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Downhole Quartz Resonant Pressure Sensor

A pressure sensor and resonator technology, which is applied in elastic deformation meter-type fluid pressure measurement, fluid pressure measurement using piezoelectric devices, etc. The effect of reducing vibration damping, easy vibration and low cost

Inactive Publication Date: 2017-11-03
YICHUN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an underground quartz resonant pressure sensor. The main technical problems to be solved are: the traditional quartz resonant pressure sensor has complex structure, difficult processing and high cost, and the electrode part of the vibrator is exposed to the test environment. When the cylinder confining pressure medium contains electrolyte components, the output amplitude of the sensor will be reduced, and in severe cases, it will not work; the sensor is protected with a metal cylinder with a pressure transmission hole, and the capillary is filled with pure silicon oil to isolate the well fluid The way to suppress the decrease of the output amplitude of the sensor will bring a lot of inconvenience to the field use

Method used

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Experimental program
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Effect test

Embodiment 1

[0026] The present invention provides a downhole quartz resonant pressure sensor, which includes a cylindrical shell 1, a quartz crystal resonator 2 and a bracket 3 arranged in the shell 1, the quartz crystal resonator 2 is embedded in the In the bracket 3, the bracket 3 is fixedly installed in the housing 1; the center of one end of the housing 1 is preset with a screw hole, and a threaded connection is inserted in the screw hole for adjusting the preload. The fine-tuning screw 11 of force, the fine-tuning screw 11 is tightly connected with the screw hole, the other end of the housing 1 is provided with a pressure detection window, and the elastic metal diaphragm 4 is installed in the pressure detection window , the elastic metal diaphragm 4 is provided with a boss 41 corresponding to the center of one side of the housing 1; the quartz crystal resonator 2 is an open ring with a fifth-order harmonic thickness shear vibration mode Chip 4.992MHz quartz crystal resonator, the cut...

Embodiment 2

[0028] Embodiment 2: As mentioned above, a vacuum conduit 5 is sealed and inserted in the side wall of the end of the screw hole on the casing 1, and the vacuum conduit 5 is sealed at the end corresponding to the outside of the casing 1. The degree of vacuum in the housing 1 is 6×10 -1 Pa, when this embodiment is actually implemented, after the present invention is assembled, one end of the vacuum conduit 5 corresponding to the outside is connected to an external vacuuming device, and the vacuum degree in the housing 1 reaches 6×10-1Pa Finally, clamp the vacuum conduit 5 flat, and cut off the vacuum conduit 5 at the outer end at a distance of 3 to 5 mm from the clamp flat, and use high-temperature solder to completely seal the section. This structure is convenient for vacuuming, simple in structure, and easy to assemble Finishing is relatively easy.

Embodiment 3

[0029] Embodiment 3: Further, two locking keys 31 are protruded from one end of the support 3 corresponding to the axial end of the quartz crystal resonator 2 in the shape of an open ring, and the two locking keys 31 are respectively stuck on the The quartz crystal resonator 2 in the shape of an open ring is on both sides of the end face of the axial end, and the two keys 31 correspond to the radial direction of the housing 1 respectively. This arrangement structure is beneficial to all The position of the quartz crystal resonator 2 is fine-tuned and aligned during the assembly process. An annular gasket 32 ​​is arranged at the other end of the bracket 1 corresponding to the axial direction of the quartz crystal resonator 2 in the shape of an open ring. The quartz crystal resonator 2 is embedded between the two snap keys 31 and the ring spacer 32, and the structure of the bracket 3 can effectively suspend the quartz crystal resonator 2 on the housing 1 , to prevent the quartz ...

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Abstract

A downhole quartz resonant pressure sensor, which includes a cylindrical housing, a quartz crystal resonator and a bracket arranged in the housing, the quartz crystal resonator is embedded in the bracket, and the bracket is fixedly installed in the housing; the housing There is a screw hole in the center of one end of the housing, and a fine-tuning screw is inserted into the screw hole. The other end of the housing is provided with a pressure detection window. The pressure detection window is sealed with an elastic metal diaphragm. Corresponding to the center of one side of the shell, there is a convex column; the quartz crystal resonator is an open ring sheet-shaped 4.992MHz quartz crystal resonator with a fifth-order overtone thickness shear vibration mode, and a quartz crystal resonator is welded on it. For the sealed lead-out ends of the electrodes passing through the shell; the corresponding ends of the fine-tuning screw and the protruding post are respectively inserted into the bracket, and the force-sensitive points of the quartz crystal resonator are in contact with the corresponding end faces of the fine-tuning screw and the protruding post respectively.

Description

technical field [0001] The invention relates to the field of pressure sensors, in particular to a downhole quartz resonant pressure sensor used for oil well pressure measurement in the field of oil exploitation. Background technique [0002] Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electric power, ships, machine tools , pipeline and many other industries. There are many types of pressure sensors and their application fields are extremely wide, but there are only a handful of sensors that can be used for downhole pressure measurement in oil fields. Due to the high pressure, high temperature, serious well fluid erosion and harsh working conditions of oil wells, the requirements for pressure sensors a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L7/08G01L9/08
Inventor 陈敏
Owner YICHUN UNIVERSITY
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