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A kind of downhole fiber optic manometer and downhole pressure measurement method

A measurement method and downhole pressure technology, which is applied in measurement, wellbore/well components, earthwork drilling and production, etc., and can solve problems such as complex structure, low precision, and poor stability

Inactive Publication Date: 2017-01-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of existing pressure monitoring instruments such as complex structure, difficult construction, low precision, poor stability, electrified operation, large fluctuations by the light source, and unusable conventional pressure gauges in high-temperature, high-pressure, and high-corrosion environments, and provides A downhole optical fiber pressure gauge and downhole pressure measurement method

Method used

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  • A kind of downhole fiber optic manometer and downhole pressure measurement method
  • A kind of downhole fiber optic manometer and downhole pressure measurement method
  • A kind of downhole fiber optic manometer and downhole pressure measurement method

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Experimental program
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specific Embodiment approach 1

[0040] Embodiment 1: A downhole optical fiber pressure gauge of this embodiment includes:

[0041] Shell 1, central tube 2, sealing ring I3-1, sealing ring II3-2, upper connector 4, lower connector 5, grating I6, optical fiber coil 7, grating II8, armored optical cable 9 and demodulation device 10;

[0042] The shell 1 is coaxial with the central tube 2 and wraps the lower part of the central tube 2 through threaded connection. The lower end of the central tube 2 is fixed with four axial sealing rings I3-1 and sealing ring II3-2. The upper end of the central tube 2 is Four axial sealing rings I3-1 and sealing ring II3-2 are fixed, the top end of the center pipe 2 is threadedly connected with the upper joint 4 with pipe taper threads, and the bottom end of the center pipe 2 is connected with the upper joint 4 with pipe taper threads. The lower joint 5 of the thread is connected by threads, and the armored optical cable 9 passes through the side hole on the left side of the uppe...

specific Embodiment approach 2

[0050] Embodiment 2: This embodiment differs from Embodiment 1 in that: the grating I6 and the grating II8 are gratings with identical parameters, and the parameters include: central wavelength, reflectivity and grating period.

[0051] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0052] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the optical fiber coil 7 is wound around the central tube 2N turns, and the grating I6, the optical fiber coil 7, and the grating II8 together form a fiber grating Fabry-Perot cavity, and the grating I6 and grating II8 are equivalent to the reflectors of the Fabry-Perot cavity, and the length of the fiber coil 7 is the length of the Fabry-Perot cavity.

[0053] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides an underground optical fiber pressure gage and an underground pressure measurement method, and relates to an optical fiber pressure gage and an underground pressure measurement method. The underground optical fiber pressure gage and the underground pressure measurement method aim at solving the problems of the existing pressure monitoring instrument that the structure is complicated, the construction difficulty is high, the accuracy is low, the stability is poor, the hot-line operation is performed, the fluctuation caused by light sources is large, and the conventional pressure gage cannot be used under the high-temperature, high-pressure and high-corrosion environments. The underground optical fiber pressure gage comprises an outer casing, a center pipe, a sealing ring I, a sealing ring II, an upper joint, a lower joint, a grating I, an optical fiber coil, a grating II, an armored cable and demodulation equipment. The underground pressure measurement method is characterized in that the fluid will generate the action of pressure on the cross section of the center pipe when the fluid flows through the center pipe, the stress is generated in the center pipe in the radial direction, the strain is generated in the center pipe by the stress in the radial direction, the reflective light intensity of an optical fiber grating Fabry-Perot is changed, and finally the pressure is measured by the demodulation equipment on the ground. The underground optical fiber pressure gage and the underground pressure measurement method are applied to the field of petroleum logging.

Description

technical field [0001] The invention relates to the field of petroleum logging, in particular to an optical fiber pressure gauge and a downhole pressure measurement method. Background technique [0002] In the process of exploration and development of oil and gas wells, production personnel need to continuously perform dynamic tests of various oil and gas reservoirs, monitor and measure formation pressure parameters of oil and gas reservoirs in real time, and accurately evaluate oil field productivity based on these parameters to optimize the evaluation of oil field productivity method, determine a reasonable development plan, and safe production. Since 2008, the process of my country's petroleum industry has developed rapidly. In order to increase oil production, various large and small oilfields have started research work on the re-exploitation of old oilfields. Some of the technological measures such as fracturing, acidizing, The specific situation of the improvement of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
Inventor 张洪涛宋文平李隆球刘丽丽何俊张广玉王长利
Owner HARBIN INST OF TECH