API Oilfield Onshore Offshore AC DC Gear Chain-Like Oil Drilling Rig Drawworks

Drawworks   is   the   primary   hoisting   machinery   that   is   a   component   of   a   rotary   drilling   rig.   Its   main   function   is   to   provide   a   means   of   raising   and   lowering   the   traveling   blocks.   The   wirerope   drilling   line   winds   on   the   drawworks   drum   and   extends   to   the   crown   block   and   traveling   blocks,   allowing   the   drill   string   to   be   moved   up   and   down   as   the   drum   turns.   The   segment   of   drilling   line   from   the   drawworks   to   the   crown   block   is   called   the   "fast   line".   The   drilling   line   then   enters   the   sheaves   of   the   crown   block   and   is   makes   several   passes   between   the   crown   block   and   traveling   block   pulleys   for   mechanical   advantage.   The   line   then   exits   the   last   sheave   on   the   crown   block   and   is   fastened   to   a  mast   leg   on   the   other   side   of   the   rig   floor.   This   section   of   drilling   line   is   called   the   "dead   line".   A   modern   drawworks   consists   of   five   main   parts:   the   drum,   the   motor,   the   reduction   gear,   the   brake,   and   the   auxiliary   brake.   The   motors   can   be   AC   or   DC motors,   or   the   drawwworks   may   be   connected   directly   to   diesel   engines   using   metal   chain like   belts.   The   number   of   gears   could   be   one,   two   or   three   speed   combinations.

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