US2734767A - Magnetic junk catcher - Google Patents

Magnetic junk catcher Download PDF

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US2734767A
US2734767A US2734767DA US2734767A US 2734767 A US2734767 A US 2734767A US 2734767D A US2734767D A US 2734767DA US 2734767 A US2734767 A US 2734767A
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catcher
magnetic
cutter
extension
well
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B31/00—Fishing for or freeing objects in boreholes or wells
    • E21B31/06—Fishing for or freeing objects in boreholes or wells using magnetic means

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  • This invention relates to a well tool in the nature of a magnetic junk catcher, and more particularly to a magnetic device in combination with a rotary shoe and adapted to be employed in well drilling equipment to catch and retain metallic fragments in a well bore when operated therein.
  • Relatively small particles of disintegrated material are readily .removed in this manner, while larger particles, and particularly large particles of metal, which are heavy, may be carried part way up by the circulating fluid, and then become lodged or settled in some portion of the bore, where there may bean enlargment, or at some location where the velocity of the circulating fluid decreases, thus causing an accumulation of material likely to interfer with the free flow of the circulating fluid, or to form an obstruction preventing proper operation of the equipment.
  • the present invention has for an important object the provision of a magnetic junk catcher for use in or in combination with well equipment of the type referred to, whereby particles of metal which may find their way into the rotary shoe may be retained therein, and may be removed with the shoe and wash-over string on completion of the operation of the equipment.
  • Another object of the invention is to provide a magnetic junkcatcher which may be readily appliedtto well equipment of the type mentioned, without interferring with the operation or action of the rotary shoe, or with the flow of circulating fluid through the equipment.
  • a further object of the invention is the provision of a magnetic junk catcher which is adapted to be rotatably carried adjacent the rotary shoe, and which will effectively retain particles of magnetic material entering the .shoe with the circulating fluid.
  • a further object of the invention is to provide a magnetic junk catcher in the form of a compact unit -including a permanent magnet, and adapted to be readily inserted in and removed from working position relative to amtary'shoe, said unit having or providing passageways for the flow of circulating fluid therethrough.
  • Figure 2 is a transverse cross-sectional view taken along the line 22 of Figure 1, looking in the direction indicated by the arrows;
  • Figure 3 is a transverse cross-sectional view taken along the line 33 of Figure 1, looking in the direction indicated by the arrows;
  • Figure 4 is a .bottom end view, looking at the lower end of the device as illustrated in Figure 1.
  • the numeral 10 designates a tubular member or sleeve-like extension of a body 18, which extension is of generally cylindrical formation and is provided at its lower end with an annular cutter 60 with downwardly directed teeth 12.
  • the cutter serves as a means for cutting or disintegrating the formation or material in a 'well bore, or objects located therein, as well as for agitating material in the bore when the tool is rotated.
  • the rotary cutter is provided with an internal annular upwardly facing shoulder 14.
  • the tubular body extension is internally threaded, as indicated at 16, at its upper end, to receive the lower externally threaded end 16 of the "body 18, which has at its upper end a pin 20 for connection to the lower end of the usual wash-over string with which a tool of this type is customarily employed.
  • the threaded parts provide a releasable joint or connection between the body 18 and the tubular extension of the body.
  • the body18 is an elongate member and has a flow passage or bore extending longitudinally through it to handle fluid.
  • the flow passage may be enlarged by a counterbore 22 adjacent its lower end, for a purpose later to be made apparent.
  • the rotary shoe or cutter rotates with the washoverstring to which the body is applied to out and disintegrated the formation or material in the well bore to form a clearance between the fish and the wall of the bore, or to distintegrate material which has become lodged in the well bore to facilitate its removal, and a circulation of fluid is maintained during the operation of the cutter, downwardly through the wash-over string and body and upwardly about the same, or in the reverse direction, to carry cit the particles of disintegrated material in order to remove the same from the well bore.
  • the magnetic junk catcher in accordance with the present invention is located within the body extension 10, and is freely rotatable therein between the internal shoulder 14 of the cutter and the lower end of the body 18.
  • the junkcatcher in the form shown comprises anonmagnetic cylindrical body or case 24, preferably formed of bronze or other non-magnetic material, and having an external diameter somewhat less than the internal diameter of the extension so the catcher can turn or rotate therein.
