Petroleum and Natural Gas Fields in Wyoming Page: 75
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REVIEW OF OIL AND GAS FIELDS
covery well, in the C NW1/4,NW1/, sec. 16, was
completed in June 1954. The well was drilled
to 8,656 feet in the Dakota sand. The pro-
ducing interval was in the Newcastle sand
from 8,452 to 8,474 feet. A second well drilled
in the field was completed as a dry hole. Oil
production from the field was 2,939 barrels in
1956. Cumulative production to the end of
1956 was 6,291 barrels of oil.
Rankin.-This area has been designated as T.
39 N., R. 65 W., Niobrara County. The dis-
covery well, in the C NE1,NE1/4 sec. 20, was
completed in May 1954 for an initial daily oil
production of 50 barrels. The producing zone
was the Newcastle sand from 7,538 to 7,551
feet. No other wells were drilled in the area.
The discovery well was abandoned in 1954.
after producing 550 barrels of oil.
Rochelle.-This area (fig. 46) is in T. 42 N.,
R. 67 W., Weston County, just west of the
Blank Thunder Creek area. The discovery
well, in the C SWI/SE1 , sec. 2, was com-
pleted April 8, 1954, for an estimated daily
open flow of 800 barrels of oil. The oil came
from the Newcastle sand at 7,436 to 7,447 feet.
Five other wells subsequently drilled in the
field had initial daily production ranging from
21 to 140 barrels of oil.
Reported oil production from the Rochelle
area during 1956 was 14,508 barrels. Cumula-
tive production to the end of 1956 was 124,063
barrels of oil and an estimated 212 million
cubic feet of gas produced with the oil.
Wagonhammer.-This area is in T. 40 N., R.
67 W., Converse and Niobrara Counties. The
one well drilled in the field (in the C NE1/4
SW1/4 sec. 1) was completed in April 1954
for an initial daily flow of 360 barrels of oil.
The oil came from the Newcastle sand at 8,204
to 8,212 feet. The only oil production re-
ported from the field was 2,126 barrels in 1954
and 2,078 barrels in 1955.
Long Green.-This area is designated as T. 38
N., R. 65 W., Niobrara County. The one oil
well in the field was completed in April 1954
for an initial daily production of 32 barrels of
330 API gravity oil. The well was in the
SE1/4NE1/4SE1/4 sec. 11. The producing in-
terval was 7,089 to 7,123 feet in the Newcastle
sandstone. A second well drilled in the NW1/4
sec. 13 was abandoned as a dry hole.
No oil production has been reported from
the Long Green area. It is presumed that the
discovery well has been abandoned.
The Clark Ranch field (fig. 47) is in sec. 6,
T. 35 N., R. 84 W., and sec. 1, T. 35 N., R. 85
W., Natrona County. It is about 1 mile east
of Powder River, Wyo. The structure is a
small, faulted, dome-shaped anticline. Oil
accumulation is thought to be in fault-trap
reservoirs on the flank of the anticline. The
area was studied by seismic methods before
drilling. The Cody shale is exposed on the
surface at an average elevation of 5,707 feet.
The discovery well in the Clark Ranch field,
in the C SE1/4,NW1/4 sec. 6, was completed in
June 1955. It had an initial production by
pumping of 105 barrels of oil. The productive
horizon was the Tensleep sandstone from 4,678
to 4,695 feet. The No. 2 unit well in the C
NW'ASW1 sec. 6 was completed in August
1955 with an initial daily rate by pumping
of 430 barrels from the Curtis sand. This
sand is in the Chugwater formation and may
R. 85 W.
R. 84 W.
S . T.
WELL STATUS, I - 1- 58
OIL WELL, CURTIS
GAS WELL, FRONTIER
+. DRY HOLE
FIGURE: 47.-Map of Clark Ranch Field, Natrona
correspond to the Curtis sand of the Big
Horn Basin area. The producing interval was
3,188 to 3,234 feet. The Tensleep sandstone
in this well contained water. The No. 3 unit
well, in the N1/2SE1/4SW1/4 sec. 6, was com-
pleted in September 1955 as a gas well in the
Frontier formation. All zones below the Fron-
tier were barren or contained water. Initial
daily open-flow volume was *2 million cubic
feet from 915 to 920 feet. Four additional
wells have been drilled in the field; of these,
three were oil wells in the Tensleep sandstone
and one a dry hole. The log of the No. 1 unit
well shows the depth, in feet, to the top of
formations as follows: Niobrara, 75; Carlile,
1,117; Frontier, 1,442; Mowry, 2,280; Ther-
mopolis, 2,590; Muddy, 2,608; Dakota, 2,722;
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Biggs, Paul & Espach, Ralph H. Petroleum and Natural Gas Fields in Wyoming, report, 1960; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc38797/m1/89/: accessed May 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.