Antelope-4 ST-1 Drilling Report

[Putncalls]

Why can't Dave Holland have Kirk's job?

[sageo]

Pet - Thanks a million for your thoughts concerning our time-frame and some of the possibilities that could be going on currently.I guess our huge amount of very porous dolomite can also be a hindurance when it comes to getting a solid cement job.Don't particularly like the smaller pipe and tubing situation,but I guess"it is what it is". Please keep up your outstanding and helpful work .

[Palm]

I would guess that's one "Opus" Mr Holland doesn't want right now.

[ArtM72]

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.

meanwhile the force and duration of the resultant rocket flare sets a wobble to the earth's orbit with the moon expected to impact the earth ....

Flare not good.

[ArtM72]

Pet - Thanks a million for your thoughts concerning our time-frame and some of the possibilities that could be going on currently.I guess our huge amount of very porous dolomite can also be a hindurance when it comes to getting a solid cement job.Don't particularly like the smaller pipe and tubing situation,but I guess"it is what it is". Please keep up your outstanding and helpful work .

I share your imagined troubles with porous limestone being encountered substantially earlier than anticipated.  How much cement needed to fill that hole?  Could be a lot.

Pet might comment on whether the smaller casing size now precludes horizontal drilling and whether even while reduced in size A4 will remain as a prolific production weill.

[Getitrt2]

I would not even imagine trying to speak for Pet, but I'm pretty sure the ST is being drilled almost entirely for appraisal and testing of the formation southeast of Ant 4, not production, although probably usable for that also. Given the extremely high porosity, I suspect the original vertical Ant 4 could draw from that whole area for production, although I would say that more wells could produce more, of course.

[Getitrt2]

Why can't Dave Holland have Kirk's job?

Apparently you think the Company would be better off if it could go back to the drilling managers and crews it had when they were first drilling Elk/Antelope.  As I recall, when they were drilling Elk 1, their description of it was, "it was like trying to hold back the Mississippi", with much less of a gas column and porosity, and they were not able to even finish drilling the well at all.  Then they stepped out much too far on the edge of the formation with Elk 2 and got nothing.  Then they stepped out to the south to drill Elk 4, and lucked out by drilling through the fault into the bottom edge there of Antelope.  Also, everything they did took forever, and was on a financial shoestring.  Does my memory serve me correctly?

[petrengr1]

Pet - Thanks a million for your thoughts concerning our time-frame and some of the possibilities that could be going on currently.I guess our huge amount of very porous dolomite can also be a hindurance when it comes to getting a solid cement job.Don't particularly like the smaller pipe and tubing situation,but I guess"it is what it is". Please keep up your outstanding and helpful work .

I share your imagined troubles with porous limestone being encountered substantially earlier than anticipated.  How much cement needed to fill that hole?  Could be a lot.

Pet might comment on whether the smaller casing size now precludes horizontal drilling and whether even while reduced in size A4 will remain as a prolific production weill.

Art- Due to the lack of information provided I am afraid we have more questions than answers.

As I have explained before there is no reason to worry about the cement going into the high porosity dolomite since the cementing is being done above the pay zone.

I do not think there is any plan to drill a horizontal hole at this location but it is just a simple side track at a relatively small angle. This is based on OSH’s comment that the planned TD is 2,375 meters.

We do not know if the 5” liner will just cover perforations in the bottom of the 7” liner, will come up above the top of the 7” liner or come all the way to the surface. I expect that it is the penultimate. A well at this location will have the capability to be prolific producer but at Antelope-4 ST-1 the size of the open hole and tubulars might restrict the flow somewhat. It will still be capable of respectable flow rate.  I don’t think any of the wells drilled to date have been prepared  to be producers but they can be prepared for that purpose. I am thinking they will want the wells to be capable of  producing up to 200 MMCFD each. They will probably need to revise the casing program and plan to use 7” production tubing. I doubt that Antelope-4 ST-1 will be utilized as a producer due to the down hole configuration (shallow side track) ,size of the tubulars and hole size. The well should partially accomplish its purpose i.e. evaluate the quality and extent of the dolomite on the south flank of the field. Based on their last map the well will not be able to find the limits of the field to the south.

Here is a bonus for you. When we talk about prolific wells , remember the high flow rates at Antelope-1 and Antelope-2 and now find that Antelope-5 produces 60 MMCFD with a drawdown of about 2 psi , I believe this has significant implications for the resource volume calculation. Why? Because the wells have such a high deliverability and minimum pressure drawdown that the reservoir can be produced to a much lower abandonment pressure than most other reservoirs.

Have a good day!!

[jft310]

GCA will only give credit for drilled wells not just seismics . But GCA might accept the flow tests/ pressure tests results from what we have drilled and give us credit . Appears we will not get to know the Southern or Western boundaries in this round of drilling . Netherland Sewell will use seismic in their estimate . Therefore an average of two if these are the two Interoil engineers would bump up GCA conservative work . For sure these are the two Oil Search engineers .

[sageo]

Pet - Thanks for correcting  my post with your words " cementing is being done above the pay zone". (I guess the old brain hits a blank spot every now and then...ha,ha.)  Stay well and please keep your great thoughts "a-comin' " . They are always benificial to our cause.