US3016830A - Junk shot - Google Patents

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US3016830A
US3016830A US797093A US79709359A US3016830A US 3016830 A US3016830 A US 3016830A US 797093 A US797093 A US 797093A US 79709359 A US79709359 A US 79709359A US 3016830 A US3016830 A US 3016830A
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sub
charge
bumper
pipe
tool
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US797093A
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Ii John Henry Kirby
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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
    • E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/02—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means
    • 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
    • E21B31/002—Destroying the objects to be fished, e.g. by explosive means

Definitions

  • This invention pertains to a device for breaking up material in a well bore that is interfering with the progress ofV drilling the well, such material being commonly referred to as junkf l
  • This application is a continuation of my prior application of the same name, Serial Number 548,878, tiled November 25, 1955.
  • the object of the invention is to provide a simple and eicient device for breaking up junk.
  • a further object of the invention is to provide such a device that can easily be brought into position adjacent the junk where it will be effective to break it up.
  • an explosive charge is connected to the lower end of a string of pipe, lowered into the well, and with the aid of fluid jets from the lower ⁇ end of the pipe adjacent the charge the latter is enabled to penetrate through the usual pile of cuttings and detritus at the bottom of the hole until it contacts the junk at thel bottom of the hole.
  • the charge is then detonated by means of an electric go-devil lowered inside the pipe on a wire line.
  • a further object of the invention is to protect the jets and detonation means as much as possible from the effect of the explosion of the charge whereby these parts of the apparatus can be used again.
  • FIGURE 1 is an axial section through the tool and the bottom of a well bore; and v FIGURE 2 is'an elevation, ⁇ partly in section, showing an ignition device used with the-tool.
  • FIGURE 1 there is shown the lower end of a well bore with a piece of junk such as a lost of broken drill bit 11 at the bottom of the bore.
  • a stringof pipe 12 whose lower end is providedV with a threaded socket or tool joint 13 which may be integral with the pipe as shown.
  • a drill collar 14 is screwed into the tool joint.
  • a tubular iringsub 15 which is of drill collar diameter.
  • a plurality of electrically conducting leaf springs v16 are screwed to a conducting ring 17 -which is set in a recess 18 in the threaded pin 19 of the upper end of the tiring ysub 15 and secured thereto by a threaded-pin 2 0. Near the lower end of the sub 15 there are a plurality of downwardly directed passages 21.
  • v sub has a slight inturned iiange or shoulder 22.
  • To the lower end of the tiring sub is connected a steel bumper sub 30 having an internally threaded socket 31.v
  • the upper end of the bumper sub j3i) abuts against the lower end of firing sub 15 and is provided with a tubular pin 32 which extends up into the lower part of tiring sub 15.
  • a lock washer 33 is disposed around pin 32 and rests on shoulder 22 of the firing sub.
  • a nut 34 is screwed to the threaded exterior of the upper end of pin 32 and rests on lock 'washer 33. By this means the bumper sub is held to the tiring sub.
  • the bumper sub has a slightly smaller outer diameter than the outer diameter of the tiring sub.
  • Thelower end of the tiring sub is bevelled at.35 where the passages 21 ,terminate and the upper part of the bumper sub .is bevelled The bottom of the firingv at 36. In this manner the passages 21 are directed downwardly as much as possible without their direction intersecting the bumper sub while still providing a bumper sub of large outer diameter to hold the explosive charge next to be described.
  • a charge housing 40 made of aluminum or other readily combustible or frangible material has an outer diameter equal to that of the bumper sub.
  • the upper end of charge housing 40 has a threaded pin 41 which ts into socket 31 in the lower end of the bumper sub.
  • an explosive charge 42 having a conical lower end 43 which shape directs downwardly a large proportion of the eiect of explosion of the charge.
  • the charge is retained within the housing 40 by means of an aluminum plug 44 held to the lower end of the housing by screws 45.
  • the lower face of plug 44 is tapered to a point 46 to facilitate penetration to the bottom of the well bore.
