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Dallas-based Cheyenne River LLC (Cheyenne River), a company who has an active horizontal Lower Cretaceous program along the east–central portion of the Powder River Basin, plans additional work in northwestern Niobrara County, Wyoming. Spotting near the confluence Niobrara, Weston, and Converse counties, Cheyenne River has received state approval to drill a lateral Lower Cretaceous test on the southern flank of Snyder Creek Field, an oil pool that produces from both the vertical and lateral section of the Muddy.
Cheyenne River has staked the Jasper #29-6H, ne-ne 32-40n-66w, a projected 17,435’ (TMD) horizontal Muddy effort that will have a bottom-hole location terminating to the northwest in the se-se 19-40n-66w. True vertical depth for this prospect is permitted to reach 8,268’.
This test will be the exploratory well for the newly formed Wagonhound Federal Unit, an entity that comprises 24,785.46 acres within 39n–40n, 65w–67w.
According to sources, Cheyenne River is exploring for horizontal Muddy potential apart from the major channel sands that produce at Clareton, Sherwin, and Frog Creek Fields, which are part of the Clareton Trend. The Jasper #29-6H will be Cheyenne River’s fourth lateral Muddy well in this locale and will be targeting the stratigraphically thicker portion of the Muddy reservoir outside the main channel body by using an extended-reach lateral.
Early in 2016, Cheyenne River announced plans to exploit this and the surrounding sections by drilling up to a dozen unconventional Muddy wellbores. The three pad sites for these lateral attempts were in the ne-sw 32-40n-66w, the sw-ne 29-40n-66w, and the se-ne 29-40n-66w. None of the prospects were drilled, and all 12 permits were allowed to expire during the first quarter of 2016.
The Texas independent’s latest staking spots a little more than a mile northeast from a dry hole punched in 61 years ago by Delta Drilling at the Delta-Williston-Gov #1-A, ne-ne 6-39n-66w. This vertical wildcat bottomed in the Dakota at a depth of 8,584’ and was abandoned in 1954 with no drillstem tests conducted. Tops picked in this failure include Niobrara at 7,065’, Frontier at 7,346’, Mowry at 8,210’, Newcastle at 8,382’, and the Dakota at 8,554’, beneath a KB elevation of 4,526’.
Approximately 1.5 miles northwest of the Jasper #29-6H, MKM Oil drilled a straight-hole Lower Cretaceous wildcat at the Apache-Government #1, ne-se 3-40n-66w. This 8,542’ Lakota test was abandoned in 1961 with no tests or significant shows reported. Log top of the Muddy was picked at 8,260’ (TVD) below a KB elevation of 4,508’.
The nearest established production to Cheyenne River’s staking sits some 2 miles to the southeast at a company-operated developmental well within Dogie Field. Producing from the commingled Muddy/ Mowry, the Lone Crow Unit #4-1, se-se 4-39n-66w, was completed for an IPP of 15 bopd, 30 mcfgpd, and 196 mcfgpd from perforations at 8,094’–8,262’. First going on-line in February 2009, this vertical venture has cumulated more than 9.3 k bo, 92.5 mmcfg, and 783 bw.
Dogie Field is a stratigraphic-type reservoir that has output surpassing 46.5 k bo and 343 mmcfg.
The closest horizontal production to the Jasper #29-6H is found approximately 3 miles to the southeast. Also operated by Cheyenne River, the Cassidy #9-8H, se-se 9-39n-66w, is a well within Snyder Creek Field that was completed for an IPP of 238 bopd, 238 mcfgpd, and 453 bwpd. Going on-stream in February 2014, this well has cumulated more than 65.4 k bo, 301 mmcfg, and 61 k bw from the Muddy interval at 8,815’–13,603’. Bottom-hole location for this wellbore landed in the se-sw 15-39n-66w.
Snyder Creek Field is a stratigraphic trap that has yields exceeding 329 k bo and 531 mmcfg from the vertical and horizontal sections of the Muddy/Newcastle at depths approaching 7,900’. This reservoir was discovered in 1954.
Cheyenne River’s exploration and production activity is located in an area commonly known as the Clareton Trend, Wyoming’s longest oil pool (from a geographical standpoint). This trend is a combination of numerous fields that extend some 42 miles long and between 1 and 8 miles wide. Fields that produce from the Muddy in this trend include Clareton, Hampshire, Black Thunder, Wagonhammer, Cheyenne River, Sherwin, Skull Creek, North Skull Creek, Mush Creek, Snyder Creek, Frog Creek and Dogie Creek.
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