US20010013413A1 - Apparatus for retrieving metal objects from a wellbore - Google Patents
Apparatus for retrieving metal objects from a wellbore Download PDFInfo
- Publication number
- US20010013413A1 US20010013413A1 US09/789,876 US78987601A US2001013413A1 US 20010013413 A1 US20010013413 A1 US 20010013413A1 US 78987601 A US78987601 A US 78987601A US 2001013413 A1 US2001013413 A1 US 2001013413A1
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- magnet
- tool body
- members
- assemblies
- protector
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- 239000002184 metal Substances 0.000 title claims abstract description 20
- 238000000429 assembly Methods 0.000 claims abstract description 30
- 230000000712 assembly Effects 0.000 claims abstract description 30
- 230000001012 protector Effects 0.000 claims abstract description 23
- 239000002923 metal particle Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 description 36
- 238000003801 milling Methods 0.000 description 14
- 239000012530 fluid Substances 0.000 description 11
- 238000005553 drilling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 241001331845 Equus asinus x caballus Species 0.000 description 2
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- 238000007796 conventional method Methods 0.000 description 2
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- 230000005484 gravity Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Definitions
- the present invention relates to wellbore tools and more particularly to an apparatus for retrieval of metal objects, such as cuttings and other foreign objects that accumulate in the process of perforating or milling over bridge plugs and other down hole obstructions from a wellbore.
- bridge plugs are conventionally used in the oil and gas industry. These bridge plugs are installed in the annulus and are often covered in cement. Removal of such plugs can sometimes pose a problem for the industry.
- a rotary bit drills the cement and plugs out, while some of the cuttings of the plugs are carried out to the surface by a liquid circulated down hole.
- a production packer needs to be removed together with the metal pipe that it surrounds.
- milling tools with gravity fed boot baskets are used for retrieving pieces of metal from the wellbore. After retrieval of the production packer, it may become necessary to run a conventional fishing magnet to retrieve additional junk and cuttings.
- a conventional fishing magnet is mounted inside a housing that is lowered into a wellbore. It is limited in the ability to retrieve cuttings in that its magnetization is restricted to the extreme bottom surface of the magnet. The fact that circulating fluids lift the cuttings away from the bottom surface of the magnet renders that conventional fishing magnet useless in this situation.
- a boot basket is used for collecting cuttings that did not attach themselves to the conventional magnet.
- a boot basket has small openings for catching these particles. Consequently, many large size pieces or very small pieces suspended in the fluid flow are not trapped in the basket and remain in the wellbore.
- the present invention contemplates elimination of drawbacks associated with the prior art and provision of a wellbore apparatus for removal of metal objects, such as cuttings, and other foreign particles that provides for the use of sets of magnets spaced longitudinally along the tool body.
- each magnet assembly is comprised of a plurality of magnets encircling the body of the tool and covering a surface area greater than one half of the tool body.
- One of the embodiments of the invention provides for arcuate in cross section magnet members that are detachably secured on the tool body.
- the second embodiment provides for trapezoidal in cross section magnet members that extend longitudinally in parallel relationship to a central axis of the tool body.
- the tool of the second embodiment further provides for magnet protectors mounted adjacent to each magnet member. Each magnet protector has a triangular cross section and has a slanted surface that is angled in the direction of rotation.
- each magnet and the next adjacent magnet protector forms a “trap” that receives and retains metal particles pushed away by the leading surface of the adjacent magnet member. Consequently, the capability of the tool to retain cuttings for subsequent retrieval to the surface is significantly increased in comparison with conventional magnet tools.
- FIG. 1 is a side view of the packer removal tool of the present invention.
- FIG. 2 is a cross-sectional view of the magnet used in the tool of the present invention.
- FIG. 3 is a top view of the tool of the second embodiment of the present invention lowered into the wellbore.
- FIG. 4 is a detail view of the second embodiment of the present invention showing three vertically spaced magnet assemblies.
