Pipe joints or couplings – Serial,relatively movable portions
Patent
1989-10-17
1991-07-02
Nicholson, Eric K.
Pipe joints or couplings
Serial,relatively movable portions
285147, 175423, E21B 3304
Patent
active
050280791
ABSTRACT:
An improved slip suspension wellhead is disclosed for suspending a selected tubular member inside another without crushing. An inclined support surface is provided with a second support surface which may contact a portion of the slip assembly to halt axial movement of the slips relative to the wellhead body. The second support surface is placed along the inclined support surface at a pre-selected point in order to stop the radial movement of the slip gripping faces before the inner slip diameter is compressed below the sum of the drift diameter plus two times the maximum wall thickness for the selected tubular member. Therefore, the improved wellhead may utilize slips having substantially reduced axial length without danger of crushing the tubular member.
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McEvoy SB-3 Casing Hanger Brochure, pp. 36-37.
Ray, Randall, Casing Suspension Loads for Huber-Hercules Type CJ Heads, Feb. 25, 1982.
Hoff H. Milton
Smith L. Dean
Flanders Harold H.
Horn Alec H.
J. M. Huber Corporation
Nicholson Eric K.
Price Robert L.
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