Drill collar is an important tool that used in well drilling process for oil/gas both onshore and offshore.
Drill collar conform to latest version of API Specification 7 and other related standards. Products are authorized to use API monogram
Drill collars are available in standard API configurations and connections are cut in accordance with API Spec. 7 & API RP 7G requirement. Special drill collar such as for high pressure well are also available.
- Drill collar are made of modified alloy steel fully heat treated in order to obtain high hardness.
- Cold rolling processing the thread ends to achieve good pressure-bearing ability, anti wearing out and longer life-span.
- Thread phosphor or copper coated to achieve good resistant-wearing ability and anti-thread gluing ability.