- FIG. 5 is a magnet profile suitable for use in the second embodiment of the present invention.
- FIG. 6 is a schematic view showing position of the apparatus of the present invention in combination with a conventional milling tool.
- FIG. 7 is a schematic view showing the apparatus of the present invention in combination with a ported jet sub for admitting a circulating fluid.
- numeral 10 designates the well bore apparatus in accordance with the present invention.
- the apparatus 10 comprises a generally cylindrical body 12 provided with a central through opening 14 .
- the circulating fluids are admitted into the central opening 14 from an upper end 16 of the body 12 .
- An upper sub 18 is fixedly secured in circumferential relationship about the body 12 adjacent the upper end 16
- a lower sub 20 is secured in circumferential relationship about the body 12 adjacent a lower end 22 .
- the upper sub 18 is provided with external threads 24 and the lower sub 26 is provided with internal threads 28 .
- the threads 24 allow connection of the tool 10 to a bumper jar 30 schematically shown in FIGS. 6 and 7.
- the bumper jar 30 is conventionally mounted on a drill string above the junk and cuttings removal tools.
- the internal threads 28 on the lower sub 26 can be used for attaching the apparatus 10 to a jet sub 32 for admitting circulating liquid into a wellbore 34 (FIG. 7). The liquid exits the jet sub 32 through one or more openings, or ports 36 formed in the sub 32 .
- the internal threads 28 may be used for attaching the tool 10 to a boot basket 38 (FIG. 6).
- the boot basket 38 conventionally carries at its lower end a milling tool 40 (FIG. 6).
- the upper magnet assembly 42 is vertically spaced from the lower magnet assembly 44 .
- Each magnet assembly 42 and 44 comprises a plurality of arcuate magnets 46 and 48 (FIG. 2) that are detachably secured to the body 12 by screws 50 or other similarly suitable means.
- the magnets 46 and 48 When positioned on the body 12 , the magnets 46 and 48 resemble a cylindrical sleeve having an inner diameter slightly greater than an outside diameter of the body 12 .
- the magnet assemblies 42 and 44 occupying a large surface of the tool 10 , allow retrieval of a significantly greater amount of metal pieces from the wellbore 34 .
- the tool 100 comprises a cylindrical body 102 having a through opening 104 for admitting circulating fluid into the wellbore 34 .
- An upper sub 106 has external threads 108 .
- the upper sub 106 and a lower sub 110 partially shown in FIG. 4) are used in a manner similar to that of the subs 18 and 26 of the first embodiment of the present invention.
- magnet assemblies 110 , 112 and 114 Mounted between the subs 106 and 108 are magnet assemblies 110 , 112 and 114 .
- The are vertically spaced from each other and separated by retainer rings 116 and 118 .
- the retainer rings 116 and 118 are split rings provided with locking members 120 for securing the magnets on the body 102 .
- the retainer rings 116 and 118 also help in retrieving of heavy shrapnel by creating a “stop,” thereby preventing a sliding and/or flushing effect.
- magnet assemblies 110 , 112 and 114 comprise a plurality of individual magnets 122 .
- the magnets 122 have “north” and “south” members, attracting variously charged metal cuttings.
- a portion of each magnet 122 fits into a specially provided slot 124 formed in the body 102 .
- each magnet 122 has a trapezoidal cross-section with slanted opposite ends 126 and 128 .
- a longer side 130 fits into the groove 124 .
- Each magnet 122 is provided with a “heel,” or magnet protector 132 .
- Each protector member 132 has a triangular cross-section with one side 134 of the protector being longer than the side of the magnet 122 positioned next to it.
- the slanted side 136 of the protector is angled in the direction of rotation of the tool 100 .
- This procedure is different from conventional methods, where a mule shoe first removes small particles and then cutting or milling is performed.
- the apparatus of the present invention allows performing several procedures in one step. It is possible to still use a cuttings boot basket, if desired for maximum removal of cuttings, although experiments performed with the apparatus of the present invention demonstrated a significantly high cutting removal rate.
