| 摘要 |
An outer tubular wellhead member 11, such as a subsea tree, has wickers in the seal profile 15, formed in a bore 17 of the outer tubular wellhead member, that axially undulate around the bore. Each wicker (21, figs 2 & 6) varies axially in position around the circumference of the bore so that when a seal member engages each wicker, the wicker deforms the surface of an annular seal (47, figs 4 & 5) to form circumferential sealing bands at each wicker from an upper end of the sealing profile to a lower end of the sealing profile, upper portions of each wicker deforming the surface of the annular seal before lower portions of the same wicker so that fluid between adjacent wickers flows from the higher axial location of the wicker to the lower axial location of the wicker to limit hydraulic lock.
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