Downhole pump filter

Claim 2

For use in filtering sand and other solid particles from well fluids prior to passage of the fluids through a pump intake nut of a well pump, the combination with the pump intake nut of a mandrel having a hollow chamber therethrough and a plurality of perforations through at least the lower portion of the walls thereof for filtering smaller undesirable particles from well fluids flowing into said mandrel, a casing snugly slidable over said mandrel having a closed lower end and a plurality of perforations through at least the lower portion of the walls thereof for filtering large undesirable particles from well fluids flowing into said casing and coupling means for detachably securing an upper end of said casing relation to an upper end of said mandrel, said coupling means being detachably connected to said intake nut and said casing perforations, said mandrel perforations, said hollow chamber, said coupling and said intake nut sequentially communicating to define a flow path for the well fluid.

Claim 3

For use in flitering sand and other solid particles from well fluids prior to passage of the fluids through a pump intake nut of a well pump, the combination with the pump intake nut of a mandrel having a hollow chamber therethrough, an open upper end and a plurality of perforations through at least the lower portion of the walls thereof, a sock snugly slidable over said mandrel and covering the perforated portion of said mandrel for filtering undesirable particles from well fluids flowing through said sock, a casing snugly slidable over said mandrel and said sock having a closed lower end and a plurality of perforations through at least the lower portion of the walls thereof and coupling means for detachably securing an upper end of said casing in relation to an upper end of said mandrel with said sock disposed between said mandrel and said casing, said coupling means being detachably connected to said intake nut and said casing perforations, said sock, said mandrel perforations, said hollow chamber, said coupling and said intake nut sequentially communicating to define a flow path for the well fluid.

Claim 4

For use in flitering sand and other solid particles from well fluids prior to passage of the fluids through a pump intake nut of a well pump, the combination with the pump intake nut of a mandrel having a hollow chamber therethrough, an open upper end and a plurality of perforations through at least the lower portion of the walls thereof, a sock snugly slidable over said mandrel and covering the perforated portion of said mandrel for filtering undesirable particles from well fluids flowing through said sock, a casing snugly slidable over said mandrel and said sock having a closed lower end and a plurality of perforations through at least the lower portion of the walls thereof and coupling means for detachably securing an upper end of said casing in relation to an upper end of said mandrel with said sock disposed between said mandrel and said casing, said coupling means being detachably connected to said intake nut and said casing perforations, said sock, said mandrel perforations, said hollow chamber, said coupling and said intake nut sequentially communicating to define a flow path for the well fluid.

Claim 5

The combination according to claim 2 further comprising means for detachably sealing the upper perimeter of said sock about the upper perimeter of said mandrel.

Claim 6

The combination according to claim 3, said casing perforations being offset in relation to said mandrel perforations when said mandrel and said casing are secured to said coupling means.

Claim 7

The combination according to claim 3, said intake nut having a lower internal thread and said coupling means having a upper external thread rotationally engaged with said intake nut lower internal thread.

Claim 8

The combination according to claim 5, said coupling means having lower internal and external threads, said mandrel having an upper external thread rotationally engaged with said coupling means lower internal thread and said casing having an upper internal thread rotationally engaged with said coupling means lower external thread.

Claim 9

The combination according to claim 6, said sock comprising a plurality of layers of selected filtering materials.

Claim 10

The combination according to claim 7, said sock comprising external screen layers sandwiching at least one intermediate filter media layer.

Claim 11

For use in filtering sand and other solid particles from well fluids prior to passage of the fluids through a pump intake nut of a well pump, the intake nut having internal threads on a lower portion thereof, the combination with the pump intake nut of a cylindrical coupling having external threads on an upper end thereof and on a lower end thereof, said upper external threads of said coupling being rotationally engaged with said lower internal threads on the intake nut, a tubular member having an upper end coaxially secured within said coupling lower end and having a plurality of perforations dispersed at least along the lower portion thereof, a filtering means encasing the portion of said tubular member in which said perforations are dispersed for blocking sand or other particles from entry into said tubular member perforations, a cylindrical casing having a closed lower end and internal threads on an upper end thereof, said casing internal threads being rotationally secured to said coupling lower external threads with said tubular member and said filtering means disposed within said casing, said casing having a plurality of perforations dispersed along the length thereof for blocking larger sand or solid particles from entry into said casing, said casing perforations, said filtering means, said tubular member perforations, said coupling and said intake nut sequentially communicating to form a flow path for the well fluid.

Claim 12

For use in filtering sand and other solid particles from well fluids prior to passage of the fluids through a pump intake nut of a well pump, the intake nut having internal threads on a lower portion thereof, the combination with the pump intake nut of a cylindrical coupling having external threads on an upper end thereof and on a lower end thereof, said upper external threads of said coupling being rotationally engaged with said lower internal threads on the intake nut, a tubular member having an upper end coaxially secured within said coupling lower end and having a plurality of perforations dispersed at least along the lower portion thereof, a filtering means encasing the portion of said tubular member in which said perforations are dispersed for blocking sand or other particles from entry into said tubular member perforations, a cylindrical casing having a closed lower end and internal threads on an upper end thereof, said casing internal threads being rotationally secured to said coupling lower external threads with said tubular member and said filtering means disposed within said casing, said casing having a plurality of perforations dispersed along the length thereof for blocking larger sand or solid particles from entry into said casing, said casing perforations, said filtering means, said tubular member perforations, said coupling and said intake nut sequentially communicating to form a flow path for the well fluid.

Claim 13

The combination according to claim 9 further comprising means for detachably sealing the upper perimeter of said filtering means about the upper perimeter of said tubular member.

Claim 14

The combination according to claim 10, said casing perforations being offset in relation to said tubular member perforations when said tubular member and said casing are secured to said coupling.

Claim 15

The combination according to claim 11, said filtering means comprising a plurality of layers of selected filtering materials.

Claim 16

The combination according to claim 12, said filtering means comprising external screen layers sandwiching at least one intermediate filter media layer.