  • An electric tiring cap 5l is disposed adjacent the upper end of charge 42, being disposed in passage 51 in pin 41.
  • One electric contact at the upper end of the cap is soldered to the lower end of an electrically conducting brass rod 52 whose upper end is screwed into a steel point 53 forming an electric contact means.
  • an electrically insulating sleeve 54 disposed inside a steel tube 55. The latter extends through passage 51 and pin 32 up into the firing sub 15.
  • There is a ilange 56 on tube 55 which rests against the bottom of a counterbore 57 in the bumper sub 30 and is held thereagainst by the upper end of pin 41.
  • An O-ring 58 seals between tube 55 and passage 51.
  • a wire 59 is soldered to tube 55 and the other electric contact of electric tiring cap 50.
  • FIGURE 2 there is shown a tiring device adapted to be lowered on a wire line 70 into the chamber 71 inside the tiring sub 15 to set ott charge 42.
  • Thering device comprises a rope socket 72 connecting ythe wire line to a lishing neck 73 which is screwed into theV top of a go devil or sinker bar 74.
  • the lower end of the sinker bar is screwed into the top end of tubular battery chamber 76 in which is disposed an electrically insulating sleeve 77 and a plurality of dry cells 78 disposed with vtheir .contact pins 79 extending down.
  • the dry cellsA are supported at their lower end by electrically insulating bushing 80 secured into the lower end of chamber 76 and a contact pin 81 screwed into bushing 80 and engaging contact pin 79 of the lowerrnost dry cell.
  • the explosion breaks up junk 11 into small frag-V ments which can be recovered with conventional fishing tools,I such as a permanent-magnet shing tool.
  • the explosion also destroys aluminum housing 441 which is i powdered or vaporized so as to leave no additional junk in the well bore.
  • the bumper sub is deformed so as not to be reuseable but will usually be retained on the lower end f the firing sub so that it can be easily retrieved.
  • the bumper sub acts as a shock absorber to protect the firing sub so that it is undamaged and can be reusedln While a preferred embodiment of the invention has been shown and described, many modifications thereof can'be made by one skilled in the art without departing from the spirit of the invention and it is desired to protect by Letters Patent all forms of the invention falling. within the scope of the following claims.
  • a tool adapted to be run on the end of a string' of l pipe for breaking up junkin a' well bore comprising a ⁇ charge housing means readily disintegrated by the explosion of the contained charge containing an explosive charge shaped to direct the force of itsexplosion downwardly, said housing being closed at both ends except for a passageway through the upper end thereof, a bumper sub means that will integrally survive an explosion and having an outer' diameter as large asthe' charge housing means connected to the upper end of the'V charge housing means and shielding the upper parts of the tool from the effects of explosion of the charge, said bumper sub being of short axial lengthcompared to said charge housing means, said bumper sub having a passageway therethrough connecting with said passageway in the upper end of said charge housing means, means in said passageways for setting off said charge including an electric conductor extending upwardly from the upper end of said ⁇ bumper sub and an electric detonator having one terminal connected to said conductor and the other terminal grounded, a firing sub connected to said bumper sub, said firing sub having an axial passage therein
  • a tool adapted to be run on the end of a string of pipe for breaking up junk in a well bore comprising a tubular charge housingmeans having upper and'lower ends and including means closing the upper and lower ends thereof, an explosive Vcharge disposed in said housing and shaped to direct the blast of its explosion downwardly, and means connected to's'aid charge' housing means for connecting said charge housing means' to such astring of pipe and including downwardly directed fluid 'passage means for' conveying fluid from said pipe tothe outside of said charge housing means and for directing 'such fluid downwardly along the outside of said housingl means, the passage formed between said tubular housing means' and the well bore that exists when the tool is run into a well bore conveying the fluid to the region beneath said housing means tov wash detritus away fromjunk in the welll -bore beneath the tool and enable'the explosive charge to be positioned closely thereabove whereby the downward blast of the explosion of the 'charge will act directly onl the junk, and means for setting od the explosion of said charge,
