Petroleum and Natural Gas Fields in Wyoming Page: 59
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REVIEW OF OIL AND GAS FIELDS
tion range of 6,000 to 6,020 feet on the north
high and 5,800 to 5,880 feet on the south high.
The field was discovered in 1918, when gas
was found in the Sundance sand. Fourteen
gas wells were completed in the Sundance for-
mation at 1,300 to 1,585 feet; initial daily
open-flow volumes ranged from 1 to 30 million
cubic feet of gas. The gas was piped to Cas-
per, Wyo., until the field was depleted in 1925.
One well yielded some oil, apparently from a
ring of oil between the gas and water, from
the Sundance formation; there was too little
oil, however, to warrant pumping. In June
1922 a well on the south high in the SW/4
N E1/4 sec. 30 was drilled to a depth of 2,532
feet in the Tensleep sandstone; it produced
200 barrels of 150 API gravity black oil.
From 1922 to 1929, 18 wells were completed at
2,400 to 2,500 feet in the Embar lime and Ten-
sleep sandstone; initial daily production
ranged from 65 to 200 barrels of oil. Some of
these wells were new, and others were depleted
gas wells deepened to these lower formations.
In 1937 an old gas well on the north high in
the SE1/4NE1/4 sec. 33 was deepened to the
Embar formation at 2,630 to 2,667 feet and
completed for an initial daily production of 130
barrels of oil. A log of a well on the crest
of the north high gave the following depth, in
feet, to the top of the various formations:
Muddy, 590; Dakota, 770; Morrison, 880;
Sundance, 1,095; Chugwater, 1,490; Embar,
2,280; Tensleep, 2,660; and Amsden, 2,825.
Between 1941 and 1947 nine newly drilled
or deepened wells were completed in the Ten-
sleep sandstone, making a total of 27 produc-
ing wells in the Embar-Tensleep zone. The
oil production in January 1957 was 500 bar-
rels a day; for comparison, 550 barrels a day
was produced in June 1938. The 26 wells pro-
ducing in January 1957 were reported as Ten-
sleep sandstone wells. The wells are being
pumped, although there is enough hydrostatic
pressure in the Tensleep sandstone for some
oil to be flowed. After being heated to 160 to
180 F., the well effluent is treated in electric
dehydrators to separate the oil and water.
Fuel for some of the lease operations is ob-
tained from the six remaining gas wells.
Analyses of the dehydrated oil from the
Tensleep sandstone, gas from the Lakota and
Sundance formations, and water from the
Sundance and Tensleep formations are given
on page 350, and in tables 8 and 9 (pp. 288
and 293, respectively).
During 1956, 186,008 barrels of oil was pro-
duced; cumulative production to the end of
1956 was 5,821,166 barrels of oil. The total
gas production from 1920 to 1927, inclusive,
was 11.4 billion cubic feet.
All the oil is trucked to a refinery at Casper,
Wyo. The 6-inch pipeline from the field to
Casper, Wyo., was taken up during World
The Castle Creek field is in secs. 13 and 24,
T. 38 N., R. 81 W., and sec. 31, T. 38 .N., R. 80
W., Natrona County. The structure is re-
ported to be an anticline. The Steele shale is
exposed at the surface at elevations ranging
from 5,355 to 5,470 feet.
The field was discovered in January 1948,
when a well in the NE1/4 sec. 24 produced, by
swabbing, 11.5 barrels of oil and 4 barrels of
water a day from the Third Wall Creek sand
between 2,265 and 2,272 feet. The ground
elevation at the well was 5,386 feet. The first
reported drilling on the structure was in 1915.
A well drilled in 1918 tested the Lakota and
found a show of gas and water. The first com-
mercial oil well was completed in August 1949
in the SW1/4 sec. 13 for an initial production
of 60 barrels of oil a day, by swabbing. The
API gravity of the oil was 22.
Gas was discovered on October 7, 1952, in a
well in the NE1/4 sec. 31, T. 38 N., R. 80 W.
Initial daily open-flow volume was 2.5 million
cubic feet from the First and Second Wall
Creek sands. Production was from perfora-
tions in the casing from 1,933 to 1,934 feet
(First Wall Creek) and 2,421 to 2,437 feet
(Second Wall Creek).
The log of an abandoned well in sec. 22, T.
38 N., R. 81 W., shows the depth, in feet, to
the top of formations as follows: Niobrara,
975; First Wall Creek, 1,820; Second Wall
Creek, 2,165; Third Wall Creek, 2,315;
Mowry, 2,464; Muddy, 3,035; Dakota, 3,175;
Lakota, 3,253; Morrison, 3,354; Sundance,
3,468; Basal Sundance, 3,875; Chugwater,
3,980; Embar, 4,600; and Tensleep, 5,012.
Analysis of oil and water from the Third Wall
Creek sand is given on page 350 and in table 9
(p. 293), respectively.
By January 1957, 20 wells had been drilled
in the Castle Creek area. Of these, 6 produce
oil, 1 is a shut-in gas well, and 13 were aban-
doned as failures. Cumulative production to
the end of 1956 was 22,317 barrels of oil.
The area was unitized in 1946 as the Castle
Creek unit with an area of 9,200 acres.
The Church Buttes gasfield (fig. 36) is in
Tps. 16 and 17 N., Rs. 112 and 133 W., Sweet-
water and Uinta Counties, near the center of
the Green River Basin. The structure is an
elongated, closed anticlinal feature approxi-
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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/m1/73/: accessed May 29, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.