Same-well mining and irrigating device for medium-deep geothermal well and operation method thereof

Abstract

The invention relates to the technical field of geothermal exploitation, in particular to a same-well mining and irrigating device for a medium-deep geothermal well and an operation method thereof. Asurface casing inner diameter middle-downward drilling placement technology casing fixing method, and a technology casing inner diameter middle-downward drilling placement production solid pipe fixingmethod are adopted; and a tubular column structure of a production screen pipe is arranged at the bottom of a production solid pipe. The same-well mining and irrigating device for the medium-deep geothermal well is simpler and more reliable; and if an exploitation layer and a recharge layer need to be switched, a pipe column does not need to be pulled out, and only the replacement assembly in a geothermal water converter needs to be replaced, so that the construction period is shortened, and the maintenance cost is reduced.

Description

technical field [0001] The invention relates to the technical field of geothermal exploitation, in particular to a device for collecting and irrigating a medium-deep geothermal well in the same well and an operating method thereof. Background technique [0002] At present, the irrigation and irrigation methods of hydrothermal geothermal wells are usually different wells, that is, one production well needs to be matched with one or more reinjection wells, resulting in huge geothermal development costs. Among the technologies that have been disclosed, for example, Chinese invention patent 2018102169008 discloses a method for developing geothermal energy by recharging the same well. The process requirements are relatively high, and the cost of lifting and lowering the pump is relatively high; another example is Chinese invention patent 2017104908654, which discloses a well device for upper mining and lower irrigation and a mining process. Recirculation operation, and this proc...

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Problems solved by technology

[0002]Currently, the irrigation and irrigation method of hydrothermal geothermal wells is usually different well irrigation, that is, one production well needs to be matched with one or more reinjection wells, resulting in geothermal Development costs are huge

Among the technologies that have been disclosed, for example, Chinese invention patent 2018102169008 discloses a method for developing geothermal energy by recharging the same well. The process requirements are relatively high, and the cost of lifting and lowering the pump is relatively high; another example is Chinese invention patent 2017104908654, which discloses a well device for upper mining and lower irrigation and a mining process. Lifting operation, and this process is mainly aimed at the heterogeneous recharge of different thermal reservoirs. When the water chemistry compatibility of different thermal reservoirs is poor, chemical blockage will occur, which will affect the life of geothermal wells

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