Drill Collar By Xi'an Shanglin Oilfield Equipment Co.,ltd

We are a reliable enterprise engaged in supplying a huge spectrum of Drill Collar in Xian, Shaanxi, China. The Drill Collar is used between the drill pipe and the bit in the drill stem. It is used to put weight on the bit so that the bit can drill.Drill Collars are manufactured from AISI 4145H or 4145H modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finishes can be provided.Drill collars are trepanned and drifted to API Spec 7. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7 requirements. A hardness range of 285-341, Brinell Hardness and Charpy gV h notch minimum impact strength of 40 ft-lb at 70OF are guaranteed one inch below the surface.