Reworking a vertical well.
By todays standards, with all the current technology (smaller mud motors ?, etc. ) , what is the minimum size, that casing needs to have been installed, to allow an operator to come back and add a lateral to a vertical well and turn it into one of those Haynesville Shalegators ?
One of the reasons I ask is because I have read several times on here where the point was made about pipe size making a rework on a particular well impossible.
People are being told that they are coming back to rework said wells yet the casing size seems entirely too small for directional drilling on these wells. "If" a mud motor is 7.5", then 5.5" casing wouldnt be big enough. Another question that comes up is due to pipe thickness or weight. Is there a minimum there as well ? Knowing this would greatly help when using Sonris to try and identify prospective targets for reworking well locations.
Thanks.
One of the reasons I ask is because I have read several times on here where the point was made about pipe size making a rework on a particular well impossible.
People are being told that they are coming back to rework said wells yet the casing size seems entirely too small for directional drilling on these wells. "If" a mud motor is 7.5", then 5.5" casing wouldnt be big enough. Another question that comes up is due to pipe thickness or weight. Is there a minimum there as well ? Knowing this would greatly help when using Sonris to try and identify prospective targets for reworking well locations.
Thanks.
Views: 62
Replies to This Discussion
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Permalink Reply by CR on
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Snake,
I'm certainly no expert on this but I was told once that anything over 7 inches would allow for rework. Every well I've checked lately has 9 to 11 inch so the 7 may not be a good number any more.
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Permalink Reply by The_Baron on -
Your probally looking at the surface casing. CHK is using 10 3/4" surface pipe, with 7 5/8 production casing in the vertical shaft with 5 1/2" on the lateral.
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Permalink Reply by Snake Stewart on
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When I looked at the deeper part of the verticals, say from 1,825' to 9720' on the Wintamute 31 (S# 224787) the info shows 4.5" casing.
Surface to 1,825' is 8.58".
Then they also show 2.38" tubing at 9467' and a packer depth at 9450'. I am fairly sure this is used for perforations and or frac but would this be in the way of future mud motor ? The second level of casing (4.5") made me question whether or not there would be room or not. The 2.38" tubing certainly caused me to doubt the chances of this being reworkable. Any insight is appreciated guys and gals.
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Permalink Reply by Dion Warr, CPL on
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Snake:
Vertical bores on intended lateral completions follow the same i.d. on production casing as quoted by Baron above. Considering the kickout on the radius runs 7 5/8" - 7 7/8" bore diameter, tending to 5 1/2" and 4 1/2" on the lateral with 2 3/8" tubing capable of operating at pressure, the next size down (5 1/2" / 3 1/2" - 4"(?) / 1 1/2" tubing(??)) at pressure would be difficult if not impossible IMHO. Not even sure if they fabricate steel at such a small diameter rated at high pressure.
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Permalink Reply by BirdDawg, plain ole' idiot on
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Wrough wro
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Permalink Reply by Lerret on
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Slim hole motors tend to be less reliable and there are smaller motors than 7.5" but a conventional completion may not be amicable to recompletion for a number of reasons.
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Thanks Lerret,
Would you like to expound ?
Please do.
When drilling money is theonly, main reason (cheaper to rework then redrill ?), it tends to make one wonder why more isnt done to make it more amicable.
Thanks
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