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A method for enhancing heavy oil recovery with high phase change oil-water in-situ emulsion

A technology of emulsion and recovery, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low production efficiency of heavy oil, achieve high recovery of heavy oil, widen the upper limit of viscosity, The effect of broad application prospects

Active Publication Date: 2022-03-11
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving heavy oil recovery with high phase change oil-water in-situ emulsion for the problem of low heavy oil recovery efficiency in the existing water flooding heavy oil recovery method

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  • A method for enhancing heavy oil recovery with high phase change oil-water in-situ emulsion
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  • A method for enhancing heavy oil recovery with high phase change oil-water in-situ emulsion

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Embodiment Construction

[0030] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0031] Taking the heavy oil reservoir in the J area of ​​Xinjiang Oilfield as an example, the specific application of the method for enhancing heavy oil recovery by the high phase change oil-water in-situ emulsion of the present invention is illustrated.

[0032] Step 1. It is measured that the viscosity of the dehydrated heavy oil produced in J area of ​​Xinjiang Oilfield is 990mPa·s at a reservoir temperature of 55°C, meeting the requirement of less than 6000mPa·s.

[0033] Step 2. Determination of viscosity and phase transition point of crude oil-produced water emulsion

[0034] The dehydrated heavy oil and produced water are preheated to 55°C respectively, and t...

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Abstract

The invention discloses a method for increasing heavy oil recovery by high-phase-change oil-water in-situ emulsion. The method is to carry out water injection development for heavy oil reservoirs whose performance parameters of crude oil emulsion meet the following three specific requirements: (A ) The viscosity of crude oil is less than 6000mPa·s; (B) Under the condition of reservoir temperature, the phase transition point of the crude oil-produced water emulsion is greater than or equal to 70%, and the viscosity of the emulsion corresponding to the phase transition point is 2 to 6 times the viscosity of crude oil; (C) Under reservoir temperature conditions, when the water content is less than or equal to the phase transition point, the ratio of crude oil-produced water emulsion to crude oil mobility is 0.2-0.9. The method of the present invention can expand heavy oil water injection to oil reservoirs with a crude oil viscosity as high as 6000mPa·s, and has broad application prospects and good economic benefits; moreover, high phase change oil-water in-situ emulsion flooding can self-adaptively control fluidity , which is nearly miscible with crude oil, has both wettability improvement and rock surface sliding effect, and has the potential to greatly increase the recovery of heavy oil water flooding.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a new method for increasing the recovery rate of heavy oil by high-phase-change oil-water in-situ emulsion. Background technique [0002] An important resource for the development of the world economy, the potential reserves of heavy oil in the world are six times that of proven conventional crude oil geological reserves. my country's heavy oil resources account for about 30% of the total petroleum resources, and its efficient development is of great significance to ensuring national energy security. Among various heavy oil production methods, water injection and drainage have the least investment and the lowest energy consumption. However, due to the obvious viscosity difference between heavy oil and water, the sweep efficiency of heavy oil in water flooding is low, and the recovery factor is low. Usually, water flooding is only suitable for ordinary heavy oil wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20
CPCE21B43/20G01N33/2823Y10T436/21
Inventor 蒲万芬孙琳谢建勇庞诗师石彦褚艳杰刘锐杜代军
Owner SOUTHWEST PETROLEUM UNIV
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