Drill collar – Drilling Equipment – Readyzone

Drill collar Drill collars are used to provide weight on bit and to keep drill pipe in tension. Drill pipe has a comparatively low stiffness, which makes it susceptible to bucking when under compression. Repeated bucking will eventually lead to drill pipe failure. Since elastic members can only buckle in compression, fatigue failure of drill pipe can be eliminated by…

Continue reading

Auxiliary brake ( drilling rig ) – Readyzone

Auxiliary brake During tripping-out operations, the drill pipe is removed in stands ( ̴93 ft, depending on size of derrick etc. ) ion such a way that the pipe is decelerated during the last 5-10 ft before being arrested in the rotary table with the slips. Thus, during tripping out operations, the main brakes are not required to absorb excessive…

Continue reading

Cat shaft and coring reel group ( drilling rig ) – Readyzone

Cat shaft and coring reel group The cat shaft and coring reel group comprises the cat heads, the cat shaft assembly and the coring reel drum( Figure 1 ). The cat heads are spool-shaped, rotating drums powered by the jack shaft assembly. They consist of friction and mechanical rotating heads. The friction cat heads are used to transport heavy objects…

Continue reading