• Pump-in Sub

    The Pump-In Sub (PIS) is normally positioned below the wireline valve and above the wellhead. Its main function is to allow well control by pumping fluid below a closed wireline valve.

    WPCE Pump-in Sub pdf


    The PIS has quick unions top and bottom, and a WECO (Hammer Union) type side connection.

    Pump-in subs are normally supplied with a blind plug & nut on the WECO port. A suitable valve is needed to operate the PIS, replacing the blind plug. Pump-in subs can also be used for fluid sampling or inhibitor injection. Specially designed pump-in subs, with different top and bottom unions are used as wellhead adapter x-overs.