Distortion Influence on Cavern Volume of Jintan Salt Cavern Gas Storage

doi:10.11885/j.issn.1674-5086.2020.10.09.02

Abstract

Abstract: Jintan salt cavern gas storage is constructed in layered salt rock. In the construction, the cavern distortion and leaching often occur, which seriously reduce the effective volume of salt cavern. It is helpful to increase the gas storage capacity by studying its influence on the cavern volume and controlling the leaching method. Based on the actual condition of Jintan salt cavern gas storage, the influence of cavern distortion, partial leaching and sump shape on the effective volume was analyzed. The results show that the distorted and partially-leaching caverns account for about 30% of the total number, the distortion coefficient ranges between (11.8~90.1)×10^-3, and the larger the distortion coefficient, the lower the utilization rate of salt layer; the cross-section of salt cavern is elliptical, and the diameter of cavern varies greatly with different depth, which reduces the utilization rate of salt layer around the cavern; partial leaching reduces the pillar width between adjacent caverns as well as the ratio, so the diameter of cavern is limited, and the cavern volume is seriously reduced; the sump can be divided into "V", "-", " \" and "A" shapes, and the brine discharge efficiency decreases in turn. The last two kinds are the most unfavorable for cavern space utilization and seriously reduce gas storage volume. For the cavern distoration, the means includes reducing the displacement, using positive circulation, natural gas dissolution inhibition technology. For partial leaching, measures such as predicting the direction of partial leaching and reasonably designed well location, reducing P/D and increasing the diameter of cavern can be adopted. There are no effective measures to control the sump deformity and improve the brine discharge efficiency. The research gives a theoretical foundation for the cavern shape control and the improvement of cavern volume, which is helpful to the construction of Jintan salt cavern gas storage.

Key words: Jintan salt cavern gas storage, distortion, leaching preferentially, sump shape, effective volume

CLC Number:

TE822

WANG Jianfu, BA Jinhong, WANG Wenquan. Distortion Influence on Cavern Volume of Jintan Salt Cavern Gas Storage[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(6): 105-113.

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