Deep desulphurization method of high sulfur-containing waste water from oil and gas field

A technology with deep desulfurization and high sulfur content, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of chemical consumption, large amount of waste residue, large amount of residue and efficiency Low-level problems, to achieve the effect of strong environmental adaptability, high desulfurization efficiency, and simple technical equipment

Inactive Publication Date: 2016-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the three methods, the physical method is the simplest. Due to the chemical reaction, the chemical method consumes a lot of chemicals and waste residue when the sulfur content of the wastewater is high, so it is not suitable for treating wastewater with a high sulfur content; Oxidation and removal of sulfide, due to the limitation of microbial tolerance, the efficiency of treating wastewater with high sulfur content is low, so it is not suitable for treating wastewater with high sulfur content
Chinese patent 201110273016.6 relates to a treatment method for sulfur-containing wastewater in oil and gas fields. This patent mainly removes sulfur in the wastewater by adding a pH regulator and a desulfurizer to carry out a chemical reaction. The desulfurizer uses ferrous sulfate. Due to this chemical reaction produces The amount of slag is large, so the method of this patent is only suitable for treating wastewater with low sulfur content. The patent clearly limits the sulfur content of the influent to ≤3000mg / L

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  • Deep desulphurization method of high sulfur-containing waste water from oil and gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The main water quality characteristics of the high-sulfur wastewater of oil and gas fields treated in this example are: 2,000 mg / L of sulfide, 10,000 mg / L of total dissolved solids, and 500 mg / L of suspended solids.

[0041] The deep desulfurization method of the high-sulfur wastewater in the oil and gas field of this implementation is as follows: first, after the pH of the high-sulfur wastewater is adjusted to 6 with sulfuric acid, it is transported to the negative pressure desulfurization unit for desulfurization, and the operating conditions of the negative pressure desulfurization are: the inlet water temperature 35℃, operating negative pressure -0.04MPa, wastewater residence time is 20min, and the reflux ratio of the circulating pump is 5:1; secondly, the pH of the negative pressure desulfurization effluent is adjusted to 6.5 with sulfuric acid, and then sent to the chemical desulfurization unit for chemical desulfurization , among them, the chemical reactant is fer...

Embodiment 2

[0044] The main water quality characteristics of the high-sulfur wastewater of oil and gas fields treated in this example are: 5,000 mg / L of sulfide, 20,000 mg / L of total dissolved solids, and 1,500 mg / L of suspended solids.

[0045] The deep desulfurization method of the high-sulfur wastewater of oil and gas fields of the present invention is as follows: firstly, after the pH value of the high-sulfur wastewater is adjusted to 4.8 with hydrochloric acid, it is transported to the negative pressure desulfurization unit for desulfurization; the operating conditions of the negative pressure desulfurization: the temperature of the influent water It is 40℃, the operating negative pressure is -0.05MPa, the residence time of the wastewater is 27min, and the reflux ratio of the circulating pump is 4:1; secondly, the pH value of the negative pressure desulfurization effluent is adjusted to 5.5 with sulfuric acid, and then sent to the chemical desulfurization The unit carries out chemical...

Embodiment 3

[0048] The main water quality characteristics of the high-sulfur wastewater of oil and gas fields treated in this example are: 10,000 mg / L of sulfide, 30,000 mg / L of total dissolved solids, and 3,000 mg / L of suspended solids.

[0049] The deep desulfurization method of the high-sulfur wastewater of oil and gas fields of the present invention is as follows: firstly, after the pH value of the high-sulfur wastewater is adjusted to 5 with hydrochloric acid, it is transported to a negative pressure desulfurization unit for desulfurization; the operating conditions of the negative pressure desulfurization: the inlet water temperature It is 45 ℃, the operating negative pressure is -0.06MPa, the residence time of the wastewater is 30min, and the reflux ratio of the circulating pump is 3:1; secondly, the pH value of the negative pressure desulfurization effluent is adjusted to 5.7 with sulfuric acid, and then sent to the chemical desulfurization The unit carries out chemical desulfuriza...

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Abstract

The invention relates to the field of industrial waste water processing, and concretely relates to a deep desulphurization method of high sulfur-containing waste water from oil and gas field. The deep desulphurization method comprises the following steps: removing most hydrogen sulfide in waste water by employing a negative-pressure desulphurization technology for burning the hydrogen sulfide; forming precipitate on the residual hydrogen sulfide in a negative-pressure desulphurization effluent obtained by employing a chemical catalytic oxidation technology through a chemical reaction, removing the precipitate; and finally deeply removing sulfide in the high sulfur-containing waste water from oil and gas field. The deep desulphurization method can effectively remove the sulfide in the waste water, the problem of overhigh sulfur content during a high sulfur-containing waste water re-injection process of the oil and gas field is solved, and the disadvantages of large equipment, complex process, low efficiency, poor environment adaptability, high operation cost and difficult maintenance in the current processing technology can be solved.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for deep desulfurization of high-sulfur wastewater in oil and gas fields, in particular to a method for deep desulfurization of high-sulfur wastewater from oil and gas fields using negative pressure desulfurization + chemical reaction desulfurization technology. Background technique [0002] With the social and economic development and the continuous improvement of people's living standards, the demand for energy is increasing day by day, and the exploitation of oil and gas fields is increasing year by year. In the development of oil and gas fields, especially in the middle and late stages of oil and gas field development, because the formation water can invade the gas reservoir along faults and structural fissures and enter the bottom of the well, the energy loss of the gas reservoir increases, the wellhead pressure decreases, and the water-carryi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 张新妙栾金义彭海珠万国晖
Owner CHINA PETROLEUM & CHEM CORP
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