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Drilling Adjacent Units with CULs



Started March 15, 2017 at 11:14 am by @JM in GoHaynesvilleShale

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JM
03/15/17 11:14:44AM
@jm

Is it reasonable that if a company controls 3 adjacent units North to South, and is motivated, that they could drill a cross unit lateral to produce the southern 2 units.  Then after that completion, turn around and drill and produce the northern unit, all from the same 6 acres well site?  I would think challenging from the same site.  

Skip Peel - Independent Landman
03/15/17 11:16:07AM @skip-peel-independent-landman:

No challenge.  Happens regularly these days.


James W. Mangham
03/15/17 11:42:03AM @james-w-mangham:

In this case they are working from two pads, both in the center of the center section.  The original permit showed a total of eight wells from a single pad, four north and four south.  The four spud ins located on two different pads are marked as all going north.  Perhaps they plan to immediately do four to the south after the four northerly wells are completed.


Skip Peel - Independent Landman
03/15/17 11:46:17AM @skip-peel-independent-landman:

james, are you referring to a notice letter for alternate unit well spacing?


James W. Mangham
03/15/17 11:57:35AM @james-w-mangham:

Yes, one of those notices about a hearing in Baton Rouge.

The original notice was from Encana before the rigs left Red River Parish a few years ago.  One complete well pad prep was sitting idle all that time.


Skip Peel - Independent Landman
03/15/17 12:01:15PM @skip-peel-independent-landman:

Just be aware that approval of alt unit well spacing is not a permit to drill and does not come with a time limit.  The operator will need to separately permit each well.  Similar group alt well designs have become much more common since late 2016 and HA operators will need to add rigs or it could be some months before all these wells get spud.  Good luck.


JM
03/15/17 12:25:17PM @jm:

My question is just a hypothetical.  If a site is on the section line and a company drilled a cul or even multiple culs in a southern direction, could at some point the same well site be used to drill north to develop a different unit.  How many well heads is too many for a 6 acre site?


Skip Peel - Independent Landman
03/15/17 12:32:55PM @skip-peel-independent-landman:

Drilling multiple horizontal wells in both directions from the same pad has been quite common for several years.  At just a guess a six acre pad might allow as many as 8 wells.  There are significantly larger pads in Lincoln Parish with up to sixteen wells on a single pad.  Doesn't matter whether the pad is on or near a section line.


dbob
03/15/17 10:56:04PM @dbob:

The limiting factors are spacing between laterals and the size of the frac package.  

When spacing between laterals gets wide, its hard to justify the complexity/cost of drilling the laterals furthest out from the center, if a readily suitable alternative is available.  Hypothetically, well spacing at 600 feet (Total spread for 4 wells in 1 direction, 1800 feet) is not a problem.  If spacing is 1200 feet between laterals, that same 4 wells has a horizontal spread of 3600 feet and the operator may not want to do that.  

The drilling rig only really needs about 1/2 of a 6 acre pad, assuming it is free of obstructions likely tank batteries and geometry is reasonable for assembling the rig.

The frac equipment, OTOH, will fill the entire pad on most modern fracs, if done on a 6 acre pad.  Packing any tighter together is not really practical.  Although not preferred, if you have an adjacent contiguous work area for staging, you can probably fit under 6 acres.  If however, you get meter runs, tank battery, separation equipment, line heater or gas cooler on a site with 4 wells, then want to frac 4 more wells, it may not be enough space.  


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