Anchor system, method, and borehole system
An anchor system, including a mandrel, a cone disposed upon the mandrel, a slip disposed upon the mandrel and adjacent the cone, and a retainer interactive with the cone, the slip and the mandrel to initially prevent the slip from climbing the cone. A method for operating an anchor system including passing a load through a slip, a retainer in contact with the slip and a cone in contact with the retainer while preventing relative movement between the skip and the cone, moving the slip, retainer, and cone relative to a mandrel having a recess, locating the retainer radially outwardly of the recess, urging the retainer into the recess with the slip and the cone. A borehole system including a borehole in a subsurface formation, a string in the borehole, and an anchor system disposed within or as a part of the string.
1 . An anchor system, comprising:
a mandrel having a radially outward surface and a recess in the radially outward surface;
a cone disposed upon the mandrel;
a slip disposed upon the mandrel and adjacent the cone; and
a retainer initially in direct contact with the cone and the slip, the retainer being radially inwardly disposed of the slip and inaccessible from radially outwardly of the slip when in the initial position, the retainer being axially adjacent one end of the cone, the retainer initially positioned on the radially outward surface of the mandrel to initially prevent the slip from climbing the cone and only during deployment the retainer being received in the recess.
2 . The system as claimed in claim 1 , wherein the mandrel further includes a recess therein, the recess receptive of at least a portion of the retainer.
3 . The system as claimed in claim 1 , wherein the recess is receptive of the radial thickness of the retainer.
4 . The system as claimed in claim 1 , wherein the cone includes a stop, initially in contact with the retainer.
5 . The system as claimed in claim 4 , wherein the stop is angled with an acute angle toward a surface of the mandrel.
6 . The system as claimed in claim 1 , wherein the slip includes a shoulder initially in contact with the retainer.
7 . The system as claimed in claim 6 , wherein the shoulder is angled with an acute angle toward a surface of the mandrel.
8 . The system as claimed in claim 1 , wherein the retainer includes chamfers.
9 . The system as claimed in claim 1 , wherein the retainer is radially responsive to load placed thereupon by a shoulder of the slip and a stop of the cone when the retainer is located radially outwardly and in line with a recess in the mandrel.
10 . The system as claimed in claim 9 , wherein the shoulder is a part of a groove in the slip.
11 . A method for operating an anchor system comprising;
passing a load through a) a slip having a shoulder, b) a retainer in contact with the slip shoulder, and c) a cone having a stop that is in contact with the retainer, the retainer preventing relative movement between the slip and the cone;
moving the slip, retainer, and cone together relative to a mandrel having a recess, until the retainer is positioned radially outwardly of the recess in the mandrel;
reducing a distance between the slip shoulder and the cone stop and simultaneously forcing the retainer into the recess; and
radially outwardly displacing the slip on the cone.
12 . The method as claimed in claim 11 , wherein the moving is by a stroke length of another tool associated with the anchor system.
13 . The method as claimed in claim 11 , wherein the forcing is by pinching the retainer between the cone and the slip.
14 . A borehole system comprising:
a borehole in a subsurface formation;
a string in the borehole; and
an anchor system as claimed in claim 1 disposed within or as a part of the string.