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Case Study

Non-Rotating Protectors Allow Drilling Ahead with High Riser Deflection

Riser Deflection Limits Drilling Window  
A    semi‐submersible    rig    drilling    in    8,125ft  (2,477m)    of    water    experienced    110    hours with    the    lower    flex    joint    (LFJ)    differential angle    greater    than    0.5°    and    had    to    stop    drilling    ahead.        Ocean    currents    caused    riser deflection    and    elevated    concern    for    stress    in   the    riser    and    LFJ    wear.  NRPs Reduce Concern of Wear Installing    SS‐658‐SC    model    non‐rotating  protectors    (NRPs)    through    the    deflected  lower    flex    joint    or    ball    joint    reduced    concern    for    wear.        The    NRP    sleeve    maintains standoff    of    the    drill    pipe    tool    joint.    In    110    hours    with    the    differential    angle    greater than    0.5°,    drilling    ahead    for    43    hours    was   possible    using    NRPs.        The    table    below    was  provided    by    the    operator.

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