Abstract: 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.

Abstract: 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.

Abstract: A mudline connector including a compression adaptor which can be elastically deformed onto an internal tubular member. The compression adaptor deflects inwardly to grip upper and lower sealing mandrels, providing axial and bending load support and creating a seal to isolate bore pressure from an outer annulus. The clamping arrangement provides a sealed connection between two well casing sections extending in opposite axial directions. The well casings are gripped and held in an end to end configuration by a radial load applied internally by a compression ring. The connector is activated by introducing pressure to activate pistons which in turn provide an axial thrust to stroke the internally tapered compression ring along the externally tapered compression collar, effectively creating an interference fit therebetween. This deflects the inner surface of the compression collar inwardly, deflecting the compression adaptor inwardly to grip the outer surfaces of the upper and lower sealing mandrels.