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Treatment method for oil field acidic sewage

A technology of acid sewage and treatment method, applied in the field of oilfield sewage treatment, can solve the problems of slow speed, use of chemical agents, and high cost, and achieve the effects of reducing the tendency of sewage to scale, inhibiting the growth of anaerobic bacteria, and controlling the content of active oxygen.

Inactive Publication Date: 2015-12-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also has problems such as serious fouling of equipment, and high investment, slow speed and low efficiency
To sum up, in order to improve the pH value of oilfield acidic sewage, the shortcomings of the existing technology are mainly the use of chemical agents, high energy consumption, and high cost, especially in the slow speed of increasing the pH value of sewage. In practical applications, it is inevitable to produce equipment Scaling and other problems

Method used

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  • Treatment method for oil field acidic sewage
  • Treatment method for oil field acidic sewage
  • Treatment method for oil field acidic sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, the air or nitrogen and the acidic sewage from the oilfield flow together through the tubular static mixer for gas-liquid mixing, and the gas-liquid volume ratio is controlled to be 3.0 at 55°C. The time for passing through the tubular static mixer is 2 seconds, and the pH value is increased to 7.0, and then through the gas-liquid cyclone separation, the sewage desorbed from the acid gas is sent to the flocculation and sedimentation process, and finally the water from the flocculation and sedimentation to separate the sediment is discharged. The gas-liquid dispersion is less than 0.5 mm; the Reynolds number of the gas-liquid mixed flow state is greater than 3000.

[0043] In this embodiment, the method of the present invention is used to carry out rapid and efficient gas-liquid mixing for the oilfield acid sewage obtained through the three-phase separator, after the first oil removal tank, the sewage oil content is low. Use a compressor to press the air into the ...

Embodiment 2

[0050]First, the air or nitrogen and the acidic sewage from the oilfield flow together through the tubular static mixer for gas-liquid mixing, and the gas-liquid volume ratio is controlled at 65°C to be 2.5. The time for passing through the tubular static mixer is 5 seconds, and the pH value is increased to 7.5, then through the gas-liquid cyclone separation, the sewage desorbed from the acid gas is sent to the flocculation and sedimentation process, and finally the water from the flocculation and sedimentation to separate the sediment is discharged. The gas-liquid dispersion is less than 0.5 mm; the Reynolds number of the gas-liquid mixed flow state is greater than 3000.

[0051] In this embodiment, the method of the present invention is used for rapid and efficient gas-liquid mixing in the case where the oilfield acid sewage obtained through the three-phase separator has a high oil content before the primary oil removal tank. At this time, the sewage has a higher oil content...

Embodiment 3

[0057] First, the air or nitrogen and the acidic sewage from the oilfield flow together through the tubular static mixer for gas-liquid mixing, and the gas-liquid volume ratio is controlled at 58°C to be 2.8. The time for passing through the tubular static mixer is 4 seconds, and the pH value is increased to 7.1, then through the gas-liquid cyclone separation, the sewage that desorbs the acid gas is sent to the flocculation and sedimentation process, and finally the water from the flocculation and sedimentation to separate the sediment is discharged. The gas-liquid dispersion is less than 0.5 mm; the Reynolds number of the gas-liquid mixed flow state is greater than 3000.

[0058] In this example, the oil field acid sewage contains CO 2 and H 2 S, and in the case of a lower pH value, the method of the present invention is used to carry out rapid and efficient gas-liquid mixing before the primary oil removal tank. Use a compressor to press the air into the SV-type static mixe...

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Abstract

The invention discloses a treatment method for oil field acidic sewage. The method is characterized by comprising the steps that firstly, air or nitrogen and oil field acidic sewage form parallel flow for gas-liquid mixing through a tubular static mixer, the gas-liquid volume ratio is controlled to be 2.5-3.0 at the temperature of 55-65 DEG C, the gas-liquid dispersion degree is smaller than 0.5 mm, and the time spent by the parallel flow in passing through the tubular static mixer is 2-5 seconds, the Reynolds number of the gas-liquid mixed flowing state is larger than 3000, then, sewage with acidic gas desorbed through gas-liquid hydrocyclone separation is fed into the flocculation and sedimentation procedures, and finally water with sediments separated out through flocculation and settlement is drained out. The method is adopted for treating the oil field acidic sewage, and the pH value of the sewage can be increased from 5.5-7.0 to 7.0-7.5. Meanwhile, the sewage corrosion rate can be controlled within 0.02 mm / a. According to the method, no alkaline chemical agent is added; the rapid and efficient gas-liquid mixing method is adopted, so that the equipment scaling possibility is effectively decreased. The method is used before flocculation and settlement of oil field sewage, can remarkably improve the flocculation and settlement effect and can effectively lower the dosage of a flocculant.

Description

Technical field: [0001] The invention relates to a technical method for rapidly increasing the pH value of oilfield acid sewage, and belongs to the field of oilfield sewage treatment. technical background: [0002] When oilfield wastewater contains CO 2 When such acid gas is present, the sewage is often acidic and highly corrosive. At the same time, in the process of sewage treatment, due to the existence of acid gas, acid gas overflow occurs continuously, which makes the pH value of sewage continuously increase and change. The acid gas overflow process in sewage is often uncontrolled. When the sewage has a high salt content and has a tendency to scale, it will lead to excessive suspended solids in the subsequent export process. Therefore, as oilfield acid wastewater used for reinjection after treatment, there are often two outstanding problems of corrosion and suspended solids exceeding the standard. A large number of studies have shown that the corrosiveness of acidic s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/20C02F1/66
Inventor 武继辉刘雨文赵如松陈伟高俊斌陈绍维慕朝贾鹏佟拉嘎纪超
Owner CHINA PETROLEUM & CHEM CORP
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