Overheating steam-injection boiler system with oil extraction waste liquid with only suspended solids and hardness removed as water supply

Abstract

The invention discloses an overheating steam-injection boiler system with oil extraction waste liquid with only suspended solids and hardness removed as water supply. The overheating steam-injection boiler system comprises a suspended solid and hardness removing unit, a pH adjusting unit, a high-pressure water pump, a mixer, a boiler body, a cyclone separator, an upper collecting box and a lower collecting box. Before the oil extraction waste liquid enters a steam-injection boiler, only simple hardness removing and suspended solid removing need to be carried out; pH is adjusted to a proper value, so that silicon in the oil extraction waste liquid exists in a silicate state all the time and cannot be converted to silicon dioxide to cause boiler tube explosion, high operation cost for silicon removing can be saved; a steam-water separating technology with the cyclone separator as main equipment is used, supplied water can be heated to an over-heated state, salt cannot be separated out so that heat transfer deterioration can be avoided, and safety accidents are avoided. The overheating steam-injection boiler system can produce over-heated steam which meets steam injection requirements safely and continuously, and the oil extraction waste liquid which is subjected to simple water processing can be used as overheating steam-injection boiler water supply.

Description

technical field [0001] The invention belongs to the technical field of heavy oil injection superheated steam thermal recovery and boiler equipment, and in particular relates to a superheated steam injection boiler system. Background technique [0002] For heavy oil fields, the oil recovery process not only requires a large amount of steam, but also produces a large amount of oil recovery waste liquid. At present, oil production waste liquid generally needs to be treated with a series of complex processes such as oxygen removal, iron removal, hardness removal, silicon removal, salt removal, suspended solids removal, grease removal, pH adjustment, etc., before it can be used as feed water for steam injection boilers. The operating cost of the silicon removal process alone is as high as 3 yuan / m 3 Wastewater is less economical. In addition, in order to reduce the requirement on the salt content of the feed water and ensure the safe operation of the steam injection boiler, the...

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Problems solved by technology

At present, oil production waste liquid generally needs to be treated with a series of complex processes such as oxygen removal, iron removal, hardness removal, silicon removal, salt removal, suspended solids removal, grease removal, pH adjustment, etc., before it can be used as feed water for steam injection boilers. The operating cost of the silicon removal process alone is as high as 3 yuan / m 3 Wastewater, relatively poor economy

In addition, in order to reduce the requirement on the salt content of the feed water and ensure the safe operation of the steam injection boiler, the dryness of the outlet steam is also required to be lower than 80%, which greatly limits the application scope of the steam injection boiler in the oil field

However, the water quality of oil production wastewater is poor, and the water quality index of oil recovery waste liquid for thermal recovery is far from the water quality requirements of steam injection boilers

In addition, since the steam generated by the steam injection boiler will be directly used for oil recovery, the requirements for steam quality are greatly reduced, making the water quality requirements of conventional superheated boilers too stringent for steam injection boilers

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