Petroleum and Natural Gas Fields in Wyoming Page: 78
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PETROLEUM AND NATURAL GAS FIELDS IN WYOMING
of oil from the Lakota sand. The productive
interval was 8,288 to 8,320 feet. Oil-saturated
zones in the Dakota sand were logged in the
first wells drilled at South Cole Creek field.
Unit well No. 5, in the SW4SW4SSW1/4 sec.
8, recovered water on tests of the Lakota for-
mation. It was plugged back to the Dakota
sand from 8,309 to 8,339 feet and completed in
June 1950. Initial daily production was 85
barrels of oil.
During October 1951 a well in the SW1/'
NE1/NW1/4 sec. 19 was completed for an ini-
tial production of 140 barrels of oil from the
muddy sand. The producing zone was 9,013
to 9,031 feet. Both the Dakota and Lakota
sands contained water in this well. The log of
a well in the SW/lNW1/4NW1/4 sec. 17 shows
the depth, in feet, to the top of formations
as follows: Lewis, 1,945; Mesaverde, 2,430;
Steele, 2,918; Shannon sand, 4,895; Niobrara,
6,272; Frontier, 7,012; Mowry, 7,644; Muddy,
8,096; Skull Creek, 8,115; Dakota, 8,218;
Fuson, 8,267; Lakota, 8,296; Morrison, 8,331;
Sundance, 8,623; Basal Sundance, 8,755; Al-
cova lime, 8,824; Chugwater, 8,853; Embar,
9,450; and Casper, 9,810. Analyses of oil from
the Muddy, Dakota, and Lakota are given on
pages 360 and 361. Analyses of gas from the
Dakota and water from the Shannon and
Lakota are given in tables 8 and '9 (pp. 288
and 294, respectively).
To the end of 1957, 46 oil wells had been
completed in the South Cole Creek field. Of
these, 1 was in the Muddy sand, 35 in the
Dakota, and 10 in the Lakota..
During January 1957 the oil produced at
the field averaged 1,583 barrels a day. During
1956, 643,671 barrels of oil was produced;
cumulative production to the end of 1956
totaled 6,679,877 barrels. Oil from the field
enters an 8-inch pipeline to Glenrock or a
4-inch line to Casper.
The South Cole Creek unit plan was ap-
proved by the Secretary of the Interior on
April 7, 1948. As the field was developed, 15
wells were completed outside the unit.
The Coon Creek oilfield is in sec. 22, T. 55
N., R. 97 W., Big Horn County, about 3 miles
south of the Byron and Garland fields. The
area was studied by seismic methods before
drilling. A southeast-plunging nose off the
Garland anticline was indicated. The Fort
Union formation is exposed in the badly
eroded shale hills. The elevation of the one
well is 4,355 feet.
The discovery well, the No. 2 Gov't., in the
NE1/SE1/NE1/4 sec. 22, was completed April
14, 1953. Initial daily production by pump-
ing was 29 barrels of 440 API gravity oil
from the First Frontier sand at 4,612 to 4,633
feet. The log of the No. 1 J. E. Pepper well
in the NW NW1/NE1 sec. 26, shows the
depth, in feet, to the top of formations as fol-
lows: Cody, 2,872; Frontier, 4,736; First Fron-
tier sand, 4,808; Second Frontier sand, 4,872;
Peay, 5,145; Mowry, 5,241; Thermopolis, 5,572;
Muddy, 5,847; Dakota silt, 6,065,; Dakota sand,
6,087; Morrison, 6,265; Sundance, 6,649; Gyp-
sum Spring, 7,068; Chugwater, 7,125; Din-
woody, 7,681; Phosphoria, 7,705; Tensleep,
7,965; and Madison, 8,175. Analysis of oil
from the First Frontier is given on page 362.
Three wells have been drilled in the field,
of which one produces oil and two were aban-
doned as failures, as of December 31, 1957. In
January 1957 the one well produced 10 barrels
of oil a day. Cumulative production to Janu-
ary 1957 was 15,169 barrels. The oil is hauled
from the field by truck.
The Cooper Cove oilfield is in secs. 19 and
20, T. 18 N., R 77 W., Carbon County. The
structure is a small nose or dome on the Rock
Creek anticline. The Mesaverde formation is
exposed on the surface at an elevation of 7,660
feet. The structure map (fig. 50) shows 200
to 300 feet of closure on the top of the Dakota
sandstone. The oil-saturated sand in the Da-
kota group averages about 40 feet in the two
producing wells in the field.
The field was discovered in 1944, when a
well was completed in the NW1/4SW1/4 sec.
20 for an initial daily production of 153 bar-
rels of 33.4 API gravity oil. The producing
formation was the Dakota group from 4,834
to 4,912 feet (total depth). Later in the year
a second well was drilled and completed. In
the discovery well the depth, in feet, to the
top of formations was recorded as follows:
Shannon, 2,080; Niobrara, 2,900; Frontier,
4,075; Muddy sand, 4,725; Dakota, 4,834; Sun-
dance, 5,214; Basal Sundance, 5,281; and total
depth drilled, 5,347.
As of August 1956, the two wells in the
field were producing 53 barrels of oil and 500
barrels of water daily. During 1956, 21,160
barrels of oil was produced; the cumulative oil
production to January 1, 1957, amounted to
372,672 barrels. Analysis of oil from the
Cloverly formation is given on page 362.
The oil is pumped through a 4-inch pipeline
to Dutton Creek field, where it is fed into the
3-inch pipeline from Dutton Creek to Rock
River. At Rock River the oil enters the Fort
Laramie-Salt Lake City pipeline system.
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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/m1/94/: accessed April 29, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.