METHOD AND PROCESS FOR SHALE OIL AND GAS EXTRACTION BY FRACTURING AND CHEMICAL RETORTING IN OIL SHALE IN SITU VERTICAL WELL

摘要

A method and process for shale oil and gas extraction by fracturing and chemical retorting in an oil shale in situ vertical well. A vertical well (1) is drilled towards an underground oil shale stratum (6) and a highly pressurized medium is injected into the oil shale stratum, cracks of 1 to 3 mm are fractured in the oil shale stratum with the well serving as the center and are filed with a gap filler, and, an oil and gas channel (8) is established. Then, a heating apparatus is added into the oil shale stratum to heat the oil shale stratum to 550 °C, the oil shale is initially retorted, the shale oil and gas are extracted, and the shale oil and gas are led out of the ground via the oil and gas channel, and then are introduced to an oxidizer for oxidization reaction with asphaltenes and fixed carbon contained in the oil shale when retorted, where the heat generated is used as a heat source for subsequent retorting, thus implementing underground in situ shale oil extraction. This solves the problem that existing ground-level retorting has in terms of large extraction costs, difficult treatment of tailings, a variety of environmental issues, and large land-use footprint.