The DNV final report indicated that the second tube was the segment of the drill string that was ejected after being cut by the blow out preventer shears.
32.
Subsea BOPs are connected to the offshore rig above by a drilling riser that provides a continuous pathway for the drill string and fluids emanating from the wellbore.
33.
During the drilling process, the drill string is periodically removed from the borehole and a bailer is lowered to collect the drill cuttings ( rock fragments, soil, etc . ).
34.
This displacement of the drill string ( the steel ) will leave out a volume of space that must be replaced with an equal volume of kick will definitely occur.
35.
"' Slips "'is a device used to grip and hold the upper part of a drill string to the drill floor on an Rotary table-machinery that makes the pipe rotate.
36.
In underbalanced drilling, however, there is a " rotating head " at the surface-essentially a seal that diverts produced fluids to a separator while allowing the drill string to continue rotating.
37.
The next major advance was in the 1970s, when downhole drilling motors ( aka mud motors, driven by the hydraulic power of drilling mud circulated down the drill string ) became common.
38.
In drilling a typical high-pressure well, drill strings are routed through a blowout preventer stack toward the hydrostatic pressure to counter opposing pressure from the formation being drilled, allowing drilling to proceed.
39.
A "'mud motor "'( or drilling motor ) is a progressive cavity positive displacement pump ( PCPD ) placed in the drill string to provide additional power to the bit while drilling.
40.
The combination of PDSC ( passive drill string compensation ) and AHC ( active heave compensation ) are now in operation on the semi-submersible drilling rig Seadrill West Sirius ( 2008 ).
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