Back-leaching Technology in The Construction of Underground Salt Cavern Gas Storage

doi:10.11885/j.issn.16745086.2015.02.24.02

Abstract

Abstract: In order to improve the economic efficiency, the developer always requires to maximize the net volume of the underground gas storage facilities on the premise of operation safety. However,due to geological reasons,engineering failures and inadequate comprehemsion, some salt layers often fail to dissolve during the storage-building process. To make the best use of the increasingly deficient salt formations suitable for underground gas storage facilities, back-leaching can be used to optimize the volume of the gas storage facility. After gas-injection and debrining, fresh water is injected by tubing strings to push the interface of the brine and gas at the designed depth. By doing that the salt formations below the interface can be leached again, which will enlarge the volume of the leached caverns. We established the back-leaching mathematic models and wrote calculation program. The pilot back-leaching in well-L in Jintan project shows the effective volume of the cavern can be raised by 13.04 percent. This research is important for enhancing the efficiency of the use of salt formations and will improve the effective volume of the built caverns.

Key words: salt cavern gas storage, back-leaching, cavity repair, SMUG, numerical simulation

CLC Number:

TE822

LIU Jiqin, JIAO Yujia, LI Jianjun, SHI Xilin. Back-leaching Technology in The Construction of Underground Salt Cavern Gas Storage[J]. 西南石油大学学报(自然科学版), 2016, 38(5): 122-128.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2015.02.24.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2016/V38/I5/122

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