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 CNOOC, Petro China, Shell, ,ENI , Conoco-Phillips, Devon Energy , and ROC Oil for providing excellent quality, high efficiency, and superior service.
The main services include：
· conventional casing and tubing running service of 36"to 2⅜"
· casing of 13CR-alloy and tubing running service ranging from 13⅜" to 2⅜"
· HTHP and special-sizes casing and tubing running
· highly-deviated-well surface casing running
· special thread type casing and tubing running
· conductor driving
· casing cutting
· locking/unlocking service
· top driving casing running
· wellhead assembling/ disassembling
