Notices served

Notice 315351756 served against Eni UK Limited on 30/09/2025
Notice Type	Improvement Notice
Description	You failed to give effect to arrangements for the effective planning, organisation, control, monitoring and review of the preventive and protective measure for the decommissioning activities of the Little Dotty Well 48/30-09 from the Valaris 72 jack-up drilling rig, resulting in failure of the landing string crossover, a release of approximately 480kg of gas, and open communication between the reservoir and the environment for approximately 18 days, in that you did not: • Eliminate risks through the design of the crossover, in that you attempted to reverse engineer a crossover piece between the landing string and wellhead instead of using an Original Equipment Manufacturer’s supplied crossover. The thread run on the reverse engineered crossover was a standard 1” stub ACME opposed to the Cameron Ironworks proprietary thread specified in the Rig Book for the Little Dotty Xmas Tree, which contributed to the landing string stalling during installation without being fully engaged • Provide instructions that sufficiently highlighted critical tasks based on available relevant information included sufficient verification checks that those critical tasks had been successfully completed, or gave sufficient direction for the installation of the 9-5/8” landing string if critical task steps were not successfully completed. • Conduct an investigation that sufficiently considered all the causes of the incident, including both technical factors related of the design of the reverse engineered crossover piece and non-technical factors such as decision making of those involved, the quality and adequacy of written instructions and the quality of record keeping related to the work activity being undertaken.
Compliance Date	28/11/2025	Revised Compliance Date
Result	Complied with
Breaches involved in this Notice

Location of Offence
Address	HQ/Ebury Bridge Road/ENI UK Lt E N I UK E N I House 10 Ebury Bridge Road LONDON SW1W 8PZ England	Region	London
		Local Authority	City of Westminster
		Industry	Extractive and utility supply industries
		Main Activity	06100 - EXTRACTION OF CRUDE PETROLEUM
		Type of Location	Fixed
HSE Details
HSE Group	EDU2OFF	HSE Directorate	Energy Division
HSE Area		HSE Division	London