Salt-cavern gas storage liquid level measuring system and method based on Poynting vector detection

Abstract

The invention relates to a salt-cavern gas storage liquid level measuring system and method based on Poynting vector detection. The system comprises a central pipe, an electromagnetic signal transmitting device, electric field measuring devices, a magnetic field measuring device and a ground host. The central pipe is inserted into a salt-cavern gas storage from a wellhead; the electromagnetic signal transmitting device is arranged on the central pipe; the two electric field measuring devices are respectively arranged on the upper side and the lower side of the electromagnetic signal transmitting device; and the magnetic field measuring device is arranged below the lower electric field measuring device. The electromagnetic signal transmitting device excites an electric field and a magnetic field in a space, and the electric field measuring devices and the magnetic field measuring device measure the electric field and the magnetic field in the space. The ground host calculates the distance between the liquid level and the electromagnetic signal transmitting device through the measured electric field intensity and magnetic field intensity. The scheme can adapt to the severe environment in the gas storage, and the gas-liquid interface height in the gas storage can be accurately measured.

Description

technical field [0001] The invention relates to the technical field of construction and use of a salt cavern gas storage, in particular to a liquid level measurement system and method for a salt cavern gas storage based on Poynting vector detection. Background technique [0002] Salt cavern gas storage is constructed by injecting fresh water into salt mining wells or newly drilled holes, and the dissolved cavity formed by dissolving fresh water into salt deposits is used for gas storage, and the brine is discharged through drainage pipes. During this process, it is necessary to continuously adjust the plan according to technical parameters such as liquid level height and brine salinity, so that the geometry and volume of the underground salt cavern can meet the design requirements; A certain amount of spacer liquid is injected into the gap between the tubes to prevent the geometry of the salt cavern from being damaged. During the construction and use of salt cavern gas stor...

AI Technical Summary

Problems solved by technology

However, in the process of using the gas storage after its completion, in order to ensure the airtightness of the gas storage, a permanent packer will be used, and the cable device cannot be used. Therefore, this method is only suitable for controlling the liquid level during the construction of the gas storage. take measurements

Patent CN202010262517.3 "A Method and System for Measuring the Liquid Level of an Acousto-optic Synchronous Salt Cavern Gas Storage" discloses a method for measuring the height of the gas-liquid interface of a gas storage based on acoustic wave ranging. The time difference and the propagation speed of sound waves in different media are used to measure the height of the liquid level, which solves the problem that the gas storage cannot use wired cables after completion, but the environment of the gas storage is relatively harsh, there is oil pollution, and the lens of the laser device is easily damaged. Oil pollution reduces the measurement accuracy, and the attenuation of sound waves in the gas is relatively large, which is prone to measurement errors

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