Abstract: A mudline riser-casing connecting assembly for an underwater well, where the mudline riser-casing connecting assembly comprises a bore hole conductor casing adapted to be fixed in a bore hole in the mudline and terminating at its upper end at or in the region of the mudline and which is adapted to support a fluid conveying riser and well bore casing, the assembly further comprising an annular landing shoulder on the inner face of the bore hole conductor casing at a position spaced downwardly from the upper end of the bore hole conductor casing and an annular hanger assembly adapted to be mounted to the upper end of the well bore casing, the annular hanger assembly being engagable with the landing shoulder to support the well bore casing from the landing shoulder, the mudline riser-casing connecting assembly further comprising a connector adapted at one end to be connected with the hanger assembly and adapted to be connected at the other end to the lower end of the riser, the connector being capable of selecti

Abstract: A surface blow-out prevention support system comprising a support accommodating the blow-out preventor which is adapted to be supported from an associated support structure, the support facilitating connection between the blow-out prevention system and a riser extending from an underwater well, a connector providing a fluid connection between the blow-out preventor and the associated support structure, the support comprising a plurality of suspension members extending between the associated support structure and the support, where the suspension members are mounted to the support at angularly equidistant positions around the central axis of the support, each suspension member comprising a flexible cord member extending between the support and the associated support structure through a sheave arrangement, the sheave arrangement including a resilient tensioning member which is capable of resilient longitudinal extension to cause the spacing between the support and the associated support structure to be varied.