Design and Test of High Temperature Deep-Water Subsurface Safety Valve

The integrated injection and production technology in offshore oil fields requires that the downhole safety valve has a temperature resistance of 350℃ and a working depth of not less than 1 330 m. However, no existing downhole safety valve can meet the requirements. To address the problem, the high temperature deep-water subsurface safety valve is developed. The prototype is produced and to conduct laboratory tests. Finite element stress analysis is carried out on the key component-the compression spring. The results show that the high temperature deep-water subsurface safety valve has simple but reliable structure, with small number of leakage points. All metal seal is adopted. And it can work well from normal temperature to 350℃. Its maximum working depth is up to 1 330 m with the pressure capacity of the valve plate and the whole tool up to 35 MPa. The study could provide references for the field application of high temperature deep-water subsurface safety valve. On-site use of the high temperature deep-water subsurface safety valve is recommended to promote the application as soon as possible.