Means for collecting unwanted material in an oil or gas well

Claim 2

Means for collecting and bringing up unwanted junk material from an oil or gas well, comprising a grinder or mill (6) having front and outer surfaces and a coating (8) of a wear resistant material along said front and outer surfaces, said mill (6) being secured to a throughgoing drilling pipe having an inner centric liquid first channel (7), said mill (6) further comprising a second channel (4) extending through said mill (6) and into a junk chamber (3) behind or after said mill (6), said junk chamber having at its distal end a strainer (2) allowing penetration of liquid, but restraining the unwanted material, whereby the rotation of said means with the rotation of said throughgoing drilling pipe ensures that unwanted junk material is brought into said second channel (4) and from said second channel (4) into said junk chamber (3).

Claim 3

Means according to claim 1 wherein the faces of the front and outer surfaces of said mill (6) have several forwardly protruding webs or cutters coated with wear resistant material.

Claim 4

Means according to claim 2 wherein said wear resistant material is tungsten carbide.

Claim 5

Means according to claim 3, wherein the front end of said second channel (4) has a funnel shape to assist bringing the material into said second opening.

Claim 6

Means according to claim 4 and further comprising a bead (13) arranged around the outer wall (5) of said means, near said strainer (2), the bead (13) being axially rounded and having a coating of wear resistant material, with the largest diameter of the bead (13) being substantially the same as, but not larger than, the outer diameter of said mill (6).

Claim 7

Means according to claim 5 and further comprising at least one magnet plate (14, 15) being arranged in said junk chamber (3), and secured to, respectively, said mill (6) and the inner wall of the cylindrical wall (5), and being adapted to capture collected junk.

Claim 8

Means for collecting and bringing up unwanted junk material from an oil or gas well, comprising a grinder or mill (6) having front and outer surfaces and a coating (8) of a wear resistant material along said front and outer surfaces, said mill (6) being secured to a throughgoing drilling pipe having an inner centric liquid first channel (7), said mill (6) further comprising a second channel (4) extending through said mill (6) and into a junk chamber (3) behind or after said mill (6), said junk chamber having at its distal end strainer (2) allowing penetration of liquid, but restraining the unwanted material, whereby the rotation of said means with the rotation of said throughgoing drilling pipe ensures that unwanted junk material is brought into said second channel (4) and from said second channel (4) into said junk chamber (3), said mill (6) further comprising two substantially semi cylindrical parts having different outer diameters and having disposed between the outer most of said parts and the outer diameter of said throughgoing drilling pipe conical and spiral leading ends coated with wear resistant material.

Claim 9

Means for collecting and bringing up unwanted junk material from an oil or gas well, comprising a grinder or mill (6) having front and outer surfaces and a coating (8) of a wear resistant material along said front and outer surfaces, said mill (6) being secured to a throughgoing drilling pipe having an inner centric liquid first channel (7), said mill (6) further comprising a second channel (4) extending through said mill (6) and into a junk chamber (3) behind or after said mill (6), said junk chamber having at its distal end strainer (2) allowing penetration of liquid, but restraining the unwanted material, whereby the rotation of said means with the rotation of said throughgoing drilling pipe ensures that unwanted junk material is brought into said second channel (4) and from said second channel (4) into said junk chamber (3), said mill (6) further comprising two substantially semi cylindrical parts having different outer diameters and having disposed between the outer most of said parts and the outer diameter of said throughgoing drilling pipe conical and spiral leading ends coated with wear resistant material.

Claim 10

Means according to claim 7, wherein the faces of the front and outer surfaces of said mill (6) have several forwardly protruding webs or cutters coated with wear resistant material.

Claim 11

Means according to claim 8, wherein said wear resistant material is tungsten carbide.

Claim 12

Means according to claim 9, wherein the front end of said second channel (4) has a funnel shape to assist bringing the material into said second opening.

Claim 13

Means according to claim 10 and further comprising a bead (13) arranged around the outer wall (5) of said means, near said strainer (2), the bead (13) being axially rounded and having a coating of wear resistant material, with the largest diameter of the bead (13) being substantially the same as, but not larger than, the outer diameter of said mill (6).

Claim 14

Means according to claim 11, and further comprising at least one magnet plate (14, 15) being arranged in said junk chamber (3), and secured to respectively said mill (6) and the inner wall of the cylindrical wall (5), and being adapted to capture collected junk.