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Method for improving thickened oil recovery ratio through high-phase-change oil-water in-situ emulsion

An emulsion and oil recovery technology, which is applied in the fields of production fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of low production efficiency of heavy oil, and achieve enhanced oil recovery and enhanced oil recovery. , the effect of widening the upper limit of viscosity

Active Publication Date: 2021-09-07
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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  • Method for improving thickened oil recovery ratio through high-phase-change oil-water in-situ emulsion
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  • Method for improving thickened oil recovery ratio through 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 improving the thickened oil recovery ratio through high-phase-change oil-water in-situ emulsion. According to the method, water injection development is conducted on a thickened oil reservoir with performance parameters of crude oil emulsion meeting the following three specific requirements at the same time, wherein the three specific requirements include that (A) the viscosity of crude oil is smaller than 6000mPa.s; (B) under the reservoir temperature condition, the phase change point of crude oil-produced water emulsion is larger than or equal to 70%, and the viscosity of the emulsion corresponding to the phase change point is 2-6 times that of the crude oil; and (C) under the reservoir temperature condition, when the water content is smaller than or equal to the phase change point, the fluidity ratio of the crude oil-produced water emulsion to the crude oil is 0.2-0.9. According to the method, thickened oil water injection can be expanded to the reservoir with the viscosity of the crude oil as high as 6000mPa.s, and wide application prospects and good economic benefits are achieved; and in addition, the fluidity can be controlled in a self-adaptive mode through oil displacement of the high-phase-change oil-water in-situ emulsion, the high-phase-change oil-water in-situ emulsion is in a near-miscible phase with the crude oil, meanwhile, the wettability is improved, the rock surface slippage effect is achieved, and the potential of greatly improving the thickened oil water-drive recovery ratio is achieved.

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...

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Application Information

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Patent Type & Authority Applications(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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