  • the catcher case '24 has its ends opposing and adjacent the shoulder 14 and body 18 so the catcher is held between the internal shoulder 14 and the lower end of the coupling member 18.
  • the case '24 is slightly shorter than the distance between the internal shoulder 14'and the lower'end of the body 18, so that the catcher may rotate freely relative to the cutter.
  • the "case 24 is provided with suitable passageways 28 extending longitudinally therethrough and having communication with the counterbore 22.
  • the passageways 28 provide openings through which circulated fluid may pass, during the operation of the equipment.
  • the particular catcher shown has, in addition to the non-magnetic case, a plurality of units of magnetic material that will be referred to as permanent magnet units 32 carried in openings 30 provided in the body 24, in suitably spaced relation.
  • the magnet units are shown as elongate members, round in cross section, and the openings 30 provided to carry them are bores extending longitudinally in the non-magnetic case from one end to the other thereof.
  • the upper end of the case is provided with a socket in the form of a counterbore 34 in which a plate or head 36 is positioned.
  • the head 36 is retained in the counterbore by suitable fastening means, such as the screws 38, or the like so that it is maintained in contact with the upper ends of the several magnet units 32.
  • the non-magnetic case 24 is provided with recesses or openings 40 within which contact plates, such as those indicated at 42, are positioned.
  • the plates 42 extend over the bores 30 to engage and retain the permanent magnet units 32 within the case.
  • Suitable fastening means, such as the screws 44 may be employed to secure the plates to the case.
  • case 24 and magnet unit 32 with the head and contact plates related thereto may be readily assembled and positioned in the body extension 10, and the body 18 may then be screwed into the upper end of the extension to retain the junk catcher in operating position. In the event that it becomes necessary to remove the catcher, this may readily be accomplished by detaching the extension from the body 18, whereupon no difliculty will be encountered in removing the catcher, since it has a loose or working fit in the body extension.
  • the magnet units 32 may be easily removed and replaced, when necessary or desirable by removing the contact plates 42 from the bottom of the non-magnetic case, which can be accomplished without disassembling the equipment.
  • the same is cooperatively related to an annular cutter in the manner described and the assembly is lowered into the well at the lower end of the wash-over string, whereupon the cutter may be rotated, while maintaining a flow of circulating fluid through the tool in either direction. It will be apparent that the cutter may rotate freely relative to the case 24, and any loose fragments of magnetic metal entering the cutter will be caught and held by magnetic action at magnetic contact plates which are exposed at the lower end of the catcher.
  • the invention provides a magnetic junk catcher, which will cooperate advantageously with a rotary or annular cutter or similar tool, wherever the same may be used, and which is easily replaceable for purposes of maintenance and repair.
  • a well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter.
  • a well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter, the catcher including a case of non-magnetic and a unit of permanent magnet material within and carried by the case.
  • a well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage through the catcher between the body and the lower end of the catcher where it opens within the cutter.
  • a well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and r0 tatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter, the catcher including a case of non-magnetic material engaged with the shoulder and the body and with an opening therein, a permanent magnet in said opening and a plate at the lower end of the case exposed at the lower end of the catcher and within the cutter and engaging said magnet.
  • a well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter, the catcher including an elongate case of non-magnetic material, a pair of spaced permanent magnets in the case, a head at the upper end of the case adjacent the body engaging said magnets and a pair of exposed spaced plates at the lower end of, the body adjacent the case and one engaging one of said magnets and another engaging another of said magnets.
  • a well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage in the fishing tool between the upper end of the catcher and the lower end thereof and open at the upper end of the catcher to the passage in the body and open at the lower end of the catcher within the cutter.
  • a well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage through the catcher between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter.
  • a well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having aninternal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage in the fishing tool between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter, the catcher including permanent magnet and non-magnetic elements extending lengthwise of the tool and establishing spaced magnetic poles at the lower end of the catcher and within the cutter.
