Downhole oil shale stratum combusting and heating system

Abstract

The invention discloses a downhole oil shale stratum combusting and heating system which can realize a heating range of 50-800 DEG C. The downhole oil shale stratum combusting and heating system comprises a ground monitoring and control system, a downhole combusting and tail gas countercurrent flow heat exchanging system, an external flow injection pipe and an external sleeve. When the downhole oil shale stratum combusting and heating system operates, fuel combusts in a sealed combustion cavity through a burner sleeve and does not directly contact with downhole external stratum environments. The downhole oil shale stratum combusting and heating system has the advantages that the system can be used as a heating body to directly heat downhole stratums and can also heats external fluid media under a well and then perform permeation heat and mass transmission on the stratums, and stratum hot gas exploitation, overheat steam exploitation and near / super critical fluid exploitation can be achieved. In addition, the downhole oil shale stratum combusting and heating system is applicable to in-situ conversion and exploitation of organic matters in oil shale reservoirs.

Description

technical field [0001] The invention relates to a combustion heating system for an oil shale layer in a well, in particular to a combustion heater in a well. Background technique [0002] The in-situ conversion and exploitation of organic matter in oil shale reservoirs is also called underground carbonization process, that is, the carbonization of underground oil shale is carried out directly, so that oil and gas are directly exported from underground to the surface through production wells. According to different heating methods, it is mainly divided into conduction heating (electric heating, combustion heating), fluid convection heating and radiation heating. [0003] At present, the most typical electric heating technology is Shell's ICP technology. This technology adopts the vertical drilling method, and the electric heater is placed in the oil shale layer through the drill hole, and the oil shale layer is heated by heat conduction. The kerogen in the shale is converted...

AI Technical Summary

Problems solved by technology

[0007] These in-situ heating technologies avoid the process of mining oil shale from underground to the surface, but there are still a series of problems such as low heat utilization rate, underground heating efficiency, high cost, and inconvenient installation and operation. The experimental stage cannot be realized in the construction

Therefore, a heating method with high heating efficiency and easy control is needed to solve the difficult problem of in-situ conversion technology of oil shale

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