Oil shale mining method and device

Abstract

Disclosed is an oil shale exploitation method, comprising: forming a first channel reaching the ground surface in the oil shale; forming a second channel reaching the ground surface from a coal layer located under the oil shale and a third channel that communicates with the second channel and reaches the ground surface from the coal layer; performing underground gasification on the coal layer to form a combustion cavity; and collecting oil and gas. Further provided is an oil shale exploitation device, the coal layer being located under the oil shale. The device comprises: a first channel disposed in the oil shale and reaching the ground surface from the oil shale; a second channel disposed in the coal layer and reaching the ground surface from the coal layer, the first channel being located above the second channel; and a third channel that communicates with the second channel and reaches the ground surface from the coal layer. According to the present invention, not only the energy utilization is increased, but also an artificial heat source is not required to implement gas preparation through in-situ dry distillation of oil shale.

Description

technical field [0001] The invention relates to the technical category of coal and oil shale mining, in particular to the technology of coal and oil shale in-situ co-gasification and dry distillation to produce oil and gas, and is especially applied to underground direct gasification and dry distillation of coal and oil shale to produce oil and gas. Background technique [0002] Oil shale is an unconventional oil and gas resource, which is a non-renewable fossil energy like oil, coal, and natural gas. The reserves of oil shale resources in the world are very huge. According to incomplete statistics, the reserves of oil shale resources in the world are about 10.5 billion tons, which is equivalent to about 475 billion tons of shale oil, which is 271 billion tons more than the total amount of traditional oil resources. tons more than 50%. my country is rich in oil shale resource reserves. The national oil shale resource reserves are about 719.93 billion tons, which is equivale...

AI Technical Summary

Problems solved by technology

[0004] There are three problems in the current comprehensive utilization of oil shale: 1. High cost

The traditional open-pit mining is stripping the soil and directly exploiting oil shale ore. This method takes up a lot of land, and oil shale mine mining has a large workload and high cost.

Oil shale needs to be crushed into very small particles on the ground for dry distillation. The dry distillation equipment is huge and the structure is complex, which increases the processing cost

Therefore, it is not economical to develop oil shale by surface dry distillation.

2. Greater pollution to the environment

Underground mining will cause surface subsidence, groundwater loss, and difficulties in the treatment of oil shale tailings and slag, etc.

3. Imperfect oil shale carbonization technology and equipment

Underground gasification coal mining technology has basically matured in my country, but due to the tightness of oil shale, direct mining of underground gasification is quite difficult

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