Tech. process for reducing mineralization of extracting oil sewage

A technology for oil extraction sewage and a process method, applied in the field of water treatment, can solve the problem of high treatment cost, and achieve the effects of simple operation and management, improved membrane flux, and extended life.

Inactive Publication Date: 2005-11-09
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water quality of reverse osmosis is excellent, which fully meets the requirements of preparing polymer flooding water, but its biggest disadvantage is that the treatment cost is too high, so it is difficult to popularize in oilfield sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Treat 500 tons of oil production sewage every day, send the oil production sewage into the natural settlement tank, and after staying for 10 hours, enter the coagulation settlement tank, add 10 mg / L polyaluminum for coagulation and sedimentation treatment, the effective residence time is 5 hours, The effluent from the settling tank is sent to the air flotation tank for treatment, the reflux ratio is controlled to be 0.1, and the dissolved air pressure is 1 atmosphere. The water treated in the air flotation tank enters the first-stage single-layer quartz sand filter, maintaining a filtration rate of 3 m / h, a backwash intensity of 10 liters / second·square meter, a backwash cycle of 24 hours, and a backwash time of 10 minutes. The effluent from the first-level single-layer quartz sand filter enters the second-level single-layer quartz sand filter for filtration, the filtration rate is 2 m / h, the backwash intensity is 10 liters / second·square meter, the backwash cycle is 24 ho...

Embodiment 2

[0033] Treat 1,000 tons of oil production sewage every day, send the oil production sewage into the natural settlement tank, and after staying for 15 hours, enter the coagulation settlement tank, add 50 mg / L of polyaluminum for coagulation and sedimentation treatment, the effective residence time is 7 hours, The effluent from the settling tank is sent to the air flotation tank for treatment, the reflux ratio is controlled to be 0.2, and the dissolved air pressure is 2 atmospheres. The treated water in the air flotation tank enters the first-stage single-layer quartz sand filter, maintaining a filtration rate of 5 m / h, a backwash intensity of 12 liters / second·square meter, a backwash cycle of 30 hours, and a backwash time of 15 minutes. The effluent from the first-level single-layer quartz sand filter enters the second-level single-layer quartz sand filter for filtration, the filtration rate is 4 m / h, the backwash intensity is 12 liters / second·square meter, the backwash cycle is...

Embodiment 3

[0037] Treat 5,000 tons of oil production sewage every day, send the oil production sewage into the natural settlement tank, and after staying for 20 hours, enter the coagulation settlement tank, add 50 mg / L polymeric iron for coagulation and sedimentation treatment, the effective residence time is 10 hours, the coagulation The effluent from the settling tank is sent to the air flotation tank for treatment, the reflux ratio is controlled to be 0.4, and the dissolved air pressure is 4 atmospheres. The water treated in the air flotation tank enters the first-stage single-layer quartz sand filter, maintaining a filtration rate of 6 m / h, a backwash intensity of 14 liters / second·square meter, a backwash cycle of 40 hours, and a backwash time of 20 minutes. The effluent from the first-level single-layer quartz sand filter enters the second-level single-layer quartz sand filter for filtration, the filtration rate is 5 m / h, the backwash intensity is 14 liters / second·square meter, the b...

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Abstract

A process for demineralizing the sewage in oil field, which contains oil, polymers and high-mineralized water, includes such steps as coagulating, deposition, air floating, filtering, chemical cleaning in a circulating membrane unit for further treating, demineralizing in a nano-modified ion exchange unit, desalting, and using the treated water to prepare polymer for reusing it.

Description

technical field [0001] The invention belongs to a water treatment method, in particular to a method for reducing the salinity of oil field sewage. Background technique [0002] With the development of oil displacement technology, the development of most oilfields in my country has gradually entered a mature stage, followed by a large increase in oilfield produced water, from 10-20% in the early stage of exploitation to 80-90% now, and At the same time, people are paying more and more attention to environmental protection, so that the produced water cannot be discharged at will; on the other hand, in order to tap the potential of oil reservoirs, various oil fields have begun to apply multi-component polymer flooding production technology, and the preparation of these agents requires a lot of low-cost Mineralized clear water. [0003] At present, the existing treatment method for reducing the salinity of oil field wastewater is to use pretreatment plus reverse osmosis. Pretrea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
Inventor 于水利荆国林镇祥华王北福
Owner HARBIN INST OF TECH
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