Water-coal-slurry steam injection boiler in oilfields

Abstract

The invention relates to the technical field of steam injection boilers for heavy oil wells in oilfields, in particular to a water-coal-slurry steam injection boiler in oilfields. The water-coal-slurry steam injection boiler comprises a boiler body, an upper water cooling wall, a lower water cooling wall, a superheater and an air preheater, an inverted-U-shaped flue is arranged in the boiler body and comprises a left vertical flue body, an upper horizontal flue body and a right vertical flue body, and a left flue slag-drip opening is formed in the bottom of the boiler body at the lower end of the left vertical flue body. The water-coal-slurry steam injection boiler has the advantages that the water-coal-slurry steam injection boiler is reasonable and compact in structure and convenient to use; a combustor in the steam injection boiler takes water coal slurry as fuel, and air is preheated by the air preheater and then is delivered to the water-coal-slurry combustor, so that flame extinguishing caused by low air temperatures is avoided, and reliability and stability in combustion are improved; combustion wastes can be discharged via the slag-drip opening, long-term continuous running and substituting the water coal slurry fuel for natural gas fuel can be achieved, and accordingly clean combustion, energy saving and emission reduction are achieved; the steam injection boiler is high in heat utilization ratio and convenient to move and transport.

Description

technical field [0001] The invention relates to the technical field of heavy oil well oil field steam injection boilers, and relates to a coal water slurry oil field steam injection boiler. Background technique [0002] In my country, such as the Karamay area in Xinjiang, heavy oil fields are mainly used; heavy oil has special characteristics of high viscosity and high freezing point. At present, heavy oil production generally adopts the thermal recovery method of steam huff and puff; steam huff and puff is to inject high-temperature and high-pressure steam at 250 to 350°C into the oil well, so that the oil layer and crude oil within a considerable distance near the well are heated, and the heat in the heating zone formed in this way The viscosity of crude oil is reduced, the resistance of crude oil to the bottom of the well is greatly reduced, and the oil yield is increased. It is a very effective method to increase the production of heavy oil wells; Gas-fired steam inject...

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Problems solved by technology

[0003] The present invention provides a coal-water slurry oilfield steam injection boiler, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the currently known coal-water slurry fuel steam injection boiler cannot operate continuously for a long time

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