Complemented by offshore drilling and workover teams totaling more than 2500 personnel, COSL annually manages and operates over fifty drilling/workover rigs with more than 1200 wells. The operation areas are offshore China , the Southeast Asian and the Middle East.
The main services include：
drilling and completion
routine workover and overhaul
management and drilling/workover equipment refit and upgrading
modular drilling/workover rigs manufacture, relocation, and offshore installation
