Electrochemical method of oil removal of wastewater produced in oil extraction by polymer flooding displacement

An oily sewage and polymer technology is applied in the electrochemical field of polymer flooding oil production sewage degreasing, which can solve the problems of unsuitable popularization and high cost, and achieve the effects of easy popularization and application, simple operation, and easy control.

Inactive Publication Date: 2009-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above three technologies are still immature and have not yet reached the stage of industrialization, and the cost is too high to be popularized and used.
[0012] At present, there is no report on the application of electrochemical methods in the deoiling of polymer flooding wastewater at home and abroad.

Method used

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  • Electrochemical method of oil removal of wastewater produced in oil extraction by polymer flooding displacement
  • Electrochemical method of oil removal of wastewater produced in oil extraction by polymer flooding displacement
  • Electrochemical method of oil removal of wastewater produced in oil extraction by polymer flooding displacement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The scale of polymer flooding oil production sewage treatment in the oilfield sewage station is 238m 3 / h, using electrochemical methods for degreasing and purification treatment, the results of the three tests are shown in Table 2. Introduce unidirectional continuous direct current into the polymer flooding oil production sewage, the distance between each pair of cathode and anode electrodes is 0.50 mm, the anode is coated and sintered ruthenium, rhodium, iridium oxide on metal titanium, and the cathode material is stainless steel. The voltage between the negative and positive electrodes is 1V, the current is 9600A, and the current density is 50A / m 2 , the total electrode area is 192m 2 . All electrodes are divided into 10 groups, each group has 60 pairs of electrodes, a total of 600 pairs of electrodes. The electrodes in each group are connected in parallel, and the electrodes in each group are connected in series.

[0030] During the electrolysis process of polym...

Embodiment 2

[0035] The scale of polymer flooding oil production sewage treatment in the oilfield sewage station is 238m 3 / h; The electrochemical method was used for oil removal and purification treatment, and the results of the three tests are shown in Table 3. Into the polymer flooding oil production sewage into regular diverted continuous direct current, the anode is graphite, the cathode material is titanium, the distance between each pair of cathode and anode electrodes is 15 mm, the voltage between each pair of cathode and anode electrodes is 20V, and the current is 9600A, the current density is 1000A / m 2 , the total electrode area is 9.6m 2 , 30 pairs of electrodes connected in parallel.

[0036] Table 3 Example 2 Experimental Results

[0037]

[0038] It can be seen from Table 3 that the oil content in the treated sewage is less than 30mg / L, which can basically meet the oil content requirements of reinjected sewage.

Embodiment 3

[0040] The scale of polymer flooding oil production sewage treatment in the oilfield sewage station is 238m 3 / h; The electrochemical method was used for oil removal and purification treatment, and the results of the three tests are shown in Table 4. Introduce unidirectional pulsed direct current into the polymer flooding oil production sewage, the voltage between each pair of cathode and anode electrodes is 5.12V, the current is 9600A, 10 pairs of electrodes are connected in parallel, and the total electrode area is 3.2m 2 , the current density is 3000A / m 2 , the distance between each pair of cathode and anode electrodes is 50 mm, the gap between each pair of cathode and anode electrodes is filled with fast ion conductors, the anode is conductive ceramics, and the cathode material is conductive film.

[0041] Table 4 Example 3 Experimental Results

[0042]

[0043] The experimental data in Table 4 shows that the oil content in the treated sewage is less than 30 mg / L, whic...

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Abstract

The invention discloses an electrochemical method of oil removal by polymer flooding oil recovery wastewater, which comprises the following steps of: 1, electrolysis; 2, sedimentation. In the process of the electrolysis, tiny oil droplets in the wastewater lose electrons due to discharge on the surface of an anode, charges on the surface of the oil droplets are reduced, and electric potential of interface xi is decreased; and residual polymer pieces in the wastewater after the electrolysis are oxidized and degraded, viscosity of the wastewater is decreased, and water film intensity on the interface of oil/water is reduced. Therefore, the tiny oil droplets after the electrolysis are liable to be converged into large oil droplets and are rapidly separated from the wastewater under the action of cathode hydrogen. As treated by the method, crude oil in wastewater produced in oil extraction by polymer flooding displacement is quite easy for removal with no need for large use of sedimentation tanks, thus saving construction fund for oilfield; the invention has simple process, requires no drug, saves resource and cost and conforms to green chemistry process, quality of the wastewater after the oil removal is obviously crystal-clear; in addition, the device is convenient and safe in operation, easy to control and realize automation, extensively adapted to the amount of water, and convenient for popularization and application.

Description

technical field [0001] The invention belongs to the field of polymer flooding oil production sewage treatment, in particular to an electrochemical method for removing oil from polymer flooding oil production sewage. Background technique [0002] With the continuous exploitation of oilfields, oil recovery technology continues to develop. It has experienced primary, secondary and tertiary oil recovery successively. Primary oil recovery is driven by natural energy; secondary oil recovery uses artificial water injection to maintain formation pressure; tertiary oil recovery improves oil recovery by changing the characteristics of injected water. The water-containing crude oil extracted from the ground is called "production fluid", and the water separated from the production fluid is called "oilfield produced water", also known as "oilfield sewage". [0003] After the oilfield enters the stage of water injection development, a large amount of oilfield produced water (oilfield se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/465
Inventor 游革新
Owner SOUTH CHINA UNIV OF TECH
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