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Oil-water separation device and method for water-in-oil emulsion

An oil-water separation device and water-in-oil emulsion technology, which is applied in the field of oilfield chemistry, can solve the problems of increasing the amount of demulsifier, high operating pressure, and increased cost, and achieve the effects of long maintenance-free time, low cost, and wide application range

Inactive Publication Date: 2017-10-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, some researchers proposed to use CO 2 Demulsification of water-in-oil emulsion has achieved good results, but the operating pressure is as high as several hundred MPa, which puts higher requirements on the equipment and increases the cost accordingly
However, if a demulsifier is used only for demulsification, in order to obtain a good demulsification effect, it is necessary to increase the amount of demulsifier, resulting in a sharp increase in cost

Method used

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  • Oil-water separation device and method for water-in-oil emulsion
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  • Oil-water separation device and method for water-in-oil emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Take 1000g of water-in-oil emulsion, divide it into five parts, add demulsifier according to the concentration of 0, 50, 100, 190, 300mg / L respectively and stir well, balance at 70°C for 4 hours, rely on demulsifier and gravity Oil and water are separated by differentiation, and the demulsification efficiencies are: 0, 27.50%, 39.71%, 54.72% and 63.25%.

Embodiment 2

[0033] Take 5000g of water-in-oil emulsion, divide it into five parts, add demulsifier according to the concentration of 0, 50, 100, 190 and 300mg / L respectively and stir well, pump it into the filling thickness at a flow rate of 2mL / min at 21°C It is a 6.8cm short-tube coalescing device. After flowing out of the coalescing device and balancing in the oil-water gravity device for 4 hours, the oil and water are further separated. The measured demulsification efficiency is: 13.48%, 82.19%, 85.11%, 91.34% , 96.59%.

Embodiment 3

[0035] Configure five water-in-oil emulsions with the same demulsifier concentration as in Example 2, pump them into a long tube coalescing device with a filling thickness of 14.0 cm at a flow rate of 2 mL / min, and flow out from the coalescing device in the oil-water gravity device After equilibrating for 4 hours, the measured demulsification efficiencies were: 22.88%, 87.66%, 90.06%, 94.25%, 99.39%.

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Abstract

The invention belongs to the field of oil field chemistry, and in particular relates to an oil-water separation device for water-in-oil emulsion, which uses a small amount of demulsifier and water-wet porous particles to break the water-in-oil emulsion and realize oil-water separation. An oil-water separation device for water-in-oil emulsions, including: an emulsified water droplet coalescence device, and an oil-water gravity separation device. The invention can reduce the water content of crude oil to less than 1.0% at low demulsifier concentration, lower temperature and shorter time, which is energy-saving, environment-friendly and highly efficient; the raw materials of the water-wet porous particles used are common and the cost is low; During the process of the emulsion flowing through the coalescence device, since the surface of the water-wet porous particles is always covered by the water film due to capillary action, it can exert its performance for a long time, and the oil-water separation efficiency is always maintained at a high level, and the maintenance-free time is long; the overall The structure is simple, easy to manufacture and maintain, and the manufacture and maintenance cost is low; it is suitable for various types of water-in-oil emulsions and has a wide range of applications.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to an oil-water separation device and method for water-in-oil emulsions. A small amount of demulsifier and water-wet porous particles are used to demulsify water-in-oil emulsions and realize oil-water separation. separate. Background technique [0002] The water-in-oil emulsion formed during the development of oilfields, especially heavy oil oilfields, due to its high viscosity, will block high-permeability areas, increase displacement pressure, and enhance oil recovery. However, due to the strong stability of the produced water-in-oil emulsion, it brings great challenges to demulsification. Currently commonly used oil-water separation methods include gravity fractionation, chemical methods, heat treatment, mechanical methods, and membrane filtration. However, these methods have disadvantages such as high cost and energy consumption, low separation efficiency, and long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/05
Inventor 董明哲李亚军宫厚健
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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