Since TDC was founded, TDC &  HALLIBURTON build up a good cooperate relationship in drilling service. Currently, TDC’s main clients are from major oil & gas industries in China, such as  CNPC ,  Sinopec ,  CNOOC  and so on. The contents of the service cover the drilling bit service, the drill fluid service, PDM drill, Pressure-managed Drilling Technology Service, Geo steering technology and so on.