Liquid level measurement system and method for salt cavern gas storage based on Poynting vector detection

Abstract

The present invention relates to a salt cavern gas storage liquid level measurement system and method based on Poynting vector detection. The wellhead is inserted into the salt cavern gas storage; the electromagnetic signal emitting device is arranged on the central pipe; the electric field measuring device includes two, which are respectively arranged on the upper and lower sides of the electromagnetic signal emitting device; the magnetic field measuring device is arranged on the lower side of the electric field measuring device below. The electromagnetic signal transmitting device excites the electric field and magnetic field in the space, and the electric field measuring device and the magnetic field measuring device measure the electric field and magnetic field in the space; the ground host calculates the liquid surface distance through the measured electric field strength and magnetic field strength Electromagnetic signal transmitting device the distance. The scheme can adapt to the harsh environment in the gas storage, and can accurately measure the height of the gas-liquid interface in the gas storage.

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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