Drill 17 1/2″ Hole Section -Drill the hole to the planned depth for 13 3/8” casing. -Monitor drilling parameters and formation behavior.
Reach Planned Total Depth (TD) for 13 3/8″ Casing -Stop drilling once the target depth for this section is reached. -This is referred to as the “Final Cut” for the 13 3/8” casing.
Circulate Bottoms Up -Circulate drilling mud to clean the hole from cuttings and gas. -Ensure hole is clean and stable.
Perform Wiper Trip (Optional but Recommended) -Pull out drill string partially and run back in to ensure hole is clear and gauge. -Detect tight spots or swelling formations.
Condition the Mud -Adjust mud properties (weight, viscosity, etc.) for good hole stability and displacement efficiency. -Remove cuttings and enhance cementing success.
Run 13 3/8″ Casing String -Assemble and run casing joints into the hole. -Includes centralizers, float shoe, float collar, and other casing accessories. -Monitor for drag or obstructions.
Land the Casing -Set casing at planned depth with correct slack-off weight. -Ensure casing is properly seated on float shoe/collar.
Perform Circulation Check -Attempt to circulate mud through casing to confirm no blockage. -Ensure hole is in good condition for cementing.
Cement the 13 3/8″ Casing -Pump spacer, followed by cement slurry, then displacement fluid. -Ensure returns at surface or through planned returns zone. -Use float equipment to prevent backflow.
Wait on Cement (WOC) -Allow cement to set and harden (typically 8–12 hours or as per program). -Monitor for any losses or surface indications.
Pressure Test the Casing (Optional/Programmed) -Conduct casing integrity test to confirm cement job and casing strength.
Install Wellhead or BOP -Once casing is set and cemented, install wellhead or BOP stack. -Prepares for drilling the next hole section (e.g. 12 1/4″ or 8 1/2″).
