March 2, 2020

by Annabel Green, CTO, Tendeka

Published in Energy Voice, March 2020


Through all the buzzwords and jargon, we all recognise the value that the widespread adoption and effective application of digital technology will have in the upstream oil and gas sector. It will make our industry leaner, greener, safer and more efficient.

I’m excited by the potential of technology to more effectively recover hydrocarbons: leaving unwanted fluids in the ground, increasing operating efficiencies, and reducing the number of wells required.

To do this, the systems we deploy must include components within the wellbore, providing data, communications and control. For this to work effectively we may need to change the way we think about the wells themselves.

We often cite examples of consumer electronics to provide an illustration of the pace of technology development. If we look back 15 years, not excessive for a well life, we would have iPods not smart phones, modems not broadband, and CRTs (Google it) not LCD TVs. While it’s fun to amuse young people with tales of life before smart phones and Wikipedia, the fundamental difference is that once obsolete, we simply throw these devices away and get a new one. A luxury we don’t have in our industry.

A more relevant analogy may be found further down the digital chain, in the world of satellite systems. The geosynchronous orbit satellites used in telecommunications have a typical working life of 15 years with a high initial capital cost of around $50 million for the satellite and a launch cost of $50 to $400 million. Do you see where I’m going here?

The satellite industry is rapidly changing with advancements in computing technology. This is enabling significant downsizing for cost reduction and distributed system capability, the introduction of flexible, deterministic software for more efficient operations and increasing functionality. These advances are leading to a rapid growth in deployment that looks set to change our ability to explore space and communicate across the globe.

However, the industry is also focused on managing and supporting its legacy systems. There are reports of heritage components being brought back into manufacture to support these systems with the associated challenges of their reintroduction, and of personnel being brought out of retirement as key competencies are lost.

It is lifetime limits of the satellites themselves that drive the capital expenditure cycles of satellite operators. The ‘Holy Grail’ for operators of these legacy systems is to be able to refuel, repair and replace components in orbit to extend the satellite’s life. Trials are currently ongoing with robotic repair systems and drone technology development to allow just that.

If we now draw parallels between satellites and well technology, system cost reductions with distributed system capability, more efficient operations and increased functionality are also key to digital technology achieving its potential in reservoir management. But perhaps our ‘Holy Grail’ would instead be well technology that can readily interface with new or legacy systems, that can be simply replaced if damaged, at the end of its service life, or simply to be upgraded.

We are working towards this in today’s technology developments. We must, however, also change the way we think about wells from an initial capital expense to a dynamic environment which can be adapted to the rapid changes our industry will undergo over the next decade or so.

Digital revolution - satellite in orbit


February 20, 2020

Tendeka’s Finalist Spotlight as published by Offshore Achievements Awards

Tendeka has bagged two Offshore Achievement Awards in past years. But will 2020 make it a hat trick? We spoke to Eilidh McKay, Technical Support Manager, about how it feels to be nominated for Emerging Technology.

“It is a real honour for Filtrex to be nominated. This is a great example of teamwork within Tendeka and to win would be such a reward for everyone who has been involved. Personally, it has been fantastic to be a part of this project and work with so many team members, all looking at different aspects of the tool with the same end goal – to provide a game-changing tool to the market.”

We really looked outside the box in developing Filtrex.

“Yes, we took a fresh look at an inherent problem in the industry, and researched technology used in other industries. Our engineers studied the problems of Christmas tree transportation and excessive liquid movement in superbike fuel tanks to develop the remedial sand control solution offered by Filtrex.”

Filtrex is a great addition to our already extensive portfolio of products.

“Filtrex is a bespoke system designed exclusively for remedial sand control via thru tubing operations. The system is not limited by the problems of deploying through narrow completion profiles whilst still providing conformance in large casing/liner sizes.”

The black tie ceremony will take place on Thursday 19 March 2020 at P&J Live, Aberdeen.

