Question on fracking S/L formations in the Shale--Bossier/haynesville----
If S/L H wells drilled off super pad 50 or so feet apart vertical holes with lateral legs one in Bossier and other in Haynesville. The thickness of bossier 150-200' and haynesville similar thickness 150-200'. How is it possible that the frac so close together does not go into the other and effect it and visa vera? How far out laterally from well bore of lateral leg will the frac carry fluid into the formation 360 degree from pipe? If the total shale B+H over 250-300 feet will the frac cross into the other formation? ie frac in Haynesville close to the Bossier--will frac go into the Bossier and drain it also or is there a blockade between formation that frac can not cross?? I assume they can see and map the frac thru seismic during fracking? Even though vertical the lateral legs only 50-100 feet different in depth, how far lateral are they typically separated so maybe this is not a problem??
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Replies to This Discussion
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Permalink Reply by Les Bamburg on -
JG, there is sufficient vertical separation to avoid communication of production from the two formations.
Placing two wells too close is not a good event. For example, insufficient spacing between Haynesville Shale wells could drop EUR's from 6 Bcf to 4 Bcf per well. Consequently operators do not design wells to intentionally bleed into each other. If it happens, it was likely a miscalculation.
For stacked laterals it is a mute point since there is more than adequate separation between the two target formations.
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Permalink Reply by Les Bamburg on
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JG, basically the TRRC seems to be treating the two stacked laterals as a single for regulatory purposes including a single allowable. This likely because the wells are an exception to field spacing rules.
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Permalink Reply by adubu on
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Les B--- I see statements all the time about field allowables---has this ever come into play on any shale NG unit that you are aware of todate?
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Permalink Reply by Les Bamburg on
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Adubu, I see the "allowables" setting in Texas and Louisiana for the Haynesville/Bossier Shale as a formality as I do not believe it will ever have an impact on actual well or unit production rates.
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Permalink Reply by adubu on
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Les B-- thanks confirms my thoughts---- I guess maybe way off in future if and when the field begins to get depleted like the old oil Woodbine fields in East Texas the RRC adjusts which wells could pump how many barrels a day or month and when. But then again I don't think one H well in the shale over a 50-100 years could drain a 640 acre unit like one well in a woodbine formation could slowly over time >100 years
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Permalink Reply by Les Bamburg on
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Adubu, I would say it has a low probability since individual shale gas wells do not effect overall recoveries in the same manner as conventiontional reservoirs. I also do not think the TRRC is as sensitive about gas wells as they are for oil wells.
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