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RIG COMPONENTS

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Definitions

51. Standpipe - The standpipe is that pipewhich carries mud from the rig floor into

the derrick to the kelly hose. It must be pressure-tested to the working pressure ofthe BOPs.

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52. Kelly Hose - The kelly hose is a sectionof high-pressured hose connecting the

standpipe and the swivel. The kelly hoseallows for the vertical movement of the drillstring as well as circulation of fluid down

the drill string.

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53. Substructure - the substructure providesthe support for the derrick and derrickloading. It also provides the necessary

clearance beneath the rig floor for he preventor stack.54. Keyway - The keyway is the opening onan inland barge or offshore jackup in whichthe drilling operations are performed.

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56. Moonpool - The hole through a floateror semi-submersible structure is which thedrilling operations are performed.

57. Motion Compensator - A pneumatic,hydraulic surface unit that compensates forthe heave of a drillship or semi-submersible.This allows the drill string and bit to remainstationary with respect to the earth.

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57. Bumper Subs - The bumper sub is adownhole motion compensator. It operatesas a slip joint. Most bumper subs have a 3-5

feet stroke and can be run in tandem formotion exceeding 3-5 feet. The bumper subis used on floating operations to reduce the

heaving motion of drillships or semi-submersibles on the bits.

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57. Bumper Subs, cont. - A disadvantage ofthe bumper sub is maintenance costs bothfor the tool itself and lost time due to

tripping pipe when one fails. Furthermore,the position of the bumper sub is not everreally known while drilling operations are

being carried out, so its effectiveness can belimited.

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58. Pods and Control Lines - The pods andcontrol lines are used in subsea operations;the control lines run from the accumulator

to the pods which are located on the subseaBOP stack. These two devices areresponsible for transmitting the hydraulic

pressure from the accumulator to actuate thevarious functions of the subsea BOP stack.

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59. Cat Walk - The cat walk is where the pipe is laid down from the drill floor. Anyelevated walkway may be referred to as acatwalk.