The accurate location of multi-phase medium interfaces in the water-soluble cavity of salt cavern gas storage

Xianjian Zou, Tongtao Wang, Chunhe Yang, Hao Zhang and Duocai Wang

Energy, 2025, vol. 326, issue C

Abstract: The large-scale construction of water-soluble cavities is a crucial aspect of national energy strategic reserves and emergency regulation of oil and gas. A significant technical challenge arises when attempting to locate the interface of a multiphase oil-gas-water medium in a salt cavity well during the construction of a salt cavern gas storage. To address this, an accurate location method of medium interfaces is proposed based on a distributed optical fiber temperature sensing (DTS) technique. After suitably heating the armored composite optical cable, the heating-up temperature-distance data is analyzed using both a local weighted regression algorithm and a Kalman filtering algorithm. Results indicate that precise location of the oil-brine interface in the cavity can be achieved using the temperature trend curve and filtering algorithms. The detection precision can be increased to within 0.5m in actual application, as verified by the neutron tracer logging method in a salt cavity. This method and its accompanying device can provide more reliable data support for detecting underground multiphase medium interfaces in oil-gas well engineering, thereby ensuring the construction safety of water-soluble cavities.

Keywords: Salt cavity well; Multi-phase medium; Interface detection; Distributed optical fiber; Water-soluble cavity (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:326:y:2025:i:c:s0360544225019656

DOI: 10.1016/j.energy.2025.136323

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