- the tool of the present invention is particularly advantageous in horizontal or directional drilling where gravity-assisted cuttings collection is not available.
- the tool of the present invention by attracting the cuttings and holding them in “traps” facilitates a greater rate of cuttings removal than was available before.
- the number of individual magnets 122 in a magnet assembly can vary. Normally, four or five magnets work satisfactorily when equidistantly spaced about the circumference of the body 102 . During rotation of the tool 100 , the magnets provide an almost 360 degree coverage and create a strong magnetic field for attracting metal cuttings and miscellaneous items.
- the first step is usually to remove sand or small soil particles that accumulated on top of a packer.
- Using a drill stem to lower a circulating pipe with an angularly cut nozzle to the depth where the packer is located usually performs this step.
- the circulating air/fluids stream lifts up the sand, mixes it with the drilling mud solution and carries it to the surface.
- fluids that are more viscous may be used.
- the present invention also uses high viscous fluids. However, these fluids assist in moving the cuttings into the “traps.”
- the next conventional step is to use a milling tool that will cut away pieces of metal and allow the circulating fluid to carry them up to the surface.
- the tool of the present invention can be lowered into a wellbore together with the jet sub, as shown in FIG. 7 or with a milling bit, as shown in FIG. 6, thus eliminating one or even two steps of conventional methods.
- the tools 10 and 100 of the present invention may be used for any length of time in the well bore.
- a conventional “hydrostatic surge tool” must be retrieved and reset after a four- or five-time surge. It may take from 1 to 5 minutes to complete a surge cycle.
- a “hydrostatic surge tool” can retrieve large pieces of debris but it will not allow recovery of small cuttings and other metal pieces. Since conventional tools do not have circulating capabilities, they often becomes plugged with cuttings and miscellaneous debris, which prevents proper operation and creates a hazard in the event of a “kick” or “blow-out.” In contrast, the tool of the present invention, by allowing circulation, does not become plugged and will not hinder a well-killing operation.
- the size and number of the magnets 122 , as well as the number of magnet assemblies can vary, depending on the size of the drill string, the diameter of the annulus and the amount of cuttings to be retrieved. If desired, the magnets may be staggered or offset from each other in relation to the magnet assemblies to achieve maximum efficiency.
- the magnet member may be manufactured from ceramic or rare earth material, insulated and/or stainless steel coated to ensure a long service life.
- the tool of the present invention may be designed with magnets positioned on the interior wall of the central opening. The internal positioning will allow for reverse circulating retrieval of larger pieces of debris.
- the diameter of the tool may be reduced to run with wire-line or coiled tubing, if necessary, although larger scale tools may be produced based on the principles discussed above.
- the tool of the present invention may be successfully run with casing scrapers, scratchers and/or brush tools when conditioning of the well bore for production equipment takes place.
- the profile of the magnets positioned on the tool bodies assures 360-degree coverage with right-hand rotation.
- the tool will continue to work even when circulation stops and even in high temperature environment. Since the tool has no “skirts”, it may be successfully employed in perforated zones without the fear of hang-ups in cased holes or where casing has splintered.
- the tool connections have conventional sizes to allow connecting of the tool body with currently used drilling and work over equipment. Oversized tool joints create a centralizing effect and allow retrieval of cuttings and debris without being pulled off the tool during retrieval.
- the apparatus of the present invention may be successfully used for a number of operations, such as running above reverse circulation baskets to catch miscellaneous pieces, bearings, rings, etc.; for running with fishing magnets to retrieve various items from the wellbore; for running with a mule shoe to wash sand and recover miscellaneous items; for running with milling equipment to recover cuttings from a well bore.
- the latter type of use has an additional benefit of keeping the cuttings away from the milling bit to allow for more efficient milling operations.
