Oil shale in-situ mining method

Abstract

The invention discloses an oil shale in-situ mining method and belongs to the field of oil shale mining. The method includes the following steps: arranging a pipe column communicated to a mined oil shale layer, and arranging a heater at the horizontal section of the oil shale layer; injecting water into the mined oil shale layer through the pipe column, and heating the injected water to be at a temperature not small than the thermal cracking temperature of oil shale through the heater to crack the oil shale; recovering shale oil and shale gas after cracking; injecting separated water (steam) into the underground oil shale for recycling. In-situ mining of the oil shale can be realized through water injection, heating and cracking, a wellhead steam generating device is not needed, and injection of hydrocarbon gas is not needed; the separated water (steam) is circularly injected, so that water consumption quantity is small, high temperature which is difficulty to reach on the ground can be reached, and generated heat can be used for heating a stratum in an in-situ manner; treatment of residues of the oil shale is not needed, so that small environment pollution, temperature controllability and low cost are realized.

Description

technical field [0001] The invention relates to the field of oil shale mining, in particular to an oil shale in-situ mining method. Background technique [0002] Oil shale is a sedimentary rock containing solid combustible organic matter, which is generally called kerogen or kerogen, and is often gray-brown or black. In the natural state, natural oil shale is a kind of argillaceous shale with extremely low permeability and porosity, and kerogen exists in the oil shale in solid form and is integrated. The micro-bedding inside the oil shale is completely closed in situ underground. Among all fossil fuels, oil shale ranks second only to coal if the reserves are converted into calorific value; the oil shale reserves in the world are quite large, and if converted into shale oil, it can reach more than 4,000 billion tons, which is equivalent to more than five times the world's natural proven crude oil recoverable reserves. It is a potentially huge energy source and one of the in...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a mining method for in-situ heating of oil shale and injection of water, which can realize in-situ mining of oil shale at a relatively low cost, thereby solving: environmental pollution in open-pit mining; ecological damage in underground roadway mining; The cost of IVE process is high; in-situ steam injection equipment is huge and costly, especially the in-situ heating efficiency of conventional oil shale is low

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