System and method for in-situ cracking of oil shale

Abstract

The invention relates to a system and method for in-situ cracking of oil shale, and belongs to the field of in-situ cracking and mining of oil shale. The system comprises a first oil tank, an oil pump, a pressure stabilizing tank, an air compressor, a filter, a water pump, a water tank, a super-burning heater, a double-wall oil pipe, a water guide channel and a heat-sensitive packer. The method comprises the following steps that after the reconstruction of an oil shale reservoir is completed, the super-burning heater is lowered to an appropriate position of the oil shale reservoir and the double-wall oil pipe is used to connect the super-burning heater with surface equipment; the oil in oil tank on the ground is delivered to the oil tank of the super-burning heater through the internal passage of the double-wall oil pipe by the oil pump, and the high-pressure air is delivered to the super-burning heater through the external passage of the double-wall oil pipe by the air compressor; andthe hot fluid atomized by the super-burning heater flows out into the oil shale reservoir and heats the oil shale reservoir. The presence of water promotes the cracking of the oil shale, and carbon dioxide increases the displacement of oil and gas produced by the cracking of the oil shale, and thus the energy efficient utilization rate and oil and gas recovery efficiency of oil shale cracking canbe improved.

Description

technical field [0001] The invention belongs to the field of in-situ cracking and exploitation of oil shale, and particularly relates to a system and method for in-situ cracking of oil shale. Background technique [0002] Oil shale is known as a substitute resource for oil. At present, the in-situ cracking method of oil shale mainly includes an air injection-assisted ultra-heavy oil underground cracking and upgrading process based on the wellbore heating mode proposed by Wang Yanyong of China University of Petroleum. See the patent application publication number "CN106499376A" for details. This process combines the advantages of electric wellbore heating and air injection technology, and can solve the problems of heat transfer mode and single driving energy in a single wellbore electric heating mode, but the production cycle of oil shale is not enough. For a long time, air ventilation will lead to oxidative emulsification of shale oil, and emulsification in the formation wil...

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Problems solved by technology

[0003] Aiming at the problems of low effective utilization rate and long heating period caused by multi-stage conversion of energy in the process of in-situ cracking and mining of oil shale, the present invention provides a system and method for in-situ cracking of oil shale, which reduces the Multi-stage conversion of energy can effectively shorten the in-situ cracking cycle of oil shale and improve oil and gas recovery

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