By Mark J Kaiser
Jackups, semisubmersibles and drillships are the marine vessels used to drill offshore wells and are talked about jointly as cellular offshore drilling devices (MODUs). MODUs are provided via newbuild building and function during the international in hugely aggressive nearby markets. The Offshore Drilling and Rig building industry within the Gulf of Mexico examines the worldwide MODU provider and development and describes the commercial affects of rig building within the United States.
The commercial association and significant gamers within the agreement drilling and building markets are defined and labeled. Dayrates within the agreement drilling marketplace are evaluated and hypotheses concerning dayrate components are confirmed. versions of contractor decision-making are built, together with a net-present worth version of newbuilding funding and stacking judgements, and marketplace capitalization types are derived. Jackup building shipyards and approaches are reviewed besides estimates of work, gear, and fabric expense in U.S. building. Derivation of newbuild and alternative expense capabilities completes the treatise.
The entire and authoritative assurance of The Offshore Drilling and Rig building marketplace within the Gulf of Mexico makes it an incredible reference for engineers, execs, coverage analysts, govt regulators, lecturers and different readers eager to examine extra approximately this crucial and engaging industry.
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Extra info for The Offshore Drilling Industry and Rig Construction in the Gulf of Mexico
W. Thornton, an early drillship built in 1965 (Source: University of North Texas) Fig. 18 The Glomar III drillship built in 1966 (Source: National Library of Australia) 22 1 Mobile Offshore Drilling Units Fig. 2 Displacement (tons) 75,000 54,000 105,000 Variable load (tons) 20,000 15,000 22,000 Hook load (tons) 1,250 1,000 1,250 Mud pumps (number Â hp) 4 Â 2,200 4 Â 2,200 4–6 Â 2,200 Modern Drillships Prior to the late 1990s, generations were generally not used to describe drillship construction, but when the Discoverer Enterprise was delivered in 1999 it was described as a fifth generation vessel, analogous to the fifth generation semis that were being built at the time (Fig.
11 Mat foundation (Source: Spartan Offshore) Fig. 2 Motion Compensation Floating rigs require motion compensation systems to correct for vertical movement of the rig due to waves. Two separate motion compensation systems are required to control the tension on the marine riser and the drill string. A drill string 16 1 Mobile Offshore Drilling Units Fig. 13 Diagram of a drill string compensator (Source: NOV) compensator (DSC) keeps the drillbit on the bottom of the hole and within the weight limits established by the driller while a riser tensioner is used to maintain the tension on the drilling riser.
By the late 1990s and early 2000s, technology had matured so that deepwater and ultradeepwater drilling in 7,500–10,000 ft water depths was possible. 4 Semisubmersibles 19 Fig. 15 The West Alpha, a fourth generation semisubmersible built in 1986 (Source: Seadrill) BOP controls are integrated and computer controlled. Fifth generation units often have triply redundant dynamic positioning (DP3), powerful mud systems, and automated pipe handling. Sixth generation rigs have water depth capability of 10,000 ft and use modular top drive systems (Fig.