Water vapor heat exchange system and movable steam injection boiler and steam injection method thereof

Abstract

The invention provides a water vapor heat exchange system and a movable steam injection boiler and a steam injection method thereof. The water vapor heat exchange system comprises a water type heat exchanger located between a water pump and a boiler convection section, a flue gas heat exchanger located in the boiler convection section and a radiation section heat exchanger located in a boiler radiation section. The water type heat exchanger comprises a heat exchanger inner pipe and a heat exchanger outer pipe which exchange heat with each other and are used for water medium circulation, wherein the heat exchanger inner pipe, the flue gas heat exchanger, the heat exchanger outer pipe and the radiation section heat exchanger are sequentially communicated in the water medium circulation direction. After absorbing energy in the convection section, a water medium enters the water type heat exchanger to serve as a heat source for heating a water medium which does not enter the convection section, so that the temperature of the water medium is increased to exceed the dew point temperature, and low-temperature corrosion of flue gas to finned tubes is avoided, a flue gas outlet of the radiation section is communicated with an overheating section, a superheat section heat exchanger used for further heating and evaporating the water medium is arranged in the overheating section, wet saturated steam from the radiation section is continuously heated and evaporated through the superheat section heat exchanger, and the steam injection effect on an oil well is guaranteed.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a water vapor heat exchange system, a movable steam injection boiler and a steam injection method thereof. Background technique [0002] The oil extraction industry is an important basis for promoting stable economic development and national defense security. Heavy oil is an important raw material for lubricating oil industry and aerospace industry. The development of heavy oil is of great significance to the energy industry. At present, the main problem of heavy oil production is the high cost. Steam injection technology is often used in heavy oil production. By injecting high-temperature steam into the oil layer, the viscosity of heavy oil can be reduced, so that crude oil can be easily recovered. Reducing the cost of steam injection needs to be solved urgently. The current technical situation of the oilfield is as follows: In the steam injection process, the st...

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Problems solved by technology

[0003] However, the current fixed boiler steam injection process has the following problems: First, due to the influence of the steam injection radius, the effective operation rate of boilers in Xinjiang Oilfield is only about 40%, and most of the more than 400 boilers cannot operate effectively; equipment occupation and depreciation costs are high; Second, the supporting steam injection pipeline network is long and large in diameter, and the pipeline construction investment is large; third, in the steam injection pipeline, the steam injection radius of a single well is long, and the heat loss is serious; fourth, the distance between a single well and the boiler is different , it is impossible to finely manage and compare the oil-gas ratio of a single well

[0004] The patent document CN202012901U discloses a movable steam injection boiler. The steam injection boiler is provided with a cooling chamber between the radiation section and the convection section. The burner is arranged on the radiation section. It is installed above the cooling chamber, and the chimney is at the outlet of the convection section. The main line of the steam injection boiler is filtered by the water treatment device, and the hardened water enters the plunger pump, and enters the tube bundle in the cooling chamber from the plunger pump. By absorbing the heat of the flue gas, the temperature of the water entering the convection section is increased, and the water flows out of the convection section and then directly enters the radiation section, which overcomes the shortcomings of the existing steam injection boilers that the flue temperature is too high during operation and the tube bundles in the convection section are corroded by acid.

However, the outlet of the flue gas in the radiant section is the position with the highest temperature, and the use of the cooling section to heat the water inevitably results in a waste of heat from the flue gas boiler

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