Oil shale composite heating in-situ exploiting system and method

Abstract

The invention discloses an oil shale composite heating in-situ exploiting system and method, and belongs to the field of oil shale in-situ exploiting. The exploiting system comprises an in-well heating system, a ground gas injection system, a well pattern system and a high-pressure breakdown system; and the exploiting method exploits based on the oil shale composite heating in-situ exploiting system. According to the underground fixed heating-injection-production differentiation design, the problems of sealing failure, obvious corrosion and the like caused by too large pressure of a heating injection-production integrated structure are effectively solved, and heat loss along the way is effectively reduced through underground normal-temperature gas injection; a thermal wall effect is formed in the heating process of a heating well, and heating is stable and controllable; a breakdown electrode discharges in the high-pressure atmosphere at the bottom of the well to generate air gap breakdown, the permeability of an oil shale target layer is further improved, a heater is fixed in the well and subjected to underground gas injection combined construction, heat heats the stratum in a heat conduction and heat convection composite heating mode, the heat transfer effect is further improved, and the energy consumption-output ratio is remarkably reduced; and the in-situ exploiting period and the exploiting cost are further close to those of commercial exploiting.

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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