The aim of abandonment is to safely and economically remove the installed facilities at the end of field producing life, in order to comply with national laws, international conventions and company policy. The key stages include: deciding when to cease production which is based on economic limits with the help of the reservoir model and as agreed by government and partners, plugging of wells, removal of well equipment, production tanks and associated installations; and surface remediation. Regulations regarding abandonment deal with both the removal of installations (primarily concerned with safely of navigation and other users of the sea) and disposal (primarily aimed at pollution prevention).