TCP pipe lightens the load
Piping in a new way to lighten the load
Extract from Upstream published 26 January 2018 – by Russell McCulley.
A lighter, corrosion-resistant alternative to metal pipe is building a track record in the oilfield as its proponents eye the ultimate prize, a deep-water riser made entirely of composite materials
The past couple of years have witnessed a flurry of activity for the manufacturers of bonded thermoplastic composite pipe (TCP), a product that its makers say addresses many cost and safety concerns of operators.
The technology has recently been deployed in several oilfield applications following a decade of development and trials. UK-based Magma Global, which manufactures a high-end, bonded carbon composite product branded m-pipe, had a banner year, seeing its TCP light well intervention system deployed in the ultra-deepwater US Gulf of Mexico.
Magma delivered several high-sour gas TCP jumpers to Eni for use in the Adriatic Sea, supplied a number of high-sour hydrocarbon risers for onshore application in the Middle East and, early this year, announced a contract with Tullow Oil for two 2.5-kilometre, six-inch spoolable carbon composite flowlines at its Tweneboa, Enyenra and Ntomme (TEN) project off Ghana.
The company has been “building operational experience” in different applications, says Magma chief operating officer Charles Tavner, noting that m-pipe® was the first TCP product to receive third-party verification under a DNV GL recommended practice issued in 2015.
“It’s the same product every time,” Tavner says. “What we’ve done is put that same qualified product into high sour gas applications, high sour hydrocarbon applications, water injection applications and high-temperature lines.”
Bonded composite pipe resembles steel pipe in that it has a single solid wall, but unlike steel it is lightweight and mostly impervious to corrosion from seawater, hydrogen sulphide (H2S), carbon dioxide (CO2) and many harsh chemicals used in oil and gas production.
While much more expensive than steel, its advocates say it can cut costs considerably in installation and over the life of a field and offer a durable alternative to steel flexible pipe in many applications.
The TEN flowline, for example, will save Tullow 65% in installation costs immediately, Magma says, because the 100-tonne pipe and deployment package can be mounted on a small offshore construction vessel rather than a large lay ship, which would be required for an equivalent steel flexible pipe package weighing 500 tonnes.
“That’s very exciting for us. It’s a validation of what we’ve been saying for a long time, that the light weight allows you to use much smaller installation vessels. It’s great to see a customer proactively identify that and come to us and put together a package that takes advantage of it,” Tavner says.
The aerospace and automobile manufacturing industries have used thermoplastic composite materials in non-load bearing applications. Offshore has been an early proving ground for TCP use in load-bearing applications, but a conservative oil industry has been slow to embrace the technology.
Magma has formed important alliances to help push the technology along. Subsea 7 and BP have worked with Magma to qualify m-pipe for increasingly demanding subsea applications, and last year Magma reached an agreement with Odebrecht Oil & Gas (now renamed Ocyan) to supply its product for use in composite multi-bore hybrid risers in high-CO2 pre-salt projects off Brazil.
Charles Tavner said: “That’s why the m-pipe® intervention downline is exciting, because it’s effectively a small riser system. It’s only three inches inner diameter but it’s a dynamic system. By deploying it, we underpinned what the testing shows – that the product is effective in dynamic scenarios.”
A TCP riser could deliver significant savings, he says, because it would require fewer buoyancy modules and allow shorter flowlines by rendering lazy-wave systems unnecessary. Installation costs would also be much less, he adds.
“It’s always been about riser systems, because that’s really where the biggest cost benefits are.”
The corrosion-induced failure of two steel flexible gas re-injection risers last year at Petrobras’ pre-salt Lula field has lent some urgency to the quest, highlighting the potential life of field benefits of TCP. Magma reports a significant increase in interest in TCP and in the number of actual projects in the works.
Tavner says: “What has surprised me over the past few years is how there will be periods when you don’t see huge amounts of progress, and then you’ll see a number of operators move quite quickly. We seem to be in that period at the moment.”