01-18-2012, 07:33 AM
There will probably be a little gas in the mud as they drill the shale and sand above the carbonate reef.
Based on http://www.interoil.com/presentation/201..._Final.pdf chart 15 I will guess 950 meters (3117 feet) for the first gas kick. They may have to raise the mud weight at that point. That would be the sandstone seismic marker mentioned. After they recover some sand in the cuttings they will have a better idea what the depth of the top of the carbonate will be. The next and more severe gas kick will come after they drill into the reef and loose circulation. If we are lucky they will set casing right above the top of the carbonate, before we get this kick, and then drill into the reservoir. So, I hope this kick will come with casing already set and cemented at the top of the reef.
They are hedging their bets a little in the PR today where they said they expect the top of the carbonate reservoir to be 1500 feet above the water contact. In April of 2011 they presented http://www.interoil.com/presentation/201..._Final.pdf chart 22 which indicated they expected the top of the carbonate to be 1500 feet higher than Bwata-1 which would make it 2012 feet above the gas water contact.
Chart 15 of the Nov. 15th presentation indicates they expect the top of the carbonate to be at 1320 meters (+/- 200 meters). So let’s guess it comes in at 1320 meters or 4331 feet. If we add 1500 feet of gas column to that (could be 2012 feet) then we would get the gas water contact at (4331 + 1500) 5831 feet.
“The plan is to drill the entire reservoir interval with a predicted total depth of the well of approximately 7,579 feet (2,310 meters).” Why are they drilling (7,579 - 5831) 1748 feet below the expected gas water contact? Well, maybe another 512 feet of it is full of gas. The other 1236 feet I leave to your speculation. Maybe they just want to see the quality of the reservoir rock below the water contact. I do not know why they need that since all of the reservoir below the gas water contact should be expected to be filled with water through out the field i.e. the carbonate reservoir/field.
I would like to see if there is any reservoir rock in the little anticline that appears on chart 15 well below the base of the carbonate (right below Triceratops-2). They apparently do not plan to drill that deep. Could there be a Pale/Subu sandstone lurking down there?
Based on http://www.interoil.com/presentation/201..._Final.pdf chart 15 I will guess 950 meters (3117 feet) for the first gas kick. They may have to raise the mud weight at that point. That would be the sandstone seismic marker mentioned. After they recover some sand in the cuttings they will have a better idea what the depth of the top of the carbonate will be. The next and more severe gas kick will come after they drill into the reef and loose circulation. If we are lucky they will set casing right above the top of the carbonate, before we get this kick, and then drill into the reservoir. So, I hope this kick will come with casing already set and cemented at the top of the reef.
They are hedging their bets a little in the PR today where they said they expect the top of the carbonate reservoir to be 1500 feet above the water contact. In April of 2011 they presented http://www.interoil.com/presentation/201..._Final.pdf chart 22 which indicated they expected the top of the carbonate to be 1500 feet higher than Bwata-1 which would make it 2012 feet above the gas water contact.
Chart 15 of the Nov. 15th presentation indicates they expect the top of the carbonate to be at 1320 meters (+/- 200 meters). So let’s guess it comes in at 1320 meters or 4331 feet. If we add 1500 feet of gas column to that (could be 2012 feet) then we would get the gas water contact at (4331 + 1500) 5831 feet.
“The plan is to drill the entire reservoir interval with a predicted total depth of the well of approximately 7,579 feet (2,310 meters).” Why are they drilling (7,579 - 5831) 1748 feet below the expected gas water contact? Well, maybe another 512 feet of it is full of gas. The other 1236 feet I leave to your speculation. Maybe they just want to see the quality of the reservoir rock below the water contact. I do not know why they need that since all of the reservoir below the gas water contact should be expected to be filled with water through out the field i.e. the carbonate reservoir/field.
I would like to see if there is any reservoir rock in the little anticline that appears on chart 15 well below the base of the carbonate (right below Triceratops-2). They apparently do not plan to drill that deep. Could there be a Pale/Subu sandstone lurking down there?