For more information on Filtrex, read Eilidh’s technical article or visit our Filtrex page.


OAA Finalist Spotlight for Filtrex Thru-Tubing Sand Control


February 18, 2020

Press release

Independent global completions service specialists Tendeka has worked with design engineering and manufacturing company Wellvene to create and qualify a new version of its swellable sealing solution, SwellStack.

The introduction of the enhanced Tendeka/Wellvene SwellStack provides a cost-effective sealing solution that is compatible with all Wellvene and original equipment manufacturer (OEM) insert safety valves.

The use of the patented technology ensures production can be reinstated to wells that are closed in due to the failed sealing of an insert safety valve, thereby eliminating any requirement to consider higher cost and long lead straddles or potential workovers.

Downhole safety valve seal bores can become corroded or damaged due to intervention activity such as wireline. Standard chevron stacks commonly provided for insert safety valves may be unable to effectively seal within such damaged bores. This results in a leak path for hydrocarbons to migrate up the control line.  In such cases the only solution is to perform a straddle installation or workover the upper completion and replace the damaged valve. Both options are costly and time consuming.

Originally launched by Tendeka in 2013, the SwellStack has been utilised in more than 180 installations globally prior to the release of the next generation design. Comprising of swellable O-ring technology and a bespoke chevron seal design, the swellable O-ring expansion within the damaged bore activates the chevron seals to both effectively and reliably provide integrity for up to 10,000psi in liquid and gas.

Gillian King, Tendeka’s VP for Europe, Russia, CIS & Africa said: “Our partnership with Wellvene to develop this new, improved SwellStack brings a superior design to our clients for their mature fields. We have a proven track record using our SwellStack solution to bring shut-in wells back on-line, adding significant value to global operators whilst maximising economic recovery.”

Bronson Larkins, Managing Director at Wellvene added: “Combining Tendeka’s patented swellable technology with our expertise in providing downhole safety valve solutions, has delivered a redesigned, re-qualified, and enhanced wireline retrievable downhole safety valve sealing solution.

“With ageing well stock and high potential for damaged seal bores, I understand the challenges our customers are faced with regarding sealing integrity during safety valve operations.  The newly improved and qualified version of the Swellstack shall provide greater integrity and operational efficiencies within the well intervention and integrity industry.”

SwellStack incorporates the knowledge gained from standard Tendeka swellable compounds which have been used in over 65,000 successful installations worldwide. Tendeka’s Swellable O-rings have been used since 2011, with more than 11,200 O-rings supplied globally to date. All O-rings are manufactured from an oil or water swellable compound, designed to swell when in contact with control line fluid or produced well fluids.


For more information please contact: or visit our SwellStack page.

Pictured: Wellvene’s Bronson Larkins with Gillian King of Tendeka 

Wellvene’s Bronson Larkins with Gillian King of Tendeka


February 7, 2020

Tendeka’s BDM for Sub-Saharan Africa Phil Stone welcomed a delegation from the Petroleum Authority of Uganda (PAU) to our Aberdeen HQ this week.

The PAU delegation, led by Executive Director Ernest Rubondo, was in Aberdeen to meet with the UK Oil and Gas Authority (OGA) and learn from their best practice to safeguard production and ultimate recovery. The Ugandan authority also arranged the Tendeka visit as part of engaging with technology and service providers.

Phil was delighted to host the group, saying: “It’s really pleasing to be given the opportunity to meet and share ideas with such esteemed visitors. We are delighted that the expertise and services Tendeka offers are being considered at such an early stage in the development of Uganda’s oil and gas industry.”


Pictured From left to right: Moses Ekunu, Gloria Sebikari, PAU Executive Director Ernest Rubondo, Phil Stone, Denis Ariko, Angela Nalweyiso Semakula, Dr Joseph Kobusheshe, Felix Bob Ocitti

Petroleum Authority of Uganda delegation outside Tendeka Vanguard House