Salt cavern gas storage gas-liquid interface measuring method and system based on sound velocity difference

Abstract

The invention discloses a salt cavern gas storage gas-liquid interface measuring method and system based on sound velocity difference, and belongs to the field of salt cavern gas storage. The method comprises the steps that a solid sound wave transmitting device and a space sound wave transmitting device transmit sound wave signals at the same time; the time difference of the corresponding sound wave signals received by a solid sound wave receiving device and a space sound wave receiving device is measured; and the distance between the gas-liquid interface and a space sound wave generating device is determined according to the time difference and the distance between the sound wave transmitting device and the sound wave receiving device. The sound signals are used as distance measuring signals, the distance measuring purpose is achieved by utilizing the property that the speeds of the sound signals in solid, liquid and gas are different, and compared with distance measurement through optical signals, the oil stain tolerance is higher, and higher measuring precision can be achieved. Two sound signals with different frequencies are used as distance measurement signals, the attenuation of sound waves in the propagation process is effectively reduced, mutual interference between the signals is avoided at the same time, the measurement precision is further improved, and real-time continuous measurement of the gas-liquid interface can be achieved.

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...

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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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