Phase change heat storage and heat pump heat source coupled heavy oil well heating system and control method

Abstract

The invention relates to the technical field of heavy oil well heating, in particular to a phase change heat storage and heat pump heat source coupled heavy oil well heating system and a control method. The system comprises an air source heat pump, a phase change energy storage system, a heat exchanger, a standby electric heating device, a buffer tank and a water mixing valve; independent heat supply or combined heat supply is achieved through opening and closing of the first valve and the second valve, meanwhile, the design that a heating circulation path of system return water and a heating circulation path of liquid in the phase change energy storage system are independent of each other is adopted, and a standby electric heating device is matched is adopted, so that when heat supply of the phase change energy storage system is insufficient, the heating circulation path of the liquid in the phase change energy storage system is not sufficient. The standby electric heating device can be used for rapid heat compensation, the heating timeliness is high, the problem that system return water heating timeliness is incompatible with heat supply of a phase change energy storage system is solved, a stable and sustainable heat source is provided for an underground hot water circulation unit, and the system has the advantages of multi-stage standby and guarantee of continuous operation, can also be conveniently controlled, and is suitable for popularization and application. And the complexity of the control system is reduced.

Description

technical field [0001] The invention relates to the technical field of heavy oil well heating, in particular to a heavy oil well heating system and control method coupled with phase change heat storage and heat pump heat source. Background technique [0002] Domestic heavy oil reservoirs generally have the characteristics of deep burial, high colloid and asphaltene content, and scattered oil-bearing areas. Many heavy oil reservoirs still have a large amount of residual oil after conventional mining. At the same time, with the continuous increase of mining depth, problems such as wax deposition on the sucker rods will occur, which seriously affects the oil field production efficiency. [0003] Oilfield enterprises mainly reduce the viscosity of downhole heavy oil by heating viscosity reduction method, thermal compound chemical huff and puff method, thinning viscosity method and adding viscosity reducer. However, the thermal compound chemical huff and puff method is expensive...

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Problems solved by technology

The traditional methods of heating injected water mainly include boiler heating method and geothermal method. Relying on the continuous heating of boilers consumes a large amount of coal resources, which increases production costs, while the geothermal method has low heat supply and low heat conversion rate, which cannot meet mining needs.

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