- the tool of the present invention may be also used for running below a tubing conveyed perforating guns to recover shrapnel from the well bore, for running with J-latch or conventional overshot to recover miscellaneous items and retrieve packer plugs; for running with a jet sub for stirring miscellaneous debris and retrieving it to the surface, which allows recovery without wedging debris, as it happens when conventional equipment is used.
- the magnetic tools of the present invention can be also run in tandem in heavy milling and fishing operations. It can be successfully used for retrieval of various small tools and parts dropped accidentally into the well bore.
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Marine Sciences & Fisheries (AREA)
- Earth Drilling (AREA)
Abstract
Description
- The present invention relates to wellbore tools and more particularly to an apparatus for retrieval of metal objects, such as cuttings and other foreign objects that accumulate in the process of perforating or milling over bridge plugs and other down hole obstructions from a wellbore.
- Various types of bridge plugs are conventionally used in the oil and gas industry. These bridge plugs are installed in the annulus and are often covered in cement. Removal of such plugs can sometimes pose a problem for the industry. A rotary bit drills the cement and plugs out, while some of the cuttings of the plugs are carried out to the surface by a liquid circulated down hole.
- Sometimes, a production packer needs to be removed together with the metal pipe that it surrounds. In those cases, milling tools with gravity fed boot baskets are used for retrieving pieces of metal from the wellbore. After retrieval of the production packer, it may become necessary to run a conventional fishing magnet to retrieve additional junk and cuttings.
- A conventional fishing magnet is mounted inside a housing that is lowered into a wellbore. It is limited in the ability to retrieve cuttings in that its magnetization is restricted to the extreme bottom surface of the magnet. The fact that circulating fluids lift the cuttings away from the bottom surface of the magnet renders that conventional fishing magnet useless in this situation.
- Often times, a boot basket is used for collecting cuttings that did not attach themselves to the conventional magnet. A boot basket has small openings for catching these particles. Consequently, many large size pieces or very small pieces suspended in the fluid flow are not trapped in the basket and remain in the wellbore.
- The present invention contemplates elimination of drawbacks associated with the prior art and provision of a wellbore apparatus for removal of metal objects, such as cuttings, and other foreign particles that provides for the use of sets of magnets spaced longitudinally along the tool body.
- It is, therefore, an object of the present invention to provide an apparatus for retrieval of metal cuttings and other foreign objects from a wellbore.
- It is another object of the present invention to provide a packer-milling tool with magnets set in a spaced relationship longitudinally along the tool body to increase “catching” capacity of the tool.
- These and other objects of the invention are achieved through a provision of an apparatus for removal of metal cuttings and other foreign objects from a wellbore that uses at least two magnet assemblies vertically spaced from each other and mounted on the body of the tool. Each magnet assembly is comprised of a plurality of magnets encircling the body of the tool and covering a surface area greater than one half of the tool body.
- One of the embodiments of the invention provides for arcuate in cross section magnet members that are detachably secured on the tool body. The second embodiment provides for trapezoidal in cross section magnet members that extend longitudinally in parallel relationship to a central axis of the tool body. The tool of the second embodiment further provides for magnet protectors mounted adjacent to each magnet member. Each magnet protector has a triangular cross section and has a slanted surface that is angled in the direction of rotation.
- The space between each magnet and the next adjacent magnet protector forms a “trap” that receives and retains metal particles pushed away by the leading surface of the adjacent magnet member. Consequently, the capability of the tool to retain cuttings for subsequent retrieval to the surface is significantly increased in comparison with conventional magnet tools.
- Reference will now be made to the drawings, wherein like parts are designated by like numerals and wherein FIG. 1 is a side view of the packer removal tool of the present invention.
- FIG. 2 is a cross-sectional view of the magnet used in the tool of the present invention.
- FIG. 3 is a top view of the tool of the second embodiment of the present invention lowered into the wellbore.
- FIG. 4 is a detail view of the second embodiment of the present invention showing three vertically spaced magnet assemblies.
