the stability of the emulsion, showing an excellent ability to enhance oil r...

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Abstract

The invention discloses an oil-in-water emulsion oil displacement agent for crude oil chemical flooding for recovery efficiency improvement. The oil-in-water emulsion oil displacement agent is prepared from, by weight, 1-5 % of nano silica sol, 0.02-0.2% of octadecyl dimethylamine, 5-10% of 5 # white oil and the balance water and is prepared through mixing, wherein the particle size of the nano silica sol is 7-12 nm, and the weight percentage content sum of the components is 100%. The viscosity and stability of oil-in-water emulsion is improved by adding nano silica, the oil-in-water emulsion can improve the displacement efficiency of chemical flooding and also improve sweep efficiency and can improve the displacement efficiency by 30% or above based on water flooding by serving as the oil displacement agent for tertiary oil recovery.

Description

[0001] Technical field: [0002] The invention relates to a chemical oil displacement agent for crude oil, in particular to an oil-in-water displacement system strengthened by nanoparticles, and belongs to the technical field of enhanced oil recovery. [0003] Background technique: [0004] Chemical flooding technology is the main method to further improve 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. [0005] Although the indoor research and field application of chemical flooding have achieved good results in enhancing oil recovery (indoor tests show that chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/10
Inventor 蒋平毛源唐存知裴海华葛际江李月胜张贵才唐林李文轩李有才毕爱文
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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