  • a tool adapted to be run on a string of pipe for breaking up; junk in a ⁇ well bore comprising housing means for containingV an explosive charge and disintegrati'ngjfully after' the explosion of said charge, bumper means connected to one end of said housing means made of material such that the bumper means survivesv explosion of such charge, fluid discharge means connected to said bumper means ony the opposite side thereof from said charge housing means, said bumper means being' of kas large a diameter as said charge housing means and serving as abuffer between said fluid discharge means and said charge housing means, an explosive charge disposed' in said housing means, said charge being shaped to concentrate the blast of its explosion in a direction away from 'said bumper means, said ⁇ fluid discharge means being connectable to said pipe to convey fluid from the interior of the pipe to the exterior of the tool and including passage means directing fluid past said bumper means toward said charge housing means in the same generall direction as the blast from explosion of said charge, whereby junk in the well berel can be cleared of detritus by fluidforced down said string of pipe and through
  • a tool adapted to be run on the end of a string of pipe for breaking up junk in a well bore comprising a charge housing means readily disintegrated by the explosion of the contained charge containing an explosive charge shaped to direct the force of its explosion downwardly, said housing means being closed at both ends except for a passageway through the upper end thereof, an electrically actuated detonator disposed in said passageway close to the upper portion of said explosive charge, a bumper sub that will integrally survive an explosion and having an outer diameter as large as the charge housing means connected to the upper end of the charge housing means and shielding the upper parts of the tool from the eiects of explosion of the charge, said bumper sub being of short axial length compared to said charge housing means, said bumper sub having a passageway therethrough connecting with said passageway in the upper end of said charge housing means, a i'lring sub connected to said bumper sub, said firing sub having an axial passage therein open at its upper end for the entrance of well uid and to receive an electric godevil, the lower
  • a tool adapted to be run in a well on a string of pipe comprising a hollow charge housing made of material that will be'reduced by an explosion to a drillable state and containing an explosive charge shaped to direct the main blast of its explosion downwardly ytoward the well bottom, said housing further'containing a detonator for said explosive charge, means for connecting the charge housing to the string of pipe, said connecting means having a fluid passage therethrough communicating at its upper end with the interior of the pipe and atits lower end by means of a downwardly directed portion with the space exterior of the tool forming the annulus between the tool and well when the tool is in the well whereby uid can be circulated down inside the pipe through the tool into the annulus, said connecting means including a firing sub adapted to contain an electric power means, electric contact means in said iiring sub, and means electrically connecting said contact means to said detonator, the improvement according to which said iring sub is open at the top to receive said electric power means as part of an electric ,go-de
  • a tool adapted to be run on the lower end of a string of pipe for breaking up junk in a well bore comprising:
  • said housing means disposed below said sub means and containing an explosive charge shaped to direct the force of the explosion downwardly and disposed with the bottom of the charge adjacent the bottom of said housing means and the top end of the charge adjacent the top of said housing means, Y p said housing means also containing a detonator and being closed at both ends except for: a passage through'the upper end leading to the detonator and being made of material readily disintegrated by the detonationof the contained charge, and
  • a bumper sub connected to and interposed between Y the top of said charge housing means and the bottom of said connecting sub means and made ofmaterial that will integrally survive an explosion and having a vertical extent that is short compared to the vertical extent of said charge placing the lower end of said jet forming portion of the fluid passage means close to the charge housing means and having horizontal dimensions inall directions as large as said charge housing means to shield the portion of the tool thereabove from the effects of the detonation of the charge.

Description

Jan. 16, 1962 .1. H. KIRBY u 3,016,830
JUNK SHOT Original Filed Nov. 25, 1955 United tates Patent @hhs Y 3,016,830 Patented Jan. Y16, 1952 tmb Continuation of application Ser. No. 548,878, Nov. 25, 1955. This application Mar. 4, 1959, Ser. No.
