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Method and technological process for treating sewage of oil recovery

A technology of oil production sewage and treatment method, which is applied in the field of petroleum sewage treatment, can solve problems such as corrosion and scaling, affect oil recovery rate, etc., and achieve the effect of solving corrosion and scaling and realizing resource utilization

Inactive Publication Date: 2008-05-07
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This treatment technology cannot fundamentally solve the problem of reinjection water quality compliance for oil extraction wastewater with high sulfur content, high bacterial content, and high salinity
The treated water will still produce severe corrosion and scaling, affecting oil recovery

Method used

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  • Method and technological process for treating sewage of oil recovery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Treatment of oil production wastewater with high sulfur content and high bacterial content

[0027] 1. Before the oil extraction wastewater from crude oil enters the sulfur removal flocculation reactor, the oxidant hydrogen peroxide 440-460 mg / L is first added through the pipeline mixer to partially oxidize the sulfide in the sewage, and then zinc is added into the reaction tank through the pipeline mixer Salt such as zinc sulfate 60mg / L, to precipitate and remove the remaining divalent sulfur in the sewage.

[0028] 2. Add 8 million units of polyacrylamide 1.0 mg / L flocculant to the oil production sewage after desulfurization treatment through the pipeline mixer to flocculate the sediment, oil and other substances in the sewage.

[0029] 3. After the flocculation treatment, the oil production sewage is sterilized by adding 60mg / L fungicide glutaraldehyde or isothiazolinone through the pipeline mixer, and at the same time, it is settled and separated in the s...

example 2

[0037] Example 2 provides a treatment method for low-turbidity sulfur-containing oil production wastewater.

[0038] 1. Before the oil production sewage from crude oil enters the sulfur removal flocculation reactor, first add oxidant sodium hypochlorite 30-40 mg / L through the pipeline mixer to partially oxidize the sulfide in the sewage, and then add zinc into the reaction tank through the pipeline mixer Salt such as zinc sulfate heptahydrate 50mg / L, or add iron salts, such as ferric sulfate, ferric chloride, polyferric sulfate 50mg / L, to precipitate and remove the remaining divalent sulfur in the sewage.

[0039] 2. Add 8 million units of polyacrylamide 1.0 mg / L flocculant to the oil production sewage after desulfurization treatment through the pipeline mixer to flocculate the sediment, oil and other substances in the sewage.

[0040] 3. After the flocculation treatment, the oil production sewage is sterilized by adding 50 mg / L bactericide dodecyldimethylbenzyl ammonium chlor...

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Abstract

The invention belongs to a petroleum sewage treatment method, in particular relates to an oil pumping in oil filed sewage treatment method and the process flow thereof. The invention is characterized in that the oil pumping sewage from the rude oil is firstly added with oxidizer so as to partially oxidize the sulfide in the sewage, and then is added with precipitant so as to remove the settlementof rest secondary sulfide in the sewage; organic high polymer flocculant is added inside the sewage to flocculate the substances such as sediment and oil inside the sewage; disinfectant is added inside for disinfection and for settlement separation; the sewage is rough filtered and then finely filtered so as to reach the quality standard of pouring water; the filtered water is photoelectrically sterilized, and then anti-sludge inhibitor is added into water for accomplishing anti-sludge inhibition after being photoelectrically sterilized and before entering into a clean water pot; and the water inside the clean water pot is used for back pouring. The invention solves the high sulfur content, high germ content and high mineralization oil pumping sewage treatment problem, and reaches the quality standard of back pouring water for low permeable oil filed, thereby protecting the environment and saving the water resource.

Description

technical field [0001] The invention belongs to a method for treating petroleum sewage, in particular to a method and process flow for treating oilfield sewage. Background technique [0002] In the middle and late stages of oilfield exploitation, in order to increase oil production, oil wells often need to inject a large amount of water. Except for a small part of the oil production wastewater that meets the discharge standard, most of it needs to be purified, sterilized, and antiseptic treated to meet the reinjection water standard before reinjection Formation, reinjection water quality is directly related to the oil recovery rate, the treatment of oil production sewage and whether the reinjection water quality can meet the standard after treatment becomes very important. [0003] The oil production sewage extracted from crude oil contains dispersed crude oil, emulsified crude oil, suspended solids, bacteria and sulfides. In the existing oilfield sewage treatment, although ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/72C02F1/56C02F1/30C02F1/48C02F103/10
Inventor 杨志刚刘立郭亮李世勇
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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