.... Challenging accepted field practice, required multiple gated approval processes before finally obtaining approval to proceed with the subsea intervention to restore productivity. Consequently, extensive carbonate scale was removed from high up in the tubing through to the reservoir section in the biggest...

... and a safety risk as the scale precipitated deeper and thereby reached the downhole safety valve (DHSV) location at 517 m TVD. In January 2021 this safety critical valve failed during periodic testing due to inorganic precipitation fouling of the valve. The last scale removal intervention was performed only 5...

... production compared to oil rates prior to the intervention. This paper presents the difficulties associated with delivering these multistage treatments and the applied engineering solutions that enabled effective placement of both the scale dissolver and scale squeeze in this subsea well. In addition...

... Field development team initiates all the intervention process [ Fig-1 ]. Based on the field development well review process, this well was planned for Production Log. As per KOC procedure, a tubing check was carried out to inspect the condition of the tubing before the Production Log. The tubing...

... or when the associated economic impact of chemical intervention is large ( e.g. subsea completed wells with poor chemical placement by bullhead treatments, or limited access to wet subsea wellheads), other methods of scale control such as sulfate removal must be considered during the front end...

... the associated economic impact of chemical intervention is large ( e.g. subsea completed wells with poor chemical placement by bullhead treatments, or limited access to wet subsea wellheads), other methods of scale control such as sulphate removal must be considered during the front end engineering design (FEED...

... of the scaling potential and also the potential difficulty in being able to effectively treat the wells in the absence of coil tubing interventions. This option would therefore carry a high degree of risk associated with the requirement for effective placement by bullhead treatments 2 , 9 . Indeed...