Method and system for measuring gas-liquid interface of salt-cavern gas storage based on low-frequency electrical signal

A gas-liquid interface, electrical signal technology, applied in the direction of the liquid level indicator for the measurement of physical variables, can solve the problems of measurement error, the measurement method is easily affected by the environment, etc., to achieve long service life, less interference in use, and reduce the number of replacements Effect

Active Publication Date: 2022-05-13
HUAZHONG UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the existing gas-liquid interface measurement method of salt-cavern gas storage is easily affected by the environment and has measurement errors, in the first aspect of the present invention, a method for measuring the gas-liquid interface of salt-cavern gas storage based on low-frequency electrical signals is provided. Including: installing the insulating pup joint at the joint of the two sections of the central tube, installing the excitation source on the outer wall of the insulating pup joint, and the positive and negative poles of the excitation source are respectively connected to the center tube above the insulating pup joint and the center below the insulating pup joint. The outer wall of the tube is connected; the voltage measuring device is installed on the outer wall of the central tube under the insulating short joint, and is located above the highest height of the gas-liquid interface; the excitation source applies a low-frequency current signal to the central tube; measure the voltage of the central tube under the insulating joint , and calculate the impedance Z of the lower end of the insulation nipple according to the low-frequency current signal 下 ;According to the low-frequency current signal, the central tube voltage under the insulating pup and the impedance Z of the lower end of the insulating pup 下 The definition of the calculation equation to determine the distance H between the insulating pup and the gas-liquid interface; according to the impedance Z of the lower end of the insulating pup 下 and the calculation equation, calculate the distance H between the insulating pup joint and the gas-liquid interface

Method used

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  • Method and system for measuring gas-liquid interface of salt-cavern gas storage based on low-frequency electrical signal
  • Method and system for measuring gas-liquid interface of salt-cavern gas storage based on low-frequency electrical signal

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Embodiment 1

[0031] refer to figure 1 , in the first aspect of the present invention, a method for measuring the gas-liquid interface of a salt cavern gas storage based on low-frequency electrical signals is provided, including: S100. Install the insulating puppet at the junction of two sections of central pipe, and install the excitation source on the insulating On the outer wall of the pup joint, and the positive and negative poles of the excitation source are respectively connected to the outer wall of the central tube above the insulating pup joint and the outer wall of the central tube below the insulating pup joint; the voltage measuring device is installed on the outer wall of the central tube below the insulating pup joint, And it is located above the highest height of the gas-liquid interface; S200. The excitation source applies a low-frequency current signal to the central tube; S300. Measure the voltage of the central tube under the insulating pup, and calculate the impedance Z o...

Embodiment 2

[0068] The second aspect of the present invention provides a gas-liquid interface measurement system for salt cavern gas storage based on low-frequency electrical signals, including: a central pipe, an insulating pup, an excitation source, a voltage measuring device, and a computing device. The insulating pup is installed At the junction of the two sections of central pipe; the excitation source is installed on the outer wall of the insulating pup, and its positive and negative poles are respectively connected to the outer wall of the central pipe above the insulating pup and the outer wall of the central pipe below the insulating pup. The central tube applies a low-frequency current signal I; the voltage measuring device is installed on the outer wall of the central tube under the insulating sub, and is located above the highest height of the gas-liquid interface, and is used to measure the central tube voltage U under the insulating sub 下 ; The computing device is connected t...

Embodiment 3

[0075] A third aspect of the present invention provides an electronic device, including: one or more processors; a storage device for storing one or more programs, when the one or more programs are used by the one or more The processor executes, so that the one or more processors implement the method provided by the first aspect of the present invention.

[0076] Specifically, refer to Figure 7 , the electronic device 500 may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 501, which may be loaded into a random access memory (RAM) 503 according to a program stored in a read-only memory (ROM) 502 or loaded from a storage device 508 Various appropriate actions and processing are performed by the programs in the program. In the RAM 503, various programs and data necessary for the operation of the electronic device 500 are also stored. The processing device 501 , ROM 502 and RAM 503 are connected to each other through a bus 504 ...

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Abstract

The invention relates to a method and system for measuring the gas-liquid interface of a salt cavern gas storage based on low-frequency electrical signals. The method includes: applying a low-frequency current signal to the central tube by an excitation source; Calculate the impedance Z of the lower end of the insulation pup joint 下 ;According to the low-frequency current signal, the central tube voltage under the insulating pup and the impedance Z of the lower end of the insulating pup 下 The definition of the calculation equation to determine the distance H between the insulating pup and the gas-liquid interface; according to the impedance Z of the lower end of the insulating pup 下 and the calculation equation to calculate the distance H between the insulating pup joint and the gas-liquid interface. The present invention utilizes the property that the characteristic impedance of the central pipe is much larger than that of the salt water to realize the measurement of the gas-liquid interface of the salt cavern gas storage, and is not easily affected by the oily environment and sound wave propagation attenuation; the measurement system provided by the present invention is recyclable, and is The use of the salt cavern gas storage has less interference and good working stability, effectively reducing the number of replacements of downhole equipment.

Description

technical field [0001] The invention belongs to the field of salt-cavern gas storage measurement, and in particular relates to a method and system for measuring the gas-liquid interface of a salt-cavern gas storage based on low-frequency electrical signals. Background technique [0002] In recent years, my country's natural gas consumption has grown rapidly, showing a trend of short supply. In order to reduce the peak load of natural gas pipelines and ensure the flexibility and reliability of natural gas supply, the construction of underground gas storage in major consumption areas along natural gas trunk lines has become the mainstream method to ensure the peak-shaving supply of natural gas. There are three main types of underground gas storage: depleted gas reservoir type, aquifer type and salt cavern type. As the name implies, a salt cavern refers to an underground cavity formed by dissolving salt rock in a salt-bearing formation or a salt dome by injecting a solvent suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/22
CPCG01F23/22
Inventor 田若言李彦倪谢霆高子涵付正坤陈庆李红斌
Owner HUAZHONG UNIV OF SCI & TECH
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