This is QI´s generic program for liquid filling annuli.
According to NORSOK D-010, “the annulus bleed system shall be liquid filled at all times if possible. When gas has been bled off from the annulus, the annulus bleed system should be replenished with liquid.”
Through annual integrity surveys on platforms, several annuli are detected to lack liquid.
This can be due to numerous field-specific issues.
In addition to annuli fluid top-up, certain annuli requires lubricate and bleed operations where gas and light annulus fluids are replaced with heavy fluids in order to maintain an adequate hydrostatic head.