Electronic logs confirmed the primary unconventional objectives – the Caney and Woodford shales – showed gross thicknesses of 163ft and 43ft respectively. There were also gas shows of more than 1500 units in the two bodies, according to Tomahawk.

Gas was also found in seven conventional formations where the well intersected thicknesses grossing 83ft.

In April, the company said drilling at the 11th well found 60ft of gross hydrocarbons and multiple formations. The shales were intersected at 174ft and 45ft.

Two other wells – Snell-Heirs 2-17 and Snell-Heirs 5-18 – have also been completed and could be producing within a month as part of the company’s strategy of fast-tracking production, according to Tomahawk.

Results from these wells have not yet been released, but the company said it expects Snell-Heirs 2-17 and 5-18 would enable immediate production from conventional formations as they had been offset about 30m from the initial discovery.

Offsetting these wells would allow the original bore to be developed to reach deeper, non-conventional reservoirs that might require fraccing.

Tomahawk has now spudded well number 15 at the project.

"The 15th well in the Oklahoma drilling program, the Hudson 1-16, has been spudded and is expected to reach its proposed total depth of approximately 4,000 feet within the next 12 to 14 days," the company said.

"Although all other wells are named Snell Heirs or Longview and this is Hudson they are all in the same vicinity as the names refer to the lease owner not location."