  • a well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal move ment therein by the shoulder and body, there being a fluid passage in the fishing tool between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter, the catcher including permanent magnet and non-magnetic elements extending lengthwise of the tool and establishing spaced magnetic poles at the lower end of the catcher and within the cutter, the non-magnetic element of the catcher being at the exterior of the catcher adjacent the body, the extension and the shoulder.
  • a well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage in the catcher between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter, the catcher including permanent magnet and non-magnetic elements extending lengthwise'of the tool and establishing spaced magnetic poles at the lower end of the catcher and within the cutter, the fluid passage open at the lower end of the catcher being in the non-magnetic element of the catcher.
  • a junk catcher for use in a well tool and including, an elongate body of non-magnetic material having an opening therein and a fluid passage extending therethrough from one end to the other, a unit of permanent magnet material in the opening establishing a magnetic pole at one end of the catcher, and a contact plate at the said end of the catcher in fixed position relative to the body and engaging said unit.
  • a junk catcher for use in a well tool and including, an elongate body of non-magnetic material having a fluid passage extending through it from one end to the other, spaced units of magnetic material in the body extending longitudinally therein, a head at one end of the body and in contact with each of said units, and spaced contact plates at the other end of the body one in contact with one of said units and another in contact with another of said units.
  • a junk catcher for use in a Well tool and including, an elongate body of non-magnetic material having spaced openings therein and a fluid passage extending therethrough from one end to the other, spaced units of magnetic material in the openings and extending longitudinally of the body, a head at one end of the body and in contact with each of said units, and spaced contact plates at the other end of the body one in contact with one of said units and another in contact with another of said units.

Description

Feb. 14, 1956 H. D. DONHAM .MAGN ETIC JUNK CATCHER Filed May 24, 1952 INVENTOR.
M W 0 0 u ATTOR/Vf/ United rates Patent MAGNETIC CATCHER Horace D. Donham, 0dessa,'Tex.
Application May 24, 1952, Serial No. 289,817
13 Claims. (Cl. 294*655) This invention relates to a well tool in the nature of a magnetic junk catcher, and more particularly to a magnetic device in combination with a rotary shoe and adapted to be employed in well drilling equipment to catch and retain metallic fragments in a well bore when operated therein.
In the drilling of oil wells, and especially in fishing operations employed to remover lost equipment in such wells, it is customary to attach a rotary or annular toothed shoe to the lower end of a wash-over string to provide a means for cutting a clearance between the fish and the wall of the well bore, in order to facilitate .the loosening and removal of the fish.
During the use of rotary shoes in carrying out fishing operations, it is frequently desirable to maintain the cireulation of drilling mud or well fluid, either downwardly through the string and upwardly in the bore about the string, or in the reverse direction, to effect washingof the the fish and the carrying disintegrated material upwardly for convenient removal from the bore. Relatively small particles of disintegrated material are readily .removed in this manner, while larger particles, and particularly large particles of metal, which are heavy, may be carried part way up by the circulating fluid, and then become lodged or settled in some portion of the bore, where there may bean enlargment, or at some location where the velocity of the circulating fluid decreases, thus causing an accumulation of material likely to interfer with the free flow of the circulating fluid, or to form an obstruction preventing proper operation of the equipment.
The present invention has for an important object the provision of a magnetic junk catcher for use in or in combination with well equipment of the type referred to, whereby particles of metal which may find their way into the rotary shoe may be retained therein, and may be removed with the shoe and wash-over string on completion of the operation of the equipment.
Another object of the invention is to provide a magnetic junkcatcher which may be readily appliedtto well equipment of the type mentioned, without interferring with the operation or action of the rotary shoe, or with the flow of circulating fluid through the equipment.
A further object of the invention is the provision of a magnetic junk catcher which is adapted to be rotatably carried adjacent the rotary shoe, and which will effectively retain particles of magnetic material entering the .shoe with the circulating fluid.
A further object of the invention is to provide a magnetic junk catcher in the form of a compact unit -including a permanent magnet, and adapted to be readily inserted in and removed from working position relative to amtary'shoe, said unit having or providing passageways for the flow of circulating fluid therethrough.
.-A still further object of the invention is the provision of a magnetic junk catcher, of simple design and :rugged construction, which is easily replaced for purposes of maintenance and repair, and which is capable of with- 2,734,767 Patented Feb. 14, 1956 standing the extreme conditions of exposure and wear to which such a device is likely to be subjected.
