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+--- Thread: Did we get a hint about the top of the Reservoir at Antelope-3? (/showthread.php?tid=2019)
Did we get a hint about the top of the Reservoir at Antelope-3? - petrengr1 - 11-16-2012
Looking at http://www.interoil.com/iocfiles/documents/investorrelations/presentationanddocuments/2012/2012-11-15%203Q%20Results%20CC%20Presentation.pdf page 16 we can see that the top of the reservoir is expected to be at 5,545 feet (1,690 meters).
If we look at the transcript http://seekingalpha.com/article/1010821-interoil-corporation-s-ceo-discusses-q3-2012-results-earnings-call-transcript?page=5 where Dave Holland is talking I think he may have given us a hint that we did not pick up. He said on pages 3 & 4 “ The formation being drilled consists of approximately 70-80% clay stone, 5-10% [unintelligible] stone, and 10-15% sandstone, with a trace to 5% coal penetrating from 1,532 meters to 1,535 meters. This occurrence of coal is higher than prognosis based on the Antelope-1 offset well. At 1,535 meters, the [calcimetry] measurements were at possibly 6.9% calcium carbonate, or limestone, and 1.75% magnesium carbonate with dolomite. However, at 1,540 meters [unintelligible], the calcimetry increased to approximately 20% limestone and 70% dolomite. As such, we are currently drilling ahead at a controlled rate toward the top of the reservoir and circulating bottoms up at approximately 2-meter intervals.”
They are drilling ahead very carefully in case this formation (which is 20% limestone and 70% dolomite) is the top of the reservoir. If this is the top of the reservoir they have hit it 150 meters (492 feet) higher than expected. If they get a large increase in gas or a gas kick they will probably set casing near this depth 1,540 -1,560 meter level. If the top of the reservoir is truly that high, the mud weight will have to be higher that anticipated in order to control the pressure. We will have to hope they do not experience a loss of circulation before getting the casing set. If they get into trouble they may have to set a cement plug at the top of the reservoir in order to safely run the casing.
If this turns out to be the top of the reservoir the gas column will be about 500 feet thicker than we had previously expected. With a derrick floor elevation of 99.7 meters above sea level and a gas water contact at -2,228 meters sub sea, the gas column would be 768 meters or 2,519 feet thick.
Otherwise the formation could turn back to claystone as we drill ahead and we might proceed to drill to the top of the reservoir as per the original prognosis.
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RE: Did we get a hint about the top of the Reservoir at Antelope-3? - ArtM72 - 11-16-2012
Pet -
Wouldn't the seismics have indicated the higher resevoir top? On the surface of it I'd trade accurate seismics for a 150 meter higher column. But then, my vote doesn't count.
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - petrengr1 - 11-16-2012
'ArtM72' pid='12686' datel Wrote:Pet - Wouldn't the seismics have indicated the higher resevoir top? On the surface of it I'd trade accurate seismics for a 150 meter higher column. But then, my vote doesn't count.
Art- I think the seismics are not all that accurate. As I recall Antelope-2 came in about 300 feet higher than expected also.
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - jft310 - 11-16-2012
Somehow IOC mgt knew this was the highest reservoir rock column and I told the board that many times!!!
At one time A-3 was saved for the new major but that didn't happen. I agree this data may not be on the IOC slides. But I do know what IOC Mgt stated and guess what they were right again.
Is this why Henry Aldorf raised his T estimate,??? Henry also thinks there is good chance for extra liquids at E-3.In those sandstones. Write that down also and we can see if Henry is right. Will they drill into the Sandstones this time at E-3?? Ask yourself why did they place this rig where they did?? Can it drill to 16,000 feet. Why did they buy a rig that can drill this deep and why is it at E-3 now. Can you see whats going on???
I have Great sources. BUT I am far from right all the time but neither is RJ or MS or Sal or IOC. in their reports and on their slides. Things change on PNG can ya tell????
