Oilfield Produced Water Resource Reuse Steam Injection Boiler Treatment System

Abstract

The invention relates to a steam-injection boiler treatment system for resource recycling of oilfield produced water. The system comprises a receiving tank, an air-entrainment flotation device, a filter, a high-density suspension clarifier, an MVC evaporator and an ion exchanger, wherein an exit of the receiving tank is connected with an entrance of the air-entrainment flotation device through a lift pump; an exit of the air-entrainment flotation device is connected with an entrance of the high-density suspension clarifier through the filter; a water outlet of the high-density suspension clarifier is connected with the MVC evaporator through the filter; and the MVC evaporator is connected with a boiler through the ion exchanger. In the invention, by introducing the thick oil produced water treatment system and technology taking the MVC evaporator as the core technology, the effluent quality is greatly improved, the oilfield sewage treatment efficiency is further increased, zero discharge and total recycling of thick oil sewage are realized, and the problems in the resource treatment of high-temperature high-salt oilfield sewage are solved.

Description

technical field [0001] The invention belongs to the field of oilfield sewage treatment, and in particular relates to a steam injection boiler treatment system for resource recovery of oilfield produced water. Background technique [0002] Since the mid-1980s, more than 70 heavy oil fields have been discovered in my country, and four heavy oil production bases in Liaohe, Xinjiang, Shengli, and Henan have been built successively, with more than 800 million tons of geological reserves put into development. Most of my country's oil fields have entered the middle and late stage of oil development, the comprehensive water content of crude oil reaches 70% to 80%, some oil fields even reach 90%, and the volume of produced liquid water is huge. However, most heavy oil fields use thermal recovery to drive oil, which consumes a lot of fresh water resources. At the same time, a large amount of excess sewage is ineffectively recharged and discharged, which brings great pressure to oil fi...

AI Technical Summary

Problems solved by technology

However, most heavy oil fields use thermal recovery to drive oil, which consumes a lot of fresh water resources. At the same time, a large amount of excess sewage is ineffectively recharged and discharged, which brings great pressure to oil field production.

At the same time, the thermal energy resources (>60°C) carried in the heavy oil sewage are lost in vain, causing environmental pollution

Heavy oil wastewater has difficulties such as large changes in water quality, small oil-water density difference, serious emulsification, etc., coupled with immature treatment process and other reasons, the outlet for heavy oil produced water has increasingly become a bottleneck restricting the development of heavy oil reservoirs

How to properly dispose of heavy oil produced water is a very serious economic and technical problem facing oilfield enterprises, which directly affects and restricts the sustainable development of oilfields

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