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System and method for in-situ pyrolysis of oil-rich coal through steam heat injection

An in-situ pyrolysis and water vapor technology, applied in earthwork drilling, wellbore/well components, mining fluids, etc., can solve problems such as pollution and surface soil pollution, and achieve cost reduction, high energy density, and reduced system design The cumbersome effect of making

Pending Publication Date: 2022-07-26
陕西省煤田地质集团有限公司 +1
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Problems solved by technology

The process of conventional mining to the ground and then refining oil in the refining furnace produces a lot of pollution, and the pyrolysis residue with low volatile content after pyrolysis is also a huge amount of solid waste. produce pollution

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  • System and method for in-situ pyrolysis of oil-rich coal through steam heat injection
  • System and method for in-situ pyrolysis of oil-rich coal through steam heat injection

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0029] see figure 1, the present invention provides a system for in-situ pyrolysis of oil-rich coal by steam injection, including a steam generating part composed of a pressurized water pump 1, a condensing heat exchanger 2, a steam generating device 3, and steam 5 of different temperatures , the centrifuge 4, the liquid oil 6, the separation and recovery water 7, the organic gas 8, and the oil-gas-water separation part composed of the water circulation filter device 9; the steam injection 10, the steam supplementary heat 11, the No. No. 13 coal seam block, heat injection well 14, production well 15, coal seam fracturing channel 16, No. 1 valve 17, No. 2 valve 18, No. 3 valve 19, No. 4 valve 20 The in-situ pyrolysis and thermal energy utilization part. The system comprehensively considers the optimization of the in-situ pyrolysis part, the heat energy utilization par...

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Abstract

The invention discloses a system and method for in-situ pyrolysis of oil-rich coal through steam heat injection. The system comprises a pressurizing water pump, a condensation heat exchanger, a steam generation device, a centrifugal machine, a water circulation filtering device, a heat injection well, a production well and other components. Aiming at fuel with high tar yield such as oil-rich coal and the like which is easily decomposed to generate oil gas after being heated, water vapor is adopted as a heat injection medium, in-situ pyrolysis of a coal seam is carried out by gradient utilization of heat energy of the water vapor, and the function of co-production of oil gas in the oil-rich coal is achieved. Oil and combustible gas resources generated in the pyrolysis process are extracted, separated water is recycled, pollutants are not directly discharged to the environment, waste heat of products obtained after pyrolysis is comprehensively utilized, and the multi-phase separation process of oil, gas and water is achieved. According to the system, heating and waste heat utilization under different working conditions in the in-situ pyrolysis process are achieved with fewer components, low-energy-consumption and efficient utilization of oil-rich coal is achieved, and the shortage of oil and gas resources in China is relieved.

Description

technical field [0001] The invention relates to a system and a method for in-situ pyrolysis of oil-rich coal by steam injection. Background technique [0002] The development cost of conventional oil resources is getting higher and higher, and the development of unconventional oil and gas resources provides another way to supply oil. Heating and pyrolysis of oil-rich coal with high tar yield can produce a considerable amount of oil and gas products. Pyrolytic conversion of these coals can avoid direct combustion of coal, reduce air pollution, and enhance national energy security. The process of conventional mining to the ground and then making oil in the refining furnace produces a lot of pollution, and the low-volatile pyrolysis residue after pyrolysis is also a huge amount of solid waste. produce pollution. As an emerging mode, underground in-situ pyrolysis can reduce the pollution to the atmosphere and soil. The process of heating and pyrolysis extraction is carried out...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/34
CPCE21B43/24E21B43/2405E21B43/34
Inventor 杨甫毛崎森段中会王长安马丽宁星付德亮车得福
Owner 陕西省煤田地质集团有限公司
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