Petroleum and Natural Gas Fields in Wyoming Page: 37
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REVIEW OF OIL AND GAS FIELDS
water daily. During 1956 the four gas wells
averaged 770,000 cubic feet daily. Analyses of
oil from the Tensleep, gas from the Frontier,
and water from the Tensleep formations are
given on page 338 and in tables 8 and 9 (pp.
287 and 293, respectively).
Total production through 1956 amounted to
7.63 billion cubic feet of gas and 564,987
barrels of oil. The gas goes into a utility line
serving Frannie and Deaver. The oil enters
the pipeline from Garland to Elk Basin.
BIG SAND DRAW AND SOUTH SAND
Big Sand Draw field (fig.. 21) is in the east
half of T. 32 N., R. 95 W., Fremont County.
The structure is a long, narrow anticline
trending northwest-southeast. Flat-lying beds
of the Wind River formation conceal surface
indications of the structure. Information ob-
tained from well logs indicates that the struc-
ture is highly faulted, with the faults trend-
ing with the axis. These faults seem to in-
crease in intensity with depth. Subsurface
closure of the Tensleep formation is at least
2,500 feet. The Mesaverde :formation, exposed
north of the field in a curved outcrop, indi-
cated a structure and led to discovery of the
field. Elevations in the field range from 5,900
to 6,200 feet, while the "Beaver Rim," a White
River Tertiary escarpment at the south end
of the field, rises about 1,000 feet above the
The field was discovered in February 1918
on completion of a well in the NE1/SW1/4
sec. 10, in the First Frontier sand, at 2,427 to
2,485 feet. The estimated daily open-flow vol-
ume was 40 million cubic feet of gas. Initial
shut-in wellhead pressure was 1,350 p.s.i. As
more wells were drilled in the field, a total
of five sands in the Frontier formation was
found to be gas productive.
The interval between the Thermopolis shale
and the Morrison formation at Big Sand Draw
is referred to as the Cloverly in some reports
and as the Lakota in others. A well in the
SW1/4NW1/SW1/i sec. 4 was drilled to the
base of the Sundance formation and contained
water. The well was completed in the Clover-
ly formation and mudded in without testing.
In October 1937 the well was reconditioned
and produced at the rate of 54 million cubic
feet of gas a day. Initial shut-in pressure was
about 2,000 p.s.i.
Gas was discovered in a sand in the Mor-
rison formation in a well in the SWNEA
NE1/4 sec. 15 in December 1939. Initial daily
production was 9.5 million cubic feet of gas
from 4,284 to 4,297 feet.
A gas well in the SW1/4SE1ISEl sec. 26
(in the South Sand Draw gas area) was com-
pleted in the Muddy sand in January 1956.
Initial production was 1.99 million cubic feet
a day from the interval of 5,920 to 5,934 feet.
The South Sand Draw gas area is essen-
tially the productive area in sec. 26. It joins
the Big Sand Draw field and, for this report,
is considered an extension of the Big Sand
Oil was discovered at Big Sand Draw in
December 1944, when a well in the NW
NW1/ sec. 14 was completed in the Tensleep
sandstone. Initial daily flowing production
was 1,100 barrels of 350 API gravity oil from
7,285 to 7,436 feet. Core analyses of the Ten-
sleep show high porosity and permeability at
Big Sand Draw. The gas-oil ratio of the Ten-
sleep oil is very low, and an active natural
water drive is present.
The Phosphoria (some early reports call
this Embar) formation was proved produc-
tive in December 1948. The first well, in the
NE1/4NE14 sec. 15, had an initial daily flow-
ing production of 2.97 million cubic feet of gas
and 197 barrels of 55.4 API gravity con-
densate. The producing interval was 6,850
to 7,000 feet. This gas contains 2 percent
hydrogen sulfide by volume. To make the gas
salable a treating plant was built in the field
to remove the hydrogen sulfide from the gas.
The original capacity of the plant was 15 mil-
lion cubic feet of gas a day at 400 p.s.i.
The electric log of well No. 9, in the SW1/4
SW1/4NW1/4 sec. 14, shows the depth, in feet,
to the top of formations as follows: First
Frontier, 2,800; Mowry, 3,460; Muddy, 4,054;
Cloverly, 4,234; Lakota, 4,352; Morrison,
4,378; Sundance, 4,610; Gypsum Spring,
4,865; Nugget, 4,900; Chugwater, 5,240; Din-
woody, 7,000; Phosphoria, 7,095; Tensleep,
7,460; Amsden, 7,982; Darwin (sand ?), 8,050;
and Madison, 8,085. Tests of the Madison for-
mation taken in well No. 9 and a well in the
NW1/NW1/NWSE1/4 sec. 10 yielded water.
Analyses of oil from the Phosphoria and
Tensleep formations are given on pages 338
and 339. Analyses of gas from the Frontier,
Lakota (Cloverly), Morrison, and Phosphoria
formations are given in table 8 (p. 287). Anal-
yses of water from the Frontier, Morrison, and
Madison are given in table 9 (p. 293).
The well status on January 1, 1958, at Big
Sand Draw was as follows: 10 gas wells, 4
gas-condensate wells, and 13 oil wells. By for-
mations, the wells were as follows: Frontier,
7 gas; Muddy, 1 gas; Lakota, 1 gas Morrison,
1 gas; Phosphoria, 4 gas-condensate; and Ten-
sleep, 13 oil. Average daily production on
December 10, 1957, was as follows: Frontier,
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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/m1/51/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.