Steam-injection boiler used for producing high-dryness superheated steam

Abstract

The invention relates to a steam-injection boiler used for producing high-dryness superheated steam, which comprises a heat interchanger, a radiant section, a convection section, a chimney, an external steam-water separator, an overheater, a boiler body, a water pipeline, a burner, an electric heater, an oil heater and a flash tank. The front part inside the boiler body is provided with a burner, the middle part thereof is provided with the radiant section, the rear part thereof is provided with the convection section; the burner is respectively connected with the electric heater and the oil heater through a lead and a pipeline; the outside of the radiant section is provided with the heat interchanger; an exit is provided with an external steam-water separator; the heat interchanger is connected with a water-feeding pump through the water-feeding pipeline; the steam-water separator is respectively connected with the overheater and the flash tank through the pipeline; the lower part of the convection section is provided with the overheater, the upper part thereof is provided with the chimney; and the radiant section and the convection section are respectively connected with the heat interchanger through the pipeline. The boiler is novel in structure, reasonable in design, and reliable in working, and can produce high-dryness superheated steam, thereby improving the effect of thick oil thermal recovery technology in SAGD.

Description

Technical field: [0001] The invention relates to a special equipment for thermal recovery of steam injection in heavy oil fields. Background technique: [0002] The steam injection boiler is a special equipment for producing and supplying steam in the steam injection thermal recovery process of the heavy oil oil field. At present, the steam injection boilers commonly used on site are composed of radiation section, transition section, convection section and chimney, which can produce saturated wet steam under a certain pressure, with a dryness of 60-80% and a temperature of saturated steam under a certain pressure. , can not produce superheated steam with high relative dryness and high temperature, and cannot meet the needs of the heavy oil thermal recovery process from steam huff and puff to steam-assisted power drainage (abbreviated as SAGD). For the SAGD mining process, the higher the dryness of the steam injection, the better, and the best quality superheated steam is re...

AI Technical Summary

Problems solved by technology

In addition, when the saturated wet steam is transported to the steam injection wellhead, condensed water is separated, which further reduces the dryness of the steam, resulting in a decrease in the oil-steam ratio and cumulative oil production, which seriously affects the oil pumping production effect

Images