Treating method and process flow for wastewater from oilfield

A treatment method and process technology, which is applied in the field of oily sewage treatment process, can solve the problems of low oil-water separation efficiency, large floor area, easy clogging, etc., and achieve the effect of realizing resource utilization and solving corrosion and scaling

Active Publication Date: 2017-08-22
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Abstract
  • Description
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Problems solved by technology

These processes have many disadvantages, such as low oil-water separation efficiency, poor filtration effect, large floor area, easy to block, etc.
At present, biological treatment of oily wastewater has also become a development trend, but there are also disadvantages such as large fluctuations in water quality, poor adaptability of strains, and serious pollution of membranes by extracellular polymers.

Method used

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  • Treating method and process flow for wastewater from oilfield

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Treatment of oilfield produced water with high oil content, high sulfur content, and high bacterial content

[0035] 1. The produced water from the oil field is pretreated by multi-stage sedimentation in box-type settling tanks to remove part of the suspended solids, dispersed oil and slick oil;

[0036] 2. Then, the oil, water and solids are preliminarily separated through the sedimentation homogeneous adjustment tank, and 50-80 mg / L iron remover sodium hypochlorite and 50-150 mg / L sulfur remover zinc chloride are added to the oil production sewage, respectively. Remove iron and sulfide from iron and sulfide; then add 1.0 mg / L polyacrylamide organic polymer coagulant of 12 million units to flocculate the petroleum and suspended solids in the sewage;

[0037] 3. The treated oil production sewage enters the three-phase cyclone separation tank for oil, water and solid three-phase separation treatment again;

[0038] 4. After the three-phase separation, the oil...

Embodiment 2

[0044] Example 2: Treatment of oilfield produced water with high iron content, high oil content, and high bacterial content

[0045] 1. The produced water from the oil field is pretreated by multi-stage sedimentation in box-type settling tanks to remove part of the suspended solids, dispersed oil and slick oil;

[0046] 2. Then, the oil, water and solids are preliminarily separated through the sedimentation homogeneous adjustment tank, and 50-150 mg / L iron remover sodium hypochlorite and 40-80 mg / L sulfur remover zinc sulfate are added to the produced water, respectively. Remove iron and sulfur from iron and sulfide; then add 1.5 mg / L polyacrylamide organic polymer coagulant of 10 million units to flocculate the petroleum and suspended solids in the sewage;

[0047] 3. The treated oil production sewage enters the three-phase cyclone separation tank for oil, water and solid three-phase separation treatment again;

[0048] 4. After the three-phase separation, the oil production...

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Abstract

The invention discloses a treating method and process flow for wastewater from an oilfield. Wastewater from oilfield is subjected to pretreatment with an improved three-stage settling tank at first, then to secondary treatment with a three-phase hydrocyclone separation tank, a pressure dissolved air floatation tank and a water purification unit and finally to deep treatment with a filtering unit so as to meet water quality requirements on reinjection water. The process flow can overcome the problem that wastewater from the oilfield is high in oil content, sulfur content, iron content, bacteria content and mineralization, enables treated wastewater to meet standard requirements on water quality prescribed in Indexes and Analysis Methods for the Quality of Injection Water for Clastic Rock Reservoirs, and has the characteristics of stable water treatment, high recovery rate of oilfield water, environmental protection and accordance with standards.

Description

technical field [0001] The invention belongs to the treatment process of oily sewage, and mainly relates to a treatment method and process flow of oilfield produced water. Background technique [0002] At present, with the continuous exploitation of oilfields, the formation energy gradually decreases, the liquid level of oil wells decreases or even the oil supply is insufficient, and the production of oil wells drops sharply. Most of my country's oil fields have entered the middle or late stage of oil development. In order to maintain or increase the pressure of oil reservoirs, make oil fields high and stable, and improve oil recovery, oil fields have gradually entered the stage of water injection production. However, the oilfield produced water not only contains petroleum such as dispersed oil, slick oil and emulsified oil, but also contains sulfide, Fe 2+ Reducing pollutants such as sulfate reducing bacteria, iron bacteria and saprophytic bacteria and other microorganisms...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F1/001C02F1/24C02F1/28C02F1/38C02F1/50C02F1/56C02F5/14C02F9/00C02F2001/007C02F2103/10C02F2301/08
Inventor 路建萍李俊华朱杰王佳沈燕宾谢元
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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