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

A technology of oil extraction wastewater and high dryness, which is applied in the steam generation method using heat carrier, exploitation fluid, earthwork drilling, etc., can solve the problems of high power consumption, low process water production rate, complicated and lengthy pretreatment process, etc. Achieve the effects of no secondary pollution, reduced power consumption costs, and loose pretreatment requirements

Active Publication Date: 2015-06-10
CHINA PETROLEUM & CHEM CORP +1
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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 os

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

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Embodiment Construction

[0015] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0016] Such as figure 1 as shown, figure 1 It is a structural diagram of a system for preparing high-dryness steam for steam flooding by using oil production wastewater according to the present invention. The system for preparing high-dryness steam from oil extraction wastewater for steam flooding consists of a preheater 1, an evaporator 2, a steam-water separator 3, a steam compressor 4, a steam ejector 5, a circulation pump 6, a flash tank 7, The steam injection boiler system 8 and the steam mixer 9 are composed.

[0017] The preheater 1 receives the heavy oil produced water, heats the heavy oil produced water to nearly 100°C, discharges it into the outlet pipe of the steam-water separator 3, and pumps it into the evaporator 2 through the cir...

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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 ...

Claims

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Application Information

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IPC IPC(8): E21B43/24F22B1/16
CPCF22B1/16
Inventor 张建丁慧谷梅霞王辉苗春华李清方庞会中尹沂文王翀
Owner CHINA PETROLEUM & CHEM CORP
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