The above and other important objects and advantages of the invention will best be understood from the follow ing detailed description, constituting a specification of the same, when considered in conjunction with the annexed drawings, wherein- Figure 1 is a vertical, central, sectional view, showing the magnetic catcher combined with a rotary shoe to form a part of the fishing equipment;
Figure 2 is a transverse cross-sectional view taken along the line 22 of Figure 1, looking in the direction indicated by the arrows;
Figure 3 is a transverse cross-sectional view taken along the line 33 of Figure 1, looking in the direction indicated by the arrows; and
Figure 4 is a .bottom end view, looking at the lower end of the device as illustrated in Figure 1.
Referring now to the drawings in greater detail, the numeral 10 designates a tubular member or sleeve-like extension of a body 18, which extension is of generally cylindrical formation and is provided at its lower end with an annular cutter 60 with downwardly directed teeth 12. The cutter serves as a means for cutting or disintegrating the formation or material in a 'well bore, or objects located therein, as well as for agitating material in the bore when the tool is rotated. .Above the teeth 12 the rotary cutter is provided with an internal annular upwardly facing shoulder 14. The tubular body extension is internally threaded, as indicated at 16, at its upper end, to receive the lower externally threaded end 16 of the "body 18, which has at its upper end a pin 20 for connection to the lower end of the usual wash-over string with which a tool of this type is customarily employed. The threaded parts provide a releasable joint or connection between the body 18 and the tubular extension of the body.
The body18 is an elongate member and has a flow passage or bore extending longitudinally through it to handle fluid. The flow passage may be enlarged by a counterbore 22 adjacent its lower end, for a purpose later to be made apparent.
In the normal use of equipment of the kind described above, the rotary shoe or cutter rotates with the washoverstring to which the body is applied to out and disintegrated the formation or material in the well bore to form a clearance between the fish and the wall of the bore, or to distintegrate material which has become lodged in the well bore to facilitate its removal, and a circulation of fluid is maintained during the operation of the cutter, downwardly through the wash-over string and body and upwardly about the same, or in the reverse direction, to carry cit the particles of disintegrated material in order to remove the same from the well bore.
The magnetic junk catcher in accordance with the present invention is located within the body extension 10, and is freely rotatable therein between the internal shoulder 14 of the cutter and the lower end of the body 18. The junkcatcher in the form shown comprises anonmagnetic cylindrical body or case 24, preferably formed of bronze or other non-magnetic material, and having an external diameter somewhat less than the internal diameter of the extension so the catcher can turn or rotate therein. "The catcher case '24 has its ends opposing and adjacent the shoulder 14 and body 18 so the catcher is held between the internal shoulder 14 and the lower end of the coupling member 18. The case '24 is slightly shorter than the distance between the internal shoulder 14'and the lower'end of the body 18, so that the catcher may rotate freely relative to the cutter.
The "case 24 is provided with suitable passageways 28 extending longitudinally therethrough and having communication with the counterbore 22. The passageways 28 provide openings through which circulated fluid may pass, during the operation of the equipment. The particular catcher shown has, in addition to the non-magnetic case, a plurality of units of magnetic material that will be referred to as permanent magnet units 32 carried in openings 30 provided in the body 24, in suitably spaced relation. The magnet units are shown as elongate members, round in cross section, and the openings 30 provided to carry them are bores extending longitudinally in the non-magnetic case from one end to the other thereof. The upper end of the case is provided with a socket in the form of a counterbore 34 in which a plate or head 36 is positioned. The head 36 is retained in the counterbore by suitable fastening means, such as the screws 38, or the like so that it is maintained in contact with the upper ends of the several magnet units 32.
At the lower end of the catcher the non-magnetic case 24 is provided with recesses or openings 40 within which contact plates, such as those indicated at 42, are positioned. The plates 42 extend over the bores 30 to engage and retain the permanent magnet units 32 within the case. Suitable fastening means, such as the screws 44 may be employed to secure the plates to the case.
