System for utilizing oil field produced wastewater to prepare high-dryness steam for steam flooding

Abstract

The invention provides a system for utilizing oil field produced wastewater to prepare high-dryness steam for steam flooding. After thick oil produced water is heated through a preheater of the system, the thick oil produced water is drained into a water outlet pipe of a steam-water separator; a circulating pump conveys the thick oil produced water to an evaporator in a pumping mode, the thick oil produced water is heated through the evaporator to form a gas-liquid mixed phase, and the gas-liquid mixed phase enters the steam-water separator to be processed through steam-water separation; thick water formed through separation enters the water outlet pipe of the steam-water separator; steam formed through separation enters a steam compressor, the temperature of the steam is increased, the heated steam is conveyed to the evaporator, and serves as a heat source to enter the evaporator and to conduct heating, the thick oil produced water can evaporate, and the steam cools to form produced plain water; and the produced plain water is heated through a steam-injection boiler system to form the high-dryness steam. The system is low in pretreatment requirement, free of secondary pollution and low in cost, and latent heat energy contained in high-temperature sewage water drained by the steam-injection boiler system can be fully utilized.

Description

technical field [0001] The invention relates to the technical field of petroleum development, in particular to a system for preparing high-dryness steam by using oil production wastewater for steam flooding. Background technique [0002] Heavy oil reservoirs have now become an important development position for stable and increased crude oil production in my country. Steam-driven thermal recovery is generally used for heavy oil development. Since the steam water source has been using surface or underground clean water, the heavy oil sewage separated from the heavy oil production fluid nowhere to dispose of. After the heavy oil sewage is effectively treated, it can replace the increasingly scarce clear water resources and be used as a steam water source for thermal recovery of heavy oil. It not only realizes zero discharge of oilfield sewage, responds to the needs of building a "green oilfield", but also meets the requirements of circular economy and clean production. policy ...

AI Technical Summary

Problems solved by technology

At present, the desalination of oilfield sewage generally adopts mechanical compression evaporation process, which has a high and stable water production rate and consumes a lot of electric energy, which cannot make full use of the waste heat resources of the oilfield sewage surface system; Since the reverse osmosis membrane has extremely strict requirements on the quality of influent water, the pretreatment process before the desalination process is complicated and lengthy, and when treating oil production wastewater with high salt content, the water production rate of the process is extremely low. cooling treatment

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