E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/14.3
E21B 19/10 (2006.01) E21B 3/02 (2006.01) E21B 19/02 (2006.01) E21B 19/16 (2006.01) E21B 21/02 (2006.01) E21B 21/10 (2006.01)
Patent
CA 1223247
WELL DRILLING ASSEMBLY Abstract of the Disclosure. A well drilling assembly of the type in which a rotary device is attached to a drawworks, for example to the hoisting hook on a derrick, to which rotary device a hollow shaft is coupled, having a threaded end which is adapted for connection to a complementary threaded end on the drill string, and wherein a clamping/lifting means known as an elevator is suspended below the rotary device by two hanger struts. The shaft connected to the rotary device is telescopic. Outside the shaft a lifting means is provided for the lower part of the telescopic shaft. The two hanger struts which carry the elevator for one end of the pipe are means of a sliding holder known as a link hanger. The link hanger is axially mov- able by means of hydraulic cylinders. The lifting means for the lower part of the tele- scopic shaft consists of hydraulic cylinders which are constructed as a unit together with the hydrau- lic cylinders, the cylinders constituting piston rods for the hydraulic cylinders.
453802
Gowling Lafleur Henderson Llp
Maritime Hydraulics A.s.
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