In the case illustrated there are four permanent magnet units 32 spaced apart in the non-magnetic case 24 and all connected together or related magnetically at the upper end of the catcher by the common head 36. At the lower end of the catcher there are two spaced contact plates exposed at the lower end (see Fig. 4). One contact plate 42 engages and is magnetically related to two of the permanent magnet units 32 forming a magnetic pole at the lower end of the catcher and the other contact plate 42 engages and is magnetically related to the other two permanent magnet units 32 forming the other magnetic pole at the lower end of the catcher. is, in effect, a permanent magnet assembly in or carried by a non-magnetic case and having spaced magnetic poles at the lower exposed end of the catcher and within the annular toothed cutter with which the catcher is combined.
It will be apparent that the case 24 and magnet unit 32 with the head and contact plates related thereto may be readily assembled and positioned in the body extension 10, and the body 18 may then be screwed into the upper end of the extension to retain the junk catcher in operating position. In the event that it becomes necessary to remove the catcher, this may readily be accomplished by detaching the extension from the body 18, whereupon no difliculty will be encountered in removing the catcher, since it has a loose or working fit in the body extension. The magnet units 32 may be easily removed and replaced, when necessary or desirable by removing the contact plates 42 from the bottom of the non-magnetic case, which can be accomplished without disassembling the equipment.
In making use of the junk catcher, as described above, the same is cooperatively related to an annular cutter in the manner described and the assembly is lowered into the well at the lower end of the wash-over string, whereupon the cutter may be rotated, while maintaining a flow of circulating fluid through the tool in either direction. It will be apparent that the cutter may rotate freely relative to the case 24, and any loose fragments of magnetic metal entering the cutter will be caught and held by magnetic action at magnetic contact plates which are exposed at the lower end of the catcher.
From the foregoing description and from the drawings, it will be seen that the invention provides a magnetic junk catcher, which will cooperate advantageously with a rotary or annular cutter or similar tool, wherever the same may be used, and which is easily replaceable for purposes of maintenance and repair.
The construction The invention has been described in connection with a specific embodiment of the same, but it will be understood that this is intended by way of illustration only, and that numerous changes can be made in the construction and arrangement of the various parts without departing from the spirit of the invention, or the scope of the appended claims.
Having thus clearly shown and described the invention, what is claimed as new and desired to secure by Letters Patent is:
1. A well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter.
2. A well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter, the catcher including a case of non-magnetic and a unit of permanent magnet material within and carried by the case.
3. A well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage through the catcher between the body and the lower end of the catcher where it opens within the cutter.
4. A well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and r0 tatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter, the catcher including a case of non-magnetic material engaged with the shoulder and the body and with an opening therein, a permanent magnet in said opening and a plate at the lower end of the case exposed at the lower end of the catcher and within the cutter and engaging said magnet.
5. A well fishing tool including, a body with a fluid passage therein and adapted to be carried by a tubular fluid carrying well string to be rotated thereby, an annular toothed cutter mounted on the body to project downwardly below the body and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely carried between the shoulder and the body and rotatable relative thereto, there being a fluid passage in the fishing tool between the body and the lower end of the catcher where it opens within the cutter, the catcher including an elongate case of non-magnetic material, a pair of spaced permanent magnets in the case, a head at the upper end of the case adjacent the body engaging said magnets and a pair of exposed spaced plates at the lower end of, the body adjacent the case and one engaging one of said magnets and another engaging another of said magnets.
6. A well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage in the fishing tool between the upper end of the catcher and the lower end thereof and open at the upper end of the catcher to the passage in the body and open at the lower end of the catcher within the cutter.
7. A well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage through the catcher between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter.
8. A well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having aninternal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage in the fishing tool between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter, the catcher including permanent magnet and non-magnetic elements extending lengthwise of the tool and establishing spaced magnetic poles at the lower end of the catcher and within the cutter.
9. A well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal move ment therein by the shoulder and body, there being a fluid passage in the fishing tool between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter, the catcher including permanent magnet and non-magnetic elements extending lengthwise of the tool and establishing spaced magnetic poles at the lower end of the catcher and within the cutter, the non-magnetic element of the catcher being at the exterior of the catcher adjacent the body, the extension and the shoulder.
