Kuparuk River Unit (West Sak) is a producing heavy oil field located onshore the US and is operated by ConocoPhillips Alaska. The field is located in block ADL 25661, ADL 25636, ADL 25651, ADL 25662, ADL 25639, ADL 25660, ADL 25650, ADL 28242, ADL 25648, ADL 25649, ADL 25637, ADL 25663, ADL 25638, ADL 28243, ADL 380058, ADL 385172, and ADL 28248.

Field participation details

The field is owned by Exxon Mobil, Chevron and ConocoPhillips.

Production from Kuparuk River Unit (West Sak)

The Kuparuk River Unit (West Sak) heavy oil field recovered 30.01% of its total recoverable reserves, with peak production in 2018. The peak production was approximately 22.67 thousand bpd of crude oil and condensate. Based on economic assumptions, production will continue until the field reaches its economic limit in 2096.

Remaining recoverable reserves

The field is expected to recover 173.89 Mmboe, comprised of 173.89 Mmbbl of crude oil & condensate. Kuparuk River Unit (West Sak) heavy oil field reserves accounts 0.38% of total remaining reserves of producing heavy oil fields globally.


Information on the field is sourced from GlobalData’s fields database that provides detailed information on all producing, announced and planned oil and gas fields globally. Not all companies mentioned in the article may be currently existing due to their merger or acquisition or business closure.