6 Claims. (Cl. 162-20) This invention pertains to a device for breaking up material in a well bore that is interfering with the progress ofV drilling the well, such material being commonly referred to as junkf l This application is a continuation of my prior application of the same name, Serial Number 548,878, tiled November 25, 1955.
The object of the invention is to provide a simple and eicient device for breaking up junk.
A further object of the invention is to provide such a device that can easily be brought into position adjacent the junk where it will be effective to break it up.
According to the invention, an explosive charge is connected to the lower end of a string of pipe, lowered into the well, and with the aid of fluid jets from the lower` end of the pipe adjacent the charge the latter is enabled to penetrate through the usual pile of cuttings and detritus at the bottom of the hole until it contacts the junk at thel bottom of the hole. The charge is then detonated by means of an electric go-devil lowered inside the pipe on a wire line. 'f
A further object of the invention is to protect the jets and detonation means as much as possible from the effect of the explosion of the charge whereby these parts of the apparatus can be used again.
Other objects and advantages of the invention will appear from the following description" of a preferred embodiment thereof, reference being made to the accom- Vpanying drawings wherein:
FIGURE 1 is an axial section through the tool and the bottom of a well bore; and v FIGURE 2 is'an elevation, `partly in section, showing an ignition device used with the-tool.
Referring to FIGURE 1, there is shown the lower end of a well bore with a piece of junk such as a lost of broken drill bit 11 at the bottom of the bore. Within the well bore is a stringof pipe 12 whose lower end is providedV with a threaded socket or tool joint 13 which may be integral with the pipe as shown. A drill collar 14 is screwed into the tool joint. In the lower end of the drill collar is screwed a tubular iringsub 15 which is of drill collar diameter. Y l
A plurality of electrically conducting leaf springs v16 are screwed to a conducting ring 17 -which is set in a recess 18 in the threaded pin 19 of the upper end of the tiring ysub 15 and secured thereto by a threaded-pin 2 0. Near the lower end of the sub 15 there are a plurality of downwardly directed passages 21. v sub has a slight inturned iiange or shoulder 22. To the lower end of the tiring sub is connected a steel bumper sub 30 having an internally threaded socket 31.v The upper end of the bumper sub j3i) abuts against the lower end of firing sub 15 and is provided with a tubular pin 32 which extends up into the lower part of tiring sub 15. A lock washer 33 is disposed around pin 32 and rests on shoulder 22 of the firing sub. A nut 34 is screwed to the threaded exterior of the upper end of pin 32 and rests on lock 'washer 33. By this means the bumper sub is held to the tiring sub. i
The bumper sub has a slightly smaller outer diameter than the outer diameter of the tiring sub. Thelower end of the tiring sub is bevelled at.35 where the passages 21 ,terminate and the upper part of the bumper sub .is bevelled The bottom of the firingv at 36. In this manner the passages 21 are directed downwardly as much as possible without their direction intersecting the bumper sub while still providing a bumper sub of large outer diameter to hold the explosive charge next to be described.
A charge housing 40 made of aluminum or other readily combustible or frangible material has an outer diameter equal to that of the bumper sub. The upper end of charge housing 40 has a threaded pin 41 which ts into socket 31 in the lower end of the bumper sub. Inside the charge housing 40 is disposed an explosive charge 42 having a conical lower end 43 which shape directs downwardly a large proportion of the eiect of explosion of the charge. The charge is retained within the housing 40 by means of an aluminum plug 44 held to the lower end of the housing by screws 45. The lower face of plug 44 is tapered to a point 46 to facilitate penetration to the bottom of the well bore.
An electric tiring cap 5l) is disposed adjacent the upper end of charge 42, being disposed in passage 51 in pin 41. One electric contact at the upper end of the cap is soldered to the lower end of an electrically conducting brass rod 52 whose upper end is screwed into a steel point 53 forming an electric contact means. Around the rod 572 is an electrically insulating sleeve 54 disposed inside a steel tube 55. The latter extends through passage 51 and pin 32 up into the firing sub 15. There is a ilange 56 on tube 55 which rests against the bottom of a counterbore 57 in the bumper sub 30 and is held thereagainst by the upper end of pin 41. An O-ring 58 seals between tube 55 and passage 51. A wire 59 is soldered to tube 55 and the other electric contact of electric tiring cap 50.
