Petroleum and Natural Gas Fields in Wyoming Page: 76
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PETROLEUM AND NATURAL GAS FIELDS IN WYOMING
Fuson, 2,740; Lakota, 2,800; Morrison, 2,870;
Sundance, 3,090; Nugget, 3,325; Jelm, 3,525;
Alcova, 3,596;,Chugwater, 3,620; Dinwoody,
4,280; Phosphoria, 4,380; Tensleep, 4,644; Ten-
sleep porosity, 4,678; and Amsden, 4,948.
Analyses of oil from the Curtis and Tensleep
formations and gas from the Frontier forma-
tion are given on pages 357 and 358 and in table
8 (p. 288), respectively.
Oil produced at Clark Ranch amounted to
59,773 barrels in 1955 and 113,610 barrels in
1956. No gas has been reported sold at the
field. The oil can be trucked from the field
or shipped by railroad tank car.
The Clark Ranch unit plan was approved by
the Secretary of the Interior on April 20, 1955.
The Cole Creek field (fig. 48) is in T. 35 N.,
R. 77 W., Natrona County. It is near the
southern end of a major northwest-southeast
folded area, approximately 45 miles long,
which includes the Shannon field on the north
and the South Cole Creek field on the south.
The Cole Creek structure is a large, symmetri-
cal fold with about 500 feet of closure. Recent
sand dunes cover much of the surface and
obscure surface indications of a structure. The
Lance formation is exposed on the surface at
an elevation of 5,600 feet.
Cole Creek field was discovered in 1938,
when a well in the C NW1/4SE1/4 sec. 21 was
completed in the Lakota sand at 7,978 to 8,016
feet. Initial daily production was 240 barrels
of 350 API gravity oil. The Shannon sand-
stone in the discovery well appeared to be oil-
stained and porous. In 1941 a well in the
NW1/4 sec. 21 was completed with an initial
flowing production of 600 barrels a day of
36.30 API gravity oil from the Shannon sand
at 4,530 to 4,570 feet. The Dakota sandstone
was proved oil productive in 1943. Most of
the wells drilled to the Lakota were plugged
back to the Dakota sandstone because of ex-
cessive water production with the oil from the
The Muddy sand was productive in a well
in the C NE1/NW1/4 sec. 4 completed in
March 1955. Initial production was 30 barrels
of 40 API gravity oil a day. Cores of the
Muddy sandstone show it to have about 5 per-
cent porosity and less than 1-millidarcy per-
The log of a well drilled in the SEI4 sec.
16, near the crest of the structure, shows the
depth, in feet, to the top of formations as fol-
lows: Fox Hills, 1,655; Lewis, 1,800: Mesa-
verde, 2,208; Shannon sand, 4,490; First Wall
Creek, 6,690; Second Wall Creek, 7,060; Da-
kota, 7,931; and Lakota, 7,984. By January
1, 1958, there were 40 producing wells in the
field; 14 were completed in the Dakota-Lakota,
25 in the Shannon sand, and 1 in the Muddy
It was decided that the producing bottom-
hole pressure at the datum of 1,075 feet above
sea level should be maintained at 600 p.s.i.a.
or higher to increase the recovery of oil from
the Shannon sand. In February 1946 injec-
tion of water into the Shannon sand was begun
to maintain the bottom-hole pressure.
At the start of the water-injection program,
the wellhead pressure was 50 p.s.i.; after 60
days it was 150 p.s.i.; and after 6 months it
was 175 p.s.i. Cumulative water injection to
January 1, 1958, was 3,305,343 barrels. Seven
Shannon wells are used as injection wells. Sur-
face injection pressure averaged 350 p.s.i. in
During January 1958 the daily production
by formations was as follows: 470 barrels of
oil and 85 barrels of water from 14 Dakota-
Lakota wells; 5 barrels of oil from 1 Muddy
well; and 650 barrels of oil and 250 barrels of
water from 25 Shannon-sand wells. Cumula-
tive production for the field to the end of 1.956
was 7,998,966 barrels of oil. Andayses of oil
from the Shannon, Muddy, Dakota, and La-
kota are given on pages 358 to 360. Analyses
of gas from the Shannon and water from the
First Wall Creek, Shannon, Lakota, and Lance
formations are given in tables '8 and 9 (pp. 288
and 293, respectively).
The oil is piped through a 4-inch pipeline
to Casper and an 8-inch pipeline to the Serv-
ice Pipeline near Glenrock.
A unit agreement for developing and oper-
ating the Cole Creek field was approved by
the Secretary of the Interior on September 1,
SOUTH COLE CREEK
The South Cole Creek field (fig. 49) is in
secs. 5, 6, 7, 8, 16, 17, 18, 19, and 20, T. 34 N.,
R. 76 W., and secs. 31 and 32, T. 35 N., R. 76
W., Converse County, about 3 miles north of
the Big Muddy field. The structure is an
anticlinal fold which is a continuation of the
Cole Creek structure. They are separated by
a low structural saddle. Sands and shales of
the Lance formation are exposed on the sur-
face.at an average elevation of 5,300 feet.
The first well on the structure was drilled
in 1942 to 7,214 feet in the Frontier formation.
It was abandoned after testing of a noncom-
mercial show of oil in the Shannon sand. Unit
well No. 1, in the SWl/SWl/NWl sec. 17,
was completed in September 1948 for an ini-
tial daily flowing production of 375 barrels
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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/m1/90/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.