Apparatus to prevent fouling of wire

Claim 1

FOR USE IN A WELL INSTALLATION WHEREIN A WELL TOOL IS PUMPED THROUGH A FLOW TUBING AT THE END OF A WIRE LINE FOR RUNNING INTO AND RETRIEVAL FROM AN OPERATING LOCATION IN A WELL, THE COMBINATION COMPRISING: FIRST OUTER AND SECOND INNER INTERCONNECTED TELESCOPING MEMBERS RESPECTIVELY ADAPTED TO BE CONNECTED TO THE TOOL AND TO THE WIRE LINE, SAID TELESCOPING MEMBERS BEING CONSTRUCTED AND ARRANGED FOR RELATIVE MOVEMENT BETWEEN A MOST TELESCOPED POSITION AND A LEAST TELESCOPED POSITION, SAID FIRST TELESCOPING MEMBER INCLUDING A CHAMBER THROUGH WHICH SAID SECOND MEMBER EXTENDS; PASSAGEWAY MEANS IN SAID TELESCOPING MEMBERS ADAPTED TO HYDRAULICALLY INTERCONNECT SAID CHAMBER AND THE DOWNHOLE PORTION OF THE FLOW TUBING WHEN SAID TELESCOPING MEMBERS ARE IN THE MOST TELESCOPED POSITION THEREOF, AND TO INTERCONNECT SAID CHAMBER AND THE UPPER PORTION OF THE FLOW TUBING WHEN SAID TELESCOPING MEMBERS ARE IN A LESSER TELESCOPED POSITION THEREOF; ANNULAR SEALING MEANS ON SAID FIRST TELESCOPING MEMBER ADAPTED TO SEALINGLY ENGAGE THE INNER WALL OF THE FLOW TUBING; AND MEANS EXTENDING FROM SAID CHAMBER THROUGH SAID FIRST TELESCOPING MEMBER ADAPTED TO ENGAGE THE WALLS OF THE FLOW TUBING TO OPPOSE MOVEMENT OF SAID TELESCOPING MEMBERS THERETHROUGH WHEN THE PRESSURE DIFFERENTIAL BETWEEN THE CHAMBER AND THE EXTERIOR OF SAID FIRST TELESCOPING MEMBER ON THE UPHOLE SIDE OF SAID SEALING MEANS EXCEEDS A PREDETERMINED PRESSURE.