- FIG. 5 is a magnet profile suitable for use in the second embodiment of the present invention.
- FIG. 6 is a schematic view showing position of the apparatus of the present invention in combination with a conventional milling tool.
- FIG. 7 is a schematic view showing the apparatus of the present invention in combination with a ported jet sub for admitting a circulating fluid.
- Turning now to the drawings in more detail,
numeral 10 designates the well bore apparatus in accordance with the present invention. Theapparatus 10 comprises a generallycylindrical body 12 provided with a central through opening 14. The circulating fluids are admitted into thecentral opening 14 from anupper end 16 of thebody 12. - An
upper sub 18 is fixedly secured in circumferential relationship about thebody 12 adjacent theupper end 16, and a lower sub 20 is secured in circumferential relationship about thebody 12 adjacent alower end 22. Theupper sub 18 is provided withexternal threads 24 and thelower sub 26 is provided withinternal threads 28. Thethreads 24 allow connection of thetool 10 to abumper jar 30 schematically shown in FIGS. 6 and 7. Thebumper jar 30 is conventionally mounted on a drill string above the junk and cuttings removal tools. - The
internal threads 28 on thelower sub 26 can be used for attaching theapparatus 10 to ajet sub 32 for admitting circulating liquid into a wellbore 34 (FIG. 7). The liquid exits thejet sub 32 through one or more openings, orports 36 formed in thesub 32. Alternatively, theinternal threads 28 may be used for attaching thetool 10 to a boot basket 38 (FIG. 6). Theboot basket 38 conventionally carries at its lower end a milling tool 40 (FIG. 6). - Mounted between the
subs 18 and 20 are two sets ofmagnet assemblies upper magnet assembly 42 is vertically spaced from thelower magnet assembly 44. - Each
magnet assembly arcuate magnets 46 and 48 (FIG. 2) that are detachably secured to thebody 12 byscrews 50 or other similarly suitable means. When positioned on thebody 12, themagnets body 12. The magnet assemblies 42 and 44, occupying a large surface of thetool 10, allow retrieval of a significantly greater amount of metal pieces from thewellbore 34. - Turning now to the second embodiment of the present invention, the
tool 100 comprises a cylindrical body 102 having a through opening 104 for admitting circulating fluid into thewellbore 34. Anupper sub 106 hasexternal threads 108. Theupper sub 106 and alower sub 110 partially shown in FIG. 4) are used in a manner similar to that of thesubs - Mounted between the
subs magnet assemblies retainer rings 116 and 118. Theretainer rings 116 and 118 are split rings provided withlocking members 120 for securing the magnets on the body 102. Theretainer rings 116 and 118 also help in retrieving of heavy shrapnel by creating a “stop,” thereby preventing a sliding and/or flushing effect. - As can be seen in the drawings,
magnet assemblies individual magnets 122. Themagnets 122 have “north” and “south” members, attracting variously charged metal cuttings. A portion of eachmagnet 122 fits into a specially providedslot 124 formed in the body 102. As shown in FIG. 5, eachmagnet 122 has a trapezoidal cross-section with slantedopposite ends longer side 130 fits into thegroove 124. - Each
magnet 122 is provided with a “heel,” ormagnet protector 132. Eachprotector member 132 has a triangular cross-section with oneside 134 of the protector being longer than the side of themagnet 122 positioned next to it. Theslanted side 136 of the protector is angled in the direction of rotation of thetool 100. - When cuttings appear in an
annulus 140 of acasing 142 the magnet protectors tend to deflect the striking force of the metal cuttings away from the magnet surfaces and cause them to strike theinside wall 144 of thecasing 142. The cuttings are then pushed upwardly. The cuttings then attach themselves to themagnets 122 and can be carried to the surface when thetool 100 is retrieved. - Some of the cuttings fall between the
magnets 122 and they are caught in a trap that is formed between astraight side 146 of one magnet and theslanted face 136 of the next magnet protector. The cuttings accumulate within this trap space and are held there until milling is finished and thetool 100 is retrieved. The heel portion of the magnet protector acts as a “skid” to allow continues forcing of the cuttings into a magnetic field created by adjacent magnets. - This procedure is different from conventional methods, where a mule shoe first removes small particles and then cutting or milling is performed. The apparatus of the present invention allows performing several procedures in one step. It is possible to still use a cuttings boot basket, if desired for maximum removal of cuttings, although experiments performed with the apparatus of the present invention demonstrated a significantly high cutting removal rate.
