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+--- Thread: Antelope-4 ST-1 Drilling Report (/showthread.php?tid=9311)
Antelope-4 ST-1 Drilling Report - petrengr1 - 11-05-2015
RE: Antelope-4 ST-1 Drilling Report - Palm - 11-05-2015
Thanks Pet! Sounds like some good progress finally and good of OSH to once again give us the update first.
RE: Antelope-4 ST-1 Drilling Report - Stavros - 11-05-2015
Current Drilling Report as of October 31 - - - Depth = 1,950 meters
Previous Drilling Report as of September 30 - - - Depth = 1,940 meters
http://www.oilsearch.com/Media/docs/151008%20Drilling%20Report%20for%20September-3fbcb0f4-9894-4e6c-b2e1-393c19fd7eca-0.pdf
So what was the progress??
It seems were able to achieve "barrier integrity in the well at the top of the reservoir" and seemingly drill down an additional 10 meters.
People I know in the industry told me this would have taken a few days in Texas.
Doing it in PNG jungles/mountains is either (in general) more time-consuming, or the folks don't know how to do the job properly.
I hope that all safety issues are now addressed. If that's the case, and they can drill at a rate of about 30 meters per day, they can reach the "planned total depth" in 10-15 days from now.
NOOS, Palm will be a rich son of a gun.
RE: Antelope-4 ST-1 Drilling Report - Palm - 11-05-2015
The good progress (not great; didn't want to turn into a pumper since I want IOC to fail) is that they have been able to get things secure and move ahead with drilling. From here all that matters with Ant4 is that it gets completed including all testing.
Ant 6 spudding, and drilling to completion including any required testing is the one that MUST go near flawlessly so that Certification can be called for. My wish of course is that the rig craps out, the well implodes, catches fire and completely torches all gas, condensates and oil completely wiping everyone out.
RE: Antelope-4 ST-1 Drilling Report - Stavros - 11-05-2015
Red Adair is no longer with us to stop your blowout Palm.
He died at the age of 89 in 2004.
Elk Antelope is the first commercial petroleum production from carbonate reservoirs, much of the earliest exploration activity in the basin was in the Eastern Papuan Fold Belt (PFB) and involved carbonate objectives. The first discovery in the basin was at Kuru in 1956.
This Kuru #1 well was drilled by the "Australasian Petroleum Company" and blew-out at a rate estimated to be in excess of 50 MMCFD when unexpected gas production was encountered at shallow depths in a Tertiary Carbonate reservoir. After four months of uncontrolled blowout, Red Adair was brought in and, with the drilling of a relief well, was able to control and kill the blowout.
RE: Antelope-4 ST-1 Drilling Report - johnwgrant - 11-05-2015
(11-05-2015, 02:25 PM)Stavros Wrote: Current Drilling Report as of October 31 - - - Depth = 1,950 meters Previous Drilling Report as of September 30 - - - Depth = 1,940 meters http://www.oilsearch.com/Media/docs/151008%20Drilling%20Report%20for%20September-3fbcb0f4-9894-4e6c-b2e1-393c19fd7eca-0.pdf So what was the progress?? It seems were able to achieve "barrier integrity in the well at the top of the reservoir" and seemingly drill down an additional 10 meters. People I know in the industry told me this would have taken a few days in Texas. Doing it in PNG jungles/mountains is either (in general) more time-consuming, or the folks don't know how to do the job properly. I hope that all safety issues are now addressed. If that's the case, and they can drill at a rate of about 30 meters per day, they can reach the "planned total depth" in 10-15 days from now. NOOS, Palm will be a rich son of a gun.
Not to be a Nattering Nabob of Negativity, but, if you read the news release carefully:
1) They do NOT say that they have achieved "barrier integrity" at 10/31/15 - only that they were focused on that. They are running the 5" liner - maybe that tells us they were successful ?!?! I don't know 
2) They do NOT say that they are currently drilling ahead. They were running the 5" liner. Drilling is their "forward plan". Yes the number is 10 meters more than InterOil's depth - but, this could be 'rounding' or using a different reference point. You will note that their comment about hitting the top of the reservoir higher is a slightly different number than InterOil's.
BTW, you would think that with the porous reservoir that they will be drilling through, they could make a lot more than 30 meters per day !!!! We'll see....
RE: Antelope-4 ST-1 Drilling Report - Stavros - 11-05-2015
Thanks Mr Agnew wherever you are!
