In recent discussions we have touched on the impact of faults on HA/BO lateral placement and on the possibility that the closure of NW LA lignite mines might open some sections previously closed to development.  In my work today, I ran across a unit plat for alternate wells that illustrates both instances.  Faults that have sufficient "throw" to show up on basic play maps run from the NE to the SW.  Since the approval of cross unit laterals a number of units have been formed or reconfigured to allow long laterals that have a "toe" in close proximity to the area of the fault.  A few of those wells that we have discussed have exhibited unusually reduced early decline rates in comparison to the average HA/BO horizontal well and we have speculated that the area of faulting creates an extensive area of natural fracturing that the well would communicate with.  In other similar plats, multiple wells would have their bottom hole locations staggered along the diagonal boundary of the "fault' unit.

Also this particular plat shows the northern "fault" unit including the Oxbow Lignite Mine boundary and a cross unit well (HC) that includes lands inside and outside of the mine plan.

HA%20UNIT%20WITH%20FAULT%20-%20OXBOW%20MINE%20BOUNDARY.pdf

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Here is another example I pulled off my Commissioner's public hearing spreadsheet.

HA-BO%20Diagonal%20BH%20Well%20Group.pdf

A quick question, do you think that the two wells that cross the fault in 27,11n,10w communicating with fault and 8 wells in 28,11n,10w are drawing from fault. Seems like the two wells in sec 27, test roughly same as wells in 28 but but wells in 28 are producing ten times as much with much slower decline rate. if I was a betting man, I would guess that choke wasn't opened to what is stated. draw down of pressure isn't coming from well producing from 27,11n10w. Seems likely gas is going somewhere and it's not going to production of wells in 27. No being a gas man not sure on this, would like the thoughts of you guys. 

Jerry, my maps do not show a fault in Sections 27 or 28 and the well plats do not exhibit the staggered diagonal pattern, NE to SW, that usually indicates a well drilled up to a fault zone.  Frac cylinders are not uniform as much as operators would like them to be and there can be natural fracture zones not associated with a fault.  Only the operator might have an idea regarding the variance in decline.  Also the choke settings in the SONRIS well files are only accurate for the date of the DT-1 test.  We don't know what the choke setting might be in between test dates.

Thank you sir.

 Skip, do you have any information as to location of faults in area of sec 37,T11N,R10W. I have property in 34 (the part not paying any royalties) because of fault in area. But no one can tell me where the faults are. From talking to drillers who were drilling wells in ajax, I was told communication between wells when fracking was taking place. Just trying to get my head around why the rapid decline of gas in 27. In sec 28 wells are staggered  as you described and wells have been paying very well. any information is greatly appreciated

My maps do not show any faults near Section 37.  Frac hits (communication between wells) can serve to decrease formation pressures.  Less pressure, less production.  We read very little about Haynesville well communication generally only when it creates a serious problem that the Office of Conservation must address and therefore creating records and data in the public record.  The OOC has had to issue emergency compliance orders in some instances.

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