Non-crushing wellhead

Details Non-crushing wellhead Non-crushing wellhead

E - Fixed Constructions

21

B

166/47

E21B 43/12 (2006.01) E21B 33/03 (2006.01) E21B 33/04 (2006.01)

Patent

CA 2036453

NON-CRUSHING WELLHEAD 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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