Method and system of producing superheated steam

Abstract

The invention provides a method and a system of producing superheated steam. The method of producing the superheated steam comprises the following steps: A. qualified softened water is introduced to a steam-injection boiler to produce wet steam with the temperature of 350 DEG C and dryness of 75%; B. steam-water separation is carried out on the wet steam, and saturated water and dry steam with dryness of above 99% are separated out; and C. the dry steam is introduced into a secondary steam heater to be heated, and superheated dry steam with the superheat degree of 30-40 DEG C is obtained. The system of producing the superheated steam comprises the steam-injection boiler used for producing the wet steam, a steam-water separator connected with the steam-injection boiler, and a steam heating boiler connected with the steam-water separator, wherein the steam-water separator comprises a steam outlet and a saturated water outlet, and the steam heating boiler is independent from the steam-injection boiler. The method and the system of producing superheated steam produce the superheated steam with the superheat degree of 10 DEG C, fully utilize the heat of separated water, and reduce the processing amount of the separated water.

Description

technical field [0001] The invention relates to the field of thermal recovery of heavy oil, in particular to a method and system for generating superheated steam. Background technique [0002] The most widely used steam injection equipment in oilfields is the wet steamer generator, which converts water into wet saturated steam with a dryness of 75, injects it downhole, heats the oil layer, reduces the viscosity of crude oil, and improves the recovery factor. In the later stage of heavy oil production, conventional wet-saturated steam with a dryness of 75 is injected downhole, and the dryness at the bottom of the well is only 30, which cannot meet the needs of heavy oil production. [0003] The superheated steam generation method currently in use is based on the conventional wet steam generator. Water is introduced into the steam injection boiler, and after heat exchange in the convection section of the steam injection boiler and gasification in the radiation section, 75% of ...

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Problems solved by technology

Among them, the heating section of the steam injection boiler is an area re-separated from the transition section of the original steam injection boiler. Although the dry steam with a dryness of more than 99% is heated again, the two successive heatings of the steam use one injection However, the two successive heatings of the steam still affect each other and cannot be adjusted independently of each other and can not be quantitatively provided. In actual production, the superheated steam injected downhole cannot guarantee the required temperature

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