Just tidied this up as spacing was all out of kilt8 Feb 2024 15:50
The Andrews-1 well Is targeting the The Hunton Limestone formation which lies within the STACK play in central Oklahoma, as well as
beyond the defined boundary in north-central and northwest Oklahoma.
Structurally, the productive formation lies along the border of the Anadarko basin to the southwest and the Anadarko shelf to the northeast.
The Hunton Limestone does not contain primarily conventional porosity as viewed through electric logs from thousands of historic vertical wells. However, this carbonate reservoir, sourced from
the overlying Devonian Woodford shale, internally provides multiple characteristics of secondary porosity, such as: diagenesis, karsting, vugular porosity, dolomite, and regional fracturing.
From 70+ horizontal wells drilled in central Oklahoma, image log analysis has determined that the entire Hunton interval contains a large network of partial and open fractures that span across the region. These
fractures are the primary feature that provides the pooling of hydrocarbons within the reservoir.
The Hunton formation is both truncated structurally by the Anadarko shelf and stratigraphically by pinching out to the northeast by the underlying Sylvan Shale. The Hunton formation can be sub-divided into three different producing formation: Upper Hunton (Frisco and Bois d’arc limestones), Middle Hunton, and Lower Hunton (Chimney Hill formation composed of the Clarita and Cochrane limestones).
As a carbonate formation with unconventional porosity, the completion process must also be viewed unconventionally. The fracture network within the formation must be exploited to obtain a long term producing and naturally flowing horizontal well. With a higher than average recovery efficiencies for STACK horizontal wells, EUR’s for the Hunton Limestone intervals range from 125k BO to 385k BO and 2.5 BCFG to 3.5 BCFG. The secondary porosity inherent within the formation, the regional fracture
network, and custom fracturing design, ultimately provides evidence for a large and economically viable hydrocarbon reservoir within the STACK play of central Oklahoma.
It would seem our first well has every chance of coming in with the estimated 75% chance of success, with a 45% share of the production we could be looking at 60+ bopd to Union Jack. Not to be sniffed at if it comes in.
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