Method and process for extracting shale oil and gas by in-situ shaft fracturing chemical distillation of oil shale

Abstract

The invention provides a method and a process for extracting shale oil and gas by in-situ shaft fracturing chemical distillation of an oil shale. The method comprises the steps of drilling a shaft on an underground oil shale layer, injecting high-pressure medium (air, water and sand) into the oil shale layer; fracturing out a 1-3mm of crack on the oil shale layer by taking the shaft as a center; filling a crack support, and building an oil-gas channel; adding a heating device to the oil shale layer; heating the oil shale layer to 550 DEG C; initially distilling the oil shale, extracting the shale oil and gas, and leading the shale oil and gas out of the ground through the oil-gas channel; then leading in an oxidant to carry out oxidizing reaction on contained asphaltene and fixed carbon after the oil shale is distilled; and taking the generated heat energy as a heat source for subsequent distillation to achieve underground in-situ extraction of the shale oil. The world problems of large recovery cost, difficult tailings processing, a plurality of environmental protection problems and large land usage of ground dry distillation at present are solved.

Description

technical field [0001] The invention discloses a method and process for extracting shale oil and gas by in-situ shaft fracturing chemical dry distillation of oil shale. The in-situ extraction of shale oil from oil shale underground is used as supplementary unconventional oil and gas energy for lack of petroleum resources, and belongs to petroleum dry distillation. technology field. technical background [0002] At present, oil shale can be used to replace natural oil by refining shale oil-artificial oil through dry distillation technology; it can also be used to generate electricity by burning it. Under the current high oil price situation, shale oil refining has good economic benefits and is the most realistic and available measure to supplement the shortage of natural oil; oil shale power generation has good economic and environmental protection for coal-deficient provinces and regions , Social benefits. However, the traditional development model adopts underground minin...

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Problems solved by technology

[0003] (1) The mining cost of dry distillation on the ground is high;

[0004] (2) The above-ground dry distillation occupies a large amount of land;

[0005] (3) Dry distillation on the ground caused a large amount of land subsidence in the mining area;

[0006] (4) It is difficult to dispose of the residue after dry distillation on the ground, and a large amount of accumulation will cause secondary pollution;

[0007] (5) After the dry distillation on the ground, the residue takes away a lot of heat, and the heat energy of the residue cannot be used, resulting in energy waste;

[0008] (6) The waste gas and sewage produced by above-ground dry distillation exceed the standard of environmental pollution

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