Critical medium injection oil shale single-well huff and puff transformation process

Abstract

The invention discloses a critical medium injection oil shale single-well huff and puff transformation process. The critical medium injection oil shale single-well huff and puff transformation process has the advantages that a working well is drilled at first to form a single-well mode, perforation is carried out on the locations of oil shale strata at the bottom of the well, accordingly, the porosity of oil shale can be increased, and the permeability of the oil shale can be improved; water and gas are injected into the working well and are heated, so that preset critical environments can be created at the bottom of the well, pyrolysis of organic matters in the oil shale can be completely carried out under extraction and catalysis effects of critical media, the oil shale can be ultimately extracted step by step from the inside to the outside along with gradual permeation of the critical media into the oil shale, and oil and the water can be separated from each other after obtained oil and water mixtures are extracted to earth surfaces, so that shale oil and shale gas can be obtained; the separated critical media can be recycled and injected after reaction is completely carried out, so that waste heat can be reused; the exploitation cost can be reduced, and the exploitation efficiency can be improved.

Description

technical field [0001] The present invention relates to an oil shale mining process, in particular to a critical medium injection oil shale single well huff and puff conversion process. By injecting critical medium into a single well, the organic matter of oil shale is cracked into organic compounds with different chain lengths, thereby Obtain shale oil and shale gas to realize in-situ conversion of oil shale. It is a method that can increase the oil production rate of oil shale. This technical method can be widely used in in-situ mining of solid or condensed mineral fuels (oil shale, coal, heavy oil). Background technique [0002] Looking at the development of the international society and economy in the past, it can be found that oil plays a very important role in politics, military affairs, diplomacy, etc., and the competition in the oil field is becoming increasingly fierce. my country has become a net importer of oil since 1993, and its dependence on imported crude oi...

AI Technical Summary

Problems solved by technology

Although the surface dry distillation technology is relatively mature and widely used, it has many disadvantages: it produces highly polluted waste gas and sewage, accumulates a large amount of waste residue, occupies a large area, and pollutes the environment; the mining of underground oil shale is likely to cause goafs, resulting in land subsidence

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