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.
- Use of a Rotating Cement Head is preferred but not required.
- The float shoe must be made up below our Latch-Lock Landing Collar.
- Make up the last liner connection to the bottom of the Powerscrew.
- Make up the top (Drill Pipe) Powerscrew connection and run in the hole on drill pipe to 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 with the casing shoe, pick-up to setting depth.
- With the Cement Manifold in place, pump cement from the rig floor.
- After cement, switch over to displacement fluid and pump the drill pipe dart between the two fluids.
- The dart will launch the Latch-Lock cement plug positioned below the setting tool. (The liner can be released just prior to plug launch with no ball drop)
- Continue pumping displacement fluid and bump the plug into the landing collar.
- If utilized, pump or drop the steel setting ball and allow time to seat.
- Prepare for the metal forming process by putting the work string into compression. If a ball was pumped or dropped, the release mechanism must be pressurized to initiate liner release. (Ball drop complies with BSEE Regs)
- Apply torque to the work string.
- With the liner released, torsional energy from the work string is transmitted to the liner top through our 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. Pick-up to ensure loss of liner weight
- With a ball drop, the setting tools burst disks must be pressurized to allow circulation.
- With circulation reestablished, pressure test the liner system.
- The Powerscrew setting tool can now be pulled out of the hole.