Встречается в следующем контексте
It should be noted when calculating the value of each extension that it is necessary to account for both rig specific auxiliary services (e.g. rental of additional equipment for use on that rig, diesel consumption etc.) and a proportion of the shared services – which largely relate to the costs associated with the shared drilling camp. The shared services cost is dependant upon the number of rigs on hire and the level of third party service company activity.

Заранее спасибо

Доля(степень) участия сторонней компании(третьей стороны)в обслуживании