Auxiliary heating device and method for increasing oil-gas recovery rate of oil shale in-situ mining

Abstract

The invention relates to an auxiliary heating device and method for increasing the oil-gas recovery rate of oil shale in-situ mining, and belongs to the field of oil shale in-situ mining. The auxiliary heating device comprises an air compressor, a ground heat exchanger, a heating pipe, a temperature sensor, an automatic temperature control device, a gas pump, a staged condensing device, an oil-water separating device, a three-phase separator, a gas generator set, a combustible gas compressor and the like; and the heating pipe heats a heat injecting well section, the heating pipe and the groundheat exchanger jointly act to provide high-temperature gas for pyrolysis of an oil shale bed. The auxiliary heating method comprises the steps of early-stage preparation, a heating stage and an oil-production and gas-production stage. According to the auxiliary heating device and method, through a heating function of the heating pipe, on the one hand, the temperature of a production well is maintained within a certain range, and in-advance oil and gas condensation is effectively prevented; on the other hand, water in the product and a heating material react to release heat, and thus the watercontent in the product is effectively decreased; and combustible gas in the product is utilized to generate electricity to serve as an auxiliary power supply, and the cost expenditure is reduced.

Description

technical field [0001] The invention belongs to the field of in-situ mining of oil shale, and in particular relates to an auxiliary heating device and method for improving the oil and gas recovery rate of in-situ mining of oil shale. Background technique [0002] Oil shale, also known as kerogen shale, is a sedimentary rock that contains solid organic matter distributed within an inorganic mineral framework. Oil shale is a solid fossil fuel. As an energy source, when the oil shale is heated, the organic kerogen in it is pyrolyzed to produce shale oil. Shale oil can be processed to produce oil products, and can also be directly burned to generate steam and generate electricity. [0003] In the 21st century, the consumption of crude oil in various countries in the world has increased sharply. With the continuous consumption of limited fossil fuels, it is imminent to seek a new type of energy that can replace conventional oil and gas resources. Oil shale has attracted more an...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of premature condensation of some oil and gas during the in-situ pyrolysis process of oil shale, and to provide an auxiliary heating device and method for improving the oil and gas recovery rate of in-situ mining of oil shale

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