TDDirect CD Casing-Drilling Service | Schlumberger

TDDirect CD

Casing-drilling service

Casing drilling for logging while drilling or directional applications

The TDDirect CD casing-drilling service is used with a retrievable BHA when an interval must be logged while drilling or drilled directionally. Conveyed on drillpipe, the service works with any BHA and can be used to drill boreholes that require multiple bit changes, or for applications that require rotary steerable systems (RSS) or MWD or LWD tools.

Service meets challenges of problematic formations

For directional applications, the retrievable TDDirect CD service uses a steerable BHA, which is compatible with RSS or positive displacement motor (PDM) directional tools. When drilling in depleted or mature fields characterized by lost circulation and wellbore instability, this service offers several key capabilities, including

  • consistent casing rotation breaks static friction, enabling an even weight-on-bit
  • rotation and high-annular velocity improves borehole cleaning, moving cuttings into the flowstream
  • the plastering effect maximizes borehole strength and stability.
TDDirect CD Casing-While-Drilling Service
The DLA seals and connects the BHA to the casing string with a triaxial lock. At any point during the drilling process, the DLA can be disengaged for BHA retrieval. If needed, the BHA can be tripped back in and reseated in the DLA to continue drilling.
Proven performance in casing drilling services
Since 1998, TDDirect technology has increased drilling efficiency in a wide range of on- and offshore applications worldwide: more than 1,450 wells, totaling 4 million ft, deeper than 15,500 ft.
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