Gravel packing apparatus

Claim 1

APPARATUS FOR GRAVAL PACKING A SLOTTED LINER IN THE BOREHOLE OF A WELL COMPRISING A TUBING STRING, A CROSSOVER CONNECTED IN THE TUBING STRING, SAID CROSSOVER HAVING A LOWER PORT COMMUNICATING WITH THE INTERIOR OF THE UPPER PART OF THE TUBING STRING AND AN UPPER PORT COMMUNICATING WITH THE INTERIOR OF THE LOWER PART OF THE TUBING STRING, SEALING MEANS BETWEEN THE UPPER PORT AND LOWER PORT CLOSING THE ANNULUS BETWEEN THE CROSSOVER AND THE BOREHOLE WALL, A LINER DETACHABLY SUSPENDED FROM THE LOWER END OF THE TUBING STRING, A PACKER MOUNTED ON THE OUTER SURFACE OF THE LINER NEAR THE UPPER END THEREOF AND ADAPTED TO ENGAGE THE WALL OF THE WELL TO CLOSE THE ANNULAR SPACE SURROUNDING THE LINER, A PASSAGE EXTENDING DOWNWARDLY THROUGH THE LOWER END OF THE LINER, A WASH PIPE CONNECTED TO THE LOWER END OF THE TUBING STRING EXTENDING DOWNWARDLY THROUGH THE LINER AND COMMUNICATING WITH THE PASSAGE, AN INLET IN THE WASH PIPE FROM THE SPACE WITHIN THE LINER INTO THE WASH PIPE, AND A CHECK VALVE ADAPTED TO ALLOW FLOW THROUGH THE INLET INTO THE WASH PIPE AND PREVENT FLOW FROM THE WASH PIPE THROUGH THE INLET.