Petroleum and Natural Gas Fields in Wyoming Page: 32
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PETROLEUM AND NATURAL GAS FIELDS IN WYOMING
1957. Wells in the Wall Creek sands produced
some gas along with the oil. The daily pro-
duction of gas in 1918 and 1919 exceeded 4
million cubic feet but decreased with the oil
production to about 80,000 cubic feet in 1951.
By 1953 the gas production was too small to
In 1935 a deep test was drilled on top of the
structure, in which the following sands and
formations were logged: Shannon sand, 945
to 993 feet; Wall Creek sands, 3,011 to 3,130
feet; Muddy sand, 4,210 to 4,215 feet; Dakota
sand, 4,276 to 4,281 feet; Lakota sand, 4,362
to 4,406 feet; Sundance formation, 4,570 to
4,910 feet (the first sand member was dry, the
second carried water, and the third--45 feet
thick--carried water); Chugwater formation,
4,940 to 5,704 feet; Embar lime, 5,705 to 5,933
feet; Tensleep sandstone, 5,933 to 6,247 feet
(dry); Amsden formation, 6,247 to 6,553 feet;
and Madison limestone (porous and crystal-
line), 6,553 feet.
On December 15, 1957, the 142 wells in the
field produced at the rate of about 1,498 bar-
rels of oil and an estimated 19,000 barrels of
water daily. Of these wells, 13 produced about
28 barrels of 340 API gravity green oil from
the Shannon sand, and 69 produced about 675
barrels of 350 API gravity green oil from the
Wall Creek sands; 4 were producing 37 bar-
rels of oil daily from the so-called "stray sand"
(between the Shannon and Wall Creek sands) ;
48 in the Dakota sand were producing 224
barrels a day; and 8 in the Lakota sand were
producing 534 barrels of oil and 13,000 barrels
of water daily.
Virtually all development in the field since
1938 has been in the Dakota and Lakota sands.
From 1942 through 1947 about 55 wells were
drilled as Dakota-Lakota tests. The Lakota
sand carried more water than oil, so most of
the wells were completed, or soon recom-
pleted, in the Dakota sand. A gas-injection
program was started in the Second Wall Creek
sand during 1935. The injection well took
80,000 cubic feet of gas at a line pressure of
300 p.s.i. This program was soon abandoned
owing to the apparent gas channeling to offset
producing wells and the high purchase price
of the gas. After considerable study, a water-
injection experiment was started in March
1953. Three wells in the Second Wall Creek
sand, in the N1/2 sec. 8, were used as injection
wells. The initial daily injection rate was
about 5,500 barrels, at a pressure of 10 p.s.i.
The water is obtained from two Lakota-sand
oil wells. This pilot injection test proved suc-
cessful, and the injection program (fig. 18)
is being expanded to the entire Second Wall
Creek reservoir. In February 1958 there were
38 injection wells. Water injected to Febru-
ary 1958 amounted to 5,705,448 barrels.
Analyses of oil from the Shannon, "stray
sand," Second Wall Creek (Frontier), Dakota,
and Lakota formations are given on pages 335
to 337. Analyses of gas from the Shannon,
Wall Creek, and Dakota and water from the
Shannon, Wall Creek, Lakota, and Sundance
are given in tables 8 and 9 (pp. 287 and 293, re-
The total oil and gas production from the
Big Muddy field to the first of 1957 was 37,-
574,833 barrels and 549 million cubic feet.
During 1956, 1,141,316 barrels of oil was pro-
duced from the field. The oil can be pumped
through a line to Glenrock, 5 miles northeast
of the field, or through a line to the refineries
The Big Piney gasfield (fig. 19) is in Tps.
28, 29, and 30 N., R. 113 W., Sublette County.
This field includes the North Big Piney, South
Big Piney, Dry Piney, and Paff-Quealy fields
and part of the original Tip Top shallow unit.
Generally speaking, the subsurface structure
is that of an eastward-dipping monocline, in-
clined at between 50 and 8, with prominent
flattening due, no doubt, to differential com-
paction in the areas where the gas-sand bodies
are thickest and best developed. Surface rocks
in the field belong to the Green River and
Knight formations. Elevations of wells in the
field range from 7,000 to 7,900 feet above sea
The discovery well in the NE1/4NE1/ sec.
10, T. 29 N., R. 113 W., "blew in" in midwin-
ter 1938 for an estimated open flow of 22 to
75 million cubic feet of gas a day. Water from
sands above the gas zone was blown to the
surface and formed a giant icicle encasing
the entire derrick during the subzero weather.
The well had been standing idle for 3 weeks,
at a total depth of 1,695 feet, when the blow-
out occurred. Later investigation proved that
the Almy gas sands were about 1,000 feet in
depth and had been mudded off during drill-
ing without the operator suspecting their pres-
ence. From 1938 to 1952 a few wells were
drilled in the area, largely in search of oil.
On September 9, 1952, a well in sec. 28, T. 28
N., R. 113 W., blew out from a depth of 984
feet. This well had been drilled through Almy
gas sands from 647 to 747 feet and produced
at the rate of 75 million cubic feet a day for
10 days before the well could be killed, cased,
and cemented. Soon afterward development
of the area as a gasfield was begun.
Gas is generally found in four main sand
zones. However, in the Belco B-2 well (SW1/4
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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/m1/46/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.