As offshore water depths increase to over 10,000 feet, well depths exceed 34,000 feet and extended reach targets push out over 35,000 feet, operators are increasing the setting depths of larger diameter and heavier casing strings. These offshore designs require landing strings with hoisting capacity approaching two million pounds.
The nature of deepwater and ultra-deep water well design is driving the requirement for higher tensile capacity landing strings. Not only is water depth increasing, but well target depths below
the mudline are being extended.
These factors, combined with the often narrow margin between pore pressure/mud weight and fracture gradient, are causing well designers to set more intermediate casing strings. In turn, large diameter, heavy casing strings are pushed to deeper setting depths in order to maintain hole size and reach the intended hydrocarbon targets.
Recognized as the world’s leading manufacturer of drilling products, NOV Grant Prideco produces superior landing strings to confront these challenges. Offerings include welded assemblies of up to 1-1/4 inch wall thickness and integral assemblies built to customer requirements. Landing strings with hoisting capacity approaching 2.3 million pounds can be provided.
An ideal landing string should provide adequate load-carrying capacity and satisfactory hydraulics, while minimizing assembly weight and connection make-up torque. NOV Grant Prideco’s state-of-the-art landing strings address application requirements individually through features such as thick-wall slip sections for increased slip-crushing capacity, high strength grade tubes to reduced wall thickness and double-diameter tool joints to increase elevator capacity.
Landing strings are specified by OD and nominal wall thickness, not by nominal weight.
