Oil shale in-situ exploitation reaction zone control system and process method

Abstract

The invention discloses an oil shale in-situ exploitation reaction zone control system and process method, and belongs to the field of oil shale in-situ exploitation, the system comprises a well pattern system, a heating system and a ground gas injection system, the process method is divided into a drying preheating stage, a high-temperature heating stage, a reverse gas injection self-heating stage, a normal-temperature reverse gas injection self-heating stage and a high-pressure displacement stage, according to the reverse gas injection process method, the problem that a seepage migration channel is blocked and cemented due to the fact that the viscosity of shale oil and asphaltene is increased due to large heat loss of underground oil-gas migration can be effectively solved, and the reverse gas injection process method is stable and adjustable in temperature, pressure and gas flow; the method can ensure that the self-heat-generation reaction of the oil shale layer is stably expanded forwards, shale oil and gas products are not blocked and cemented under the condition of waste heat in a high-permeability reaction complete area, the method is particularly suitable for long-well-spacing underground unconventional energy in-situ exploitation, the construction period is short, underground accidents are few, construction operability is high, and the method is suitable for industrial production. The reaction rate of the reaction zone is controllable.

Description

technical field [0001] The invention relates to the field of in-situ mining of oil shale, in particular to a control system and a process method for a reaction zone of in-situ mining of oil shale. Background technique [0002] With the gradual increase in the exploration and development of unconventional energy such as oil shale oil, shale oil and gas, oil-rich coal, oil sands, and coalbed methane in recent years, the continuous discovery of unconventional energy and the exploration of unconventional energy resources The proven reserves are increasing year by year, and the mining and application prospects are broad. [0003] Oil shale in-situ mining technology, also known as underground in-situ conversion technology, is to inject heat carrier media such as steam, CO 2 , N 2 and O 2 etc. to realize the exploitation of the oil shale target layer. The heat carrier medium is heated to the preset temperature by the heating device, and conducts heat exchange with the oil shale...

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Problems solved by technology

[0005] The object of the present invention is: to solve the problems raised by the above-mentioned background technology, and provide a control system and process method for the reaction zone of in-situ mining of oil shale, which is used to solve the problem of excessive heat loss in the process of in-situ mining under the condition of large well spacing. High oil and gas products in the target reservoir block the seepage channel and the production cost is too high

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