Retrievable bridge plug

Claim 1

A RETRIEVABLE BRIDGE PLUG COMPRISING: (C) A VERTICALLY ELONGATED BODY ADAPTED TO BE RUN IN AND RETRIEVED FROM A WELL CASING; (B) CASING WALL-ENGAGING FRICTION MEANS LONGITUDINALLY SLIDABLE ON SAID BODY; (C) CASING WALL-ENGAGING ANCHOR MEANS CARRIED BY AND POSITIONED BELOW SAID FRICTION MEANS AND SLIDABLE WITH SAID FRICTION MEANS LONGITUDINALLY ON SAID BODY, SAID ANCHOR MEANS INCLUDING A FIRST SET OF WICKERED SECTIONS MOVABLE OUTWARDLY TO GRIP THE CASING WALL TO RESIST UPWARD MOVEMENT AND A SECOND SET OF WICKERED SECTIONS MOVABLE OUTWARDLY TO GRIP THE CASING WALL TO RESIST DOWNWARDLY MOVEMENT, WHEREBY, UPON LOWERING THE PLUG INTO THE CASING, SAID FIRST AND SECOND SETS OF WICKERED SECTIONS WILL ENTER THE CASING AHEAD OF SAID FRICTION MEANS; (D) A DOUBLE CONE EXPANDER MEMBER CARRIER BY SAID BODY AND ADAPTED UPON RELATIVE LONGITUDINAL MOVEMENT OF SAID BODY WITH RESPECT TO SAID WICKERED SECTIONS TO SELECTIVELY ENGAGE AND MOVE SAID FIRST SET OF WICKERED SECTIONS AND SAID SECOND SET OF WICKERED SECTIONS OUTWARDLY INTO GRIPPING ENGAGEMENT WITH THE CASING WALL; (E) CASING WALL-ENGAGING PACKING MEANS CARRIED BY SAID BODY AND ADAPTED TO SEAL FLUID ABOVE AND BELOW THE PLUG AND TO MOVE SAID BODY LONGITUDINALLY IN THE CASING IN RESPONSE TO FLUID PRESSURE ABOVE AND BELOW THE PLUG, WHILE SAID FRICTION MEANS AND SAID ANCHOR MEANS REMAIN STATIONARY IN THE CASING, TO ENGAGE SAID EXPANDER MEANS WITH ONE OF SAID SETS OF WICKERED SECTIONS AND MOVE THE LATTER OUTWARDLY INTO GRIPPING ENGAGEMENT WITH THE CASING WALL; (F) MEANS INCLUDING A LOST-MOTION DEVICE COUPLING SAID BODY TO SAID FRICTION MEANS FOR SIMULTANEOUSLY MOVING SAID BODY, SAID FRICTION MEANS AND SAID ANCHOR MEANS IN BOTH LONGITUDINAL DIRECTIONS THROUGH SAID CASING WITH SAID EXPANDER MEMBER DISENGAGED FROM SAID WICKERED SECTIONS, AND FOR ALLOWING MOVEMENT OF SAID BODY RELATIVE TO SAID FRICTION MEANS AND SAID ANCHOR MEANS WHEREBY SAID EXPANDER MEMBER CAN ENGAGE ONE OF SAID SETS OF WICKERED SECTIONS AND MOVE THE SAME INTO GRIPPING ENGAGEMENT WITH THE CASING WALL TO ANCHOR SAID BODY IN THE CASING; AND (G) MEANS INCLUDING VALVE MEANS FOR CONTROLLING THE FLOW OF FLUID THROUGH SAID BODY TO BY-PASS SAID PACKER MEANS AS THE PLUG IS RUN IN AND RETRIEVED FROM THE CASING.