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Pyramid Manufacturing Company

Larry K Lawrence

John J Grisaffi

A drilling mast and drawworks elevator are pivotally secured to a substructure support with a frame secured to the support and extending upwardly between the drilling mast and elevator support. A cable on a rotatable drum on the drawworks elevator extends from a traveling block in the drilling mast, around the drilling mast crown block, to a drum on the drawworks elevator, and a hook is suspended by the traveling block in the drilling mast. Sheaves are mounted adjacent the upper end of the frame. Mast raising sheaves are mounted in the drilling mast as are deflection sheaves, and a slingline equalizer is connected with the hook means, with sheaves positioned thereon. A pair of cable slings, each of which has one cable end connected to the drilling mast with the other cable end connected to the drawworks elevator, extends continuously and respectively from their respective connections with the drilling mast to extend over one of the frame sheaves, under one of the mast raising sheaves, around one of the deflection sheaves, around one of the sheaves in the equalizer means, then around another deflection sheave, underneath another mast raising sheave, over another frame sheave to extend to the connection on the drawworks elevator.

Cable sling arrangement for pivoting a drilling mast and drawworks

Low level base means extend longitudinally on the earth's surface. Drilling mast support means are positioned adjacent and pivotally connected to the base means and setback tower means are pivotally connected to the mast support means and to the base means. Drilling mast means are secured to the mast support means. Lifting frame means are connected to the drilling mast support means whereby said drilling mast support means, mast connected thereto and setback tower means may be simultaneously elevated from a reclined position to an upright position on the base means. Cable means may be secured at one end to the lifting frame means and extended around sheave means on the base means over sheave means on the lifting frame means and under sheave means on the mast support means. The other end of the cable is wound on the drawworks drum or with any other suitable power source to exert a pull on the cable and elevate the mast support, mast and setback tower to an upright position on the base means where the mast may be secured in upright position. Elevatable drawworks support means is pivotally connected to the low level base means adjacent the other side of the drilling mast support means. The lifting frame means is then secured in upright position adjacent the upright mast support and mast and the end of the cable means that was connected to the lifting frame means is disconnected therefrom and secured to the forward end or edge of the elevatable drawworks. The same power source, that is, either the elevatable drawworks or another power source may then be used to raise or elevate the drawworks into position adjacent the mast. The drawworks support means is provided with rotary table support means projecting from the drawworks support means. When the elevatable drawworks support means is raised to position it adjacent the upright drilling mast support means in a manner well known, the rotary table support means is properly positioned adjacent the drilling mast setback tower means so that the rotary table support means may be secured to the elevated setback tower to form a rigid substructure for the upright drilling mast.

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Houston, TX, United States of America

Larry K Lawrence