Derrick for drilling

Details Derrick for drilling Derrick for drilling

E - Fixed Constructions

21

B

255/17

E21B 15/02 (2006.01) E21B 19/00 (2006.01)

Patent

CA 1231937

25871-51 ABSTRACT OF THE DISCLOSURE A derrick for drilling and maintenance of oil and/or gas wells comprises a portal-shaped derrick structure installed on the drilling deck, consisting of an upper traverse and two spaced-apart, substantially parallel, upright derrick components which together define a free space, within which a hydraulic elevator connected to a drilling machine for the drill string is adapted to travel along stationary, upright rack rails. The vertically movable elevator, in a manner known per se, is driven by means of hydraulic motors having gears that engage with the rack rails. P L391 EH/ale

474921

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