Pilot-scale organic rock long-distance multi-stage heating method for supercritical water-oxygen oil production and hydrogen production

Abstract

The invention belongs to the technical field of clean and efficient exploitation of deep unconventional or conventional resources, and discloses a method for producing oil and hydrogen with supercritical water and oxygen by long-distance multi-stage heating of pilot-scale organic rocks. The organic rock blocks in the reactor are heated to form a step-by-step reaction, step-by-step control, and step-by-step collection, which realizes the long-distance reaction of supercritical water and oxygen to produce oil and hydrogen, and makes the organic rock blocks decompose more fully. Supplemented by oxygen injection and other measures, the optimal oxygen injection parameters for supercritical water pyrolysis of organic rocks for oil production and high-temperature residual carbon plus oxygen for hydrogen production are obtained, and the release characteristics of oil and gas products under different reaction distances are explained; the present invention can control the heat injection temperature, The quality of oil and gas products under the comprehensive effect of parameters such as heat injection pressure and reaction distance is systematically analyzed to provide a theoretical basis for field practice.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient exploitation of deep unconventional or conventional resources, and specifically relates to a method for producing oil and hydrogen with supercritical water and oxygen for long-distance multi-stage heating of pilot-scale organic rocks. It is used for the pilot-scale simulation process of supercritical water-oxygen pyrolysis of organic rocks, which can realize the functions and effects of in-situ oil and hydrogen production from organic rocks. Background technique [0002] At present, the mining method of organic rock deposits is mainly underground mining, but the environmental and ecological problems caused by underground mining are becoming more and more serious. Pollution of the atmosphere, the formation of mine fog and acid rain and other environmental problems; on the other hand, mining is likely to cause land subsidence, damage to ground buildings and structures, groundwater loss a...

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Problems solved by technology

[0004] The existing Chinese patent CN 110965968 A in this field uses electric heating technology to heat oil shale, and then feeds nitrogen or other liquids to discharge oil and gas products formed by pyrolysis of oil shale; Chinese patent CN112727418 A, The process of high-temperature steam pyrolysis of oil shale and oil and gas collection is simulated; the existing problems in the prior art are: the reaction distance is short, and the simulated results are quite different from the actual site; the high-temperature residual carbon formed by oil shale pyrolysis cannot further utilization; and inability to achieve staged heating

For deep organic reservoirs, due to the long well pipes, the heat dissipation of high-temperature water vapor injected from the wellhead to the ore layer is serious, and the efficient pyrolysis of deep reservoirs cannot be guaranteed

The high-temperature residual carbon formed by the pyrolysis of oil shale cannot be further utilized. If oxygen injection is performed, the material of the reactor cannot meet the high-temperature conditions, so the oxygen injection function cannot be realized, and the in-situ hydrogen production process cannot be simulated.

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