May 15 2018
Case Study: Slick-O-Line distributed fibre optic service - Delivering Outstanding Leak Investigation Services
A UKCS operator observed sustained pressure build up on a wells A-annulus building at a rate of less than 10 psi/day. They needed to determine the potential source
of the pressure to help plan the plug and abandonment of the well.
Traditional leak detection services had been unable to determine the source of the pressure. The very low charge rate and multiple strings of tubing and
casing had made leak identification using conventional methods extremely challenging.
A retro-fit Slick-O-LineTM package was mobilised to the platform to perform a Slick-O-LineTM fibre optic survey.
The Paradigm Slick-O-LineTM service had been chosen due to its small portable footprint, quick turnaround
time and ability to find potential leak paths through multiple casing strings or cement sheaths.
• Fluid movement velocity and direction were identified through multiple casing strings over a
specific interval in the well indicating the origin of the pressure.
• It took 13 hours from Slick-O-LineTM rig-up to rigdown including 5 hours of survey time.
• Data was processed and interpreted within 3 days of acquisition.
• Regular pressure control equipment and procedures were applied saving time and cost.
• In addition to the Temperature and Acoustic fibre survey memory GR, temperature and pressure data
were also gathered providing a more comprehensive surveillance package in the well.