Geothermal well temperature measuring nipple

Abstract

The invention provides a geothermal well temperature measurement short section, which is characterized in that a conducting ring and a temperature measurement bus are embedded in a heat insulation bushing of the temperature measurement short section, the conducting ring is connected with the temperature measurement bus, and the temperature measurement bus is connected with a temperature measurement module; an outer temperature sensor is installed on the outer side of the temperature measuring nipple, an inner temperature sensor is installed on the inner side of the temperature measuring nipple, a temperature measuring module is installed in the temperature measuring cavity, and the inner temperature sensor and the outer temperature sensor are connected with the temperature measuring module through wires. The temperature measurement module can simultaneously process inner and outer side temperature data measured by the inner temperature sensor and the outer temperature sensor into digital signals with address codes, and transmit the digital signals to a ground special processor through a temperature measurement bus, so that simultaneous measurement of the inner and outer side temperatures of the temperature measurement pup joint is realized; the temperature measuring cavity is filled with the temperature measuring cavity heat insulation material, heat transfer of the inner side and the outer side of the temperature measuring short section can be cut off, the heat insulation effect of the temperature measuring short section is greatly improved, and temperature measuring results of the inner side and the outer side are more accurate. The structural design is suitable for the full-size model design of the temperature measuring short section.

Description

technical field [0001] The invention relates to the technical field of well logging for geothermal energy development, in particular to a short section for temperature measurement of geothermal wells. Background technique [0002] Geothermal energy is a kind of clean and renewable energy. At present, the closed circulation heat exchange technology in the well formed by installing the buried tube heat exchanger breaks through the problems of limited floor space in the shallow layer and difficulty in taking and recharging the water for the deep hydrothermal type. New mainstream technology for mid-deep geothermal energy development. [0003] The medium-deep heat exchange technology mainly transfers heat through the contact between the external heat exchanger and the rock and soil mass, the built-in thermal insulation inner tube is used to output heat and fluid, and the energy is transferred through the heat exchange station to form a cycle. The fluid in the heat exchanger, the ...

AI Technical Summary

Problems solved by technology

At present, the temperature measurement technology for medium-deep geothermal wells with a depth greater than 2000m is still immature, and there are many failure cases, mainly because the process of installing the temperature measurement system in the underground is complicated, and the temperature measurement cable placed outside the pipe wall is in contact with the surrounding rock mass during the lowering process. , Collision friction on the side wall of the annulus and uneven force when the downhole pipeline is connected, which will easily cause damage to the temperature measurement cable, which will lead to the failure of the installation of the geothermal field monitoring system and the inability to complete the geothermal field temperature monitoring work

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