VERTICALLY MOORED PLATFORM ANCHORING

摘要

An improved system for anchoring a floating vessel which is anchored only by parallel and essentially vertical conduits. The anchoring load is carried by units of concentric pipes including an outer riser pipe and inner strings of casing. Drilling wells and/or production of oil and gas or like operations are conducted through these casings. Means are provided for transmitting the tension of the inner casing strings to the floating vessel through the upper end of the outer riser pipe. Means are also provided to prevent excessive buildup of stresses in the upper end of the inner casing due to the bending caused by the excursion caused by the waves, the wind, and the current.