A sealing method and structure of a temperature sensor interface

A temperature sensor and interface technology, which is applied in the field of sealing of downhole equipment and instruments in natural gas fields, can solve the problems of poor long-term sealing reliability, inconvenient maintenance and replacement, and easy corrosion of weld seams, so as to prevent thermal expansion and contraction and excessive leakage loss , the effect of rapid temperature sensing

Active Publication Date: 2018-08-07
贵州航天凯山石油仪器有限公司
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Problems solved by technology

[0005] The object of the present invention is to provide a sealing method and structure of a temperature sensor interface to solve the problems of poor manufacturability, easy corrosion of weld seams and inconvenient maintenance and replacement in the prior art. , poor long-term sealing reliability and other technical problems

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  • A sealing method and structure of a temperature sensor interface

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Embodiment

[0021] This example figure 1 As shown, during specific implementation, a temperature-sensing window 7 can be processed on the outer surface of the casing 3 of the downhole instrument, and an interface for installing the temperature sensor 1 can be processed at the bottom of the temperature-sensing window 7, and a threaded hole is processed in the inner hole of the interface. And the light hole, a section of light hole near the inner surface of the housing 3, and a section of threaded hole near the outer surface of the housing, in which the temperature sensor 1 and the liquid storage shell 4 are installed. A discharge sleeve 6 is installed in the inner hole at the top of the liquid storage case 4, and a spiral groove 8 is processed on the outer circle of the discharge sleeve. An interference fit is adopted between the inner hole of the liquid storage shell 4 and the outer circle of the discharge sleeve 6, and the circular seams of the end faces are spot-welded 9 to prevent the ...

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Abstract

The invention discloses a sealing method and structure of a temperature sensor interface. In the present invention, the temperature-sensing end of the temperature sensor is extended out of the housing so that the temperature-sensing end of the temperature sensor is directly in contact with the downhole test medium to increase the temperature sensing speed of the instrument; in order to prevent the downhole test medium from passing through the connection between the temperature sensor and the housing The gap enters the shell. This method adopts the structure of the combination of sealing ring and mineral oil double seal to improve the reliability of the seal; A cavity is formed outside the connecting gap, and mineral oil is injected into the cavity to form a mineral oil sealing segment. The invention uses mineral oil to isolate the contact between the gas well environment medium and the sealing ring on the temperature sensor, which can prevent premature aging of the sealing ring, prevent natural gas from entering the instrument through the rubber sealing ring, damage the internal circuit of the instrument or cause safety hazards.

Description

technical field [0001] The invention relates to a sealing method and structure of a temperature sensor interface, and belongs to the technical field of sealing of downhole equipment and instruments in natural gas fields. Background technique [0002] When carrying out pressure testing on natural gas fields, it is necessary to test the downhole temperature at the same time, so a temperature sensor is installed on the gas well pressure gauge. In order to ensure that the gas well pressure gauge is not eroded by downhole gas, the entire gas well pressure gauge is sealed. Therefore, the traditional method is to install the temperature sensor inside the gas well pressure gauge. Since the temperature sensor cannot be in direct contact with the test medium, there is a flow pressure test. The problem of temperature lag. [0003] In order to obtain real-time temperature, the probe part of the temperature sensor must be in direct contact with the test medium. At present, there are two...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/07E21B47/06F16J15/16F16J15/06
Inventor 冯贵洪汪开义龙先明
Owner 贵州航天凯山石油仪器有限公司
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