Addax Petroleum

Nigeria

British Petroleum

Colombia

Chevron

Nigeria

Ecopetrol

Colombia

GranTierra Energy

South America (Colombia & Peru)

Petronas

Malaysia

Saudi Aramco

Saudi Arabia

Shell

Nigeria

Energy Development Co.

Colombia

Nacional de Hidrocarburos

Colombia

National Petroleum Corporation

Nigeria

Schlumberger

Ecuador

Pemex

Mexico

Hocol

Colombia

Agip

Nigeria

Consorcio Shushufindi

Ecuador

Total

Nigeria

Emerald Energy

Colombia

Mobil

Nigeria

PetroEcuador

Ecuador

Pan Ocean

Nigeria