The Tongluoxia Gas Storage is a fractured depleted gas storage reservoir controlled by faults.Spoon-shaped high-angle wells are utilized to increase the encounter rate of fractures and enhance the reservoir contact area.The wellbore trajectory is complex,with significant collapse evident in some formations.Meanwhile,the production casing needs to meet the demands of long-term high-intensity injection and production.The cementing construction faces technical challenges such as difficulties in safely running casing,ensuring casing centralization and displacement efficiency,and high requirements for wellbore integrity and cementing quality.To address these issues,the rigidity of the drilling string strengthened by using stabilizer and large-sized drill collars,reducing the difficulty of running the production casing.The placement of stabilizers is optimized,and efficient flushing and isolation fluids are used to improve displacement efficiency and cement bonding quality.A resilient cement slurry system is used in conjunction with prestressed cementing technology to enhance the long-term sealing of the cement sheath.This series of supporting technologies has been applied on-site in 4 wells,with a production casing cementing quality excellence rate of 97.67%,which can provide a technical reference for similar gas storage wells.
production casingwellbore stabilizerductile cement slurryprestressed cementingcementing qualityTongluoxia gas storage
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