GB738195A - Improvements in or relating to a well drilling structure - Google Patents

Abstract

738,195. Raising derrick masts. MOORE CORPORATION, L. C. March 26, 1953 [July 29, 1952], No. 8388/53. Class 78 (4). Traction on a cable system joining a gin pole 16, Fig. 1, and a well-drilling mast 10, 11 first swings the pole from a reclining position up through the legs of the reclining mast and then raises the mast. In the form illustrated the gin pole and mast are pivoted respectively to structures 14 and 6 carried on a portable base 1, which may be the platform of a vehicle, and the mast rests on a support 8 while the gin pole rests between the upper ends of the support 6, the supports being of sufficient height to permit the engines 4, the draw works 3 and the rotary table 2 to be accommodated beneath the reclining mast and pole. A sling 21 comprising a length of cable doubled on itself is connected to the travelling block 17 and reeved around spaced pairs of pulleys 23, 22 on the mast before being attached to the upper end of the gin pole. When the winding drum 20 winds the drilling line 18 the tension on the sling 21 first raises the gin pole to the position shown in broken lines where a pair of guys 25 on the pole are taut and then raises the mast until sockets 2, Fig. 5, on the mast engage around a tube 28 at the upper ends of the gin pole to which tube the sockets are secured by bolts 29. A similar procedure is employed to lower the mast and pole.