Implementation of new equipment for expandable casings strings

Authors: Sh.F. Takhautdinov, N.G. Ibragimov (Tatneft OAO), R.R. Ibatullin, G.S. Abdrakhmanov, N.Kh. Khamitjanov (TatNIPIneft), M.M. Zalyatov (Management Company Systema-Servis OOO)

Expandable casings strings applied by Tatneft on a commercial scale allowed complete exclusion of intermediate casing strings from the well designs in the Volga-Ural oil-producing region. Underway is research and pilot tests of expandable systems to isolate trouble zones as thick as 500-1000 m. For expanding of casing strings mechanical and hyd - raulic expansion mandrels are used, along with hydraulic jack, anchor, and by-pass valves.