Anti-pollution energy-saving filtering device for oilfield produced water and method thereof

A filtration device and a technology for produced water, applied in the directions of filtration separation, separation method, filtration loop, etc., can solve the problems of energy waste, filter material loss, poor filter material cleaning effect, etc., to reduce labor intensity, improve life and cycle. , the effect of saving labor time

Inactive Publication Date: 2020-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device adopts two-stage filtration of the filter screen and the filter material, and the backwash adopts the method of washing the filter screen with a small flow rate and washing the filter material with a large flow rate, and the backwashing time is automatically controlled according to the turbidity, which solves the problem of poor cleaning effect of the filter material in the prior art , filter material loss and energy waste

Method used

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  • Anti-pollution energy-saving filtering device for oilfield produced water and method thereof

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Experimental program
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Effect test

Embodiment 1

[0064] A block A of Shengli Oilfield 12 The daily water output is 1.2×10 3 m 3 , the oil content of the produced water is 55.3 mg / L, and the suspended solid content is 31.5 mg / L, which is filtered by the filtering device and method of the present invention.

[0065] Test operation parameters: water inflow speed is 20m 3 / h, the small displacement flushing intensity of the spiral backwash nozzle is 6L / s.m 2 , the strength of backwash filter material with large flow backwash pump is 10L / s.m 2 .

[0066] Test operation results: the outlet oil content is 2.0mg / L, and the suspended solid content is 0.7mg / L, reaching the first-grade standard of oilfield reinjection water quality. Compared with conventional emery filters, the oil content of the effluent water is reduced by 64.9%, and the suspended solid content is reduced by 72.0%. With the conventional walnut shell filter, the oil content of the effluent is reduced by 42.9%, and the suspended solid content is reduced by 85.1%. ...

Embodiment 2

[0069] A block B of Shengli Oilfield 15 The daily water output is 4.0×10 3 m 3 , the oil content of the produced water is 102.5 mg / L, and the filtering device and method of the present invention are used for filtering.

[0070] Test operation parameters: water inflow speed is 15m 3 / h, the small displacement flushing intensity of the spiral backwash nozzle is 8L / s.m 2 , the strength of backwash filter material with large flow backwash pump is 16L / s.m 2 .

[0071] Test operation results: the outlet oil content is 2.8mg / L, the suspended solid content is 0.9mg / L, reaching the first-grade standard of oil field reinjection water quality, compared with conventional emery filters, the oil content is reduced by 68.2%, and the suspended solid content is reduced by 82.0%. Compared with conventional Walnut shell filter, the oil content is reduced by 62.7%, and the suspended solid content is reduced by 89.7%.

[0072] Compared with conventional emery filter and walnut shell filter, ...

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Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to an oilfield produced water treatment system, and particularly relates to an anti-pollution energy-saving filtering device for oilfield produced water and a method thereof. The device is composed of a filtering tank, a filtering water inlet part, a filtering water outlet part, a backwashing water inlet part, abackwashing water outlet part and a frequency conversion control part, the filtering water inlet part and the backwashing water outlet part are located at the top of the filtering tank, and the filtering water outlet part and the backwashing water inlet part are located on the left side face of the filtering tank. According to the invention, a two-stage backwashing mode of washing a filter screenwith small flow and washing a filter material with large flow is adopted, and the backwashing time is automatically controlled according to the turbidity of backwashing effluent, so that the problemsof poor cleaning effect, loss of the filter material, waste of backwashing water and electricity and the like caused by fixed cleaning time of the filter material in the prior art are solved. Therefore, the device can be widely applied to the technical field of oil field oily sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an oilfield produced water treatment system, in particular to an anti-pollution and energy-saving filter device and method for oilfield produced water. Background technique [0002] Most oilfields in China have entered the stage of high water cut development. In order to continue to improve oil recovery, chemical flooding methods are usually used, such as: polymer flooding, binary compound flooding, ASP flooding and microbial flooding. The composition of the produced water is relatively complex, which makes the treatment of produced water more difficult. [0003] Traditional oilfield produced water filtration devices have the following problems: [0004] 1. The screen pipe water distribution system is adopted, and the holes are too large. After the large particle pollutants enter the filter with the water, the backwash is not easy to flush out from the screen pipe, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D36/02B01D35/16
CPCB01D35/16B01D36/02
Inventor 王刚于滨刘正郝金克蒋贤儒汪云家马继良陈玲刘恩新栾智勇
Owner CHINA PETROLEUM & CHEM CORP
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