RE: Antelope-4 ST-1 Drilling Report - sageo - 11-06-2015
'johnwgrant' pid='64303' datel Wrote:
'Stavros' pid='64296' datel Wrote:Current Drilling Report as of October 31 - - - Depth = 1,950 meters Previous Drilling Report as of September 30 - - - Depth = 1,940 meters http://www.oilsearch.com/Media/docs/151008%20Drilling%20Report%20for%20September-3fbcb0f4-9894-4e6c-b2e1-393c19fd7eca-0.pdf So what was the progress?? It seems were able to achieve "barrier integrity in the well at the top of the reservoir" and seemingly drill down an additional 10 meters. People I know in the industry told me this would have taken a few days in Texas. Doing it in PNG jungles/mountains is either (in general) more time-consuming, or the folks don't know how to do the job properly. I hope that all safety issues are now addressed. If that's the case, and they can drill at a rate of about 30 meters per day, they can reach the "planned total depth" in 10-15 days from now. NOOS, Palm will be a rich son of a gun.Not to be a Nattering Nabob of Negativity, but, if you read the news release carefully:
1) They do NOT say that they have achieved "barrier integrity" at 10/31/15 - only that they were focused on that. They are running the 5" liner - maybe that tells us they were successful ?!?! I don't know
2) They do NOT say that they are currently drilling ahead. They were running the 5" liner. Drilling is their "forward plan". Yes the number is 10 meters more than InterOil's depth - but, this could be 'rounding' or using a different reference point. You will note that their comment about hitting the top of the reservoir higher is a slightly different number than InterOil's.
BTW, you would think that with the porous reservoir that they will be drilling through, they could make a lot more than 30 meters per day !!!! We'll see....
Johnwgrant- Good am to you. Imho,I boil your post concerning Ant 4 down to 3 words,"troubling and bewildering". Two months for Ant 5 and more and more months(???) for Ant 4. As Gator said,"I believe in the asset" , but for me too the progress seems(in my words "mystifying" (sp ?) . Clarification soon would be a welcomed relief
RE: Antelope-4 ST-1 Drilling Report - jft310 - 11-06-2015
Nov 13th tbe analysts should be able to get a view into the time line .
RE: Antelope-4 ST-1 Drilling Report - petrengr1 - 11-06-2015
With all of this delay they have obviously experienced some problems that have not been revealed to the public by either IOC or OSH (or Total).
Sept. 18 , 2015 IOC PR: “The Antelope-4 side track appraisal well in Petroleum Retention License 15 has intersected the reservoir 36 meters (118 feet) higher than the original Antelope-4 penetration.”
Sept. 30, 2015 OSH Drilling Report: “At 30 September 2015, Antelope 4 ST1 was at a depth of 1,940 metres and running liner in an 8- 1 /2” hole, after tagging the top of the target carbonate reservoir”.
Oct. 19, 2015 IOC PR: “The top of the reservoir had been encountered in the Antelope-4 ST-1 well at 1,875 meters (6,152 feet true vertical depth sub-sea), which was 36 meters (118 feet) higher than the original Antelope- 4 penetration. Casing has been set above the reservoir and cement bond logs recorded. Prior to drilling ahead additional cementing operations are being conducted to ensure integrity of the casing shoe...”
Oct. 31, 2015 OSH Drilling Report: “At 31 October 2015, Antelope 4 ST1 was at a depth of 1,950 metres and running 5” liner in an 8- 1 /2” hole, after tagging the top of the target carbonate reservoir approximately 30 metres high to expectations”
On Sept, 30, 2015 they were running a liner at a depth of 1,940 meters in an 8 ½” hole. They did not say what size liner they were running but I assume it was a 7” liner. On Oct. 19th, 2015 they had casing set “above the reservoir” but they do not say how far above the reservoir. This at least implies that the liner was set at the top of the reservoir or at about 1,940 meters drill depth (or 1,875 meters sub sea).
On Oct. 31st they are again running a liner (this time they tell us the size is 5”) in an 8 ½” hole at a drill depth of 1,950 meters or almost the same as the previously reported 1,940 meters. I believe the 1,940 meters is an error and the 8 ½” hole has always been at a depth of 1,950 meters drill depth. (It is highly unlikely that they drilled an additional 10 meters of 8 ½” hole below the 7” liner)
It is very uncommon to set two liners at the same depth. Two reasons come to mind:
1. The 7” casing got stuck before it reached bottom and could not be pulled back out. I discount this possibility because they have told us the first liner was set “above the reservoir and cement bond logs recorded.”
2. They have perforated the 7” liner in many places to squeeze cement behind the casing to improve the cement bonding. After squeezing cement through the perforations the casing will normally hold pressure and can be trusted so that we could drill ahead safely. I think the casing has either failed the pressure test or Total does not want to trust the 7” liner to hold pressure because of the perforations or possibly a hole in the liner. So before drilling ahead they have decided to run the 5” liner inside the 7” liner at more or less the same depth to give them an additional layer of steel for safety before drilling ahead.
Unfortunately with the 5” liner in place we will only be able to drill ahead with a bit size of about 4”. We should be able to drill through the reservoir, log and test. The hole is pretty small for side wall cores but they could take some full hole cores it they decide that is required although coring equipment for a hole this small is probably not available locally. They probably will not case the reservoir section because they would have to use something like 2 7/8” tubing as casing for this 4” hole.
OSH is now stating that the planned TD is 2,375 metres. They had previously sated the planned TD was 2,468 metres. So using their latest number we have an additional (2,375 -1,950) 425 meters or 1,394 feet to drill. Part of the delay was probably having to bring in the 5” liner and now they will need enough smaller drill pipe and drill collars to drill this additional 1,394 feet of hole.
We have now been at this depth for at least 7 weeks and it has been nearly 10 weeks since they started operations at Antelope-4 ST-1.