Casing Drilling with Retrievable Drilling Assemblies（套管钻井）.ppt

Casing Drilling with Retrievable
Drilling Assemblies
OTC 2004 May 3-6, 2004
T. M. Warren, R. M. Tessari, B. Houtchens - Tesco Corp.
Overview of Talk
Casing Drilling system
Example Applications

Lobo (85 wells)
Stratton (15 wells)
Where to next?
Directional Drilling
Casing Running
Casing Drillingtm is a trade name of Tesco Corp.
What is CASING DRILLINGtm?
“Process to simultaneously drill and case wells by using the casing as the drill string.”
Casing is rotated to drill.
Casing is near bottom at all times.
Casing cemented in the well without tripping it out.
Two Types
Retrievable & re-runable BHA
“Bit” attached to casing
Casing Drilling Justification
Lost circulation
Stuck Pipe
Kick
Sloughing Shale
Other
24% of time from spud to TD (Jan 2004 Offshore magazine)
Faster process
Reduces trouble time
Increased reserves
More wells
Better production rate
Integrated rig solution
Handling the Casing
Interface to top drive
Protect threads
Fast connections
Safe pipe handling
Casing Drive System
Connections for Adequate Torque
Buttress with MLT ring
Premium Casing Drilling connections
Must balance fatigue, torque rating & cost
MLT Ring
Casing coupling
Wear Band
Casing Protection
Crimping area
TC hardfacing
Installation Tool
Retrievable Drilling Assembly
Top of assembly locked in profile nipple.

Drilling assembly extends below casing shoe.
Capable of multiple runs .

Normally retrieved with 9/16” braided cable.
Must be reliable.
Profile
Nipple
Stabilizer
Casing
Shoe
Underreamer
Bit
DLA
Tesco Casing Drilling Experience
Drilled 31,000 ft in test wells
Drilled 130+ commercial wells
4-1/2”– 13/3/8” casing
700,000 ft with retrievable BHA
300,000 ft with non-retrievable BHA
300+ string of casing drilled
9 strings drilled directionally
Commercial foothold established
After 85 Wells at Lobo
Significant learning curve
Learned drilling techniques
Developed casing accessories
Improved equipment reliability
Bui