Process method for treating refractory CODs (chemical oxygen demands) in produced water of high-sulfur-content gas field

Abstract

The invention belongs to the technical field of ground engineering of oil and gas fields and in particular relates to a process for removing refractory CODs (chemical oxygen demands) in produced waterof a high-sulfur-content gas field. Aiming at situations that refractory COD components in produced water of a high-sulfur-content gas field and CODs in fed water after pretreatment are generally 1000mg / L and are refractory CODs, and to achieve resource recycling of the produced water of the high-sulfur-content gas field, the invention discloses the process applicable to removal of refractory CODs in produced water of the high-sulfur-content gas field, a treatment process of "Fenton oxidation+ozone ultraviolet photocatalytic oxidation+micro / ultrafiltration membrane+reverse osmosis membrane" is adopted, and organic components such as refractory CODs and volatile phenols in the produced water of the high-sulfur-content gas field can be degraded and removed. In a situation that the CODs of produced water are less than or equal to 1000mg / L, the process is adopted for treatment, and CODs of an effluent after treatment qualification are less than or equal to 50mg / L.

Description

technical field [0001] The invention belongs to the technical field of surface engineering of oil and gas fields, and in particular relates to a process for removing refractory COD in produced water of high-sulfur gas fields. Background technique [0002] At present, the high-sulfur gas fields that have been developed and put into production in China mainly include Puguang Gas Field and Yuanba Gas Field. The high-sulfur gas field produced water produced in the production process of the gas field comes from different formations and is mixed with the corrosion inhibitor added in the gas field production process during the transportation process, resulting in complex COD components and many refractory components in the gas field water. Through GC- MS analysis of COD components in high-sulfur gas field water, see Table 1 for details. [0003] Table 1: COD main components of gas field produced water [0004] [0005] [0006] Judging from the composition of the COD mentio...

AI Technical Summary

Problems solved by technology

The population density in this area is high, and the reinjection capacity of reinjection wells is poor. The most important thing is that with the introduction of more stringent environmental protection policies in the country, the concept of "lucid water and green mountains are golden mountains and silver mountains" has been deeply rooted in the hearts of the people, and the water produced by high-sulfur gas fields The existing treatment and reinjection mode is no longer suitable for the environmental protection requirements under the current national conditions

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