Oil shale in-situ exploitation downhole ignition and heating device and heating method

Abstract

The invention discloses an oil shale in-situ exploitation downhole ignition and heating device and a heating method. The ignition and heating device comprises a high-pressure oil gas injection system,an ignition and heating measurement and control system, a downhole pipe column cable system and a downhole igniting system. When the ignition and heating device operates, firstly, compressed air is injected in a well through a center channel of a dual-wall drill pipe, and high-speed air flow is generated through an air nozzle; and then fuel oil is transported in the well through an annular hollowchannel between the inner wall and the outer wall of the dual-wall drill pipe, the fuel oil is atomized through a swirl nozzle and fully mixed with the high-speed air flow, the fuel oil is ignited under the heating action of a heating rod, and the heat generated by burning is used for heating an oil shale layer. Flame detectors monitor the burning conditions of downhole, a downhole packer enablesthe peak surface of the burning to extend and expand towards the ground layer in the well for heating an oil shale ore deposit. According to the oil shale in-situ exploitation downhole ignition and heating device and the heating method, the loss caused by energy pipeline transportation is reduced, and the burning efficiency of the fuel oil and the utilization ratio of the energy are improved greatly.

Description

technical field [0001] The invention relates to the field of unconventional energy exploitation, in particular to an ignition heating device and heating method for in-situ exploitation of oil shale underground. Background technique [0002] Oil shale, as a new type of energy that can replace conventional oil and gas resources in the 21st century, has always received extensive attention. Oil shale is a kind of sedimentary rock containing organic matter. The content of organic matter usually ranges from 5% to 50%. The main types can be classified into saprophytic, humic or mixed types. Inorganic minerals mainly include quartz, kaolin, clay, carbonate, etc. The organic matter (kerogen) inside it can generate shale oil and pyrolysis gas after high temperature treatment. [0003] At present, the exploitation and utilization of oil shale are mainly divided into two forms, including surface carbonization technology and underground in-situ cracking technology. The development of s...

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Problems solved by technology

[0007] Although the above-mentioned in-situ heating technology does not require the production process of mining oil shale mines from underground to the ground, which reduces the production cost to a certain extent, it still has low heat utilization rate, low heating efficiency, high comprehensive cost, equipment and instrument A series of problems such as inconvenient installation and operation have made many in-situ pyrolysis technologies still in the experimental stage and cannot be realized in field construction.

Therefore, there is an urgent need for a downhole heating device suitable for in-situ mining of oil shale to solve the difficult problem of in-situ conversion of oil shale

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