I have been under the impression that a well designation such as #1 means the well is vertical, #1H means the lateral is in the Haynesville shale formation (also called the lower Bossier) and #1HB means the lateral is in the Bossier Shale formation. Now there are some wells designated #1 HU. For example:

Aethon Energy KVG-Knox Alloc #3HU (API # 405-30709)

BP America Wallaby #6HU (API 405-30704)

BP America Rhea #2HU (API 347-33405)

Does anyone know what the "HU" designation means. I suppose it could mean that the Bossier could be thick enough to have laterals at three depths and HU signifies Upper Bossier, but that is just a guess. I was curious to see if anyone knows the actual meaning. 

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I've noticed it but don't know what it designates. I thought it was just a BP thing, at first, but then Aethon permitted one with that same HU. I'll send an e-mail to RRC and see what they tell me.

Thanks. I recall that when Cabot Oil and Gas drilled the vertical well von Goetz #1 about two miles north of the Thomas cemetery on HWY 21 about 9 or 10 years ago, that on the next earnings call the President of Cabot said in response to a question that the shale was over 900 feet thick and had 9% gas bearing porosity. And that they couldn't tell the difference in the Bossier shale and the Haynesville shale. That made me think that it might be possible to have wells at three different levels instead of just two.

There is usually about 500' of separation between the Bossier which is the basal member of the Cotton Valley Sand Group and the Haynesville.  Where either is sufficiently thick, say 300' or more, it is possible to have more than one "landing zone".  As operating companies learn how their frac cylinders propagate, the may adjust their lateral landing zones.  In some parts of NW LA there are upper and lower Haynesville wells.  At first it seemed that operators might be labeling the Bossier as upper Haynesville but that does not appear to be the case now as there is insufficient separation between the two zones.As far as I know these instances are not wide spread.  It should be noted that the current completion designs with high intensity stimulation can break more rock and create a larger frac cylinder.  This also informs the preferred landing zones.

Check out the SONRIS dictionary.  It may have the answer for you.

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