Key Technology and Application of Reconstruction of Existing Brine Extraction Caverns into Salt Cavern Gas Storage

doi:10.3969/j.issn.1006-6535.2021.05.019

Abstract

Abstract: In order to reconstruct the existing brine extraction caverns in convection well into underground gas storage, the experience of the reconstruction of existing brine extraction caverns into salt-cavern gas storage was summarized, its applicability in the reconstruction of brine extraction caverns in convection well into gas storage was analyzed, the more accurate basic conditions and the calculation formula of sealing test pressure were determined for reconstruction, and the qualification evaluation conditions, the improved test method for numerical simulation method in stability analysis, the new technology for wellbore reconstruction and the technical requirements of the operation were given. The study results were applied to the reconstruction of the old caverns in Huaian Area, and the selected convection well met the reconstruction conditions; the pressure change in the injection well was 3.258 to 3.478 MPa during the sealing test with 10 injection pressure ramps, and the wellhead pressure and leakage decreased significantly, satisfying the gas storage conditions; the construction plan of sealing the old well and drilling another new well was determined, and the production casing size was 244.5 mm; a pressure test was conducted at a pressure 1.1 times the upper limit of operating pressure of the gas storage. The results of the study are of guidance to the reconstruction of a large number of existing brine extraction caverns of convection wells in domestic salt mines.

Key words: convection well, existing brine extraction cavern, salt-cavern gas storage, numerical simulation, Huaian Area

CLC Number:

TE349

Shi Yue, Guo Wenpeng, Xu Ning, Hou Xiaolu, Zhao Yuan, Du Caixia. Key Technology and Application of Reconstruction of Existing Brine Extraction Caverns into Salt Cavern Gas Storage[J]. Special Oil & Gas Reservoirs, 2021, 28(5): 134-139.

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