Multi-point temperature measurement method and temperature measurement equipment for down-hole formation

Abstract

The invention provides an underground formation multipoint temperature measurement method which includes the following steps: setting a plurality of armored thermocouples, one end of which are connected with compensating wires; choosing one protection tube, the wall of which is provided with fixing holes formed at intervals along the axle direction according to the detecting points; penetrating the compensating wires connected with armored thermocouples in the protection tube and then out from the tube mouth, and limiting and fixing the protection lining of the armored thermocouples at the fixing holes; connecting the compensating wires out of the tub mouth with a multi-channel temperature measurement instrument display; extending the protection tube with the armored thermocouples into a well; and measuring the temperature. Formation temperatures at different depths can be measured by the method using only one pipeline; the armored thermocouples are fixed at the fixing holes of the tube wall that contacting outside directly, thus guarantee the high measurement precision; and the thermocouples with metal armor are not easy to be damaged during assembly, thus greatly prolonging the service time.

Description

technical field [0001] The invention relates to a temperature measuring method, in particular to a method for measuring the temperature at different depths of underground formations and temperature measuring equipment for implementing the temperature measuring method. Background technique [0002] Ground source heat pump deep wells, oil production wells, mines, etc. all need to detect the formation temperature at different depths. In the existing technology, the formation temperature is mainly measured by drilling holes on the surface, and then inserting a protection tube with a thermocouple. The pair is connected to a display instrument through a compensation line to directly display the temperature at different depths of the formation. The existing temperature measurement methods mainly include three forms: [0003] (1) Separately insert protective tubes provided with thermocouples at different depths; this method has a large investment, and each time the formation tempera...

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Problems solved by technology

[0003] (1) Separately insert protective tubes provided with thermocouples at different depths; this method has a large investment, and each time the formation temperature of a depth is measured, a new hole must be drilled, and a protective tube is inserted separately, resulting in a large amount of manpower and material resources waste;

[0004] (2) Set a thermocouple at every certain depth in the same protection tube to measure the formation temperature at different depths; Both are sealed and installed in the protection tube, and are not in contact with the formation, so the measured temperature is only the temperature at each depth in the protection tube, and the measurement error is large

[0005] (3) Bind the thermocouple on the outside of the casing; this does achieve direct contact between the thermocouple and the ground surface, but the disadvantages are also obvious: because the thermocouple is exposed to the outside, it brings problems such as easy damage to the installation and short service life

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