Heat preservation device of downhole well logging instrument

Abstract

The invention provides a heat preservation device of a downhole well logging instrument. The heat preservation device comprises a circuit framework and a heat preservation bottle. The heat preservation bottle comprises a liner and connectors, the connectors are respectively welded at the upper end and the lower end of the liner, and a gland is connected onto each connector; the circuit framework comprises an upper heat absorption assembly, a middle heat absorption assembly and a lower heat absorption assembly which are sequentially arranged from top to bottom, the upper heat absorption assembly is connected with the middle heat absorption assembly by a fixing framework, the middle heat absorption assembly is connected with the lower heat absorption assembly by a fixing framework, and heat-insulation end covers are respectively arranged between the upper heat absorption assembly and the corresponding gland and between the lower heat absorption assembly and the corresponding gland; one end of each heat-insulation end cover is butted to the corresponding gland, the other end of each heat-insulation end cover extends into the liner, and wire through holes are formed in the heat-insulation end covers. The heat preservation device has the advantages that the internal temperature of the internal heat preservation bottle can keep lower than high temperatures of the outside of the heat preservation bottle for a long time, accordingly, requirements of circuits in the heat preservation bottle on environmental temperatures can be met, and the downhole well logging instrument can be assuredly stably and reliably used for a long time.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency thermal insulation of well logging downhole instruments, and in particular relates to a thermal insulation device of well logging downhole instruments. Background technique [0002] At present, in the petroleum exploration well logging industry, in order to enable the downhole logging instrument to work normally for a long time in the high temperature environment downhole, the instrument core equipped with electronic circuit devices is usually placed in a stainless steel inner and outer core. In the vacuum thermos bottle device of the gallbladder, the heat of the formation is isolated to prevent the heat from being transmitted from the outside of the thermos bottle into the circuit of the instrument core inside, and to protect the electronic circuit that is not resistant to high temperature. In order to meet the requirements of the protected instrument circuit for the working temperature i...

AI Technical Summary

Problems solved by technology

[0009] In view of this, the present invention aims to propose a thermal insulation device for logging downhole instruments, which solves the problem that the heat generated by the circuit board of the downhole instrument in the prior art can only be transferred to the phase in the heat absorbing body in the form of heat radiation and heat conduction. The problem of heat transfer by variable matter, low heat transfer efficiency, and poor heat absorption effect has also greatly improved the heat insulation performance of the thermos bottle

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