Back to results
US 7,210,670 B2Granted
Drawworks apparatus
OwnerCharles Gllen Franksinventor
Life of this patent
Estimating the term…
Abstract
A drawworks having a main drum spool, a main drum shaft which passes through and is rotatably and concentrically supported by the main drum spool, an auxiliary drum spool, respective drum shafts passing through and rotatably and concentrically supported by the drum spools in a manner in which wireline pull from the spools is isolated therefrom, a clutch mechanism rotatably connected to the shafts and brake mechanisms respectively connected to the main drum spool and the auxiliary drum spool outside the working area of the drawworks.
Claims20
A drawworks apparatus for raising and lowering items down a well bore, said drawworks comprising:
- a frame having a working area within inner surfaces thereof where the raising and lowering of items occurs;
- a main drum spool having at least a portion situated within said working area for raising and lowering items down the well bore via a length of cable wound thereon, said main drum spool extending through and rotatably mounted directly to said frame by a first set of bearings;
- a main drum shaft rotatably and concentrically supported by said main drum spool in a manner in which said main drum shaft is isolated from wireline pull from said main drum spool imposed on said main drum spool during operation of said drawworks;
- an auxiliary drum spool for raising and lowering items down a well bore via a length of cable wound thereon, said auxiliary drum spool rotatably supported by said frame by a second set of bearings;
- an auxiliary drum shaft rotatably and concentrically supported by said auxiliary drum spool in a manner in which said auxiliary drum shaft is isolated from wireline pull from said auxiliary drum spool imposed on said auxiliary drum spool during operation of said drawworks;
- a drive mechanism located outside of said working area for rotating said main drum spool and said auxiliary drum spool, said drive mechanism providing a driving force input through said auxiliary drum shaft via an input chain drive, said main drum spool having a clutch for engaging said drive mechanism located outside the working area and externally separated from said input chain drive;
- and
- a first brake assembly located outside of said working area, said first brake assembly being connected to said main drum spool so as to reduce the rate of rotation of said main drum spool during operation of said drawworks.
5 more elements
A drawworks apparatus comprising:
- a frame which rotatably supports a drum spool, said drum spool supporting within an operating area of said frame where items are raised and lowered down a well bore a length of wire thereon for raising and lowering items down a well borg, said drum spool being mounted directly to said frame such that operational forces imposed upon said drum spool are transmitted directly to said frame;
- a drive mechanism for rotating said main drum mechanism, said drive mechanism being located externally relative to said frame at a point outside of said operating area;
- a band brake assembly positioned external to said frame and said operating area for reducing the rate of rotation of said main drum mechanism, said brake band assembly being connected at one end thereof to a rotatable brake shaft via a first linkage assembly and to said frame at a second end thereof via a second linkage assembly,
- wherein said first linkage assembly includes a bracket and link connection for connecting said bracket to said brake shaft in such a manner that prevents said brake shaft from rotating past center.
1 more element
A drawworks apparatus comprising:
- a frame which rotatably supports by direct connection a drum spool, said drum spool rotatably and concentrically supporting a drum shaft therein such that said drum shaft is isolated from wireline pull from said drum spool;
- a drive mechanism connected to said drum shaft for driving said drum spool, said drive mechanism being positioned outside a working area of said frame where items are raised and lowered down a well bore;
- a band brake assembly for reducing the rate of rotation of said drum spool, said band brake assembly being positioned outside of said working area and connected at one end thereof to a rotatable brake shaft via a first linkage assembly and to said frame at a second end thereof via an adjustable second linkage assembly,
- wherein said second linkage assembly comprises a substantially tubular brake beam member which extends through and connected to said frame via a pair of anchors, a bell crank which is rotatably connected to each one of said anchors, and an equalizer system rotatably connected at one end to said bell crank and at another end to the dead end of said band brake assembly.
1 more element
Dependencies are inferred from the claim text.