US2266739A - Well fishing tool - Google Patents
Well fishing tool Download PDFInfo
- Publication number
- US2266739A US2266739A US313749A US31374940A US2266739A US 2266739 A US2266739 A US 2266739A US 313749 A US313749 A US 313749A US 31374940 A US31374940 A US 31374940A US 2266739 A US2266739 A US 2266739A
- Authority
- US
- United States
- Prior art keywords
- prongs
- tool
- downwardly
- well
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000036346 tooth eruption Effects 0.000 description 1
- 238000003466 welding 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/08—Fishing for or freeing objects in boreholes or wells using junk baskets or the like
Definitions
- This invention relates to oil well equipment and more particularly to a shing tool for removing lost objects from a well.
- Another object is to provide a fishing tool so constructed that the sh engaging or article recovery mechanism will occupy little space when set for a sh removing operation thereby enabling the same to not only engage larger objects than heretofore possible, but have greater capacity.
- a further object is to provide a ilshing tool of the character described constructed in such a manner than a basketlike structure is formed when the tool is operated thereby collecting both small and large objects and retaining the same while the tool is being removed from the well.
- a still further object is to provide a well llshing tool that is of simple and economical construction which may be readilyr operated to recover lost articles in a well.
- FIG. 1 is a vertical section taken through the improved fishing tool in a well hole showing the parts as they appear prior to a tlsh engaging operation.
- Fig. 2 is a fragmentary section similar to Fig. 1 showing them as they appear after the catcher has been operated.
- Fig. 3 is an enlarged perspective view in section of the catcher.
- Fig. 4 is a horizontal section taken on line 4-4 of Fig. 3, but showing the catcher as it appears after being operated.
- Fig. 5 is a detail section taken on line 5-5 of Fig. 4.
- drawing IIJ generally designates the improved shing tool disposed in a well H, in the present instance it is shown connected through a tool joint T to a string of drill pipe D.
- the tool may be connected to a steel cable or sand line and operated by a set of jars connected thereto in a manner hereinafter described.
- the article recovery mechanism or catcher I4 which is operated through engagement with the head I5 of a plunger I6 square shaped in cross section slidably mounted in a correspondingly shaped opening formed in a plug Il connected to the upper end of the tubular casing I2.
- y I Plug I'I is provided with a plurality of flui circulating openings I8 while the bar I6 has a uid passage I9 therethrough for the circulating mud and is provided with a pin 20 for connection with the box 2
- 'I'he article recovery mechanism I4 consists of a base member 22 having an internal concave face 23 and an upper member 24 having a convex face 25 mounted thereon which when assembled form an annular arcuate channel or guide Way indicated at 26 which serves to bend or turn inwardly a plurality of prongs or flat fingers 21 when the mechanism is operated.
- the upper member 24 has a lateral ange 28 in which is formed a plurality of slots 30 into which project the pointed ends 3
- Prongs 2l are preferably formed' of a pliable material such as sheet steel employed in die stamping operations, and are secured at their upper ends to a ring 34 preferably by welding as indicated at 35, it being noted that the prongs are curved in cross section on a radius corresponding to the slots 30 in order to add strength to the same after they have been bent into a fish engaging position as shown in Fig. 2.
- a row of teeth 22a which serve to penetrate the formation and loosen any earthy material that may have settled around the fish on the bottom of the hole, the tool being rotated and circulating fluid pumped therethrough at this time.
- the head I5 of the plunger is held out of engagement with the mechanism I4 after assembling until it is desired to operate the same by a sheer pin 36 that is mounted in the. wall of tube l2 the projecting end being disposed in a recess 3l formed in the side wall oi' the head.
- the improved fishing tool is connected to the drill pipe T and lowered into the well until it rests on the bottom, if the ilsh"cr other lost objects have become embedded below accumulated earthy cuttings, the drill pipe then connected with a hydraulic swivel and pipe rotated until the earthy material has become loosened suiiiciently to permit the prongs o! the apparatus to be disposed beneath the ilsh.
- the draw works brake (not shown) is then released whereupon the dead weight of the drill pipe on its downward movement causes the head l1 on bar I6 of the plunger to engage the ring 2l and force it downwardly, such action bending the prongs 21 and closing them around the Ilsh, due to the curvature of the channel or guideway 26.
