Aggregation sinking and emerging treatment device for oilfield produced waste water

Abstract

The invention relates to a conglomeration and flotation-sink treatment device for sewage produced in oil fields, which consists of a tank, a water inlet section A, a conglomeration and air-flotation section B, a drug mixed reaction section C and an air-flotation settling section D. The tank is designed into a rectangle shape, with top sealed; the water inlet section, the conglomeration and air-flotation section, the drug mixed reaction section and the air-flotation settling section are arranged in sequence from the left side to the right side of the tank; the water inlet section is communicated with the conglomeration and air-flotation section through a water distribution wall of the water inlet section; after the treatment by the conglomeration and air-flotation section, the sewage is communicated with a pipeline mixer of the drug mixed reaction section through a water pump, and then goes into a baffle reactor; after the treatment by the baffle reactor, the sewage is communicated with the air-flotation settling section via an inflow pipe of the air-flotation settling section; and the air-flotation settling section is divided into two chambers, namely, an air-flotation chamber and a sewage storage chamber treated in sequence by the conglomeration and air-flotation section, the drug mixed reaction section and the air-flotation settling section. After treated by the three sections, the sewage enters the sewage storage chamber through an overflow weir of the air-flotation settling section, and then goes to a sewage recycling system through a discharge valve. The conglomeration and flotation-sink treatment device for sewage produced in oil fields has the advantages of simple structure, convenient operation and high treatment efficiency.

Description

A technical field [0001] The invention relates to an oilfield production sewage purification device which integrates coalescence, air flotation, coagulation and inclined tube settlement technologies, specifically, an oilfield production sewage purification device which integrates coalescence air flotation oil removal and air flotation sedimentation slag removal technologies. The sewage coalescing floating sink treatment device is suitable for the purification treatment of produced sewage in the process of oil field production and development. Two background technology [0002] The treatment of oilfield produced water is the key to water flooding development. At present, the domestic oilfield produced water treatment processes mainly include gravity sedimentation, pressure sedimentation, flotation, cyclone and water quality modification and other sewage reinjection treatment technologies. It basically meets the needs of water flooding development in medium and high permeabili...

AI Technical Summary

Problems solved by technology

In recent years, with the deepening of tertiary oil recovery, the content of surfactants and other chemical agents in produced water has increased, resulting in more complex properties of produced water containing oil-displacing agents than conventional water flooding; The content of colloid, colloid and petroleum naphthenic acid is generally high, which increases the viscosity of the oil-water interface film and forms a stable o / w emulsion. The treatment effect of conventional process equipment is poor; and the tank body of the conventional process is large in size and occupies an area of Large, low equipment separation efficiency, long hydraulic retention time

Therefore, the conventional produced water treatment process can no longer meet the increasingly complex sewage water quality, resulting in increased cost of produced water reinjection treatment, and low compliance rate of injected water quality

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