Wednesday, May 24, 2017

The Jury Is Still Out, But Horizontal Madison Well In Pratt Oil Oil Field Is Really Quite Remarkable -- May 24, 2017

Conventional, vertical Madison wells in the Pratt oil field northeast of Minot produce around 250 bbls/month maximum during the early years and decline gradually. After decades of production, few hit 75K bbls (total) of crude oil production. 

Pratt oil field, vertical Madison wells: file number, test date; max monthly production; total cumulative --
  • 12828, 7/90, 905 bbls, 41K, now AB,
  • 12645, 7/89, 196 bbls, 22K, now AB,
  • 12553, 5/89, 151 bbls, 10K, still A, producing 3 - 4 bbls/month,
  • 12449, 9/88, 870 bbls, 70K, still A, producing 125 bbls/month,
  • 12461, 8/88, 566 bbls, 36K, still A, producing 25 bbls/month,
  • 12448, 7/88, 571 bbls, 67K, now IA,
  • 3696, 10/64, 770 bbls, 89K, still A, producing less than 3 bbls/month,
  • 3315, 2/63, 1321 bbls, 128K, now IA,
  • 3298, 12/62, dry
Now, compare that with recent horizontal well in the same oil field, same formation:
  • 33156, 439, Sedalia Energy, Pratt Madison Unit 3H, Pratt, t1/17; cum 24K 3/17; note: at this post, a graphic showing how Sedalia Energy drilled three laterals from one Madison well;
Madison wells are not fracked; no stimulation. In addition, these have been short laterals, so far. Vertical depth at 4,000 feet is about half that of a Bakken well. Madison wells typically don't have the "dreaded" Bakken decline rate. Shallow, short laterals, no fracking, and steady production over many years; previously Madison wells were simply vertical wells; now horizontal wells.
This is really quite a nice well, Sedalia, #33156 (production profile updated July 27, 2017):

PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
MADISON6-2017306161605839770000
MADISON5-2017316661670640892000
MADISON4-2017307786779042191000
MADISON3-2017319087937446420000
MADISON2-201728114391100545914000
MADISON1-2017113586333536484000

Pratt oil field:

  
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Vertical vs Horizontal Madison Oil Wells In Pratt Oil Field

First six months of three vertical Pratt oil field wells. NOTE "RUNS" in the vertical wells for the first three months - zero bbls (which I don't understand). Again, file number, date tested, maximum production in any single month, status:

3315, 2/63, 1321 bbls, 128K, now IA:
MADISON4-19632910620685000
MADISON3-19632313210423000
MADISON2-1963139170299000

3696, 10/64, 770 bbls, 89K, still A, producing less than 3 bbls/month:
MADISON12-1964316680922000
MADISON11-19643077001055000
MADISON10-1964165290530000

12449, 9/88, 870 bbls, 70K, still A, producing 125 bbls/month:
MADISON11-19882761201789000
MADISON10-1988296390900000
MADISON9-1988298700580000

Compare with the recently reported horizontal Madison well in the same field (repeated from above):
PoolDateDaysBBLS OilRunsBBLS WaterMCF ProdMCF SoldVent/Flare
MADISON3-2017319087937446420000
MADISON2-201728114391100545914000
MADISON1-2017113586333536484000


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Madison Formation

The Madison formation is tracked here. It should be noted that there are many incredible vertical (conventional) Madison wells in North Dakota. Some of these Madison wells are tracked over at "Monster Wells."

Just one example:
  • 7274, 1,100/PA, Whiting, Big Stick (Madison) Unit 2502, Big Stick, t5/80; cum 2.05 million 11/94 
Production from this well for two years back in 1981 - 1982 (fourth column is monthly oil production in bbls/month):
MADISON12-19823130129302421624359713555025
MADISON11-19823031236314449253195830866651
MADISON10-198231333493315083045992428752577
MADISON9-1982303269532622218146864412325062
MADISON8-1982313502735365214455837539111332
MADISON7-1982313706636951274851541461414701
MADISON6-19823036167358697654351542259722
MADISON5-1982313955540583109550177449414726
MADISON4-1982303908537964120546243423723409
MADISON3-1982313970439687100637163367070
MADISON2-198228365133664786235988341571414
MADISON1-198231432564311389433240328020
MADISON12-198131431354342384837243368350
MADISON11-1981304263442294452379143743076
MADISON10-198131440724427623237533360011109
MADISON9-198130418384164246137171367510
MADISON8-198131422644228026541021405440
MADISON7-19813146920469222719242045386372973
MADISON6-198130368183679532602820527587412
MADISON5-1981313841839090745437772351362399
MADISON4-198127355833492058052250221349748
MADISON3-198131330253299132753515334036652
MADISON2-198128348923567929010791103710
MADISON1-1981314080040148175729531278481218

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