Drilling Hole 1
1) Run a 12 /4" bit and BHA. Drill out the 17 /2" float collar, cement, casing shoe and wash down to the rat hole TD. If it is planned to drill a long section, install a wellhead bore hole protector into the first casing spool.
- Drill 5m (15ft) of new hole, condition the mud and perform a leak off test (Refer to section 11).
- Resume drilling with the 12 /4" bit using the proper BHA for a vertical or deviated hole.
- Drill the 12 /4" hole down to KOP and, if in a deviated hole phase, change the BHA for the build up. If the well is to be vertical, drill the 121/4" hole to the casing point.
- The drilling parameters and hydraulics will be in accordance with the Contractor Directional Operator's instructions (if present) otherwise follow the mud and bits drilling parameters as per the Drilling Programme.
- Take a directional survey using a MWD tool and/or single shot.
- At the 9 /8" casing point, circulate the shakers clean, make a wiper trip to the 13 /8" casing shoe and then 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 the bit to bottom to control the hole, circulate to condition the mud and pull out of the hole for running the 95/8" casing.
- Run and cement in the single or dual stage 95/8" casing (Refer to the Casing Running and Cementing section 12.1.5). Wait on cement.
- Hang the 9 /8" casing on the first intermediate casing spool giving it the additional tensile load calculated as per the 'Casing Design Manual' (STAP P1M6110-8.3.4), if required, and cut the 95/8" casing.
- Pick up the BOP stack.
- Nipple up the intermediate casing spool and test it.
- Lay down the BOP stack.
- Install the drilling spool and BOP stack and test as per the 'Well Control Policy STAP P1M6150-7) or install a well head protection cap and skid the rig as per skidding sequence, if on cluster wells.
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