Two-stage treatment method for offshore platform production wastewater

Abstract

The invention provides a two-stage treatment method for production wastewater, which includes the following steps: 1) reducing the pressure of the production wastewater, which is separated through a production separator, through an air floatation inlet ejector, and feeding the production wastewater into a rotational flow air floatation device for separation; 2) continuously discharging a continuous oil, bubble and scum layer, which is formed on the upper part in water in a pot body of the rotational flow air floatation device, into a sewage oil pot through a short pipe which is hung on the top and stretched into the pot, alleviating the separated water flow through a horizontal circular board in the middle-lower part, discharging the water through a water outlet, and feeding the water into a dual-medium filter through pressurization in a filter material feeding pump; and 3) when the treated water reaches a water injection standard, feeding the water into a degassing pot to mix the water with well water from a water source to perform reinjection, wherein back-wash water from the dual-medium filter is fed into the sewage oil pot. The two-stage treatment method has quick separation, good filter effects, strong sewage blocking capability, is stable in operation, is short in back-wash time and is complete in the back-wash, and is compact in equipment structure.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a two-stage treatment process for petrochemical production sewage. Background technique [0002] The production sewage of offshore oil production platforms is mainly the formation water produced with crude oil from the formation. At present, the water content in the production fluid of oil production platforms is increasing day by day. The increase also makes the processing cost increasing day by day. There are two main ways to treat production sewage at present, one is to discharge the waste into the sea after the treatment reaches the standard; the other is to re-inject the production water into the formation after the production water treatment reaches the re-injection water index in the oil reservoirs that need water injection development, and the re-injection method is both It can make full use of sewage, increase crude oil production, and avoid environ...

AI Technical Summary

Problems solved by technology

However, in the prior art, the treatment and separation of production sewage takes a long time, and the filtering effect is poor; and the processing equipment is huge and needs to occupy a large space; in addition, due to the heavy equipment, it is very difficult to arrange on the offshore oil production platform; the economy is poor, so it cannot Successfully meet the re-injection requirements

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