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - bertl05 - 11-16-2012
Lets try to stick to facts here.
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - jft310 - 11-16-2012
Bert just because you don't know something to be true doesn't mean its not true.Things change. Wheres Merrill Lynch?? etc etc .FID last Dec???etc etc..
Which Morgan , RJ, Sal reports , IOC slides presentation has been on target more then say 50%. Just go back 12 months and look.Or I can show you reports 7 years ago. That interesting .How much of that worked???
Its a dynamic situation . IOC has the assets. They are worth a fortune to Japan and others. The road is not straight but the destination known.
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - petrengr1 - 11-17-2012
In answer to Sageo in another thread-
Sageo- I think the first limestone/dolomite they see in these wells is the reservoir rock. Since they are drilling in limestone and dolomite that makes me think this is the top of the reservoir. We need to set the casing as soon as we are sure we have reached the top of the reservoir. If we drill too far into the reservoir we will probably encounter a fractured zone or a zone of high permeability just like we did in Antelope-1 and Antelope-2. If we drill into one of these zones before we set casing the mud level in the hole will drop and we will not be able to keep the hole full which is required to control the reservoir pressure. If we are unable to keep the hole full the reservoir pressure will be exerted against the shallow surface casing shoe at 3332 feet. If this ever happens the surface casing shoe may not be able to withstand the pressure and the gas will begin to flow into the shallow formations (under ground blow out) or to the surface on the outside of the surface pipe. If that ever happens it will be very difficult or impossible to control the well without drilling a relief well. Even then it may be difficult.
To make a long story short, we need to set the casing as soon as we know we have reached the top of the reservoir.
But don't worry. As my friends are quick to say, others know more.
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - sageo - 11-17-2012
'petrengr1' pid='12793' datel Wrote:In answer to Sageo in another thread- Sageo- I think the first limestone/dolomite they see in these wells is the reservoir rock. Since they are drilling in limestone and dolomite that makes me think this is the top of the reservoir. We need to set the casing as soon as we are sure we have reached the top of the reservoir. If we drill too far into the reservoir we will probably encounter a fractured zone or a zone of high permeability just like we did in Antelope-1 and Antelope-2. If we drill into one of these zones before we set casing the mud level in the hole will drop and we will not be able to keep the hole full which is required to control the reservoir pressure. If we are unable to keep the hole full the reservoir pressure will be exerted against the shallow surface casing shoe at 3332 feet. If this ever happens the surface casing shoe may not be able to withstand the pressure and the gas will begin to flow into the shallow formations (under ground blow out) or to the surface on the outside of the surface pipe. If that ever happens it will be very difficult or impossible to control the well without drilling a relief well. Even then it may be difficult. To make a long story short, we need to set the casing as soon as we know we have reached the top of the reservoir. But don't worry. As my friends are quick to say, others know more.Pet 1 - Thanks for enlightenment ! When you mentioned "relief well " I felt a shudder in the old body....very old !! I will use my old prayer bones to ask that we won't need to go that route . Your knowledge and thoughts are always welcomed. As Hemi says.....H&H to you !
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - Getitrt2 - 11-17-2012
jft, both rigs are at E/A now because they have to drill both wells now to satisfy PRL requirements. As far as why Rig 3 is at E3 and not A3, I believe it is because it is not heliportable like Rig 2, and is much easier to get to E3 than A3, mostly by water/barge and a much shorter road. They may have bought it with ultimate use of that deeper capability in mind, but it is also faster; and depth is not necessarily, and I don't think likely, to be the reason it is at E3.
RE: Did we get a hint about the top of the Reservoir at Antelope-3? - jft310 - 11-18-2012
After the water well at Elk I was told by at least 3 persons that they wanted to drill deeper at Elk.Will they this time??The WA line states what Pet states but Spartina and others who own a drilling interest think they may drill deeper.We need to wait to see but dont be surprised if they drill deeper. Lots of reasonable arguements can be made for both ideas.