BELIZE

US CAPITAL ENERGY BELIZE LIMITED

BOLIVIA

YPFB CHACO S.A.

COLOMBIA

ALANGE ENERGY CORP. SUCURSAL COLOMBIA

ALKHORAYEF PETROLEUM COLOMBIA

AMERISUR EXPLORACION COLOMBIA LTDA

ARGOSY ENERGY INTERNATIONAL

ASESORIA EN INGENIERIA DE PETROLEOS S.A.S.

AVANTE COLOMBIA INC

BAKER HUGHES DE COLOMBIA

BD PRODUCTION CO., INC SUCURSAL COLOMBIA

BETA ENERGY CORP.

BORETS INTERNATIONAL LTD SUCURSAL COLOMBIA

BRINSA S.A.

C&C ENERGIA LLANOS LTD SUC. COLOMBIA

CANACOL ENERGY COLOMBIA S.A.

CEPCOLSA

CHEVRON PETROLEUM COMPANY

CNE OIL & GAS S.A.S.

COLOMBIA ENERGY DEVELOPMENT CO

COLOMBUS ENERGY SUCURSAL COLOMBIA

COLREGISTROS SAS

COMTROL COLOMBIA S.A.

CONEQUIPOS ING. LTDA.

CONSORCIO COLOMBIA ENERGY

CONSORCIO TPIC-MULTISERVICIOS

CONSORCIO VETRA SUROCO

COOP COMPAÑIA OPERADORA PETROCOLOMBIA S.A.

DIACO S.A.

DISCOVERY ENERGY SERVICES COLOMBIA S.A.

DOVER INTERNATIONAL OPERATIONS INC.

DRILLING AND WORKOVER SERVICES LTDA

DRUMMOND LTD

DUROMETAL CIA LTDA

ECOPETROL S.A

EFFLOGISTICS SAS

EL TRIUNFO UNION TEMPORAL

EMERALD ENERGY PLC - SUCURSAL COLOMBIA

EMPRESAS PUBLICAS DE MEDELLIN E.S.P.

EQUION ENERGIA LIMITED

EQUIPAMENTOS INDUSTRIALES LTDA

ERAZO VALENCIA S A

ESTRELLA INTERNATIONAL ENERGY SERVICES SUCURSAL COLOMBIA

ESTRELLA PETROLERA DE COLOMBIA SAS

FENIX OIL & GAS S.A.

FMC TECHNOLOGIES, INC.

GAP LOGISTIC E.U.

GE OIL & GAS ESP COLOMBIA SAS

GEO TECHNOLOGY LA SUCURSAL COLOMBIA

GEOFISICA SISTEMAS Y SOLUCIONES S.A.

GEOPARK COLOMBIA S.A.S.

GEOPRODUCTION OIL AND GAS COMPANY OF COLOMBIA

GEOTEC COLOMBIA S.A.S

GPC DRILLING S.A.

GRAN TIERRA ENERGY COLOMBIA LTD.

GRUPO C&C ENERGIA (BARBADOS) SUCURSAL COLOMBIA

GWDC COLOMBIA SAS

HALL LATIN AMERICA SRL

HARKEN DE COLOMBIA LTD.

HIGH QUALITY ENGINEERING

HILONG OIL SERVICE SUCURSAL COLOMBIA

HOCOL S.A.

HUPECOL CARACARA,  LLC

HUPECOL OPERATING CO LLC

HYDROCARBON SERVICES S.A.S

IMPORPETROL LTDA.

INDEPENDENCE DRILLING S.A.

INTEGRAL DE SERVICIOS TECNICOS

IRI DE COLOMBIA LTDA

ISLEMA RESOURCES CORP.

KAPPA RESOURCES COLOMBIA LTD.

LAGOSUR PETROLEUM COLOMBIA INC SUCURSAL COLOMBIA

LATCO DRILLING S.A.

LEWIS ENERGY COLOMBIA, INC

LUKOIL OVERSEAS COLOMBIA LTD.

LUPATECH OFS S.A.S.

MANSAROVAR ENERGY COLOMBIA LTD.

MAUREL & PROM COLOMBIA B . V

MBS INGENIERIA S.A.S.

MECANICOS ASOCIADOS S.A.S

MEGAFER LTDA.

META PETROLEUM CORP SUCURSAL COLOMBIA

MOMPOS OIL COMPANY INC

MONTECZ S.A.

MORELCO S.A.S.

NABORS DRILLING INTERNATIONAL LIMITED

NEUMATICA DEL CARIBE S.A.

NEW GRANADA ENERGY CORPORATION SUCURSAL COLOMBIANA

NEW LIFT SOLUTIONS BV SUCURSAL COLOMBIA

NEXEN PETROLEUM COLOMBIA LIMITED

NIKOIL ENERGY CORP. SUC COLOMBIA

NORTH OIL SERVICES S.A.C.

OCCIDENTAL ANDINA, LLC

OCCIDENTAL DE COLOMBIA, INC.

OILFIELD TOOLS SUPPLY SAS

OMEGA ENERGY COLOMBIA

OMIMEX DE COLOMBIA LTD.

PACIFIC STRATUS ENERGY COLOMBIA CORP

PAREX ENERGY COLOMBIA LTD

PAREX RESOURCES COLOMBIA LTD SUCURSAL

PAREX VERANO LIMITED SUCURSAL

PARKER DRILLING COMPANY INTERNATIONAL LIMITED

PERENCO OIL & GAS COLOMBIA LTD.

