Petroleum and Natural Gas Fields in Wyoming Page: 41
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REVIEW OF OIL AND GAS FIELDS
sec. 17. Initial production was 58 million
cubic feet of gas a day from the Second Wall
Creek sand of the Frontier formation at 3,182
to 3,200 feet. The shut-in wellhead pressure
was 1,150 p.s.i. Later about 11 other wells
were drilled into the Frontier formation to
depths of 3,135 to 3,300 feet; 7 were gas wells
and 1 an oil well. Initial open-flow tests
ranged from 30 to 68 million cubic feet-a
combined initial open flow of over 300 million
cubic feet of gas a day. Shut-in wellhead
pressures ranged from 1,000 to 1,150 p.s.i.
The oil well, the lowest (structurally) pro-
ducing well in the field, was completed in 1929,
yielding 100 barrels of 20 API gravity green
oil a day. This well was reported to have been
plugged by sand or shale after a few days'
production and was abandoned. Water was
found in the Frontier formation in wells
drilled still farther down structure. Evidently
the Second Wall Creek sand contains gas on
top of the structure above a thin band of oil
A deep-test well was drilled in 1937 on the
crest of the structure to 7,775 feet in the Big-
horn dolomite. The depth, in feet, to the top
of formations in this well was reported as
follows: Shannon, 862; First Wall Creek,
3,160; Second Wall Creek, 3,665; Lakota,
4,613; Morrison, 4,637; Sundance, 5,047; Em-
bar, 6,178; Tensleep, 6,258; Amsden, 6,570;
Amsden sand, 6,715; Madison, 6,848; Big
Horn, 7,260; and Bighorn sand, 7,755. No
showings of oil were reported, and the well
was plugged and abandoned. Analysis of gas
from the Second Wall Creek sand is given in
table 8 (p. 287). Analyses of water from the
Shannon and First Wall Creek sands are given
in table 9 (p. 293).
In December 1956 there were three active
wells in the field. These wells are injection
wells during the summer months and produc-
ing wells during the winter. Although at
least three of them had oil shows, no oil has
been produced from the field. Total gas pro-
duction to January 1957 was 4,704 million
An 8-inch line was laid from the field to
Buffalo and Sheridan, Wyo., in 1930. By 1939
the field was not able to supply the required
gas, and a 6-inch line was laid from Midwest
to Kaycee and a 4-inch line from Kaycee to
the field. At first this line was used only to
increase the gas supply during periods of
heavy withdrawal. For the past few years
the Billy Creek field has been used as a storage
reservoir in the warmer months, and gas is
withdrawn only in winter.
Bison Basin (formerly Buffalo Basin) in the
northwest part of T. 27 N., R. 95 W., Fremont
County, is a faulted, dome-shaped structure
(fig. 24). The axis trends almost east-west.
The area was located by surface geologic
methods. The Niobrara shale is exposed on
the crest of the structural high in sec. 17 at
elevations of 7,000 to 7,250 feet.
In 1923 a well was drilled in the NE1/4
NE1/SW14 sec. 17 through three sands in the
Frontier formation at 603 to 620 feet, 875 to
889 feet, and 1,040 to 1,062 feet. The initial
daily production was about 20 million cubic
feet of gas, with a shut-in wellhead pressure
of 100 p.s.i. As additional wells were drilled,
oil was found in the Frontier formation. In
March 1957 a well in the SE1/4SE1/4NW1/4
sec. 18 was completed in the Morrison forma-
tion. Initial daily production was 6 barrels of
oil and 6 barrels of water.
At the end of 1956 there were 17 oil wells
and 3 gas wells in the field. Oil production
in January 1957 averaged 107 barrels a day.
Analyses of oil and gas from the Frontier are
given on page 340 and in table 8 (p. 287), re-
spectively. Oil produced at the field in 1956
was 77,487 barrels. Cumulative oil production
to January 1, 1957, was 229,508 barrels. The
fact that oil has a gravity of 170 API and
must be hauled by truck has retarded opera-
tion of the field.
Black Mountain (fig. 25) is a sharply folded
anticline extending from the northwest corner
of T. 42 N., R. 90 W., into the southeast cor-
ner of T. 43 N., R. 91 W., Hot Springs County.
An idea of the topography of the area may be
gained from the contour map of the structure
(fig. 25). The Mowry shale is exposed on the
surface at an elevation of about 5,700 feet.
Outcrops of the Frontier formation on the
north flank of the structure dip 10 to 200,
and those on the south dip about 60. The
structure has about 1,100 feet of closure
opening on the southwest into the Lake Creek
Oil in commercial quantities was discovered
on this structure in 1922 from a' well in the
SW1/sNW1/4 sec. 36. This well produced 300
barrels of 24 API gravity black oil daily
from the Tensleep sandstone at 3,176 to 3,245
feet. Fourteen other wells were completed, of
which 3 were in the Embar limestone, 10 in
the Tensleep sandstone, and 1 in the Madison
limestone. The initial daily production of the
wells ranged from 200 to 300 barrels. The
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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/m1/55/: accessed January 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.