EXPLORATION • DRILLING • FIELD SERVICES
ELIMINATING CORROSION RISK in FIRESAFE VALVES S
evern Glocon Group is extending its range of triple offset butterfly valves with a new solution that
avoids galvanic corrosion in saline applications, without compromising firesafe capability. The OCTSW innovation was driven
by market feedback from offshore oil and gas operators in relation to seawater service valves used for fire safety. It ensures graphite parts – which can increase the susceptibility of neighbouring metals to corrosion when exposed to seawater – do not contact line media. Seawater service valves play an
integral role feeding water in the event of fire on an offshore platform or vessel. Their ability to either supply or isolate sections of the water line is a critical safety feature. Eliminating galvanic corrosion while maintaining firesafe credentials has been an enduring challenge for the industry.
Severn’s new valve design overcomes this limiting factor and recently passed fire testing in accordance with the latest editions of API 6FA, API 607 and ISO 10497. Mark Breese at Severn
says his team focused on fully isolating graphite parts from line media, or removing them from the valve entirely. “Triple offset valves are generally constructed with graphite packings, gaskets and laminated metal/graphite seals. In normal operation this noble material provides good service, but increased risk of galvanic corrosion in seawater applications has been an ongoing concern for offshore operators. Our team overcame technical challenges to develop a sustainable solution that
removes or replaces graphite. Their success builds on our pioneering oblique cone technology (OCT) for triple offset valves.” The OCT is central to this new
solution. The ‘infinite circle’ geometry of the design enabled the R&D team to develop a hybrid seal technology that eradicates the need for graphite. l
For more information visit
www.severnglocon.com
FIRST CEMENTLESS COMPLETION using NOVEL ANNULAR ISOLATION
W
elltec has announced the first deployment of a truly cementless completion, in
the Republic of Congo during the second quarter of 2019. Building on the experience gained through the continuous deployment of the Welltec Annular Barrier (WAB) in the Moho North Albian field, which was awarded the first quarter of 2017, Total E&P Congo has pushed the boundaries of metal expandable annular sealing
technology even further by deploying the world’s first cementless completion using the Welltec Annular Isolation (WAI) in open hole. The WAI uses multiple metal expandable packers to provide long length open hole zonal isolation to replace the functions of traditional cement, leading to gains in efficiency in the overall well construction process. It significantly reduces the free annulus space between the liner/casing and the open hole, which can be beneficial in highly layered reservoirs of varying permeability where selective production, stimulation or water shut off is required. In addition to
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the efficiency gains, the simplified well completions operations enabled by the WAI eliminated multiple operational risks associated with the cementing process in depleted and over-pressured reservoirs. “Total E&P Congo has used
innovative technologies and methods to continually improve the drilling curve on the Moho North Albian field development project,” says Ronan Bouget, the Drilling and Completions Manager. “We were early adopters of Welltec’s WAB technology. The WAI was deployed as part of the efficiency drive to reduce drilling expenditure whilst maintaining the beneficial productivity index in this field.” l
For more information visit
www.welltec.com
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