10. A well fishing tool including, an elongate body having a fluid passage extending longitudinally therein and adapted to be carried by a tubular fluid carrying string to be rotated thereby, a tubular body extension releasably connected thereto and depending therefrom, an annular toothed cutter carried by the extension at the lower end thereof and having an internal upwardly facing shoulder, and a permanent magnet junk catcher freely rotatable in the extension and confined against longitudinal movement therein by the shoulder and body, there being a fluid passage in the catcher between the upper end of the catcher and the lower end thereof and open at the lower end of the catcher within the cutter, the catcher including permanent magnet and non-magnetic elements extending lengthwise'of the tool and establishing spaced magnetic poles at the lower end of the catcher and within the cutter, the fluid passage open at the lower end of the catcher being in the non-magnetic element of the catcher.
11. A junk catcher for use in a well tool and including, an elongate body of non-magnetic material having an opening therein and a fluid passage extending therethrough from one end to the other, a unit of permanent magnet material in the opening establishing a magnetic pole at one end of the catcher, and a contact plate at the said end of the catcher in fixed position relative to the body and engaging said unit.
12. A junk catcher for use in a well tool and including, an elongate body of non-magnetic material having a fluid passage extending through it from one end to the other, spaced units of magnetic material in the body extending longitudinally therein, a head at one end of the body and in contact with each of said units, and spaced contact plates at the other end of the body one in contact with one of said units and another in contact with another of said units.
13. A junk catcher for use in a Well tool and including, an elongate body of non-magnetic material having spaced openings therein and a fluid passage extending therethrough from one end to the other, spaced units of magnetic material in the openings and extending longitudinally of the body, a head at one end of the body and in contact with each of said units, and spaced contact plates at the other end of the body one in contact with one of said units and another in contact with another of said units.
References Cited in the file of this patent UNITED STATES PATENTS 432,896 Porter July 22, 1890 2,431,361 Athy Nov. 25, 1947 2,451,231 Manegold Oct. 12, 1948 2,522,294 Noble Sept. 12, 1950 2,539,435 Kirby Ian. 30, 1951 2,556,849 Nolley et al June 12, 1951 2,657,752 Ballew et al. Nov. 3, 1953 2,668,077 Kirby Feb. 2, 1954
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830663A (en) * 1953-11-02 1958-04-15 John H Kirby Permanent magnet fishing tool
US2857970A (en) * 1954-07-02 1958-10-28 Orren B Hopkins Magnetic fishing tool
US2977147A (en) * 1957-10-01 1961-03-28 Alexander T Cooper Well fishing tool
US3032363A (en) * 1959-12-24 1962-05-01 Railway Automation Maintenance Magnetic tie plate lifter
US3243218A (en) * 1964-04-24 1966-03-29 Thelma E Jennings Magnetic junk retrieving tool
US3378089A (en) * 1966-04-04 1968-04-16 Kenneth R. Marsh Combined junk basket
US3520359A (en) * 1968-06-27 1970-07-14 Herman T Ehrlich Magnetic junk basket
US3637033A (en) * 1969-01-22 1972-01-25 William Mayall Drilling apparatus
US3905631A (en) * 1974-05-13 1975-09-16 Tom E Ricks Magnetic fishing tool
US4125167A (en) * 1977-06-06 1978-11-14 Smith International, Inc. Big hole bit
US20040069322A1 (en) * 2002-10-10 2004-04-15 Schneider John A. Scavenging metallic debris from buried metal pipelines
US20070085645A1 (en) * 2004-08-31 2007-04-19 Ruttley David J Magnetic tool for retrieving metal objects from a well bore
