Wellhead hanger

摘要

The hanger apparatus includes a segmented bowl structure which includes inner tapered surfaces which are adapted to coact with the outer surfaces of the slips supported on the bowl segments and a lower outer tapered seat which is adapted to engage a shoulder within the well structure. A packing structure is connected to the upper end of the bowl segments and includes an upper plate ring, a lower seat ring having a lower outer seating surface, and a resilient packing ring positioned between the upper plate ring and the lower seat ring. Cap screws engage upper plate ring and extend through the packing ring and the seat ring and are threaded into the bowl segments. The upper plate ring moves downward with the initial downward movement of the bowl segments during setting to compress the packing ring into sealing engagement between the exterior of the string and the interior of the wellhead housing. The exterior of the slips in one form of the invention include a plurality of compound tapers which coact with the bowl tapers. The lower taper of each section of the slip tapers is at a very slight angle with respect to the axis of the unit and the upper taper of each section of the slip tapers is at a substantially greater angle to the axis of the unit than that of the lower taper. In another form of the invention the slight angle taper is limited to the lower portion of the slip camming surfaces and is engaged by a finger supported from the lower portion of the bowl segments.