PowerScrew™ Operating and Setting Sequence
Seminole has designed the PowerScrew™ Liner System for easy deployment with a simple setting process. Using torsional energy from the top drive in the setting process, the PowerScrew does not require high pressure for setting that is needed by many conventional hanger systems.
- A spade-nose casing shoe is typically utilized in setting the PowerScrew.
- Our unique Latch-Lock™ landing collar can be made up above the casing float collar or float shoe.
- The liner is run and made up to the bottom of the PowerScrew.
- The top of the PowerScrew is made up with a NC-50 connection, and is run into the hole on drill pipe to the setting depth.
- The liner is locked to the drill pipe through the PowerScrew and can be put in tension,compression, and torqued at will being respectful of the equipment’s mechanical limits.
- Tag bottom and pick up the string to setting depth.
- With a rotating cement manifold in place, pump the cement into the drill pipe. Over-displacement of cement is not recommended.
- Switch the cement manifold to drilling fluids and pump the Latch-Lock dart between the two fluids. The dart will launch the cement plug at a predetermined pressure below the setting tool.
- Pump the Latch-Lock dart and plug assembly into the Latch-Lock landing collar.
- As pressure begins to spike, stop pumping the drilling fluid. Drop the steel setting ball and allow time to seat.
- Prepare for the metal forming process by putting the work string into compression and pressurizing the release mechanism. This action releases the liner from the PowerScrew setting tool.
- Apply torque to the string. With the liner released, torsional energy from the string is transferred to the liner top through the PowerScrew System’s unique multi-lead rifled mandrel.
- The helically stretched liner top embeds hardened slip wickers with profiled packer elements directly into the intermediate casing.
- With a sudden drop in torque, the liner top is fully integrated into the intermediate casing.
- The PowerScrew setting tool is ready to be removed from the hole, and the liner is ready to be pressure tested.
- To pressure test the liner, the setting tool’s burst-disks must be pressurized to allow circulation. The burst disks are set at a predetermined pressure. With circulation reestablished, the liner systems can be pressure tested at will.