- The tool of the present invention is particularly advantageous in horizontal or directional drilling where gravity-assisted cuttings collection is not available. The tool of the present invention, by attracting the cuttings and holding them in “traps” facilitates a greater rate of cuttings removal than was available before.
- The number of
individual magnets 122 in a magnet assembly can vary. Normally, four or five magnets work satisfactorily when equidistantly spaced about the circumference of the body 102. During rotation of thetool 100, the magnets provide an almost 360 degree coverage and create a strong magnetic field for attracting metal cuttings and miscellaneous items. - In conventional operations, the first step is usually to remove sand or small soil particles that accumulated on top of a packer. Using a drill stem to lower a circulating pipe with an angularly cut nozzle to the depth where the packer is located usually performs this step. The circulating air/fluids stream lifts up the sand, mixes it with the drilling mud solution and carries it to the surface. To increase lifting capability, fluids that are more viscous may be used. The present invention also uses high viscous fluids. However, these fluids assist in moving the cuttings into the “traps.”
- However, even fluids with high viscosity value are unable to lift up metal cuttings. Therefore, the next conventional step is to use a milling tool that will cut away pieces of metal and allow the circulating fluid to carry them up to the surface. The tool of the present invention can be lowered into a wellbore together with the jet sub, as shown in FIG. 7 or with a milling bit, as shown in FIG. 6, thus eliminating one or even two steps of conventional methods.
- By using a magnetic tool together with the milling bit the user effectively introduces the retrieval means directly into the working stream and facilitates immediate adherence of the cuttings to the magnets. Consequently, the time lost in removing the packer can be effectively minimized. The
tools - Even further, a “hydrostatic surge tool” can retrieve large pieces of debris but it will not allow recovery of small cuttings and other metal pieces. Since conventional tools do not have circulating capabilities, they often becomes plugged with cuttings and miscellaneous debris, which prevents proper operation and creates a hazard in the event of a “kick” or “blow-out.” In contrast, the tool of the present invention, by allowing circulation, does not become plugged and will not hinder a well-killing operation.
- The size and number of the
magnets 122, as well as the number of magnet assemblies can vary, depending on the size of the drill string, the diameter of the annulus and the amount of cuttings to be retrieved. If desired, the magnets may be staggered or offset from each other in relation to the magnet assemblies to achieve maximum efficiency. The magnet member may be manufactured from ceramic or rare earth material, insulated and/or stainless steel coated to ensure a long service life. - It is envisioned that the tool of the present invention may be designed with magnets positioned on the interior wall of the central opening. The internal positioning will allow for reverse circulating retrieval of larger pieces of debris.
- The diameter of the tool may be reduced to run with wire-line or coiled tubing, if necessary, although larger scale tools may be produced based on the principles discussed above. The tool of the present invention may be successfully run with casing scrapers, scratchers and/or brush tools when conditioning of the well bore for production equipment takes place.
- The profile of the magnets positioned on the tool bodies assures 360-degree coverage with right-hand rotation. The tool will continue to work even when circulation stops and even in high temperature environment. Since the tool has no “skirts”, it may be successfully employed in perforated zones without the fear of hang-ups in cased holes or where casing has splintered.
- The tool connections have conventional sizes to allow connecting of the tool body with currently used drilling and work over equipment. Oversized tool joints create a centralizing effect and allow retrieval of cuttings and debris without being pulled off the tool during retrieval.
