System closing method used for oil shale underground in-situ exploitation

Abstract

The invention discloses a system closing method used for oil shale underground in-situ exploitation. The closing system is composed of a top plate thermal insulation closing layer, a bottom plate thermal insulation closing layer and a horizontal exploitation area closing curtain. The system closing method comprises the steps of 1, the bottom plate thermal insulation closing layer is arranged at an oil shale layer bottom plate to cover an oil shale in-situ exploitation area and to connect the horizontal exploitation area closing curtain into an entirety; 2, the top plate thermal insulation closing layer is arranged at an oil shale layer top plate to cover the oil shale in-situ exploitation area, and a method of fracturing grouting is adopted to arrange the top plate thermal insulation closing layer, so that a grout in all grouting holes is mutually through; 3, the horizontal exploitation area closing curtain is consecutive and sealed, and through a method of permeation grouting, the grout penetrates through the exploitation oil shale layer bottom plate, and arrives at a bottom shale layer with poor water permeability. According to the system closing method used for oil shale underground in-situ exploitation, a sealed heating area is provided for oil shale underground in-situ exploitation, and the method is used for preventing exploitation area longitudinal underground water from entering, preventing heat loss and preventing horizontal underground water from entering and oil gas and side products from outflowing.

Description

technical field [0001] The invention relates to an underground in-situ system sealing method, in particular to a system sealing method for underground in-situ mining of oil shale. Background technique [0002] Oil shale in-situ mining technology is a new oil shale mining method after oil shale dry distillation. It forms heating channels in underground oil shale rock formations through drilling and hydraulic fracturing, and the heat source enters the heating channels. Afterwards, the oil shale is heated and dry-distilled, and the resulting oil-gas mixture is exported to the surface through the production well for separation. Compared with the oil shale dry distillation technology, the oil shale in-situ mining technology has the obvious advantages of less ground equipment, small footprint, and less pollution during the production process. [0003] The in-situ mining of oil shale needs to form a closed mining space underground which mainly includes oil shale heating channels a...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of long construction period, high energy consumption, environmental pollution and seasonal restrictions in the existing method of providing a closed space for the oil shale mining area, and to provide a method suitable for different buried depths and different System closure method for underground in-situ mining of thick oil shale

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