Well suspension is the wellhead sealing for a particular period of time in order to save the wellbore during the drilling process or after the end of it. Well conservation is performed for a short period of time (several months) during the process of drilling: in case of appearance in the subsurface of complicating mining-and-geological conditions, in case of well pad drilling ‚Äď until the end of construction of all wells in the pad, in case of the field development ‚Äď until the end of the field infrastructure development, or for a long term after the field development.

In order to save a drilled wellbore, separate well intervals formed by unstable rocks are secured for the period of conservation by a cement slurry (cement plugs) or by another binding material (for instance, by resins). These intervals are drilled through in case of well operations resuming. In case of well conservation for a long period, the X-mas tree is coated by the anticorrosion coating.