PETRO ANDINA COLOMBIA LTD. SUCURSAL

PETROAMERICA COLOMBIA

PETROBRAS COLOMBIA LIMITED

PETRODORADO SOUTH AMERICA S.A. SUCURSAL COLOMBIA

PETROLEOS COLOMBIANOS S.A.

PETROLEOS DEL MAR

PETROLEOS DEL NORTE S.A

PETROLEOS SUD AMERICANOS SUCURSAL COLOMBIA

PETROLERA MONTERRICO

PETROLEUM EXPLORATION INTERNATIONAL S.A. SUCURSAL COLOMBIA

PETROLIFERA PETROLEUM (COLOMBIA) LIMITED

PETROMINERALES COLOMBIA CORP. SUCURSAL COLOMBIA

PETROMINERALES COLOMBIA LTD

PETRONOVA COLOMBIA

PETROPULI LTDA.

PETROSANTANDER (COLOMBIA) INC.

PETROTESTING DRILLING S.A.

PETROTIGER SERVICES COLOMBIA LTDA.

PETROWORKS S.A.S

PIONEER DE COLOMBIA SDAD LTDA.

PLATINO ENERGIA BARBADOS CORP SUCURSAL COLOMBIA

PLUSPETROL COLOMBIA CORPORATION SUCURSAL COLOMBIA

POINTER INSTRUMENT SERVICES LTDA

PRIDE COLOMBIA SERVICES

SAN ANTONIO INTERNACIONAL SUCURSAL COLOMBIA

SANTA MARIA PETROLEUM INC SUCURSAL COLOMBIA

SAR ENERGY S.A.

SAXON SERVICES DE PANAMÁ S.A. SUC. COLOMBIA

SAXON SERVICES DEL PERU S.A.

SCHLUMBERGER SURENCO S A

SERVICIOS INDUSTRIALES Y METALMECANICOS TABARES S.A.S.

SK INNOVATION CO., LTD.

SOGOMI  ENERGY S.A.

SOLANA PETROLEUM EXPLORATION COLOMBIA LIMITED

SOPORTE MINERO TECNICO S.A

STAR OILFIELD SERVICES LTDA

TABASCO OIL COMPANY LLC

TALISMAN COLOMBIA OIL & GAS LTD

TDA SUPPLY & SERVICE S.A.

TECPECOL BLOQUE -06

TECPETROL COLOMBIA SAS

THORNELOE ENERGY SUCURSAL COLOMBIA

THX ENERGY SUCURSAL COLOMBIA

TOP DRILLING COMPANY SUCURSAL COLOMBIA

TRAYECTORIA OIL & GAS SUCURSAL COLOMBIA

TURKISH PETROLEUM INTERNATIONAL COMPANY LIMITED SUCURSAL COLOMB

TWM TOTAL WASTE MANAGEMENT S.A.

UNION TEMPORAL ANDINA

UNION TEMPORAL II&B

UNION TEMPORAL MIDAS

UNION TEMPORAL MORICHE

UNION TEMPORAL OMEGA ENERGY

UNION TEMPORAL PETROCARIBE

UNIVERSIDAD INSDUSTRIAL DE SANTANDER

VARISUR SAS

VERANO ENERGY DELTA CORP. SUCURSAL COLOMBIA

VETRA EXPLORACIÓN Y PRODUCCIÓN COLOMBIA S.A.S

WEATHERFORD COLOMBIA LIMITED

WELL LOGGING S.A.

WINCHESTER OIL AND GAS S.A.

CUBA

EMPRESA IMPORTADORA DE ABASTECIMIENTO PARA EL PETROLEO, ABAPET

CUPET

ECUADOR

CONSORCIO PETROLERO PALANDA YUCA SUR

CONSORCIO PETROSUD - PETRORIVA

P.E.C.E.

PETROAMAZONAS ECUADOR S.A.

PETROBELL INC. - GRANTMINING S.A.

SCHLUMBERGER DEL ECUADOR S.A.

TECPECUADOR S.A.

City Oriente

CNPC

Consorcio B7 - B21

CPEB

Dygoil

Encana

Petrobell

Petroecuador

Petrobras Ecuador

Repsol

Sertecpet

Sinopec

GUATEMALA

COMPAÑIA PETROLERA DEL ATLANTICO CPA

PERENCO GUATEMALA LIMITED

MEXICO

BAKER HUGHES DE MEXICO S. DE R.L. DE C.V.

DOWELL SCHLUMBERGER DE MEXICO, S.A. DE C.V.

OPTIMUS SISTEMAS HOLISTICOS S.A. DE C.V.

PROVEEDORA ESPECIALIZADA EDGA S DE RL DE CV

WEATHERFORD

PARAGUAY

AMERISUR SA

PRESIDENT ENERGY PARAGUAY S.A. (PREPASA)

PERU

CEPSA PERU S.A., SUCURSAL DEL PERU

CIA. PETROLERA RIO BRAVO S.A.

CNPC PERU S.A.

GOLD OIL PERU S.A.C.

MERCANTILE PERÚ OIL & GAS SA

PETRO-TECH PERUANA S.A.

SAVIA PERU S.A.

SCHLUMBERGER DEL PERU S.A.

Graña Montero

I.T.S.

North Oil Srvices

Olympic Perú Inc.

Petrolera Monterico

Petrolifera

Petrotech Peruana

SIRIA

HBS International Syria Ltd.

Dublín Internacional

VENEZUELA

MABCA 2001 C.A.

WWIS GLOBAL SUPPLY

CNPC

Harvest Vinccler

Hocol

PDVSA (Maraven)

Perenco Venezuela

Petrobras Energía

Preussag

Tecpetrol

Teikoku

CONGO

PERENCO

CHILE

ENAP