- the fishing tool When removing sh that have not 'been in the well hole for any great length of time or have not become covered with sand or other earthy material the fishing tool is adapted to be connected to a steel cable or sand line with a set of jars (not shown) connected to the pin 2
- the tool IU is removed from the Well, the catcher Il is discharged of the recovered ilsh after which the tool is reset for another operation. This is accomplished by placing the catcher i4 over or inserting a bar into it of such diameter that it will pass through ring 34 and engage the face of ilange 28, then holding the ring stationary and pushing on the bar or vice versa the action of which separates the ring from the base members 22 and at the same time straightens the prongs 21. 'I'he prongs may then be inserted in the ascenso nected to said mst-mentioned, member. and a plunger movable downwardly within said tubular member to engage said mormting member and force said prongs down through said channel, whereby they will be bent to e radially across said central opening to form article holding structure.
- An apparatus of the class described comprising a base member having a central opening and a downwardly converging concave surface, anuppermemberhavingaiiangesecuredtosaid base member and a downwardly converging convex surface spaced inwardly from said concave surface to form a downwardly and inwardly curving channel, an annular member having a plurality o! bendable prongs detachably secured thereto. the free ends oi said prongs projecting downwardly into said channel, a tubular member connected to and extending upwardly from said base member, -a plug secured to the upper.
- a plunger slidably mounted in said plug and movable downwardly in said tubular member into engagement with said annular member to force said prongs through said channel, whereby they will be bent to extend'radially across said central opening to form an article holding structure, said annular member engaging said upper member to limit the radial projection of said prongs across said opening.
- An apparatus of the class described comprising a member having a plurality of vertical circularly spaced bendable prongs, a base member having a downwardly converging circumferentially continuous channel formed therein into which the free ends of said prongs project, a tubular casing detachably connected to said base member, a plug detachably secured to the upper end oi.' said tubular member, a plunger slidably mounted in said plug, a plunger head secured to said plunger and movable downwardly within said tubular member into engagement with said prong member to'force the prongs bend them toward each other to form an article engaging structure.
- a fishing tool for wells comprising a member having a central opening and a downwardly converging surface, a second member having a downwardly converging surface opposed to said rstmentioned surface and spaced therefrom to form a circumferentially continuous annular channel, a plurality of circularly spaced bendable prongs having their free ends extending downwardly into said channel, a mounting member to which said prongs are secured, a tubular member con- 4.
- a shing tool for wells comprising a cylindrical base member having a central opening in its lower end and a downwardly converging inner surface with an annular row of cutting teeth therebelow, a companion member having a downwardly convering surface opposed to said base member and spaced therefrom to form a circumferentially continuous channel therebetween detachably secured to said base member, a plurality of bendable spaced prongs having their free ends engaging the channel formed between the base and vsaid companion member, an annular mounting member to which said prongs are secured, a tubular member connected to said base member, a plug connected to the upper end of said tubular member, and a plunger splined to said plug to rotate the tubular member and force the prongs downwardly through the channel whereby to bend and force them to extend across the central opening of the circular member to form an article -holding structure.
- An oil well shing tool comprising a tubular casing, a circular member having a central opening and a downwardly converging surface detachably secured to the lower end of said casing, a second circular member detachably secured to said first mentioned member having a downwardly converging surface and spaced therefrom to form a circumferentially continuous annular channel, an annular independently removable v guidingly deform the same inwardly into over-l prong mounting member havingva plurality of bendable prongs secured thereto, their free ends engaging the circumferential annular channel formed by the circular members, and a plunger movable downwardly within said tubular ⁇ casing to engage the prong mounting member to force the prongs secured thereto downwardly and outwardly through said annular channel whereby to bend the prongs to extend across the central opening of the circular members to form an article holding structure.
- a fishing tool the combination of: a cylindrical casing open at the lower end and provided with an interior annular concave surface adjacent the lower end; a ring held within the casing adjacent the lower end thereof, said ring being provided with an exterior convex surface in spaced relation lto the aforesaid concave surface to form a channel therebetween; a collar within the casing and movable longitudinally of the casing, said collar being provided with a plurality of downwardly extending deformable prongs; ports in said ring adapted to guide said prongs into said channel; and means movable within the casing and adapted to strike the collar to force said prongs through said channel and lapping relation, said ring being adapted to cooperate with said collar to stop downward movement of the collar.
- a fishing tool the combination of: a cylindrical casing open at the lower end and provided with an interior annular concave surface adjacent the lower end; a, ring held within the casing adjacent the lower end thereof. said ring being provided with an exterior convex surface in spaced relation to the aforesaid concave surface to form a channel therebetween; a collar within the casing and movable longitudinally of the casing, said collar being provided with a plurality of downwardly extending deformable prongs having substantially parallel side edges; ports in said ring adapted to guide said prongs into said channel; a plug carried by the upper end of the cylindrical casing, a stem of polygonal section extending slidably through said plug, a
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Description
Dec. 23, 1941.
A. T. COOPER 2,266,739
WELL FISHING TOOLA Filed Jan. l5, 1940 Patented Dec. 23, 1941 WELL nsmNc. `Toor.
