Well packing apparatus

Claim 1

A WELL PACKER SIZED AND ADAPTED FOR RECEPTION IN A WELL BORE FOR PACKING-OFF THE WELL BORE COMPRISING: AN OUTER TUBULAR MEMBER; A BODY MEMBER TELESCOPICALLY ARRANGED AND SLIDABLY DISPOSED WITHIN SAID OUTER MEMBER AND OPERATIVELY ARRANGED TO SHIFT LONGITUDINALLY RELATIVE THERETO IN RESPONSE TO A DIFFERENTIAL OF FLUID PRESSURE ABOVE AND BELOW SAID MEMBERS IN A WELL BORE; FIRST AND SECOND ANNULAR ELASTOMERIC PACKER CUPS MOUNTED AROUND ONE OF SAID MEMBERS AND HAVING THEIR ENLARGED PORTIONS FACING IN OPPOSITE DIRECTIONS AND THEIR REDUCED PORTIONS ADJACENT ONE ANOTHER; VALVE MEANS RESPONSIVE TO SHIFTING OF SAID BODY MEMBER FOR SELECTIVELY PROVIDING FLUID COMMUNICATION ACROSS SAID PACKER CUPS BETWEEN SAID OPPOSITELY FACING PORTIONS AND SAID REDUCED PORTIONS WHENEVER SAID BODY MEMBER IS IN ONE POSITION RELATIVE TO SAID OUTER MEMBER AND BLOCKING THIS FLUID COMMUNICATION WHENEVER SAID BODY MEMBER SHIFTS LONGITUDINALLY TO ANOTHER POSITION RELATIVE TO SAID OUTER MEMBER; ANCHORING MEANS FOR SECURING SAID PACKER AGAINST MOVEMENT RELATIVE TO THE WELL BORE INCLUDING OUTWARDLY-EXTENDIBLE WALL-ENGAGING MEANS MOUNTED ON SAID OUTER MEMBER AND FLUIDLY SEALED RELATIVE THERETO TO PROVIDE A FLUID-TIGHT SPACE THEREBETWEEN, SAID WALL-ENGAGING MEANS BEING ADAPTED FOR EXTENSION INTO ENGAGEMENT WITH THE WELL BORE UPON APPLICATION OF HYDRAULIC PRESSURE IN SAID FLUID-TIGHT SPACE; AND HYDRAULIC MEANS RESPONSIVE TO SHIFTING OF SAID BODY MEMBER FROM SAID ONE POSITION FOR APPLYING A HYDRAULIC PRESSURE IN SAID FLUIDTIGHT SPACE TO PRESS SAID WALL-ENGAGING MEANS INTO ANCHORING ENGAGEMENT WITH A FORCE PROPORTIONATELY RELATED TO SAID PRESSURE DIFFERENTIAL.