RETAI is a specialist of manufacturing large OD casing pipe, from 20” to 30” and also the only one manufacturer in China with the capacity to produce casing pipe as large as 30”. The company has a large diameter casing production line which fills the blank in producing large diameter casing.

Oil Casing end connection types: short round connection (STC), long round connection(LC), buttress connection(BTC) and the premium connection.

The steel grade of oil casing: J55 K55 N80-1 N80-Q L80 C90 T95 P110, etc.

Application:

1. OCTG mainly used for oil and gas well drilling and gas transportation.

2. Casing is lifeline of maintain oil well running, due to different geological conditions, underground complex stress state, pulling, pressing, bending, torsional stress acting on the combined effect of the casing, which put forward higher requirements on the the casing quality. Once the casing itself has been damaged due to same reasons, it may led to the reduction of the well output, even scrapped.

3. Oil casing is a large-diameter pipe, played the role of fixed oil and gas wells, or wellbore wall. Casing is inserted into the wellbore, the fixed with cement to prevent the borehole spaced formation and borehole collapse, and to ensure that the drilling mud circulation, in order to facilitate drilling mining.