03-02-2022 дата публикации
Номер: US20220034189A1
A pressure energised seal for a wellhead, in particular, provides a seal of an annulus between an inner wellhead casing member and an outer wellhead casing member. The wellhead incorporates a clamping arrangement whereby the outer member is arranged to be deflected radially inwardly in order to grip and secure the inner member within the bore of the outer member. Also, a seal for use in such a clamping arrangement. In particular, the seal includes a sealing lip which locates within a groove provided in the outer clamping surface of the inner member. A seal is activated and created as the outer member is clamped inwardly since this causes the outer member to compress the inner member and to reduce the diameter of the inner member. Also, a well and a method of sealing an annulus in a well. 1. A sealing arrangement comprising an inner well casing and a seal for sealing an annulus in a well , the annulus being formed between an outer surface of the inner well casing and an outer well casing of the well wherein the inner well casing comprises:a central longitudinal axis which extends along a longitudinal axis of the inner well casing; andan outer clamping surface which is arranged to be secured and clamped by the outer well casing, the outer clamping surface being located at an initial radial distance from the central longitudinal axis of the inner well casing;the seal comprising:a flexible metal sealing lip which projects radially outwardly and away from the central longitudinal axis of the inner well casing, the metal sealing lip having a distal sealing surface for sealing against an inner surface of the outer well casing; andwherein, in use, pressure within the annulus is arranged to urge the sealing surface towards the inner surface of the outer well casing.2. A sealing arrangement according to claim 1 , wherein claim 1 , prior to use claim 1 , the sealing surface locates at an initial radial distance relative to the central longitudinal axis which is less than or ...
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