Referring now to FIGURE 2, there is shown a tiring device adapted to be lowered on a wire line 70 into the chamber 71 inside the tiring sub 15 to set ott charge 42. Thering device comprises a rope socket 72 connecting ythe wire line to a lishing neck 73 which is screwed into theV top of a go devil or sinker bar 74. There are a plurality of electrically conducting belly springs 75 secured to the outside of the sinker bar which serve both to ground the firing device to the tiring sub and to center the tiring device in its passage down the drill pipe into the firing sub. v
The lower end of the sinker bar is screwed into the top end of tubular battery chamber 76 in which is disposed an electrically insulating sleeve 77 and a plurality of dry cells 78 disposed with vtheir .contact pins 79 extending down. The dry cellsA are supported at their lower end by electrically insulating bushing 80 secured into the lower end of chamber 76 and a contact pin 81 screwed into bushing 80 and engaging contact pin 79 of the lowerrnost dry cell. Electrically conducting compression spring 82 disposed between the top of the uppermost dry cell and the pin on the lower end of the sinker bar keeps the dry cells yin contact with each other and connects the metal bottom formingone contact of the toprnost cell to the sinker bar and battery chamber.
to the ring sub, thereby closing acircuit from the dry cells through the electric tiring cap 56 to set ofcharge 42. The explosion breaks up junk 11 into small frag-V ments which can be recovered with conventional fishing tools,I such as a permanent-magnet shing tool. The explosion also destroys aluminum housing 441 which is i powdered or vaporized so as to leave no additional junk in the well bore. The bumper sub is deformed so as not to be reuseable but will usually be retained on the lower end f the firing sub so that it can be easily retrieved. The bumper sub acts as a shock absorber to protect the firing sub so that it is undamaged and can be reusedln While a preferred embodiment of the invention has been shown and described, many modifications thereof can'be made by one skilled in the art without departing from the spirit of the invention and it is desired to protect by Letters Patent all forms of the invention falling. within the scope of the following claims.
I claim:
l. A tool adapted to be run on the end of a string' of l pipe for breaking up junkin a' well bore comprising a `charge housing means readily disintegrated by the explosion of the contained charge containing an explosive charge shaped to direct the force of itsexplosion downwardly, said housing being closed at both ends except for a passageway through the upper end thereof, a bumper sub means that will integrally survive an explosion and having an outer' diameter as large asthe' charge housing means connected to the upper end of the'V charge housing means and shielding the upper parts of the tool from the effects of explosion of the charge, said bumper sub being of short axial lengthcompared to said charge housing means, said bumper sub having a passageway therethrough connecting with said passageway in the upper end of said charge housing means, means in said passageways for setting off said charge including an electric conductor extending upwardly from the upper end of said` bumper sub and an electric detonator having one terminal connected to said conductor and the other terminal grounded, a firing sub connected to said bumper sub, said firing sub having an axial passage therein open at its upper end, the lower end of said passage being' closed by said bumper sub and receiving the upper end of saidV electric conductor, said firing sub having a plurality of azimuthally spaced apart elongated passages each connected to said axial passage at one end and extending downwardly and outwardly at an acute angle to the axis of the firing sub and opening to the outside of the tool just above and radially clear of the upper end of the bumper sub, means carried by the firing sub for grounding an electric go-devil received in the firing sub, and means for connectingv the upper end of the firing sub to a string of pipe, whereby' the to'ol can be brought into effective position adjacent a target in the bottom of a hole by the combined action of the weight of the string of pipe and the action of fluid under pressure passing down through the pipe string and out through said azimuthally spaced apart passages in the firing sub immediately above the bumper sub and charge housing v means and said chargefcan then be exploded to act on the target following which the firing sub and bumper sub. can be withdrawn and the bumper sub removed and the remainder of the tool reused.V
