Refrigeration device for downhole instrument

Abstract

The invention provides a refrigeration system for oil exploration downhole equipment, in which a closed system consisting of an upper joint, a metal heat-conducting pressure-bearing joint, and a sealed casing is placed inside a set of electric motors, pressure pumps, condensers, and shut-off tubes. The refrigeration system composed of evaporator and evaporator, the evaporator is placed inside the thermos bottle, the circuit board is placed on the evaporator, and the internal temperature of the thermos bottle is lowered through the evaporator, so that the internal temperature of the thermos bottle is much lower than the temperature of the external high temperature and high pressure mud, and the inside of the thermos bottle Place a heat absorber, once the refrigeration system fails, the internal heat absorber absorbs the heat inside the thermos bottle, and the thermos bottle and insulation asbestos isolate the heat conducted from the outside of the sealed shell, thus ensuring that the internal temperature of the thermos bottle is maintained at a reasonable level within a certain period of time Within the temperature range, the temperature inside the thermos bottle can be monitored in real time through the internal temperature sensor.

Description

technical field [0001] The invention relates to a refrigerating device for an oil exploration downhole instrument, in particular to a refrigerating device for reducing the working temperature of an internal measuring circuit of an oil exploration downhole instrument. Background technique [0002] In the process of petroleum development, it is necessary to use various measuring instruments to measure various physical parameters of the fluid and rock inside the formation, accurately determine the position of the oil layer, and facilitate the extraction of oil. However, the measuring instruments in deep wells must withstand the high-temperature environment in the well, and it is necessary to ensure that the internal measuring circuits of the instruments work normally. [0003] At present, there are various downhole measurement instruments on the market. In order to ensure that the internal measurement circuit works normally, two methods are usually adopted: one method is to pla...

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Problems solved by technology

[0003] At present, there are various downhole measurement instruments on the market. In order to ensure that the internal measurement circuit works normally, two methods are usually adopted: one method is to place the measurement circuit and heat absorber inside the metal thermos bottle, and the internal temperature of the thermos bottle will As the temperature rises, the endothermic agent vaporizes, thereby absorbing heat, to reduce various internal temperatures, but this method is limited by the working time. Once the endothermic agent is completely vaporized after a certain period of time, the internal temperature of the thermos bottle will no longer decrease, but with the extension of time, the temperature inside the thermos bottle rises

Another way is to use high-temperature electronic devices to make circuits, which are directly exposed to high-temperature environments. Thermos bottles and heat absorbers are not suitable, but this method is too costly, and some electronic devices cannot withstand high temperatures, which limits the function of measuring instruments. application

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