Rotatable tubing anchor

摘要

A rotatable tubing anchor for anchoring a tubing string to a casing in a well, wherein a lock pin extending radially inward from a cylindrical drag body interacts with a lazy T portion of a lock slot in a peripheral surface of a mandrel positioned in the cylindrical drag body limits vertical and rotational movement of the mandrel in relation to the cylindrical drag body in a manner that enables retaining, controlling, setting, and releasing anchor slips on the rotatable tubing anchor for lowering a tubing string equipped with the rotatable tubing anchor and a down hole pump into a well, anchoring the tubing string to casing in the well against upward tension on the tubing string while allowing rotation of the tubing string, and releasing the rotatable tubing anchor from the casing to enable pulling the tubing string, rotatable tubing anchor, and pump out of the well.

主权项

1. Rotatable tubing anchor apparatus for anchoring a tubing string to an inside surface of a casing in a well, comprising:
an anchor assembly that includes a cylindrical drag body, a plurality of drag pads that are spring biased to extend radially outward from the cylindrical drag body far enough to contact and drag against the inside surface of the casing, a lock pin that extends inwardly from the drag body, and slips that are extendable radially outward and adapted for securely anchoring the drag body to the inside surface of the casing in a settable and releasable manner; and a mandrel that is positioned in and extends through the cylindrical drag body in a manner that is vertically slidable and rotatable in relation to the drag body, said mandrel comprising a conical wedge positioned to engage with and wedge the slips radially outward in relation to the cylindrical drag body by upward movement of the mandrel in relation to the cylindrical drag body and slips and to disengage with the slips to release the slips from engagement with the casing by downward movement of the mandrel in relation to the cylindrical drag body and slips, and said mandrel also having a circumferential groove extending around the periphery of the mandrel and a lock slot connected with the circumferential groove, and the lock slot has an entrance portion connected with and extending upwardly from the circumferential groove and a lazy T portion extending laterally from the entrance portion, and further wherein the circumferential groove and the lock slot are at a depth and sized to receive the inner end of the lock pin in a slidable manner such that vertical and rotational movement of the mandrel in relation to the drag body is limited by the lock pin in the lock slot and in the circumferential groove.