received by the International Bureau on 08 October 2019 (08.10.2019)

Claims:

1 . An anchor for use in a wellbore, comprising:

a mandrel having a plurality of radially disposed anchor ramps formed on an outer surface thereof;

a plurality of carriers radially disposed around the mandrel, the carriers each having carrier ramps radially formed on an inner surface thereof, the carrier ramps operable with the anchor ramps to extend and retract the carriers;

a plurality of pockets formed on an outer surface of each carrier; and a plurality of inserts, each insert constructed and arranged to be insertable into a pocket, each insert having a gripping formation on its outer surface.

2. The anchor of claim 1 , further including a cage surrounding the carriers and movable therewith relative to the mandrel, the cage including a plurality of openings in the area of the inserts wherein the cage, carriers and inserts are axially movable relative to the mandrel.

3. The anchor of claim 2, whereby in a first axial position of the cage relative the mandrel, the inserts are in a retracted position and in a second axial position, the carrier and anchor ramps operate to enlarge the outer diameter of the anchor.

4. The anchor of claim 1 , wherein the inserts are constructed and arranged to be movable within the pockets.

5. The anchor of claim 4, wherein movement is due to a clearance between the pocket and the insert.

6. The anchor of claim 5, wherein the clearance is a range between six hundredths of an inch and five thousandths of an inch.

7. The anchor of claim 1 , further comprising:

a fastener movably coupling the carrier and the mandrel; and wherein the carrier includes an opening, the fastener at least partially disposed in the opening and permitting the carrier to move along the mandrel.

8. The anchor of claim 1 , further comprising:

a biasing element biasing the carrier towards the retracted position; and wherein the insert includes a slot configured to receive the biasing element.

18. A method for anchoring a tool in a wellbore, comprising:

deploying the tool into the wellbore through a tubular to a first position, the tool comprising an anchor having:

a mandrel having a plurality of radially disposed anchor ramps formed on an outer surface thereof;

a plurality of carriers radially disposed around the mandrel, the carriers each having carrier ramps radially formed on an inner surface thereof, the carrier ramps operable with the anchor ramps to extend and retract the carriers;

a plurality of pockets formed on an outer surface of each carrier; and a plurality of inserts, each insert constructed and arranged to be insertable into a pocket, each insert having a gripping formation on its outer surface;

extending the carriers towards the tubular; and

moving the inserts outward relative to the carriers, thereby engaging the tubular and anchoring the tool in the wellbore.

19. The method of claim 18, further comprising:

disengaging the inserts from the tubular;

moving the tool axially in the wellbore to a second position; and thereafter; re-engaging the tubular with the inserts.

20. The method of claim 18, wherein, upon engaging the tubular with the inserts, the inserts move relative to the carrier.

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