2, A tool adapted to be run on the end of a string of pipe for breaking up junk in a well bore comprising a tubular charge housingmeans having upper and'lower ends and including means closing the upper and lower ends thereof, an explosive Vcharge disposed in said housing and shaped to direct the blast of its explosion downwardly, and means connected to's'aid charge' housing means for connecting said charge housing means' to such astring of pipe and including downwardly directed fluid 'passage means for' conveying fluid from said pipe tothe outside of said charge housing means and for directing 'such fluid downwardly along the outside of said housingl means, the passage formed between said tubular housing means' and the well bore that exists when the tool is run into a well bore conveying the fluid to the region beneath said housing means tov wash detritus away fromjunk in the welll -bore beneath the tool and enable'the explosive charge to be positioned closely thereabove whereby the downward blast of the explosion of the 'charge will act directly onl the junk, and means for setting od the explosion of said charge, said tool being further characterized by the fact that the means for connecting the charge housing means to the string of pipe and including downwardly directed fluid passage means includes a drill collar adapted to be connected to the lower end of the string of pipe and a tubular firing sub connected to the lower end of the drill collar having the same inner and outer diameters as the drill collar providing a thick wall in the lower part of which are disposed said downwardly directed fluid passage means and providing a central chamber adapted to receive an electric go-devil of the largest diameter that will pass through said drill collar after said go-devil has downwardly traversed the interior of the string of pipe Vto'which the tool is connected, the means for setting off an explosion of said charge including resilient electricl contact means around the upper part of said central charnber of Asaid sub and extendingy inwardly therefrom to .en-I gage the go-devil, lsaid tool being further characterized by the fact that the charge housing means is made of readily destructible' material that is reduced by the explosion of the charge toa form compatible with continued drilling in the well bore and in which there isinterposed between the charge housing means and the firing sub a bumper means of durable material that will survivev the explosion of thecharge, said bumper means being of short axial extent compared to the length of said tubular charge housing means, the said fluid passage means in the lower part of the firing sub terminating at the lower end of the firing sub where it engages said bumper means, the' outer'diameter of the bumper means being less than that of said firing sub, the bumper means being substantallyclear of the path of fluid emerging from said fluid passages in the firing sub, the outer diameter of said bumper means being as large as that of said charge housing' meansto protect the firing sub from explosion of said charge.
3. A tool adapted to be run on a string of pipe for breaking up; junk in a` well bore comprising housing means for containingV an explosive charge and disintegrati'ngjfully after' the explosion of said charge, bumper means connected to one end of said housing means made of material such that the bumper means survivesv explosion of such charge, fluid discharge means connected to said bumper means ony the opposite side thereof from said charge housing means, said bumper means being' of kas large a diameter as said charge housing means and serving as abuffer between said fluid discharge means and said charge housing means, an explosive charge disposed' in said housing means, said charge being shaped to concentrate the blast of its explosion in a direction away from 'said bumper means, said` fluid discharge means being connectable to said pipe to convey fluid from the interior of the pipe to the exterior of the tool and including passage means directing fluid past said bumper means toward said charge housing means in the same generall direction as the blast from explosion of said charge, whereby junk in the well berel can be cleared of detritus by fluidforced down said string of pipe and through said fluid discharge means and the charge housing means positioned closely VadjacentV the junk with the shaped charge directed thereagainst, and means for set-V tingV off an explosion ofl said charge, said meansfor setting off an explosion of the charge including means forming a passage through'the end of saidl charge housing means adjacent said bumper means and thence through said bumper means into an interior space in said fluid discharge means', an elongated unit disposed in said pas'- Vin said fluid discharge means to provide at its end an "v 'electric contact, the outermost of saidY concentric con ductors having a ange thereon held between and in electrical contact with said bumper means and said end of said charge housing means, said uid discharge means and Ibumper means being made of electrically conductive material, and resilient electrical conductor means around the interior of said space in said fluid discharge means providing an electrical contact positioned farther from said bumper means than said electrical contact provided by the end of said innermost conductor, said interior space in said uid dischargemeans opening at the end thereof farther from said bumper means to communicate with the interior of the pipe on which the too=l is run, whereby an electric go-devil can be dropped throughsaid pipe into said space to engage said contacts and set od an explosion of said charge.
