Oklahoma-based Devon Energy (Devon) has received approval from the state to drill a horizontal Phosphoria wildcat some 5 miles northeast of the community of Worland in the southeastern portion of Wyoming’s Big Horn Basin. The company has surveyed in location for the Worland Unit #120-032H, sw-se 32-48n-92w, Washakie County, a proposed 10,760’ (TVD) Phosphoria test situated along the northwestern flank of Rattlesnake Field. Bottom-hole location is expected to land one township to the south in the ne-sw 4-47n-92w.
Rattlesnake Field is a stratigraphic-type trap that produces from the Embar/Phosphoria and following its discovery in 1968 has cumulated more than 7.2 mmbo and 6.7 bcfg. The nearest exploration to the proposed Worland Unit #120-032H is less than a quarter-mile to the northeast at a dry hole drilled in 1949 by Sharples Oil (Sharples). Later assigned to Devon, the Holly Sugar Unit #25E, ne-se 32-46n-92w, bottomed in the vertical Tensleep at a depth of 10,865’. Sharples tested the Embar in this well from open-hole perforations at 10,406’–10,523’, giving it an IPF of 20 bopd. Never producing commercially, the Holly Sugar Unit #25E was temporarily abandoned for more than 56 years before its official plugging in 2006. The Embar top in the failure was picked at 10,405’ beneath a ground elevation of 4,018’.
The closest established production to the Worland Unit #120-032H is a similar distance to the southeast at a developmental test originally drilled by California Oil Company and now operated by Devon. The Worland Unit #54E-A5, ne-ne 5-47n-92w, tapped the Phosphoria at a depth of 10,788’. This field well was given an IPP of 154 bopd, 54 mcfgpd, and 44 bwpd from vertical perforations at 10,546’–10,646’.
First going on-line in June of 1985, the Worland Unit #54E-A5 has yielded more than 82.6 k bo, 87.1 mmcfg, and 28.4 k bw; however, latest gauge showed that during May of 2015, the prospect produced just 92 bo, 190 mcfg, and 29 bw. Log tops for the Worland Unit #54E-A5 include the Frontier at 7,572’, Morrison at 9,066’, Crow Mountain at 9,728’, Dinwoody at 10,486’, and the Phosphoria came in at 10,534’ beneath a KB elevation of 4,055’.
Located almost a mile northeast of Devon’s pending staking is Worland Field, a doubly plunging, closed, asymmetrical anticline. This northwest/southeast–trending feature is roughly 25 miles long. Discovered in June of 1945 by Pure Oil, the reservoir is now operated by Devon and has cumulated more than 19.8 mmbo and 461 bcfg. Worland Field currently produces from the Embar, Muddy, and Tensleep.
Devon, who is also the operator for Rattlesnake Field, is planning to exploit both of these pools for horizontal potential. The company intends to drill a series of lateral Phosphoria tests that include the following:
• the Worland Unit #121-N17H, se-sw 17-48n-92w (BHL in the nw-ne 18-48n-92w);
• the Worland Unit #122-N17H, se-sw 17-48n-92w (BHL in the ne-se 20-48n-92w);
• the Worland Unit #124-K18H, ne-sw 18-48n-92w (BHL in the sw-nw 20-48n-92w);
• the Worland Unit #123-K18H, ne-sw 18-48n-92w (BHL in the nw-se 12-48n-92w); and
• the Worland Unit #125-A3H, ne-ne 3-47n-92w (BHL in the nw-nw 34-48n-92w).
No activity has been reported at any of these anticipated well sites.
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