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Repsol makes the largest US onshore oil discovery in 30 years

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Oilfield Technology,


  • The contingent resources currently identified in the Nanushuk play in Alaska amount to approximately 1.2 billion bbls of recoverable light oil.
  • The Horseshoe wells extend by 20 miles (32 km) a play already uncovered in previous campaigns in an area known as Pikka.
  • Preliminary development concepts for Pikka anticipate first production there from 2021, with a potential rate approaching 120 000 bpd.
  • The Horseshoe-1 and Horseshoe-1A wells drilled in the 2016 - 2017 winter campaign confirm Nanushuk as a significant emerging play in Alaska’s North Slope.

Repsol and partner Armstrong Energy have made in Alaska the largest US onshore conventional hydrocarbons discovery in 30 years. The Horseshoe-1 and 1A wells drilled during the 2016-2017 winter campaign confirm the Nanushuk play as a significant emerging play in Alaska’s North Slope.

 

The contingent resources identified with the existing data in Repsol and Armstrong Energy’s blocks in the Nanushuk play in Alaska could amount to approximately 1.2 billion bls of recoverable light oil.

Repsol has been actively exploring Alaska since 2008, and since 2011 the company has drilled multiple consecutive discoveries on the North Slope along with partner Armstrong.

The successive campaigns in the area have added significant new potential to what was previously viewed as a mature basin. Additionally Alaska has significant infrastructure which allows new resources to be developed more efficiently.

Repsol holds a 25% working interest in the Horseshoe discovery and a 49% working interest in the Pikka Unit. Armstrong holds the remaining working interest and is currently the operator.

Prior to drilling Horseshoe, Repsol as operator drilled 13 exploration and appraisal wells on the North Slope, which led to multiple reservoir discoveries currently included in the Pikka Unit.

The Horseshoe discovery extends the Nanushuk play more than 20 miles south of the existing discoveries achieved by Repsol and Armstrong in the same interval within the Pikka Unit during 2014 and 2015, where permitting for development activities are underway. A significant percentage of the above noted resources are expected to be reclassified as proven and probable reserves upon sanctioning of the Nanushuk Development Project.

Preliminary development concepts for Pikka anticipate first production there from 2021, with a potential rate approaching 120 000 bpd.

The Horseshoe-1 discovery well was drilled to a total depth of 6000 ft (1828 m) and encountered more than 150 ft of net oil pay in several reservoir zones in the Nanushuk section. The Horseshoe-1A sidetrack was drilled to a total depth of 8215 ft. and encountered more than 100 ft. of net oil pay in the Nanushuk interval as well.

Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/10032017/repsol-makes-the-largest-us-onshore-oil-discovery-in-30-years/


 

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