Under River is a producing heavy oil field located onshore Colombia and is operated by Mansarovar Energy Colombia. The field is located in block Nare.

Field participation details

The field is owned by Ecopetrol, Oil and Natural Gas and China Petrochemical.

Production from Under River

The Under River heavy oil field recovered 78.78% of its total recoverable reserves, with peak production in 2014. The peak production was approximately 3.83 thousand bpd of crude oil and condensate. Based on economic assumptions, production will continue until the field reaches its economic limit in 2036.

Remaining recoverable reserves

The field is expected to recover 3.04 Mmboe, comprised of 3.04 Mmbbl of crude oil & condensate. Under River heavy oil field reserves accounts 0.01% of total remaining reserves of producing heavy oil fields globally.

About Mansarovar Energy Colombia

Mansarovar Energy Colombia Ltd (Mansarovar Energy) is an oil and gas company that offers exploration and production services. The company’s services include drilling and well support, procurement, contract support and transportation of hydrocarbons services with emphasis on heavy crude oil. It develops activities of exploration, exploitation, transportation and commercialization of hydrocarbons in the departments of Boyaca, Santander, Antioquia, Meta and Cundinamarca. The company tests the following technologies including injection of foams or surfactants, injection of cementing gel, simultaneous nitrogen injection with steam, pulse tubing and continuous vapor injection, among others. Mansarovar Energy is headquartered in Bogota, Colombia.


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.