Drilling rig upgrades

Deepwater Upgrades - The move to explore in ever deeper depths requires drilling rigs with increased capabilities. Houlder has developed a number of conversions to increase the deckload, install additional mud pumps and mud storage or convert from a mooring system to dynamic positioning. Increasing the deckload demands additional buoyancy and stability, typically requiring blisters to be fitted to existing columns or additional columns as well as sponsons on the submerged pontoons. Houlder naval architects are experienced in the design and analysis of all elements of this work including the stability, motions and structural analysis of the rig as well as the new steelwork and its connection to the existing hull.


Surface BOP - Houlder has undertaken extensive studies and design work to develop existing handling arrangements to accommodate a surface BOP and lower marine riser package. Due to the cramped conditions under the drill floor, this requires careful consideration to achieve a workable and cost efficient solution.

BOP Transporter - Safely handling a 250 tonne weight on a moving platform and through the splash zone is an interesting design challenge. Houlder successfully designed, manufactured and installed a system on the Kan Tan IV which has proved reliable and effective in service.

Mud Pump Installation - The installation of an additional mud pump to enable a rig to drill in higher pressure wells requires careful design of structure and systems in the congested mud pump room. Houlder is experienced in all aspects of the work from the initial survey through design to the final installation and commissioning.