Pressure operated circulation valve

Claim 2

A circulating valve for use in a tubing string in a well bore traversing earth formations where the annulus between the tubing string and the well bore contains a liquid, said circulating valve including a tubular mandrel assembly having an annular recess; a tubular sleeve assembly slidably mounted in said annular recess, said sleeve assembly including first and second sleeve member; a circulating port in said tubular mandrel assembly intermediate of the length of said annular recess; said sleeve members having overlapped portions and seal means cooperating with said sleeve member and said mandrel assembly for defining an annular chamber in fluid communication with said circulating port in a first position on said mandrel assembly, said sleeve members being independently movable longitudinally of said mandrel assembly; first and second release means for respectively releasably connecting said first sleeve member and said second sleeve member to said tubular assembly and for releasably maintaining said annular chamber in fluid communication with said port in said first position; one of said sleeve members being responsive to a pressure applied in said annular chamber for releasing one of said first and second releasable means so that said one sleeve member moves longitudinally to a second position for placing the interior of said tubular mandrel assembly in fluid communication through said port with the exterior about said sleeve members; means forming an effective pressure area on said one sleeve member and including a tubular valve seat located in the one sleeve member below said circulating port in said second position of said one sleeve member and where said valve seat and said one member are adapted to receive a sealing member so that said other sleeve member can be moved longitudinally in response to pressure to said second position for closing said circulation port; and means cooperating with said other of said first and second sleeve members and said tubular assembly for locking said other sleeve member in said second position.

Claim 3

The apparatus as set forth in claim 1 wherein said sleeve members are normally in an upper location in said annular recess and said one sleeve member has a sleeve member port along its length so that when said one sleeve member moves longitudinally to said second position said sleeve member port in said one sleeve member aligns with the port in said tubular assembly, said one sleeve member being arranged to abut the lower end of the annular recess in said second position.

Claim 4

A circulating valve for use in a tubing string in a well bore traversing earth formations where the annulus between the tubing string and the well bore contains a liquid, said circulating valve including, a tubular mandrel having an annular recess defined by upper and lower end surfaces; an upper port in said mandrel adjacent to said upper end surface, a lower port in said mandrel adjacent to said lower end surface and a circulation port in said mandrel intermediate of said upper and lower ports., first and second sleeve members disposed in said annular recess and having overlapped portions, first seal means for sealing off said first sleeve member with respect to said upper port; second seal means for sealing off said overlapped portions and said second sleeve member with respect to said circulation port; third seal means for sealing off said second sleeve member with respect to said lower port; said first sleeve member having equal effective pressure areas between said upper port and said circulation port; said second sleeve member having equal effective pressure areas between said circulation port and said lower port; first releasable means for releasably connecting said first sleeve member to said tubular mandrel; second releasable means for releasably connecting said second sleeve member to said tubular mandrel; first tubular seat means releasably connected in said mandrel between said upper port and said circulating port; second tubular seat means releasably connected in said mandrel between said circulating port and said lower port; said first seat means having a larger bore than the bore of the second seat means so that said first seat means can receive a first sealing member and thereby permit fluid pressure to be applied through said circulatory port to said second sleeve member and release said second releasable means to shift said second sleeve member to a location to disconnect said overlapped portions; said second seat means being sized to receive a second sealing member and thereby permit fluid pressure to be applied through said upper port and release said first releasable means to shift said first sleeve member toward said second sleeve member and rejoin said overlapped portions.

Claim 5

A circulating valve for use in a tubing string in a well bore traversing earth formations where the annulus between the tubing string and the well bore contains a liquid, said circulating valve including, a tubular mandrel having an annular recess defined by upper and lower end surfaces; an upper port in said mandrel adjacent to said upper end surface, a lower port in said mandrel adjacent to said lower end surface and a circulation port in said mandrel intermediate of said upper and lower ports., first and second sleeve members disposed in said annular recess and having overlapped portions, first seal means for sealing off said first sleeve member with respect to said upper port; second seal means for sealing off said overlapped portions and said second sleeve member with respect to said circulation port; third seal means for sealing off said second sleeve member with respect to said lower port; said first sleeve member having equal effective pressure areas between said upper port and said circulation port; said second sleeve member having equal effective pressure areas between said circulation port and said lower port; first releasable means for releasably connecting said first sleeve member to said tubular mandrel; second releasable means for releasably connecting said second sleeve member to said tubular mandrel; first tubular seat means releasably connected in said mandrel between said upper port and said circulating port; second tubular seat means releasably connected in said mandrel between said circulating port and said lower port; said first seat means having a larger bore than the bore of the second seat means so that said first seat means can receive a first sealing member and thereby permit fluid pressure to be applied through said circulatory port to said second sleeve member and release said second releasable means to shift said second sleeve member to a location to disconnect said overlapped portions; said second seat means being sized to receive a second sealing member and thereby permit fluid pressure to be applied through said upper port and release said first releasable means to shift said first sleeve member toward said second sleeve member and rejoin said overlapped portions.

Claim 6

The apparatus as set forth in claim 3 and further including locking means for retaining said first sleeve member in position after the overlapper portions are rejoined.