Swivel and circulation control valve tool

An improved swivel and circulation control valve tool, comprising:

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