公开(公告)号：US3926409A

公开(公告)日：1975-12-16

申请号：US45223474

申请日：1974-03-18

Applicant: DRESSER IND

Inventor： ABNEY DAVE L ,  WILLIAMS ROBERT C ,  GILBERT HORACE E

IPC: E21B33/12 ,  E21B34/12 ,  E21B43/04 ,  F16K31/44

CPC classification number: E21B33/12 ,  E21B34/12 ,  E21B43/045

Abstract: The apparatus and method provides the ability to selectively treat a producing zone in a well and to gravel pack an annulus in the well casing outside a screen type liner pipe. A tubing string extending from the surface of the well bore is connected to a packer by a crossover valve. Flow down the tubing string is directed to an annulus below the packer, then inwardly through the screen type liner, then upward through the crossover into the annulus above the packer and then to the earth''s surface. Communication from the crossover to the annulus above the packer may be selectively closed to permit a treating pressure to be exerted down the tubing to force a treating fluid into the producing zone. The treating pressure is isolated from the casing above the packer to protect the casing above the packer.