Oil shale mining method and device

Abstract

The invention discloses an oil shale mining method which comprises the steps of forming a first channel in the oil shale leading to the ground; forming a second channel leading from a coal bed below the oil shale to the ground, and a third channel communicated with the second channel and leading from the coal bed to the ground; carrying out underground gasification on the coal bed in order to form a burning-out area; and collecting oil gas. The invention further provides an oil shale mining device, the coal bed is located below the oil shale; the device comprises: a first channel arranged in the oil shale and leading from the oil shale to the ground, a second channel arranged in the coal bed and leading from the coal bed to the ground, wherein the first channel is located above the second channel, and a third channel communicated with the second channel and leading from the coal bed to the ground. According to the oil shale mining method and the device, the energy utilization rate is enhanced, and the coal gas is prepared from the oil shale by in-situ dry distillation without using an artificial heat source.

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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