Sunday, August 7, 2011

Another Trivial Note on the Silurian Formation -- North Dakota, USA

Another interesting well:
  • 7566, IA/682, Hess, T.P. Riggs 15-31, spud in 1980; test date 2/4/1981; cum 858,98 bbls 7/11;
This well continues to produce (on a pump) although since December, 2010, it looks like it might have been shut in.

This was another Silurian formation well. I talked about Silurian wells back on July 17, 2011.

This Silurian well was spud back in 1980 and has been active for 30 years.

I find it amazing how these companies can tease the oil out of the formation when it looks like production is dropping:

1. 1981 time period -- note the horrendous decline rate, which is also seen in the Bakken:
SILURIAN4-1981309967988380018667186670
SILURIAN3-198131140301409476926149261490
SILURIAN2-198128165101572584025958259580

2. 1983 time period -- for some reason, production was shut down for part of a couple months, and then brought back up, producing at similar levels when first spud:
SILURIAN1-1984301441513895163022221222210
SILURIAN12-1983311601615963221626659266590
SILURIAN11-19831771557118170012405124050
SILURIAN10-1983119351081397232823280

3. 1991 time period -- now it's getting serious. But then they go back in and manage to get production back to very good levels; this well was now 10 years old:

SILURIAN8-199129534755741762896089600
SILURIAN7-199114481146012031745574550
SILURIAN6-1991000035350
SILURIAN5-1991000044440
SILURIAN4-1991000013130
SILURIAN3-1991000010100
SILURIAN2-1991256217032320
SILURIAN1-199110106005454

4. This year -- are we finally going to see the well abandoned? Or will see yet another comeback?

SILURIAN2-201100002752750
SILURIAN1-201116262158580
SILURIAN12-2010282732657856086080
SILURIAN11-2010303913709227577570

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Another Silurian well in the neighborhood as the one above:
  • 7571, 482, Hess, Reitsch NCT-2 4, Blue Buttes, t4/81; cum 997,798 bbls 8/14;
This well was spud in 1980; test date 4/3/81. and continues to produce, on a pump. This well has also celebrated its 30th birthday. Incredible.
****************

By the way, another spectacular well in the same neighborhood:
  • 9057, 731, Hess, Riggs 10-31, Blue Buttes, Stonewall formation, t5/85; cum 808K 8/14;
This well was spud in 1981; test date 5/5/85. and continues to produce, on a pump. It targeted the Red River formation, which was DRY, and then targeted the Stonewall formation, which is still producing, on a pump. Again, incredible.

2 comments:

  1. Yup, I just saw that and posted a stand-alone note about that milestone.

    http://milliondollarway.blogspot.com/2011/08/187-rigs-new-record-up-by-three.html

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