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  • Slip-based landing string system expands limit for deepwater casing


    J. Brock, R. B. Chandler, M. Jellison, L. Sanclemente, R. Robichaux and M. Saleh

    With water depths increasing to over 10,000 ft, offshore well depths exceeding 34,000 ft and extended-reach targets pushing out beyond 35,000 ft, operators are deepening the setting depths of larger-diameter and heavier casing strings. These offshore designs require landing strings with hoisting capacity approaching two million pounds (2 MM lb). The nature of deepwater and ultra-deepwater well designs is driving the requirement for higher-tension-capacity landing strings. Not only is water depth increasing, but well target depths below the mudline are being extended. This, combined with the often narrow margin between pore pressure/mud weight and fracture gradient, is causing well designers to set more intermediate casing strings. This, in turn, is pushing large-diameter, heavy casing strings to deeper setting depths to maintain hole size and reach the intended targets. As operators and manufacturers investigated the requirements for ultra-high-capacity landing strings, slip crushing was quickly identified as a major consideration.

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