Method for extracting shale oil gas through in-situ catalytic oxidation of oil shale

Abstract

The invention discloses a method for extracting shale oil gas through in-situ catalytic oxidation of oil shale. The method comprises the following steps: (1) drilling a plurality of hot gas injection wells and producing wells till a target oil shale layer; (2) hydrofracturing for artificial fracture forming through vertical well perforation or horizontal well drilling, and during fracture forming, uniformly mixing a propping agent and a catalyst according to a certain volume ratio and pressing a mixture together with a fracturing fluid into underground fractures till a whole fracturing zone is full of the propping agent and the catalyst; (3) injecting hot mixed gas into the oil shale layer through the hot gas injection wells so as to heat the oil shale layer till the temperature of the oil shale layer reaches 200 DEG C; (4) when the temperature of the oil shale layer reaches a certain range, stopping heating the mixed gas and continuing to inflate room-temperature mixed gas into the oil shale layer; and (5) exploiting the shale oil gas, and separating and treating on the ground. By the method, the acting range of the catalyst is widened, the catalytic effect of the catalyst is enhanced, a condition is provided for sufficient reaction of the oil shale, and thus the energy utilization rate of in-situ exploitation of the oil shale is increased and the reaction time is prolonged.

Description

technical field [0001] The invention relates to an oil shale in-situ mining technology, in particular to a method for extracting shale oil and gas by in-situ catalytic oxidation of oil shale. Background technique [0002] Currently, oil shale conversion technologies mainly include surface carbonization technology and underground in-situ conversion technology. [0003] Surface dry distillation technology refers to the process of stripping oil shale minerals from the surface or underground for mining, transportation, processing, and refining. The main method is to obtain shale oil by dry distillation in a dry distillation furnace, and further process it into light oil products and various chemical products. Although this technology is very mature, there are many problems, such as low energy utilization rate, large footprint, high cost, and serious environmental pollution. [0004] Underground in-situ conversion technology refers to the process of directly heating the buried ...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of high heat cost for in-situ heating of oil shale, slow cracking reaction of oil shale, low energy utilization rate, large floor area, high cost and serious environmental pollution, etc., and provide A method for extracting shale oil and gas by in-situ catalytic oxidation of oil shale that can reduce the minimum temperature of oil shale cracking, speed up the cracking rate of oil shale, and reduce the cost of shale oil and gas exploitation

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