US20070102161A1 (en) * 2005-09-09 2007-05-10 Gazewood Michael J Magnetic fishing tool and method
US20120261114A1 (en) * 2011-04-14 2012-10-18 Lee Oilfield Service Ltd. Downhole magnet tool and method of assembly
CN105178902A (en) * 2015-08-05 2015-12-23 中国石油天然气股份有限公司 Lifting type fishing tool
US10072473B2 (en) * 2016-07-01 2018-09-11 Baker Hughes, A Ge Company, Llc Conforming magnet tool for recovery of downhole debris

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US432896A (en) * 1890-07-22 Drill-hole magnet
US2431361A (en) * 1945-04-06 1947-11-25 Internat Derrick And Equipment Retrieving tool for well bores
US2451231A (en) * 1944-12-11 1948-10-12 Dings Magnetic Separator Co Magnet
US2522294A (en) * 1949-09-13 1950-09-12 John D Noble Magnetic fishing tool
US2539435A (en) * 1946-05-07 1951-01-30 John H Kirby Magnetic fishing tool
US2556849A (en) * 1948-03-30 1951-06-12 Standard Oil Dev Co Magnetic junk basket for well bores
US2657752A (en) * 1949-03-31 1953-11-03 Harold W Ballew Magnetic fishing tool
US2668077A (en) * 1952-07-30 1954-02-02 Ii John H Kirby Magnetic fishing tool

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US432896A (en) * 1890-07-22 Drill-hole magnet
US2451231A (en) * 1944-12-11 1948-10-12 Dings Magnetic Separator Co Magnet
US2431361A (en) * 1945-04-06 1947-11-25 Internat Derrick And Equipment Retrieving tool for well bores
US2539435A (en) * 1946-05-07 1951-01-30 John H Kirby Magnetic fishing tool
US2556849A (en) * 1948-03-30 1951-06-12 Standard Oil Dev Co Magnetic junk basket for well bores
US2657752A (en) * 1949-03-31 1953-11-03 Harold W Ballew Magnetic fishing tool
US2522294A (en) * 1949-09-13 1950-09-12 John D Noble Magnetic fishing tool
US2668077A (en) * 1952-07-30 1954-02-02 Ii John H Kirby Magnetic fishing tool

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2830663A (en) * 1953-11-02 1958-04-15 John H Kirby Permanent magnet fishing tool
US2857970A (en) * 1954-07-02 1958-10-28 Orren B Hopkins Magnetic fishing tool
US2977147A (en) * 1957-10-01 1961-03-28 Alexander T Cooper Well fishing tool
US3032363A (en) * 1959-12-24 1962-05-01 Railway Automation Maintenance Magnetic tie plate lifter
US3243218A (en) * 1964-04-24 1966-03-29 Thelma E Jennings Magnetic junk retrieving tool
US3378089A (en) * 1966-04-04 1968-04-16 Kenneth R. Marsh Combined junk basket
US3520359A (en) * 1968-06-27 1970-07-14 Herman T Ehrlich Magnetic junk basket
US3637033A (en) * 1969-01-22 1972-01-25 William Mayall Drilling apparatus
US3905631A (en) * 1974-05-13 1975-09-16 Tom E Ricks Magnetic fishing tool
US4125167A (en) * 1977-06-06 1978-11-14 Smith International, Inc. Big hole bit
US20040069322A1 (en) * 2002-10-10 2004-04-15 Schneider John A. Scavenging metallic debris from buried metal pipelines
US6848143B2 (en) * 2002-10-10 2005-02-01 John A. Schneider Scavenging metallic debris from buried metal pipelines
US20070085645A1 (en) * 2004-08-31 2007-04-19 Ruttley David J Magnetic tool for retrieving metal objects from a well bore
US20070102161A1 (en) * 2005-09-09 2007-05-10 Gazewood Michael J Magnetic fishing tool and method
US7357183B2 (en) 2005-09-09 2008-04-15 Venturi Oil Tools Magnetic fishing tool and method
US20120261114A1 (en) * 2011-04-14 2012-10-18 Lee Oilfield Service Ltd. Downhole magnet tool and method of assembly
US8689889B2 (en) * 2011-04-14 2014-04-08 Lee Oilfield Service Ltd. Downhole magnet tool and method of assembly
CN105178902A (en) * 2015-08-05 2015-12-23 中国石油天然气股份有限公司 Lifting type fishing tool
CN105178902B (en) * 2015-08-05 2018-01-05 中国石油天然气股份有限公司 A kind of lifting type fishing tool
US10072473B2 (en) * 2016-07-01 2018-09-11 Baker Hughes, A Ge Company, Llc Conforming magnet tool for recovery of downhole debris
GB2566893B (en) * 2016-07-01 2021-07-14 Baker Hughes A Ge Co Llc Conforming magnet tool for recovery of downhole debris

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