Running casing is one of the most critical operations in drilling — ensuring well integrity, zonal isolation, and long-term production safety.
Here’s a clear breakdown of how it’s done using a CRT (Casing Running Tool):
- Pre-Job Preparation
• Verify casing tally and specifications (grade, weight, connections)
• Inspect CRT, slips, elevators, and safety equipment
• Function test the CRT (hydraulic/mechanical system)
• Ensure proper thread compound is ready - Pick Up Casing Joint
• Lift casing joint using elevators
• Stab into the rotary table carefully
• Clean and inspect threads before makeup - Make-Up with CRT
• Engage CRT with casing connection
• Apply torque using top drive
• Monitor torque-turn graph for proper makeup
• Ensure connection meets manufacturer specs - Lower Casing into Well
• Slowly run casing into the hole
• Fill casing with drilling fluid to maintain hydrostatic balance
• Monitor hook load and drag trends continuously - Circulation & Conditioning
• Circulate drilling fluid through casing
• Condition mud properties (viscosity, density)
• Ensure hole is clean and free of cuttings - Handling Tight Spots
• If resistance occurs:
• Work the string up/down
• Rotate casing (if allowed)
• Circulate to clean restrictions - Landing the Casing
• Land casing at planned depth
• Set casing hanger (if applicable)
• Confirm depth and position - Release CRT
• Activate CRT release mechanism
• Disengage tool safely
• Pull out of hole - Final Checks
• Pressure test casing string
• Prepare for cementing operation
Key Safety Notes
• Always monitor torque & drag trends
• Avoid over-torqueing connections
• Maintain proper communication between rig floor & driller
• Follow strict HSE procedures