Method and device for securing a well

1. A method for securely sluicing in a well tool in a well tubular, wherein the method comprises:

arranging a landing sleeve provided with a barrier valve sealed and anchored against and within the well tubular downstream of a subsurface safety valve;

displacing the well tool into the well tubular until a braking nose being connected to the well tool is placed in the landing sleeve;

unlocking the barrier valve by means of a key being positioned on a leading end portion of the well tool wherein the key abuts one or more first locking dogs of a plurality of latches positioned in axial openings in an axially displaceable actuating sleeve, and the key axially displaces the latches and the actuating sleeve towards the barrier valve;

axially displacing the leading end portion of the well tool past the first locking dogs by increasing the radial distance between two diametrically opposite first locking dogs such that the radial distance is larger than the diameter of the key by axially displacing the latches towards the barrier valve until the first locking dogs are displaced radially outwards into a first ring groove in the landing sleeve; and

displacing the well tool upstream past the barrier valve.

2. The method according to claim 1 , further comprising:

a method for securely sluicing out a well tool in a well tubular after the well tool has been displaced upstream past the barrier valve, wherein the method for securely sluicing out comprises:

displacing the well tool which is positioned upstream the barrier valve past the barrier valve such that it is positioned downstream the barrier valve;

locking the barrier valve by means of a shoulder on a collar of the key, the shoulder abutting one or more second locking dogs of the plurality of latches, and the key axially displacing the latches and the actuating sleeve away from the barrier valve; and

axially displacing the leading end portion of the well tool past the second locking dogs by increasing the radial distance between two diametrically opposite second locking dogs such that the radial distance is larger than the diameter of the key by axially displacing the latches away from the barrier valve until the second locking dogs are displaced radially outwards into a second ring groove in the landing sleeve.

3. A device for securing a well during sluicing in of a well tool, comprising:

a landing sleeve comprising a packer and a gripper with a barrier valve having an actuator device, wherein the landing sleeve is anchored in a well tubular on a downstream side of a subsurface safety valve; and

a braking nose releasably connected to the well tool, wherein the braking nose fits in the landing sleeve, and the well tool at its leading end portion is provided with a key fitting complementary in the actuator device in the barrier valve, wherein

the actuator device comprises a displaceable actuating sleeve,

the displaceable actuating sleeve comprises a plurality of axial openings distributed about a central axis of the landing sleeve,

the plurality of axial openings each house an axially displaceable latch comprising a first locking dog at one end of the latch facing the barrier valve and at an opposite end of the latch a second locking dog, wherein the locking dogs are interconnected by means of a spring, and

the landing sleeve comprises a first ring groove and a second ring groove, each arranged to house radially displaceable first locking dog and second locking dog, respectively, such that the radial distance between two diametrically opposite first locking dogs is larger than the diameter of the key when the first locking dogs are positioned in the first ring groove and the radial distance between two diametrically opposite first locking dogs is smaller than the diameter of the key when the first locking dogs are positioned outside the first ring groove, and such that the radial distance between two diametrically opposite second locking dogs is larger than the diameter of the key when the second locking dogs are positioned in the second ring groove and that the radial distance between two diametrically opposite first locking dogs is smaller than the diameter of the key when the second locking dogs are positioned outside the second ring groove.

4. The device according to claim 3 , characterized in that the first and second locking dogs are each provided with an axial directed protrusion.

5. A method for securely sluicing out a well tool in a well tubular, wherein the method comprises:

displacing the well tool which is positioned upstream a barrier valve past the barrier valve such that it is positioned downstream the barrier valve;

locking the barrier valve by means of a shoulder on a collar of a key, wherein the shoulder abuts one or more second locking dogs of a plurality of latches positioned in axial openings in an axially displaceable actuating sleeve, and the key axially displaces the latches and the actuating sleeve away from the barrier valve; and

axially displacing a leading end portion of the well tool past the second locking dogs by increasing the radial distance between two diametrically opposite second locking dogs such that the radial distance is larger than the diameter of the key by axially displacing the latches away from the barrier valve until the second locking dogs are displaced radially outwards into a second ring groove in the landing sleeve.