Abstract: Gas storage well is the core equipment of gas filling station for compressed natural gas vehicles and is used for storage of high-pressure natural gas. The working pressure of gas storage well is up to 25 MPa. This paper took the natural gas high-pressure underground gas storage wells of certain company as an example. From the aspects of risk identification and control, material selection of main pressure-bearing components, structure design of wellhead, well bore and well bottom, stress analysis and fatigue assessment, drilling and well casing assembly during construction, cementing process control, cementing quality inspection, pressure resistance and leakage test, this paper elaborated the design process. It also analyzed and researched the control points and difficulties of each link. Then the paper put forward targeted solutions and countermeasures and clarified various technical requirements. This provides technical reference for the design and manufacture of such equipment.

Key words: high-pressure storage of natural gas, wellhead device, casing, coupling, bottom hole device, well cementation