Changes

The hoisting system includes the parts of the rig that are used to raise the [http://www.glossary.oilfield.slb.com/en/Terms/d/drillstem.aspx drill stem]. The hoisting gear parts include the drawworks (15 in [[:file:Land rig example drawing.png|Figure 1]]), crown block (1), and traveling block (4). The ''drawworks'' is a large winch on which the [[drill line]] spools. The ''drill line'' is wire rope that is strung between the ''crown block'' (a pulley located at the top of the derrick), the traveling block, and the drawworks. The drill line can be strung in multiples for a total of of 4,6, 8, 10, or 12 lines. More lines means more lifting capacity but a slower running speed. The drill line needs to be “cut and slipped” at periodic ton-miles to distribute the line wear and stress. A weight indicator (16) is attached to the drill line so that the driller can measure the [[drill string weight|drill string]], [[slack-off weight|slack-off]], and [[pick-up weight]]s. This information helps determine the amount of [[hole friction]] and the correct amount of weight to put on the bit. The drawworks also transfers power to make up and break out the drill string via the tongs (13 and 14).

The hoisting system includes the parts of the rig that are used to raise the [http://www.glossary.oilfield.slb.com/en/Terms/d/drillstem.aspx drill stem]. The hoisting gear parts include the drawworks (15 in [[:file:Land rig example drawing.png|Figure 1]]), crown block (1), and traveling block (4). The ''drawworks'' is a large winch on which the [[drill line]] spools. The ''drill line'' is wire rope that is strung between the ''crown block'' (a pulley located at the top of the derrick), the traveling block, and the drawworks. The drill line can be strung in multiples for a total of of 4,6, 8, 10, or 12 lines. More lines means more lifting capacity but a slower running speed. The drill line needs to be “cut and slipped” at periodic ton-miles to distribute the line wear and stress. A weight indicator (16) is attached to the drill line so that the driller can measure the [[drill string weight|drill string]], [[slack-off weight|slack-off]], and [[pick-up weight]]s. This information helps determine the amount of [[hole friction]] and the correct amount of weight to put on the bit. The drawworks also transfers power to make up and break out the drill string via the tongs (13 and 14).

The ''[http://www.glossary.oilfield.slb.com/en/Terms/d/derrick.aspx derrick]'' supports the crown block and provides a place to stack pipe that is pulled out of the hole. The depth rating of the derrick is related to the size of the rig. The height of the derrick is commonly referred to in multiples of pipe joints (a joint of pipe is approximately 30 ft long). Rigs that can stack double joints of drill pipe are called ''double derricks'', and those that stack three joints are called ''treble derricks''. Part way up the derrick are the ''monkey board'' (3) and ''[[pipe finger]]s''. The derrickman handles the top end of each stand of pipe from the monkey board during trips. The pipe is racked in the finger boards and tied off to keep it from falling. The derrick ''substructure'' (23), the platform under the derrick, is rated by set back capacity; that is, the weight of the drill string stacked in the derrick plus the weight of [ http://www.glossary.oilfield.slb.com/en/Terms/c/casing.aspx casing] that can be lifted. The height of the substructure is dictated by the height of the [http://www.glossary.oilfield.slb.com/en/Terms/b/blowout_preventer.aspx blowout preventers] (38). The top of the substructure is called the ''[http://www.glossary.oilfield.slb.com/en/Terms/d/derrick_floor.aspx derrick floor]''. This is the primary working area of the rig.

The ''[http://www.glossary.oilfield.slb.com/en/Terms/d/derrick.aspx derrick]'' supports the crown block and provides a place to stack pipe that is pulled out of the hole. The depth rating of the derrick is related to the size of the rig. The height of the derrick is commonly referred to in multiples of pipe joints (a joint of pipe is approximately 30 ft long). Rigs that can stack double joints of drill pipe are called ''double derricks'', and those that stack three joints are called ''treble derricks''. Part way up the derrick are the ''monkey board'' (3) and ''[[pipe finger]]s''. The derrickman handles the top end of each stand of pipe from the monkey board during trips. The pipe is racked in the finger boards and tied off to keep it from falling. The derrick ''substructure'' (23), the platform under the derrick, is rated by set back capacity; that is, the weight of the drill string stacked in the derrick plus the weight of [http://www.glossary.oilfield.slb.com/en/Terms/c/casing.aspx casing] that can be lifted. The height of the substructure is dictated by the height of the [http://www.glossary.oilfield.slb.com/en/Terms/b/blowout_preventer.aspx blowout preventers] (38). The top of the substructure is called the ''[http://www.glossary.oilfield.slb.com/en/Terms/d/derrick_floor.aspx derrick floor]''. This is the primary working area of the rig.

The ''[http://www.glossary.oilfield.slb.com/en/Terms/c/catwalk.aspx catwalk]'' is the deck located to the side of the derrick floor and between the pipe racks (22). Joints of drill pipe and casing are rolled from the pipe racks where they are stored on the catwalk and hoisted up through the [http://www.glossary.oilfield.slb.com/en/Terms/s/slide.aspx slide] (21) and [http://www.glossary.oilfield.slb.com/en/Terms/v/vee-door.aspx V-door]. The catwalk is also the primary location to process [[Core handling|core]] and assemble [[Basic tool table|wireline logging tools]].

The ''[http://www.glossary.oilfield.slb.com/en/Terms/c/catwalk.aspx catwalk]'' is the deck located to the side of the derrick floor and between the pipe racks (22). Joints of drill pipe and casing are rolled from the pipe racks where they are stored on the catwalk and hoisted up through the [http://www.glossary.oilfield.slb.com/en/Terms/s/slide.aspx slide] (21) and [http://www.glossary.oilfield.slb.com/en/Terms/v/vee-door.aspx V-door]. The catwalk is also the primary location to process [[Core handling|core]] and assemble [[Basic tool table|wireline logging tools]].