A kind of oil shale composite heating in-situ mining system and method

Abstract

The invention discloses an oil shale composite heating in-situ exploitation system and method, belonging to the field of oil shale in-situ exploitation. Based on the oil shale composite heating in-situ production system for production, the downhole fixed heating-injection-production differentiation design in the present invention effectively solves the problems of sealing failure and obvious corrosion caused by excessive pressure of the heating-injection-production integrated structure, and the downhole normal temperature Gas injection effectively reduces the heat loss along the way; a hot wall effect is formed during the heating process of the heating well, and the heating is stable and controllable; the breakdown electrode discharges in the high-pressure atmosphere at the bottom of the well to cause air gap breakdown, the permeability of the oil shale target layer is further improved, and the heating The combined construction of in-well fixing and down-hole gas injection heats the formation in the form of heat conduction and heat convection combined heating, further improving the heat transfer effect, significantly reducing the energy consumption and output ratio, and the in-situ production cycle and production cost are further closer to commercial production.

Description

technical field [0001] The invention relates to the field of in-situ mining of oil shale, in particular to an oil shale composite heating in-situ mining system and method. Background technique [0002] As the exploration of unconventional energy resources such as oil shale, oil sands, oil-rich coal, coal bed methane and shale gas has been intensified in recent years, the proven reserves of unconventional energy resources are increasing year by year, and the exploration and application prospects are broad . [0003] Oil shale in-situ mining technology, also known as underground in-situ conversion technology, is to realize the exploitation of the target layer by injecting heat carrier medium into the target reservoir on the ground or downhole. The oil shale in the target interval undergoes hydraulic fracturing and shock wave fracturing technology to realize reservoir stimulation. The heat carrier medium exchanges heat with the oil shale in the target interval through conduct...

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Problems solved by technology

[0006] The object of the present invention is to provide a system and method for oil shale composite heating in-situ mining in order to solve the problems raised in the above-mentioned background technology, which is used to solve the problems caused by uneven oil shale in the process of oil shale in-situ mining. The thermal expansion effect and kerogen coking caused by nature seriously hinder the formation of heat injection. The conventional downhole gas injection-heating integrated structure often has the problem of sealing failure caused by excessive gas injection pressure during operation, so as to improve heat injection efficiency and reduce Mining cost

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