Duoline® Technologies discusses why CBRs for oilfield tubular internal lining systems are essential to reduce risk of failure.
Fiberglass liners in downhole tubing have been used since the early 1970s. The technology was initially driven by the challenge of ensuring a longer lifetime of the tubing in injection wells. Glass reinforced epoxy lining systems are made up of long, thin-walled glass fiber epoxy liner that is used as a corrosion resistant alternative for fluid transport – especially in applications where there is a presence of H2S, CO2, dissolved oxygen, brinish disposal water, highly acidic soil conditions and more.
A completely corrosion-resistant tubing system
Whilst liners protect most of the piping surface area from corrosion, it is critical to complete this protection at the vulnerable connection areas with a reinforced elastomeric corrosion barrier ring (CBR) for a completely corrosion-resistant tubing system.
When a trained workforce properly installs a lining system with CBRs, a fiberglass-lined pipe can last more than 20 years in the field without liner collapse and corrosion damage to the interior pipe. It is in the best interest of all parties involved with installation to ensure that the CBR is the best available product with a history of reliable performance and that proper installation procedures are followed to prevent product failure.
Accurate installation of CBRs is critical for the success of oilfield tubulars
CBRs should be compressed between the flares, located on each liner end, during the connection make up process in order to protect couplings, which are highly susceptible to corrosion damage. In order to protect CBRs and ensure that they are in proper compression during installation, reference bands should be marked on the pin ends to indicate the initial CBR contact and compression levels. Users have found that installation goes faster and smoother when the tubing arrives from the lining facility with the reference bands in place. In addition, it is important to use a stabbing guide to make certain that the tubulars do not clash together and cause damage that would compromise the protection provided by flares. Utilising a stabbing guide reduces the chance of damage to the corrosion barrier at connection areas.
Adapted from press release by Cecilia Rehn