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ESTIMATED <br /> TIME ALLOCATION <br /> AIR-MIST DRILLING <br /> Estimated Drilling Time Allocated To The 9 5/8" "GOB" Hole <br /> 1. Rig up Rotary Tools, ready to spud. 1 1/2 Days <br /> 2. Drill 12 1/4" pilot hole to 300' with mud, <br /> ream 12 1/4" pilot hole to 17 1/2" for 13 <br /> 3/8" casing. Includes straight hole sur- <br /> veys. Run, set and cement 13 3/8" casing, <br /> WOC - 12 hours. 3 Days <br /> 3. Nipple up and make ready to drill below <br /> 13 3/8" casing with air-mist. 3/4 Day <br /> 4. Drill 12 1/4" hole with air-mist from 300' <br /> to 2400'+. Estimated average rate of pene- <br /> tration 25/30 ft per hour. Includes 2 trips <br /> for new bits and straight hole surveys. 4 1/2 Days <br /> 5. Condition hole and mud up to run 9 5/8" casing. <br /> Short trip to check hole fillup. 1/2 Day <br /> 6. Pull out of hole, lay down 12 1/4" drilling <br /> assembly. Rig up to run 9 5/8" casing. 1/2 Day <br /> 7. Run, set and cement 9 5/8" casing at 2400'+ <br /> and set slips - WOC - 12 hours. 1 1/4 Day <br /> 8. Pick up 8 3/4" drilling assembly and make <br /> ready to drill out below 9 5/8" casing with <br /> air-mist. Test 9 5/8" casing to 1000 psig <br /> for 30 minutes. 1/2 Day <br /> -4- <br /> I <br />