4. A tool adapted to be run on the end of a string of pipe for breaking up junk in a well bore comprising a charge housing means readily disintegrated by the explosion of the contained charge containing an explosive charge shaped to direct the force of its explosion downwardly, said housing means being closed at both ends except for a passageway through the upper end thereof, an electrically actuated detonator disposed in said passageway close to the upper portion of said explosive charge, a bumper sub that will integrally survive an explosion and having an outer diameter as large as the charge housing means connected to the upper end of the charge housing means and shielding the upper parts of the tool from the eiects of explosion of the charge, said bumper sub being of short axial length compared to said charge housing means, said bumper sub having a passageway therethrough connecting with said passageway in the upper end of said charge housing means, a i'lring sub connected to said bumper sub, said firing sub having an axial passage therein open at its upper end for the entrance of well uid and to receive an electric godevil, the lower end of said passage being closed by said bumper sub except for said passageway through said bumper sub which terminates at its upper end inside said axial passage in said tiring sub, said firing sub having a plurality of azimuthally spaced apart elongated passages each connectedrto said axial passage at one end and extending downwardly and outwardly at an acute angle to the axis of the firing sub and opening to the outside of the tool just above and radially clear of the upper end of the bumper sub, electric conducting means connected to said detonator and extending through said passageways in the charge housing and bumper sub into said axial passage in said tiring sub, said electric conducting means terminating at its upper end in electric con- Y' tact means for engagement with said electric go-devil, and means for connecting the upper end of the tiring sub to -a string of pipe, whereby the tool can be brought into effective position adjacent a target inthe bottom of a hole by the combined actionV of the weight of the string of pipe and the action of Huid under pressure passing down through the pipe string and out'through said azi-V muthally spaced apart passages in the tiring sub immediately` above the bumper sub and charge housing means and said charge can then be exploded to act on the target following which the firing sub and bumper sub can be withdrawn and the bumper `sub removed andthe remainder of the tool reused. v j
5. In a tool adapted to be run in a well on a string of pipe comprising a hollow charge housing made of material that will be'reduced by an explosion to a drillable state and containing an explosive charge shaped to direct the main blast of its explosion downwardly ytoward the well bottom, said housing further'containing a detonator for said explosive charge, means for connecting the charge housing to the string of pipe, said connecting means having a fluid passage therethrough communicating at its upper end with the interior of the pipe and atits lower end by means of a downwardly directed portion with the space exterior of the tool forming the annulus between the tool and well when the tool is in the well whereby uid can be circulated down inside the pipe through the tool into the annulus, said connecting means including a firing sub adapted to contain an electric power means, electric contact means in said iiring sub, and means electrically connecting said contact means to said detonator, the improvement according to which said iring sub is open at the top to receive said electric power means as part of an electric ,go-devil run in through said pipe, said downwardly directed portion of the fluid passage is elongated and extends from the interior of said tiring sub all the way to the exterior of tbe tool to form the uid leaving said passage into a jet stream directed downwardly toward the well bottom, the distance between the lower end of said portion and the upper end of said explosive is short compared to the length of said charge, the distance between the bottom of said charge and the lower end of said chargerhousing is short compared to the length of said charge, and said connecting means further includes a shielding means provided by a bumper sub of as large transverse dimensions as the charge housing, said shielding means being connected between said charge housing and said firing sub, said means electrically connecting said contact means to said detonator means extending through said bumper sub, said bumper sub being of short length compared to the length of said charge.
