Drilling Hole
1) Run a 17 /2 " bit and BHA. Drill out the 20" float collar, cement, casing shoe and wash down to the rat hole TD. If it is planned to drill a long section, install a well head bore hole protector into the base flange.
- Drill 5m (15ft) of new hole, condition the mud and perform a leak off test (Refer to section 11).
- Resume drilling with the 17 /2" bit using the proper BHA for either a vertical or deviated hole (Refer to section 8.1).
- Drill the 17 /2" hole down to KOP (if in a deviated hole phase) and change the BHA for the build up. If a well is to be vertical, drill the 171/2" hole to the casing point.
- Drilling parameters and hydraulics will be in accordance with the Contractor Directional Operator's instructions (if present) or as per the Drilling Programme. Mud and bits will be as per the Drilling Programme.
- Take a directional surveys using a MWD tool and/or single shot.
- At the 13 /8" casing point, circulate the shakers clean. Make a wiper trip to the 20" casing shoe. Run to bottom reaming any tight spots, circulate to condition the mud and pull out of the hole.
- Run electrical logs as per the Geological Programme.
- Run a bit to bottom to check the hole, circulate to condition the mud and pull out of the hole to run the 133/8" casing.
- Run and cement the single or dual stage 13 /8" casing (Refer to the Casing Running and Cementing section 12). Wait on cement.
- Hang the 13 /8" casing on the bottom flange giving it additional tensile load calculated as per the 'Casing Design Manual' (STAP P1M6110-8.3.4), if required, and cut the 133/8" casing.
- Pick up the BOP stack.
- Nipple up the first intermediate casing spool and test it.
- Lay down the BOP stack.
- Install the drilling spool, 133/8" BOP stack and test as per the 'Well Control Policy STAP P1M6150-7). or install a wellhead protection cap and skid the rig as per the skidding sequence, if drilling cluster wells.
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