Oily sewage physical demulsification method for oil field

A technology for oily sewage and demulsification, which is applied in separation methods, grease/oily substance/float removal devices, liquid separation, etc., can solve the problems of increasing the post-treatment process of the demulsifier, increasing the energy consumption of the treatment, and increasing the cost, etc. Achieve the effect of small footprint, saving dosing costs, and low energy consumption

Active Publication Date: 2012-10-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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AI Technical Summary

Problems solved by technology

[0007] The above physical demulsification methods either need power equipment, which increases the energy consumption of the treatment, or need to add demulsifiers, which not only increases the cost, but also needs to increase the post-treatment process of the demulsifiers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Example 1: Primary demulsification treatment method for oily sewage to be treated with oil content ≤ 100mg / L:

[0015] 1. First, the oily sewage is aerated to remove free oil, flocs and particles to obtain treated water A1.

[0016] 2. Pass the treated water A1 through the Venturi tube to control the pressure of the oily sewage at the throat of the Venturi tube to be lower than the saturated vapor pressure of the treated environmental water at that time, and then use lipophilic materials to absorb free oil molecules, so that the oil molecules gather to form oil droplets After separation and removal, the treated water A2 is obtained.

[0017] Processing effect: The oil content of treated water A2 is ≤30mg / L.

example 2

[0018] Example 2: Primary demulsification treatment method for oily sewage to be treated with oil content ≤ 50mg / L:

[0019] 1. First, the oily sewage is aerated to remove free oil, flocs and particles to obtain treated water B1.

[0020] 2. The inner wall of the throat of the Venturi tube is treated with hydrophilic modification, and a positive DC voltage of 1.0-1.2mv is applied to the inner wall.

[0021] Pass the treated water B1 through the Venturi tube to control the pressure of the oily sewage at the throat of the Venturi tube to be lower than the saturated vapor pressure of the treated environmental water at that time, and then use lipophilic materials to absorb free oil molecules, so that the oil molecules gather to form oil droplets and then separate Removed to obtain treated water B2.

[0022] Processing effect: The oil content of treated water B2 is ≤10mg / L.

example 3

[0023] Example 3: Secondary demulsification treatment method for oily sewage to be treated with oil content ≤ 100mg / L:

[0024] 1. First, the oily sewage is aerated to remove free oil, flocs and particles to obtain treated water C1.

[0025] 2. The inner wall of the throat of the first group of Venturi tubes is treated with hydrophilic modification, and a positive DC voltage of 1.0-1.2mv is applied to the inner wall.

[0026] Pass the treated water C1 through the first group of Venturi tubes to control the pressure of the oily sewage at the throat of the Venturi tube to be lower than the saturated vapor pressure of the treated environmental water at that time, and then use lipophilic materials to absorb free oil molecules, so that the oil molecules gather to form oil After dropping, it was separated and removed to obtain treated water C2.

[0027] 3. The inner wall of the throat of the second group of Venturi tubes is treated with hydrophilic modification, and a positive DC v...

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Abstract

The invention provides an oily sewage physical demulsification method for an oil field, belongs to the technical field of oil fields, and particularly provides a technical method for carrying out physical demulsification on oil-in-water or water-in-oil type emulsified liquid. Oily sewage passes through a Venturi tube; the pressure of the oily sewage at the throat part of the Venturi tube is controlled to be lower than saturated vapor pressure of water; and free oil molecules are absorbed by using an oleophylic material, so that the oil molecules are separated and removed after being gathered to form oil drops. With the adoption of the oily sewage physical demulsification method, the oily sewage with an oil amount which is less than or equal to 100 mg/L can be treated. After the oily sewage is treated by a system, the oil removing rate can reach to be more than 90%, and the oilfield reinjection water standard can be reached without adding a demulsifier, using extra power equipment and carrying out biochemical treatment. Furthermore, the oily sewage physical demulsification method has the characteristics of being low in energy consumption, small in occupied area and the like. With the adoption of the oily sewage physical demulsification method provided by the invention, no chemical agent is added, so that the cost caused by adding the chemical agent can be saved by 0.4-0.6 Yuan/m<3>.

Description

technical field [0001] The invention belongs to the technical field of oilfields, in particular to a technical method for physically breaking oil-in-water (O / W) or water-in-oil (W / O) emulsions in low-permeability oilfield reinjection water treatment technology. Background technique [0002] In recent years, the development of most domestic oilfields has entered a period of high water cut, and the application of various extraction technologies has led to the recovery of crude oil in the form of emulsion. According to statistics, nearly 80% of the crude oil extracted in the world exists in the form of crude oil emulsion, and the amount of oily emulsified sewage is also increasing day by day. An oil-water emulsion is a multiphase system in which at least one liquid is uniformly dispersed in an immiscible liquid in the form of droplets, and the diameter of the droplets is usually greater than 0.1 μm. At least one liquid in most emulsions is water or an aqueous solution. In prac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/40
Inventor 杨海滨罗江涛郭鹏唐海军杨帆庄建全王小兵
Owner CHINA PETROLEUM & CHEM CORP
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