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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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