Alexander T. Cooper, Long Beach, Calif., assigner to Acme Patent Development Corporation,
Long Beach, Calif., a corporation oi* California Application January 13, 1940, Serial No. 313,749
' '1 claims. (o1. 294-36) This invention relates to oil well equipment and more particularly to a shing tool for removing lost objects from a well.
In drilling a well with the rotary system parts of drilling bits often become detached therefrom,
. such as cones, pieces of the bit itself, nuts, washers and other objects. If such objects are not removed from the well they materially impede further drilling operations.
Apparatus has heretofore been devised for the above stated purpose, and while such apparatus serves their intended purpose their capacity is somewhat limited, it often being necessary to make more than a single trip down the well to recover al1 of the lost junk.
It is therefore an object of this invention to provide an apparatus of the character described in which the article recovery mechanism may be quickly operated to engage lost objects from a well and then reset for another operation after removing the same.
Another object is to provide a fishing tool so constructed that the sh engaging or article recovery mechanism will occupy little space when set for a sh removing operation thereby enabling the same to not only engage larger objects than heretofore possible, but have greater capacity.
A further object is to provide a ilshing tool of the character described constructed in such a manner than a basketlike structure is formed when the tool is operated thereby collecting both small and large objects and retaining the same while the tool is being removed from the well.
A still further object is to provide a well llshing tool that is of simple and economical construction which may be readilyr operated to recover lost articles in a well.
Other objects and advantages will be apparent from the following disclosure, reference being had ,to the accompanying drawing in which Fig. 1 is a vertical section taken through the improved fishing tool in a well hole showing the parts as they appear prior to a tlsh engaging operation.
Fig. 2 is a fragmentary section similar to Fig. 1 showing them as they appear after the catcher has been operated.
Fig. 3 is an enlarged perspective view in section of the catcher.
Fig. 4 is a horizontal section taken on line 4-4 of Fig. 3, but showing the catcher as it appears after being operated.
' Fig. 5 is a detail section taken on line 5-5 of Fig. 4.
Referring more specifically to the drawing IIJ generally designates the improved shing tool disposed in a well H, in the present instance it is shown connected through a tool joint T to a string of drill pipe D.
It will be understood that the tool may be connected to a steel cable or sand line and operated by a set of jars connected thereto in a manner hereinafter described.
Removably secured to the lower end of tubular casing I2 preferably by screw threads I3 is the article recovery mechanism or catcher I4 which is operated through engagement with the head I5 of a plunger I6 square shaped in cross section slidably mounted in a correspondingly shaped opening formed in a plug Il connected to the upper end of the tubular casing I2. y I Plug I'I is provided with a plurality of flui circulating openings I8 while the bar I6 has a uid passage I9 therethrough for the circulating mud and is provided with a pin 20 for connection with the box 2| of the tool joint T.
'I'he article recovery mechanism I4 consists of a base member 22 having an internal concave face 23 and an upper member 24 having a convex face 25 mounted thereon which when assembled form an annular arcuate channel or guide Way indicated at 26 which serves to bend or turn inwardly a plurality of prongs or flat fingers 21 when the mechanism is operated. The upper member 24 has a lateral ange 28 in which is formed a plurality of slots 30 into which project the pointed ends 3| of the prongs 21 when the mechanism is assembled for a fishing operation as shown in Figs. 1 and 3, the upper member being secured by screws 32 to the base.
Prongs 2l are preferably formed' of a pliable material such as sheet steel employed in die stamping operations, and are secured at their upper ends to a ring 34 preferably by welding as indicated at 35, it being noted that the prongs are curved in cross section on a radius corresponding to the slots 30 in order to add strength to the same after they have been bent into a fish engaging position as shown in Fig. 2.
Formed on the lower end-of the base member 22 is a row of teeth 22a which serve to penetrate the formation and loosen any earthy material that may have settled around the fish on the bottom of the hole, the tool being rotated and circulating fluid pumped therethrough at this time. The head I5 of the plunger is held out of engagement with the mechanism I4 after assembling until it is desired to operate the same by a sheer pin 36 that is mounted in the. wall of tube l2 the projecting end being disposed in a recess 3l formed in the side wall oi' the head.
In use the improved fishing tool is connected to the drill pipe T and lowered into the well until it rests on the bottom, if the ilsh"cr other lost objects have become embedded below accumulated earthy cuttings, the drill pipe then connected with a hydraulic swivel and pipe rotated until the earthy material has become loosened suiiiciently to permit the prongs o! the apparatus to be disposed beneath the ilsh.
