Collet Running Tool (CRT)

The collet running tool (CRT) is a hydraulically released running tool that requires no rotation to be released from the liner, making it suitable for applications in high-inclination wells. The clutch and premium tool joint connections permit high-torque rotating and drilldown capabilities throughout the liner system. When a rotational liner hanger is deployed, the CRT also enables the liner to be rotated after the liner hanger is set.

The CRT has a backup mechanical-release mechanism to ensure its release from the liner. The mechanical release is achieved by a one- quarter left-hand turn and placement of the tool in compression.

The CRT is used to run liner hanger systems that use the LTP Max* high-pressure liner top packer or the setting adapter, such as the COLOSSUS CMT* cemented liner hanger system and COLOSSUS UNC* uncemented liner hanger system. The setting string assembly comprises a CRT running tool, a slick joint, a cementing packoff bushing, a liner wiper plug adapter, and an extension to connect to the running string. A packer dog assembly can also be included if an LTP or LTP Max packer is run.

APPLICATIONS

  • High-inclination wells
  • Liners requiring drilldown capabilities
  • Liner rotation after liner hanger is set
  • Tight wellbores
  • Long and heavy liner deployment
  • Running a liner hanger with or without a liner top packer

BENEFITS

  • Reduces risk of premature liner release and enhances well stability and safety by adding backlash protection
  • Reduces risk of pulling liner out of the well and saves associated time and costs by adding secondary release
  • Minimizes completion time by enabling liner rotation while running into the well
  • Improves cement integrity and enhances well stability and safety by enabling liner rotation while cementing

FEATURES

  • Capability of carrying heavy liner loads
  • Clutch design that transmits high torque to liner
  • Variable shear-pressure settings for liner systems comprising numerous hydraulic actuating components
  • Backup mechanical release (one-quarter left-hand turn) to ensure liner release
  • Optional standing valve profile in bottom sub for contingency release