Aquaterra Energy and Plexus Holdings have developed a light weight, dual barrier HPHT riser system which can be deployed by a jack-up to enable an alternative to semi-submersible installation for HPHT well operations.
The technology is suitable for shallow water depths up to 150 meters and harnesses the combined capabilities of the company’s subsea technologies.
By uniting Aquaterra Energy’s HPHT riser system and Plexus’ POS-GRIP wellhead engineering technology, an inner riser string is installed inside a conventional high pressure riser (HPR) to span the gap between a dry surface BOP and a wet subsea tree. It provides full 20,000 psi capability and utilities all metal-to-metal gas tight seals on both the external and internal riser string.
Ben Cannell, product line manager, Riser and Conductor Solutions with Aquaterra Energy, said: "The innovation carries with it the potential to change the industry’s default position of selecting semi-submersible rigs for developments in water depths up to 150 meters, which today make up over 60% of all subsea developments worldwide. It renders the use of jack-up rigs in such scenarios both feasible and attractive in both a technical and commercial context."
Craig Hendrie, technical director, with Plexus Holdings, added: "This is a new, technology-led drilling proposition to the international market and is one that directly addresses the industry’s cost-reduction agenda. Amid the ever-increasing industry focus on HPHT operations, this methodology represents an innovative and cost-effective alternative while maintaining safety, integrity and operational performance."
Plexus is delighted to have been awarded the globally recognised OPITO approval of its competency management system (CMS) known as Competency@Plexus.
Working in a safety critical environment, it was recognised that having a robust CMS would provide the following organisational benefits;
- Demonstrate commitment to maintaining operational and safety standards
- Demonstrate employee competence to clients and regulatory bodies
- Through regular external audit ensure continuous improvement
- Support the Company’s safety value; adopt a ‘real life approach’ to safety
- Provide the Company and customers with the quality of resources required, now and in the future
- Enhance business performance and secure competitive advantage
Competency@Plexus is a bespoke system which reflects the unique nature of POS-GRIP® Technology and products with all assessments of competence being carried out by technically competent, fully qualified assessors. The OPITO accreditation is a reflection on the Company’s determination and commitment to develop a meaningful and transparent competency management system made possible by the drive and enthusiasm of all those involved to embed this process within the business.
We are delighted to launch the Plexus Python® subsea wellhead system at Offshore Europe 2015, adding to our already successful surface and jack up wellhead products.
A Joint Industry Project (JIP) was initiated by Shell in 2011 to develop and test a new class of subsea wellhead system. The JIP's objective was to build, test and commercialise a new system, based on Plexus' patented POS-GRIP® friction-grip technology, to address key technical issues and challenges highlighted by regulators following the Gulf of Mexico incident in April 2010. The JIP team also developed the performance verification requirements for the system, which are significantly tougher than basic API standards used by conventional systems.
Python uses our “HG” Sealing technology for rigid metal-to-metal annular seals designed to match the standard of premium casing couplings. A future development of this system will be to include subsea annulus access capability to address sustained casing pressure situations, together with diagnostic and remedial capability. The inclusion of these key features and capabilities in a subsea wellhead will be an industry first.
The benefits of the system include unprecedented levels of qualification testing, leading to high integrity even for 20ksi applications. Installation methods have been optimised, leading to time savings of several days per well in reduced trip times compared to conventional technology.
Launch confirmed for 11.00am on Tuesday 8th September at SPE Offshore Europe – with Ben van Bilderbeek, CEO of Plexus Holdings plc and Fergus Ewing MSP, Minister for Business, Energy and Tourism.
Colin Ritchie, Managing Director