Importance

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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 selective engagement and disengagement with the hanger, the connector being supported in the bore hole conductor casing in the region of the upper end of the bore hole conductor casing through a support assembly to prevent radial movement of the connector within the bore hole conductor casing, the upper end of the connector extending above the support assembly and including a stress joint which is adapted to be fixed to the lower end of the riser, the stress joint being adapted to accommodate the stress arising from the movement of the lower end of the riser relative to that part of the mudline riser-casing connecting assembly within the bore hole conductor casing.

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First Claim