Latest revision as of 13:42, 23 January 2026

Abstract

Salt cavern gas storage imposes stringent requirements on casing performance due to salt rock creep and high in-situ stress, necessitating a balance between mechanical strength and economic viability. This study evaluates the collapse resistance of BG110V and BG140V casings under 50°C–85°C through full-scale experiments (ASTM E2948) and elastoplastic finite element simulations. Results show that BG140V achieves a collapse strength of 75.94 MPa at 85°C, surpassing BG110V (52.96 MPa) at the same temperature by 43.4%, attributed to its thick-walled design (17.50 mm vs. BG110V’s 15.88 mm) and material enhancements. Simulations reveal lower prediction errors for BG140V (5.9% in full collapse) compared to BG110V (20.6%). A multi-criteria model integrating collapse strength (0.5), temperature sensitivity (0.3), and life-cycle cost (LCC, 0.2) with Monte Carlo analysis demonstrates BG140V’s LCC advantage in deep reservoirs (creep rate > 1.2× 10−7s−1, 12% maintenance cost reduction), while BG110V suits shallow scenarios (18% lower procurement cost). Dynamic selection strategies with real-time monitoring, low-friction thread optimization, crystal plasticity simulations, and smart maintenance systems are proposed. This study provides a quantitative framework for balancing safety and economy, advancing the standardization of non-API casings.OPEN ACCESS Received: 30/06/2025 Accepted: 19/08/2025 Published: 23/01/2026

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