BRITISH PETROLEUM
ROSNEFT OIL COMPANY
SHELL OIL COMPANY
GAZPROM NEFT OIL COMPANY
«SALYM PETROLEUM DEVELOPMENT N.V.»
OJSC «RITEK»
LLC «GAZPROM DOBYCHA ORENBURG»
JSC «MANGISTAUMUNAJ GAZ»
BRITISH PETROLEUM
ROSNEFT OIL COMPANY
SHELL OIL COMPANY
GAZPROM NEFT OIL COMPANY
«SALYM PETROLEUM DEVELOPMENT N.V.»
OJSC «RITEK»
LLC «GAZPROM DOBYCHA ORENBURG»
JSC «MANGISTAUMUNAJ GAZ»