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| Study on single-well retreating leaching technology and multi-field coupling theory of horizontal storages in salt deposits |
| LIANG Weiguo1，2，XIAO Ning1，2，LI Ning1，2，ZHAO Yangsheng1，2，YANG Haijun3，DUSSEAULT Maurice4 |
(1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of
In-situ Property-improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；3. Gas Storage Project Department，PetroChina West-to-East Gas Pipeline Company，Zhenjiang，Jiangsu 212100，China；4. Civil and Environmental Engineering，University of Waterloo，Waterloo N2L 3G1，Canada)
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Abstract Compared with vertical storages，building horizontal storages in bedded salt rock deposits can avoid connecting bedded interlayers and interfaces and reduce stored oil and gas leakage risks. In this paper, the technical background and construction technique of the single-well retreating horizontal leaching method are presented, and the horizontal storage group construction schemes of single-layer star type and multi-layer staggered arrangement are presented. Based on the established multi-field coupling theory of solid-fluid-heat-mass transfer，a numerical simulation of the construction process of the single-well retreating horizontal leaching method is performed. The results show that with the help of geo-steering technology in petroleum exploration and the single-well retreating horizontal leaching method，large-scale horizontal storage groups can be built in layered salt rock deposits，greatly improving China¢s energy storage capacity. According to the multi-layer star-shaped dislocation arrangement，the net volume of a group of storages in the two-layer salt rock layer can reach more than 1.36×107 m3. To ensure the stability of the horizontal cavern and the maximum utilization of the salt rock space，in the design stage of the gas storage，the pipe string system should be arranged in the lower layer of the horizontal salt rock layer as far as possible under the premise of ensuring the reliability and airtightness of the cavern. It is also important to control the excessive upward expansion of the cavern through oil or gas injection in the leaching process. The research results can provide a technical reference for constructing domestic salt rock gas storage projects and effectively promote the construction of China¢s gas storage.
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2021, Vol. 40 
