Swivel and circulation control valve tool

Abstract

A swivel and circulation control valve tool includes an upper mandrel housing telescopingly connected on a telescope rod axially fixed in a lower mandrel housing, all having a through central bore. The telescope rod is provided with axially directed radial spline lugs arranged for, in a first, non-collapsed position, engaging with corresponding axially inwardly directed splines in the upper mandrel housing, for torque transfer to the lower mandrel housing, the spline lugs arranged for, in a second, collapsed position, releasing from the splines for allowing swiveling rotation of the upper mandrel housing about and relative to the telescoping rod and the lower mandrel housing, a lateral circulation port in the upper mandrel housing arranged for opening by aligning with a mandrel port in the telescope rod in the second, collapsed position, and for closing in the first, non-collapsed position, a releasable hydraulic lock arranged for locking the telescope rod in either the second, collapsed position, or the first, extended position. The hydraulic lock includes a piston arranged in an annular, liquid-filled cylinder chamber in the upper mandrel housing and fixed on the telescope rod, the piston having oppositely directed first and a second relief valves, each arranged for opening at predefined pressure differentials.