Online deep dynamic level-temperature measuring system for geothermal well

Abstract

The invention relates to an online deep dynamic level-temperature measuring system for a geothermal well, a temperature sensor arranged in the geothermal well is connected as a singlechip. One end of a platinum nickel chrome ferroalloy wire arranged in the geothermal well is connected with a constant flow source while the other end thereof is connected with a digital to analog converter. The constant flow source is connected with a constant flow source switch time controller and the digital to analog converter and the constant flow source switch time controller are connected with the singlechip. The platinum nickel chrome ferroalloy wire has positive temperature coefficient and great thermal response speed. A constant flow is introduced to the platinum nickel chrome ferroalloy wire under control of the constant flow source switch time controller so that temperature change, resistance change and voltage variation in the upper and lower parts of the platinum nickel chrome ferroalloy wire are different because the thermal resistance of air is far greater than that of liquid. Therefore, level variation can be measured through the digital to analog converter, the temperature sensor and the singlechip and actual liquid and temperature of liquid can be measured through calibration and least square regression.

Description

technical field [0001] The invention belongs to a dynamic measurement system, in particular to an online geothermal water well depth dynamic liquid level-temperature measurement system. Background technique [0002] The significance of online deep dynamic liquid level-temperature measurement of geothermal wells is to protect the normal operation of submersible electric pumps and avoid damage to submersible electric pumps due to air pumping. More importantly, it is to monitor the liquid level data of geothermal wells for a long time to provide for the balance of recharge. reliable data. [0003] At present, the liquid level gauge of the water measuring well generally adopts the manual or servo motor off-line method, which cannot achieve the purpose of online measurement. The liquid level measurement based on the principle of silicon pressure sensor is used because of the bending of the long-distance atmospheric conduit, which makes the long-distance measurement 200- The liqu...

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Problems solved by technology

[0003] At present, the liquid level gauge of the water measuring well generally adopts the manual or servo motor off-line method, which cannot achieve the purpose of online measurement. The liquid level measurement based on the principle of silicon pressure sensor is used because of the bending of the long-distance atmospheric conduit, which makes the long-distance measurement 200- The wide dynamic range of 300 meters and the liquid level change of 80 meters cannot be realized. Even if it is realized, the diameter of the sensing wire is very large due to the diameter requirement of the air duct

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