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Process for treating sewage of oil field

A treatment method and technology for oilfield sewage, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. environment and other problems, to achieve the effect of facilitating loading and pulling problems, speeding up settling speed, oil removal efficiency and quality improvement

Active Publication Date: 2007-10-17
ANTON OILFIELD SERVICES (GRP) LTD
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0010] 2. The settled sludge after sewage treatment has high water content and cannot be treated, seriously polluting the environment
In the process of oilfield sewage treatment, roughly every 1000m 3 In sewage, 1.0-1.5m 3 / 1000m 3 Sludge, the water content of the sludge treated by the press plate machine is 92%, which makes transportation and treatment difficult

Method used

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  • Process for treating sewage of oil field
  • Process for treating sewage of oil field
  • Process for treating sewage of oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The air flotation degreasing process is adopted to replace the current natural gravity degreasing method of vertical large tank and inclined plate.

[0055] Daily processing capacity 20000m 3 / d's oilfield sewage treatment station. The volume of the large tank that separates and removes oil by natural gravity is 5000m 3 Two buildings, covering an area of ​​4545.5m 2 ×2 is 909m 2 , so that the crude oil content of incoming water is 750mg / L, and the oil content after treatment is reduced to 30-50mg / L. Under the same treatment capacity, the air flotation method is used to remove oil, and the induced air flotation method is adopted. The equipment is the YTF induced air flotation machine produced by Yangzhou Chenglu Environmental Engineering Co., Ltd. The equipment uses air stirring to drive water and air flotation. No need to add air flotation agent, the volume of the device is 100m 3 ×2 is 200m 3 , covers an area of ​​20m 2 ×2 is 40m 2 , After air flotation and oil...

Embodiment 2

[0057] The method of adding ion modifier is used to remove harmful components in oilfield sewage, which not only alleviates the metal corrosion of the water injection system, but also ensures the compliance rate of the injection water quality, and improves the compatibility of the treated sewage and the reservoir water.

[0058] The metal corrosion rate of sewage to tanks, pipes, pumps and wells is 0.5-1mm / a, which is 6.5-13 times higher than the national standard of 0.076mm / a. The PH value of the injected water is slightly acidic and the formation is not compatible, resulting in clogging of the oil layer; the treated sewage is mixed and the particle diameter exceeds the standard.

[0059] Modification of oilfield sewage by adding ion modifier:

[0060] Process operation: After degreasing the sewage, add the compound alkali before entering the mixer, so that the concentration of the compound alkali in the water is 300-500mg / L, and the compound alkali is composed of NaOH and Ca...

Embodiment 3

[0063] Before entering the settling tank, in addition to adding flocculant, iron powder is also added. The particle size of iron powder is 40-500nm, so that the concentration of iron powder in the water is 70-100mg / L, so that the agglomerated suspended solids and mechanical impurities are mixed into Iron powder increases the quality of the agglomerates and greatly speeds up the settling speed. After practical application in the oil field, the daily processing capacity is 20,000m 3 The volume of the settling tank with / d capacity is only 5000m 3 One-tenth of the settling tank. The settling speed of suspended solids and impurities is shortened from 8 to 12 hours in the original process to 1 hour. Settling efficiency increased by 7-13 times. This is equal to the volume of the sewage settling tank can be reduced by 7 to 13 times under the scale of processing the same amount of sewage. The manufacturing cost and floor area of ​​the device are saved.

[0064] In this method, in...

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Abstract

A oil field sewage disposal method comprises following steps: 1. Air Floating Degrease process comprises: supplying air or natural gas to oiliness sewage to generate gas bubbles in water, disperse oil droplets stick on bubbles and float with gas on water surface to recovery; 2. Ionic adjustment process: the water purified through step 1 enter into a mixer, adding chemical agent in the mixer to remove harmful substance; 3. quickly settling process: sending the sewage processed through step to a mixing tank through a pump, adding coagulant and ferrous powder the tank, settling in the settling tank; 4. sending clean water of the settling tank to a filter process to get clean water; 5. sending settled mud to a mud centrifugal dehydration process. The invention has advantages of a little apparatus occupation area, high deoiling efficiency and high quality, the corrosion speed of sewage is reduced by 1.5mm / a before modified to 0.076mm / a; rapid settling speed; long back flushing time-interval, short back flushing time; water containing of mud fell to below 70%.

Description

technical field [0001] The invention relates to a treatment method for oil field sewage. Background technique [0002] More than 90% of my country's developed oilfields belong to water injection development. The current comprehensive water content of oilfields has reached 89%, and the daily sewage production is 4 million m 3 , plus the daily well washing water, drilling, operation, mechanical cooling equipment, site cleaning water, etc. is estimated to be 5 million m 3 / d or so. [0003] Whether the sewage generated in the oilfield is used for discharge or used as oilfield injection water, it needs to be treated first. The country has 5000m 3 / d-30000m 3 There are about 300 sewage stations with / d treatment capacity, and these sewage treatment stations are basically running continuously for 24 hours. [0004] The current oilfield sewage treatment methods include: gravity sewage treatment method, pressure sewage treatment method and flotation sewage treatment method, in ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F1/40C02F1/52
Inventor 王法轩潘卫国乔国发
Owner ANTON OILFIELD SERVICES (GRP) LTD
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