Reduced-injection standardized discharge method for high-sulfur wastewater in oil and gas fields

A high-sulfur, oil and gas field technology, applied in chemical instruments and methods, degassed water/sewage treatment, water/sewage treatment, etc., can solve the problems of high suspended solids content and oil content, reducing the amount of wastewater reinjection, etc. To achieve the effect of easy operation and maintenance, shorten the time of wastewater desulfurization, and high desulfurization efficiency

Active Publication Date: 2017-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for reducing injection and meeting the standard discharge of high-sulfur wastewater from oil and gas fields, which adopts negative pressure desulfurization + chemical reaction desulfurization + flocculation sedimentation + ceramic membrane filtration + high-efficiency electrodialysis + Ozone catalytic oxidation technology, after the high-sulfur wastewater from oil and gas fields is treated, can effectively remove sulfide, suspended solids, organic matter, chloride and oil in the wastewater, and solve the problem of sulfur content, suspended solids and The problem of excessive oil content, combined with subsequent treatment technology, removes organic matter and chloride in wastewater, effectively reduces the amount of wastewater reinjection, and realizes the discharge of high-sulfur wastewater from oil and gas fields up to standard

Method used

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  • Reduced-injection standardized discharge method for high-sulfur wastewater in oil and gas fields

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Experimental program
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Effect test

Embodiment 1

[0091] The main water quality characteristics of high-sulfur wastewater from oil and gas fields are: sulfide 2000mg / L, total dissolved solids 10000mg / L, suspended solids 500mg / L, oil 100mg / L, total hardness (CaCO 3 Total) 1000mg / L, Na + 5000mg / L, Cl - 6000mg / L, SO 4 2- 1000mg / L, COD 800mg / L.

[0092] The processing steps are as follows:

[0093] In the first step, the high-sulfur wastewater uses sulfuric acid to adjust the pH of the wastewater to 6 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. The operating conditions of negative pressure desulfurization are: inlet water temperature 35°C, operating negative pressure -0.04MPa, The wastewater residence time is 20 minutes, and the reflux ratio of the circulating pump is 5:1;

[0094] In the second step, the negative pressure desulfurization effluent uses sulfuric acid to adjust the pH of the wastewater to 6.5 for the second time, and then enters the chemical reaction desu...

Embodiment 2

[0103] The main water quality characteristics of high-sulfur wastewater from oil and gas fields are: sulfide 5000mg / L, total dissolved solids 20000mg / L, suspended matter content 1500mg / L, oil content 150mg / L, total hardness (CaCO 3 Total) 1100mg / L, Na + 8000mg / L, Cl - 9000mg / L, SO 4 2- 1300mg / L, COD 1000mg / L.

[0104] The processing steps are as follows:

[0105] In the first step, the high-sulfur wastewater uses hydrochloric acid to adjust the pH of the wastewater to 4.8 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. The operating conditions for negative pressure desulfurization are: inlet water temperature 40°C, operating negative pressure -0.05MPa, The wastewater residence time is 27min, and the reflux ratio of the circulating pump is 4:1;

[0106] In the second step, the pH of the negative pressure desulfurization water is 5.5, so there is no need to adjust the pH twice, and it directly enters the chemical reaction ...

Embodiment 3

[0115] The main water quality characteristics of high-sulfur wastewater from oil and gas fields are: sulfide 10000mg / L, total dissolved solids 30000mg / L, suspended matter content 3000mg / L, oil content 200mg / L, total hardness (CaCO 3 Total) 1200mg / L, Na + 10000mg / L, Cl - 11000mg / L, SO 4 2- 1400mg / L, COD 1200mg / L.

[0116] The processing steps are as follows:

[0117] In the first step, the high-sulfur wastewater uses nitric acid to adjust the pH of the wastewater to 5 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. The operating conditions of negative pressure desulfurization are: inlet water temperature 45°C, operating negative pressure -0.06MPa, The wastewater residence time is 30min, and the reflux ratio of the circulating pump is 3:1;

[0118] In the second step, the pH of the negative pressure desulfurization water is 5.7, so there is no need to adjust the pH twice, and it directly enters the chemical reaction desulf...

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Abstract

The invention relates to a reduced-injection standardized discharge method for high-sulfur wastewater in oil and gas fields. The method includes the following steps: 1) removing majority of H2S in the high-sulfur wastewater through negative pressure desulfurization; 2) performing chemical reaction to residual H2S in the water generated through the negative pressure desulfurization to form precipitates; 3) performing flocculating settlement to the water generated through the chemical reaction desulfurization; 4) filtering the water generated by the flocculating settlement through a ceramic membrane filtration unit; 5) separating and concentrating the water generated through the ceramic membrane filtration in a high-effective electro-dialysis unit; and 6) performing ozone catalytic oxidization to the fresh water generated through the high-effective electro-dialysis, and discharging the water, which meets the standards, after the ozone catalytic oxidization. By means of the reduced-injection standardized discharge method, sulfides, suspension solids, organic matters, chlorides and oil in the high-sulfur wastewater are deeply removed, and the sulfur content, suspension solid content and oil content of eletro-dialyzed concentrated water satisfy standard of reinjection water of oil and gas fields. The water outputted after the ozone catalytic oxidization meets the standard and is discharged.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a method for reducing injection and meeting standards for high-sulfur waste water from oil and gas fields. In particular, it refers to the method of using negative pressure desulfurization + chemical reaction desulfurization + flocculation sedimentation + ceramic membrane filtration + high-efficiency electrodialysis + ozone catalytic oxidation technology to treat high-sulfur wastewater from oil and gas fields by reducing injection and meeting standards. Background technique [0002] With the development of social economy and the continuous improvement of people's living standards, the demand for energy is increasing day by day, and the extraction volume of oil and gas fields is increasing year by year. In the development of oil and gas fields, especially in the middle and later stages of oil and gas field development, because formation water can invade gas reservoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/20C02F1/44C02F1/4693C02F1/52C02F1/72C02F1/725C02F9/00
Inventor 栾金义章晨林张新妙彭海珠侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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