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Method for treating foam drainage gas recovery wastewater

A gas extraction wastewater and foam drainage technology, which is applied in water/sewage treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc., can solve the difficulties of foam drainage treatment, high equipment and maintenance costs, and potential safety hazards Avoiding equipment corrosion and safety issues, reducing types and dosage, and stabilizing the evaporation process

Inactive Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the treatment of bubble drainage is very difficult. Patent application CN104773893A discloses the process of "Fenton oxidation + coagulation + stripping + decompression evaporation" to treat bubble drainage. The treatment process needs to add various oxidants, catalysts, flocculants and coagulation aids. agent, and the pH value needs to be adjusted several times during the whole process, the operation is complicated
In addition, the Fenton oxidation reaction needs to be carried out in a strong acid environment, the cost of equipment and maintenance is high, and there are potential safety hazards
At present, there is no simple and effective process for treating bubble drainage under neutral or near neutral conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment is used to illustrate the treatment method of foam drainage and gas extraction wastewater of the present invention.

[0052] Basic situation of the wastewater to be treated: The wastewater is the foam drainage produced by the foam gas recovery process (with dodecyl dimethyl betaine added) in a gas field in Southwest China. The COD is 13521mg / L, the pH value is 6.7, and the suspended solids content is 91287mg / L, the content of ammonia nitrogen is 210mg / L, the content of chloride ion is 13089mg / L, the content of betaine is 0.3mmol / L, the color is yellow, with hydrocarbon smell.

[0053] (1) Add 800ppm of aluminum chloride and 5ppm of polyacrylamide (purchased from BASF, Germany, BASF, model Zetag 8165, the same below) to the soaked drainage, adjust the pH value to 7.2, stir, soaked and drained to quickly produce a large amount of yellow flocs body, the flocs precipitated rapidly. The solution is layered, the upper layer is a transparent solution, the low...

Embodiment 2

[0059] This embodiment is used to illustrate the treatment method of foam drainage and gas extraction wastewater of the present invention.

[0060] The basic situation of the wastewater to be treated: the wastewater is the foam drainage produced by the foam gas recovery process (adding dodecyl dimethyl betaine) in a gas field in Southwest China. The COD is 13580mg / L, the pH value is 6.7, and the suspended solid content is 92246mg / L, the content of ammonia nitrogen is 200mg / L, the content of chloride ion is 13103mg / L, the content of betaine is 0.33mmol / L, the color is yellow, with hydrocarbon odor.

[0061] (1) Add 500ppm of aluminum chloride and 10ppm of polyacrylamide to the bubble drainage, adjust the pH value to 7, stir, the bubble drainage quickly produces a large number of yellow flocs, and the flocs precipitate rapidly. The solution is layered, the upper layer is a transparent solution, and the lower layer is a yellow coagulated sediment, and the supernatant is obtained...

Embodiment 3

[0067] This embodiment is used to illustrate the treatment method of foam drainage and gas extraction wastewater of the present invention.

[0068] The basic situation of the wastewater to be treated: the wastewater is the foam drainage produced by the foam gas recovery process (adding dodecyl dimethyl betaine) in a gas field in Southwest China. The COD is 13542mg / L, the pH value is 6.7, and the suspended solids content is 102182mg / L, the content of ammonia nitrogen is 200mg / L, the content of chloride ion is 13129mg / L, the content of betaine is 0.31mmol / L, the color is yellow, with hydrocarbon smell.

[0069] (1) Add 1000ppm of aluminum chloride and 3ppm of polyacrylamide to the bubble drainage, adjust the pH value to 7.5, stir, the bubble drainage quickly produces a large number of yellow flocs, and the flocs precipitate rapidly. The solution is layered, the upper layer is a transparent solution, and the lower layer is a yellow coagulated sediment, and the supernatant is obt...

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PUM

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Abstract

The invention relates to the technical field of wastewater treatment, and discloses a method for treating foam drainage gas recovery wastewater. The method includes the steps that 1, the foam drainagegas recovery wastewater is subjected to coagulating sedimentation treatment, so that supernate is obtained; 2, the supernate is oxidized to remove ammonia nitrogen in the wastewater; 3, the wastewater obtained in the second step is subjected to heating sedimentation treatment so as to remove a surface active agent in the wastewater; 4, a system obtained in the third step is subjected to evaporation treatment. In the method, operation conditions are neutral or approximate to be neutral (without strong acid conditions and strong base conditions), a technology is simple, costs are low, and the application range is wide; after treatment, water can be purified substantially, and the problem is effectively solved that the foam drainage gas recovery wastewater is difficult to treat.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for foam drainage and gas extraction wastewater. Background technique [0002] In the middle and late stages of gas field development, formation pressure decreases, edge and bottom water advance, and operations such as fracturing and acidification are implemented, resulting in fluid accumulation at the bottom of the well and in the wellbore, reducing natural gas production or even shutting down due to water flooding. People use various methods to eliminate bottom well fluid, among which the foam drainage method is widely used because of its low cost, quick return, easy construction and no impact on gas well production. The foam-assisted drainage gas recovery method is to inject a certain amount of foam-drainage aid into the gas well, and after the bottom-hole liquid is in contact with the foam-drainage aid, a large amount of low-density water-conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/02C02F1/048C02F1/5236C02F1/72
Inventor 杨宇宁江建林
Owner CHINA PETROLEUM & CHEM CORP
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