- The apparatus of the present invention may be successfully used for a number of operations, such as running above reverse circulation baskets to catch miscellaneous pieces, bearings, rings, etc.; for running with fishing magnets to retrieve various items from the wellbore; for running with a mule shoe to wash sand and recover miscellaneous items; for running with milling equipment to recover cuttings from a well bore. The latter type of use has an additional benefit of keeping the cuttings away from the milling bit to allow for more efficient milling operations.
- The tool of the present invention may be also used for running below a tubing conveyed perforating guns to recover shrapnel from the well bore, for running with J-latch or conventional overshot to recover miscellaneous items and retrieve packer plugs; for running with a jet sub for stirring miscellaneous debris and retrieving it to the surface, which allows recovery without wedging debris, as it happens when conventional equipment is used. The magnetic tools of the present invention can be also run in tandem in heavy milling and fishing operations. It can be successfully used for retrieval of various small tools and parts dropped accidentally into the well bore.
- Due to a streamline design of the apparatus of the present invention, it can be washed over and retrieved with conventional fishing methods, if necessary. Such result cannot be achieved with conventional boot baskets that traditionally have oversized skirts. Cleaning of the tool of the present invention is relatively simple, and it can be run down hole again in a matter of minutes.
- Many changes and modification can be made in the design of the present invention without departing from the spirit thereof. I, therefore, pray that my rights to the present invention be limited only by the scope of the appended claims.
Claims (21)
Priority Applications (1)
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US09/789,876 US6308781B2 (en) | 1999-10-21 | 2001-02-21 | Apparatus for retrieving metal objects from a wellbore |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/422,423 US6216787B1 (en) | 1999-10-21 | 1999-10-21 | Apparatus for retrieving metal objects from a wellbore |
US09/789,876 US6308781B2 (en) | 1999-10-21 | 2001-02-21 | Apparatus for retrieving metal objects from a wellbore |
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US09/422,423 Continuation US6216787B1 (en) | 1999-10-21 | 1999-10-21 | Apparatus for retrieving metal objects from a wellbore |
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US20010013413A1 true US20010013413A1 (en) | 2001-08-16 |
US6308781B2 US6308781B2 (en) | 2001-10-30 |
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US09/602,379 Expired - Lifetime US6357539B1 (en) | 1999-10-21 | 2000-06-22 | Apparatus for retrieving metal objects from a wellbore |
US09/602,356 Expired - Lifetime US6354386B1 (en) | 1999-10-21 | 2000-06-22 | Apparatus for retrieving metal objects from a wellbore |
US09/789,876 Expired - Lifetime US6308781B2 (en) | 1999-10-21 | 2001-02-21 | Apparatus for retrieving metal objects from a wellbore |
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US09/602,379 Expired - Lifetime US6357539B1 (en) | 1999-10-21 | 2000-06-22 | Apparatus for retrieving metal objects from a wellbore |
US09/602,356 Expired - Lifetime US6354386B1 (en) | 1999-10-21 | 2000-06-22 | Apparatus for retrieving metal objects from a wellbore |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6655462B1 (en) * | 1999-05-29 | 2003-12-02 | Sps-Afos International Limited | Magnetic well cleaning apparatus |
WO2004057149A1 (en) * | 2002-10-29 | 2004-07-08 | Total Catcher Offshore As | Devices and methods for retrieving elements from wells |
US20070102161A1 (en) * | 2005-09-09 | 2007-05-10 | Gazewood Michael J | Magnetic fishing tool and method |
US7219724B2 (en) | 2004-07-15 | 2007-05-22 | Bilco Tools, Inc. | Downhole magnetic retrieval tool |
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Also Published As
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US6357539B1 (en) | 2002-03-19 |
US6354386B1 (en) | 2002-03-12 |
US6308781B2 (en) | 2001-10-30 |
US6216787B1 (en) | 2001-04-17 |
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