Nexus Engineering, is a leader in riser-based and riser-less system technology.
Do you have a design or installation need for an IWOCS or CWOR System?
Have you got an existing system that needs modification?
Nexus is experienced in Innovative Intervention Systems. IWOCS stands for Installation Workover Control System. Our company has the expertise in both; Riser-based and Riser-less Systems.
The Riser-Based system is a rig dependent system. It is clamped to the marine riser or drill pipe, depending on the completion and testing campaign. As a minimum, the following equipment is used for running a rig based IWOCS (Installation Work Over Control System):
• Hydraulic Power Unit (HPU) • Umbilical integrated to a pneumatic driven Reel • Chemical Injection Unit; typically for methanol • Electrical Power & Control Unit - for power and communication to the SCM • Subsea Distribution Units - IWOCS "Box" • Hydraulic & Electrical Flying Leads • Annulus Umbilical and Reel
Availability of rigs has become a challenge, especially when demand exceeds the supply. Open water subsea tree installations using DSV - tree on wire - has become an increasingly popular method for installation. Moreover, operators discover that a lot of rigs they have contracted tend to have space limitations especially when the rig is required to drill, install wellheads, complete the well and install Subsea Christmas Trees. The alternative that meets these challenges is what is known as AWOCS / RWOCS (MINI-IWOCS).
The enabling technology, otherwise known as Riser-Less IWOCS operates independent of the rig. The Riser-Less system utilizes a self-supporting umbilical system that can be deployed on diver support vessels (DSV) or a vessel (with AHC Crane) to provide intervention, subsea testing and workover control. The AWOCS is typically a rental system and allows flexibility that the riser-based system can not offer.
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Nexus is Certified by Bureau Veritas (ISO 9001:2008, ISO 14001:2004 & OHSAS 18001:2007 & MS 1722:2011 Standard)