Flue gas resource utilizing system of oil field stream-injecting boiler based on steam injection and application thereof

Abstract

The invention discloses a flue gas resource utilizing system of an oil field stream-injecting boiler based on steam injection. The flue gas resource utilizing system comprises a steam injection system, a stream-injecting boiler system, a thickened oil production system, a produced liquid separating system and a foam generating system. The stream-injecting boiler system and the steam injection system are arranged in series connection and closed loop modes. The steam injection system, the thickened oil production system and the produced liquid separating system are arranged in series connection and closed loop modes. The foam generating system is arranged on the thickened oil production system. According to the flue gas resource utilizing system of the oil field stream-injecting boiler based on steam injection, the steam injection technology is adopted, high temperature and high pressure steam is used for injecting flue gas, and high pressure steam-flue gas mixed fluid is formed; the high temperature and high pressure steam generated by the boiler is used as working fluid of a steam injector, and the flue gas generated by boiler fuel combustion is used as injecting fluid of the steam injector. The flue gas in the produced liquid is separated and injected back into the steam injector, so that flue gas zero emission is realized. By the adoption of the system and the application thereof, profile control plugging of formation heterogeneity can be achieved, and the anti-corrosion requirement of an injection tubular column can further be met.

Description

technical field [0001] The invention relates to a steam injection-based oilfield steam injection boiler flue gas resource utilization system and its application, belonging to the technical field of thermal oil recovery and flue gas capture, utilization and storage. Background technique [0002] Since the formation pressure will drop significantly, the effect of single steam huff and puff is no longer obvious after the development of steam injection in the oil field enters the middle and late stages. On the basis of the original steam injection, injecting nitrogen or carbon dioxide into the oil well can achieve a better development effect. When a large amount of carbon dioxide dissolves in crude oil, due to its high solubility in water and oil, it can expand the volume of crude oil and reduce its viscosity; it also has outstanding effects such as increasing the permeability of the reservoir and improving the mobility ratio. Due to the low solubility of nitrogen in water, the...

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Problems solved by technology

However, this patent does not fundamentally solve the problem of direct pressurization of boiler flue gas. The boiler flue gas still needs to be purified and then compressed. The process equipment is complicated and the investment is large; on the other hand, when steam-flue gas mixed injection However, the corrosion problem caused by steam condensation and flue gas mixing during the injection process has not been considered. The occurrence of corrosion will not only lead to an increase in production costs, but also endanger the safety of on-site construction in severe cases

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