As the North Sea is set to experience a wave of well abandonments over the next 10-20 years, it is important for operators to find cost effective and reliable solutions to abandon wells and decommission their assets. The North Sea already has a strong heritage of successful abandonments and decommissioning campaigns to draw experience from - as these four case studies from Claxton’s work in the region demonstrate.
The Claxton SABRE™ abrasive cutting system is capable of simultaneously severing all the casings in a well, regardless of casing loading, eccentricity or contents.
The complete decommissioning of the North Sea Camelot fields including the removal of Camelot Alpha began in 2012. Initially the plugging and abandonment of the fields' six platform wells was completed and was followed by the severance of the well casings 5 metres below the seabed.
Claxton used its SABRE™ internal abrasive cutting system to sever all casings within the Alpha wells simultaneously, regardless of the loading on the casings or any eccentricity.
The system uses a mixture of air, water and abrasive garnet at up to 1000 bar to cut through the steel casings and any cement within the annuli.
SABRE™ has been used successfully on over 75 campaigns and provides operators with a fully robust option to severe multi-string casings internally – with the added benefit of finite control of the elevation of the cut.