Keynote Address: Dr. Salima Baraka-Lokmane
Production of extreme-HPHT formation water in the North Sea fields has created unprecedented scaling challenges. A good producer well has been shut-in since 2011 due to exotic sulphide scaling rendering the subsurface safety valve inoperable. Commercially available scale inhibitors have proven incapable of performing under the harsh conditions of the reservoirs: high temperature (200-225 °C), high pressure (1,100 barg) and high salinity (>250 g/L Total Dissolved Solids). It was therefore crucial to pioneer novel chemical treatments. An important R&D program was launched to understand the mechanisms of sulphide scale formation and to develop new scale inhibitors effective for these scales in extreme-HPHT conditions. A novel sulphide nanoparticle scale inhibitor was developed to inhibit zinc and lead sulphide scales and remain stable under the harsh conditions of CGA reservoirs. The new chemical was qualified in France and Scotland using state-of-the-art test methodologies.
Keynote Address: Dr. Matteo Martini
Time-resolved fluorescence (TRF) technique has been applied for the quantification of both scale and corrosion inhibitors in Elgin and Perpetua brine production waters. Revealing solution containing Eu3+ and Tb3+ ions has been added to the test sample and analysed by portable field TRF detector (INIBOX). The specific interaction between lanthanide ions and chelating species of inhibitors gives a TRF signal proportional to the concentration of additives. Double quantification of scale-scale or scale-corrosion inhibitors in brine producing waters were studied and data reported. The 2-minute measurements as well the sub-ppm sensitivity of technique open perspectives for any further real-time online chemicals management in offshore facilities.