Packer arrangement for sealingly guiding a drillstring therethrough

7:

• A packer arrangement for a sealed passage of a drillstring therethrough, the drillstring having geometric differences between passing drill pipes and joint couplings, the packer arrangement comprising:
• a packer holder which is configured to form a housing with an axially through-going center passage which comprises a flexible packer sleeve arranged in a portion thereof, the flexible packer sleeve comprising a center portion and two end terminations which are configured to be axially displaceable in the packer holder;
• an external annulus which is configured to enclose the packer holder;
• an internal annulus which is delimited by the center portion of the flexible packer sleeve and by the packer holder, the internal annulus being in a fluid communication with the external annulus;
• and
• two actuators which are configured to apply an axial tensile force to the flexible packer sleeve,
• wherein,
• each of the two end terminations is coupled to one of the two actuators, respectively.

10:

• The packer arrangement as recited in claim 9, wherein,
• the packer holder further comprises two end stops each of which have a respective end stopper surface, and stabilizer springs,
• one of the stabilizer springs is correspondingly arranged to abut between one end stopper surface in the packer holder and a side of one of the hydraulic piston rings that is opposite to a corresponding one of the two actuators, and
• each of the stabilizer springs is configured to cushion an impact of the corresponding hydraulic piston ring against the corresponding one of the two end stops.