Method for resource recycling treatment on produced water of high-sulfur gas field

Abstract

The invention belongs to the technical field of oil and gas field ground engineering and provides a method for treating produced water of a high-sulfur gas field. The method comprises closed sulfur removal treatment, mechanical agitation clarification treatment, pressure filtration treatment, evaporation treatment, advanced oxidation treatment, microfiltration / ultrafiltration membrane treatment and reverse osmosis membrane treatment. The method can specifically remove sulfides, suspended solids, scale ions, COD, volatile phenol and ammonia nitrogen in water and conductivity. The method has strong water quality fluctuation adaptability to produced water of a high-sulfur gas field, a low agent use amount and a low steam use amount. The qualified produced water of a high-sulfur gas field canbe fully used as make-up water for the circulating cooling water of the purification plant and realize the zero emission of the produced water in the gas field.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field surface engineering, and in particular relates to a processing method suitable for producing water from a high-sulfur gas field. Background technique [0002] The produced water produced in the production process of high-sulfur gas fields has a high concentration of sulfides (generally produced water [0003] ≤2000mg / L~3000mg / L), high salinity, high chemical oxygen demand (that is, COD, COD concentration is generally 1000mg / L~12000mg / L, the range fluctuates greatly), and high hardness and other water quality characteristics. The COD components are complex, including volatile phenol, aniline, naphthalene and dipentaerythritol. The overall biodegradability of this kind of produced water is poor, and the BOD / COD ratio is only about 0.1 (BOD is biochemical oxygen demand). The main components of COD in the produced water of the above-mentioned high-sulfur gas fields are shown in Table 1. ...

AI Technical Summary

Problems solved by technology

The reinjection process has the risk of polluting groundwater

[0007] At present, the high-sulfur gas fields that have been developed and put into production in my country mainly include Puguang Gas Field and Yuanba Gas Field. These two gas fields are mainly distributed in the Sichuan area. With the introduction of more stringent environmental protection policies, the concept of "lucid water and green mountains are golden mountains and silver mountains" has been deeply rooted in the hearts of the people. The existing treatment and reinjection mode for the produced water of high-sulfur gas fields is no longer suitable for the environmental protection requirements under the current national conditions.

[0008] At present, there is no actual project in China that has been completed and put into operation for the reuse of produced water from high-sulfur gas fields.

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