High tower type geothermal production well and using method thereof

Abstract

The invention relates to a high tower type geothermal production well and a using method thereof, and belongs to the field of geothermal energy development. The high tower type geothermal production well comprises an inner shaft and an outer protection structure, wherein the inner shaft is connected with a production well shaft through an annular connecting assembly, the interior of the outer protection structure wrapped around the inner shaft is filled with a thermal insulation material, the outer protection structure comprises two half bodies which are oppositely arranged, and the half bodies can move through sliding rails arranged on the ground surface. According to the high tower type geothermal production well and the using method thereof, under the assistance of hoisting equipment, the inner shaft is exposed through movement of the outer protection structure, the inner shaft is replaced with a prepared replacement sleeve, after replacement is completed, the outer protection structure is closed again, and normal production can be rapidly recovered; and after normal production is recovered, calcium scale removal operation can be carried out on the replaced shaft with calcium scales attached to the inner wall on the ground surface. According to the high tower type geothermal production well and the using method thereof, the duration of production halt caused by descaling operation can be greatly shortened, meanwhile, the calcium scale removing effect is improved, the calcium scale removing speed is increased, and high economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of geothermal energy development, and in particular relates to a high-tower geothermal production well and a use method thereof. Background technique [0002] Geothermal energy is a kind of clean energy with huge reserves and wide distribution range, and has very high utilization value. Hot dry rock geothermal resources are one type of geothermal resources. Compared with hydrothermal geothermal resources, hot dry rock geothermal resources are more stable and have higher temperatures, which are more suitable for the design of stable power generation. But the disadvantage is that the burial depth is large. The current main development method is to drill production wells and injection wells at a certain distance, and create artificial thermal reservoirs by hydraulic fracturing and other means. After the cold water injected from the injection well is heated by the thermal reservoir, high-temperature water and s...

AI Technical Summary

Problems solved by technology

However, since the place where the calcium scale is generated is located far away from the surface, the removal efficiency of the deep calcium scale by conventional mechanical descaling methods is low. The calcium scale removed from the inner wall of the production well will continue to deposit downward, which may block some sections of the production well

At the same time, since the place where the calcium scale is generated is far away from the surface, when the method of injecting chemical drugs is used for descaling, the uniformity of drug distribution is largely out of control, and increasing the dose of injected drugs will increase additional economic costs.

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