The PORT Pressure Operated Reference Tool provides a reference pressure to the PCT Pressure Controlled Tester valve and also serves as a bypass when running in the hole. The PORT tool is used to trap a reference pressure within the PCT valve, eliminating the need for a high-nitrogen precharge at the surface. This trapped reference pressure provides a high-closing force for the PCT ball valve.
To operate the tool, pressure is applied to the annulus, causing the disc to rupture. When coming out of the hole, for safety, the downhole reference pressure is bled through the relief valve.
Because the PORT tool is pressure-operated, no set-down weight is required, as it is with the hydrostatic reference tool (HRT). Therefore, the string can be run in tension,greatly simplifying the string design when testing with a permanent packer. In this case, drill collars (weight) and slip joints (length compensation) can be eliminated. Length compensation is provided by the packer stinger when using a permanent packer.
Options
The PORT tool is normally fitted with a formation protector module (FPM) kit when open perforations are present. The FPM kit prevents the annulus overpressure needed to close the PORT tool from communicating with the open formation through the bypass ports.
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