6. A tool adapted to be run on the lower end of a string of pipe for breaking up junk in a well bore comprising:
sub means for connecting the tool to the string of pipe and providing fluid passage means communieating with the interior of the pipe and including an elongated downwardly directed restricted portion communicating at the lower end of the sub means with the space exterior of the tool that forms the annulus between the tool and well wall when the tool is in the well for forming iiuid leaving said elongated portion into a downwardly directed jet stream,
charge housing means disposed below said sub means and containing an explosive charge shaped to direct the force of the explosion downwardly and disposed with the bottom of the charge adjacent the bottom of said housing means and the top end of the charge adjacent the top of said housing means, Y p said housing means also containing a detonator and being closed at both ends except for: a passage through'the upper end leading to the detonator and being made of material readily disintegrated by the detonationof the contained charge, and
a bumper sub connected to and interposed between Y the top of said charge housing means and the bottom of said connecting sub means and made ofmaterial that will integrally survive an explosion and having a vertical extent that is short compared to the vertical extent of said charge placing the lower end of said jet forming portion of the fluid passage means close to the charge housing means and having horizontal dimensions inall directions as large as said charge housing means to shield the portion of the tool thereabove from the effects of the detonation of the charge.
US797093A 1959-03-04 1959-03-04 Junk shot Expired - Lifetime US3016830A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800705A (en) * 1973-03-30 1974-04-02 J Tamplen Pressure balanced percussion firing system
US5699867A (en) * 1996-06-10 1997-12-23 Ingersoll-Rand Company Bit retention device for a bit and chuck assembly of a down-the-hole, percussive drill
US9644925B1 (en) * 2014-06-19 2017-05-09 The United States Of America As Represented By The Secretary Of The Army Explosive device for breaching doors and walls
US9719331B2 (en) 2012-05-13 2017-08-01 Alexander H. Slocum Method and apparatus for bringing under control an uncontrolled flow through a flow device
GB2569029A (en) * 2017-10-24 2019-06-05 Spex Corp Holdings Ltd Penetrating tool

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058287A (en) * 1936-07-03 1936-10-20 Anderson Alexander Bore hole device and method of its use
US2293259A (en) * 1941-03-25 1942-08-18 Acme Fishing Tool Company Device for preventing clogging of drilling bits
US2760408A (en) * 1953-05-19 1956-08-28 Johnston Testers Inc Firing head
US2869825A (en) * 1953-10-26 1959-01-20 Phillips Petroleum Co Earth boring
US2876843A (en) * 1954-08-23 1959-03-10 Jersey Prod Res Co Gun perforator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058287A (en) * 1936-07-03 1936-10-20 Anderson Alexander Bore hole device and method of its use
US2293259A (en) * 1941-03-25 1942-08-18 Acme Fishing Tool Company Device for preventing clogging of drilling bits
US2760408A (en) * 1953-05-19 1956-08-28 Johnston Testers Inc Firing head
US2869825A (en) * 1953-10-26 1959-01-20 Phillips Petroleum Co Earth boring
US2876843A (en) * 1954-08-23 1959-03-10 Jersey Prod Res Co Gun perforator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800705A (en) * 1973-03-30 1974-04-02 J Tamplen Pressure balanced percussion firing system
US5699867A (en) * 1996-06-10 1997-12-23 Ingersoll-Rand Company Bit retention device for a bit and chuck assembly of a down-the-hole, percussive drill
US9719331B2 (en) 2012-05-13 2017-08-01 Alexander H. Slocum Method and apparatus for bringing under control an uncontrolled flow through a flow device
US10513912B2 (en) 2012-05-13 2019-12-24 Alexander Henry Slocum Method and apparatus for bringing under control an uncontrolled flow through a flow device
US9644925B1 (en) * 2014-06-19 2017-05-09 The United States Of America As Represented By The Secretary Of The Army Explosive device for breaching doors and walls
GB2569029A (en) * 2017-10-24 2019-06-05 Spex Corp Holdings Ltd Penetrating tool
GB2569029B (en) * 2017-10-24 2020-07-15 Spex Corp Holdings Ltd Penetrating tool

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