A method and system for measuring gas-liquid interface of salt cavern gas storage based on sound velocity difference

Abstract

The invention discloses a method and system for measuring the gas-liquid interface of a salt cavern gas storage based on the sound velocity difference, belonging to the field of salt cavern gas storage. Including: the solid-state acoustic wave transmitting device and the space acoustic wave transmitting device simultaneously transmit sound wave signals; measure the time difference between the solid-state acoustic wave receiving device and the space acoustic wave receiving device receiving the corresponding sound wave signal; determine the time difference and the distance between the sound wave transmitting device and the sound wave receiving device The distance between the gas-liquid interface and the space acoustic wave generator. Using the acoustic signal as the ranging signal, using the different velocities of the acoustic signal in solid, liquid, and gas to achieve the purpose of ranging, compared with using optical signals for ranging, it is more resistant to oil pollution and can achieve higher measurement accuracy. Two acoustic signals of different frequencies are used as the ranging signal, which effectively reduces the attenuation of the acoustic wave during propagation, and at the same time avoids the mutual interference between the signals, further improves the measurement accuracy, and can realize real-time continuous measurement of the gas-liquid interface. Measurement.

Description

technical field [0001] The invention belongs to the technical field of construction and use of salt-cavern gas storage, and more specifically relates to a method and system for measuring the gas-liquid interface of a salt-cavern gas storage based on sound velocity difference. Background technique [0002] The construction of the salt cavern gas storage is to dissolve the salt production well or the newly drilled hole by injecting fresh water, discharge the brine from the drainage pipe, and inject a certain spacer fluid through the gap between the water injection pipe and the casing to avoid the formation of the salt cavern vault. top dissolution; during the above period, parameters are continuously adjusted according to the technical parameters such as the height of the gas-liquid interface and the amount of salt produced, so as to achieve the geometric shape and volume of the target underground salt cavern. In this process, the liquid level measurement of the gas-liquid int...

AI Technical Summary

Problems solved by technology

[0004] In view of the existing technology, the salt cavern gas storage during the construction process and after being put into use is relatively harsh and the oil pollution is heavy. Using laser ranging, the lens is easily polluted by oil pollution, resulting in low measurement accuracy and short service life. To solve the problem that the depth of the gas-liquid interface in salt caverns cannot be accurately measured, the present invention provides a method and system for measuring the gas-liquid interface of salt cavern gas storage based on the difference in sound velocity. Acoustic signals have different velocities in solids, liquids, and gases to achieve the purpose of distance measurement and achieve higher measurement accuracy

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