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

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...

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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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