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+--- Thread: Where will we see indications of gas at T-2? (/showthread.php?tid=263)
- petrengr1 - 01-18-2012
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/2011-11-15_3Q11_Results_Presentation_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/2011-11-15_3Q11_Results_Presentation_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?
- my2cows - 01-18-2012
I was thinking about that too. Well, more when then where. I went back to your previous postings on T-2, then went to Ant-2 drilling.
http://interoil.com/upload/pdfs/2009-08-24_Antelope-2_Drilling_report_No1_final_.pdf
On July 27,2009 spudding occurred... on Aug 24th they had successfully set 13 3/8 casing all the way down to 3,609 feet.
So, if your thinking indications of gas @ 3117 feet, we should get those indications within 30-45 days assuming a drill rate near ANT-2.
- petrengr1 - 01-18-2012
My2-Yes that sounds about right to me.
- oilmd9 - 01-18-2012
So---do you think they could be reporting a gas kick within a couple weeks? This could get exciting.
- oilmd9 - 01-18-2012
Sorry, didn't see last 2 posts
- petrengr1 - 01-18-2012
The timing is always a little tricky to predict. It depends on how long it takes them to set and cement a couple of strings of shallow casing. The drilling should not take very long. I would guess we are more than two weeks away from drilling into the sandstone at "their" predicted depth of 950 meters (+/- 150 meters)or 3117 feet (+/- 493 feet).
- Palm - 01-18-2012
Pet, thanks for setting the stage for what hopefully a very successful drill at T2. Will be fun to once again get your comments as drilling proceeds; been too long.
- jake990037 - 01-18-2012
Thanks Pet and my2. When IOC was last drilling their general policy seemed to be to make more announcements than presently. So I'm wondering whether the gas kick, case setting, and circulation loss kind of details we were getting then will still be forthcoming, or whether we will have to wait longer for news. Presumably some news counts as material and has to be released when, or very soon after, it happens. Anyone know what news to expect to be released and what news will have to be?
- jft310 - 01-18-2012
Its been estimated top of the formation in 30 days.Thats a big deal.IOC has confidentiality agreements on the deals they can't talk.Watch for NEC news thats a biggie. Needs to be a PNG govt announcement. Petromin would get advance notice from NEC. That and some SAC hedge Fund managers were arrested today might explain the POP this AM
- petrengr1 - 01-19-2012
Referring back to my original post, one reason for drilling below the gas water contact to evaluate the quality of the reservoir rock might be because the part of the reservoir rock that is below the gas/water contact at the Triceratops-2 location will be above the gas/water contact in the areas of the field that are up dip from or higher than Triceratops-2. Once again if we look at http://www.interoil.com/presentation/2011-11-15_3Q11_Results_Presentation_Final.pdf charts 14 and 15 you can see that there are parts of the field that will be higher than Triceratops-2. The map on the right side of chart 14 is the one that uses the latest seismic data. On this map they have some of the up dip areas mapped up to 300 meters (984 feet) higher than Triceratops-2 and it looks like the reef is getting higher as it goes off the map to the West.