COSL has five domestic-sited operation bases and more than 400 professional personnel. Being certified by DNV, it can provide various tailor-made services supporting by its own offshore conductor-driving penetration analysis software, casing cutting and beveling equipment, and adapted 26" casing power tongs. COSL has been widely acclaimed by Petro China, Conoco-Phillips, ENI , Devon Energy , and ROC Oil for providing excellent quality, high efficiency, and superior service.