The draw works brake (not shown) is then released whereupon the dead weight of the drill pipe on its downward movement causes the head l1 on bar I6 of the plunger to engage the ring 2l and force it downwardly, such action bending the prongs 21 and closing them around the Ilsh, due to the curvature of the channel or guideway 26.
Thus it wil be seen that when ring 3l is pressed downwardly as above described a substantially basket-like structure is formed (see Fig. 4) at which time the prongs 21 pass underneath the ilsh as shown in Fig. 2, the prongs being shown (in Fig. 4) as they appear after being forced downwardly and inwardly when the tool is out of the well, it being particularly noted that due to the construction the area of the opening in the mechanism I4 is practically closed after the above described operation thereby engaging both large and small objects. Also the structure is strengthened due to inner end of the prongs being in overlapping relation.
When removing sh that have not 'been in the well hole for any great length of time or have not become covered with sand or other earthy material the fishing tool is adapted to be connected to a steel cable or sand line with a set of jars (not shown) connected to the pin 2|. After the tool has reached the bottom of the hole the jars are actuated a number of times, the action of which closes the prongs around the sh as above described.
After completing a shing operation the tool IU is removed from the Well, the catcher Il is discharged of the recovered ilsh after which the tool is reset for another operation. This is accomplished by placing the catcher i4 over or inserting a bar into it of such diameter that it will pass through ring 34 and engage the face of ilange 28, then holding the ring stationary and pushing on the bar or vice versa the action of which separates the ring from the base members 22 and at the same time straightens the prongs 21. 'I'he prongs may then be inserted in the ascenso nected to said mst-mentioned, member. and a plunger movable downwardly within said tubular member to engage said mormting member and force said prongs down through said channel, whereby they will be bent to e radially across said central opening to form article holding structure.
2. An apparatus of the class described comprising a base member having a central opening and a downwardly converging concave surface, anuppermemberhavingaiiangesecuredtosaid base member and a downwardly converging convex surface spaced inwardly from said concave surface to form a downwardly and inwardly curving channel, an annular member having a plurality o! bendable prongs detachably secured thereto. the free ends oi said prongs projecting downwardly into said channel, a tubular member connected to and extending upwardly from said base member, -a plug secured to the upper. end of said tubular member, a plunger slidably mounted in said plug and movable downwardly in said tubular member into engagement with said annular member to force said prongs through said channel, whereby they will be bent to extend'radially across said central opening to form an article holding structure, said annular member engaging said upper member to limit the radial projection of said prongs across said opening.
3. An apparatus of the class described comprising a member having a plurality of vertical circularly spaced bendable prongs, a base member having a downwardly converging circumferentially continuous channel formed therein into which the free ends of said prongs project, a tubular casing detachably connected to said base member, a plug detachably secured to the upper end oi.' said tubular member, a plunger slidably mounted in said plug, a plunger head secured to said plunger and movable downwardly within said tubular member into engagement with said prong member to'force the prongs bend them toward each other to form an article engaging structure.
It will b'e understood that after an operation instead of straightening the prongs as above described the pronged members may be readily replaced by another unused member, thus conserving the time between succeeding operations.
Iclaim:
` 1. A fishing tool for wells comprising a member having a central opening and a downwardly converging surface, a second member having a downwardly converging surface opposed to said rstmentioned surface and spaced therefrom to form a circumferentially continuous annular channel, a plurality of circularly spaced bendable prongs having their free ends extending downwardly into said channel, a mounting member to which said prongs are secured, a tubular member con- 4. A shing tool for wells comprising a cylindrical base member having a central opening in its lower end and a downwardly converging inner surface with an annular row of cutting teeth therebelow, a companion member having a downwardly convering surface opposed to said base member and spaced therefrom to form a circumferentially continuous channel therebetween detachably secured to said base member, a plurality of bendable spaced prongs having their free ends engaging the channel formed between the base and vsaid companion member, an annular mounting member to which said prongs are secured, a tubular member connected to said base member, a plug connected to the upper end of said tubular member, and a plunger splined to said plug to rotate the tubular member and force the prongs downwardly through the channel whereby to bend and force them to extend across the central opening of the circular member to form an article -holding structure.
5. An oil well shing tool comprising a tubular casing, a circular member having a central opening and a downwardly converging surface detachably secured to the lower end of said casing, a second circular member detachably secured to said first mentioned member having a downwardly converging surface and spaced therefrom to form a circumferentially continuous annular channel, an annular independently removable v guidingly deform the same inwardly into over-l prong mounting member havingva plurality of bendable prongs secured thereto, their free ends engaging the circumferential annular channel formed by the circular members, and a plunger movable downwardly within said tubular` casing to engage the prong mounting member to force the prongs secured thereto downwardly and outwardly through said annular channel whereby to bend the prongs to extend across the central opening of the circular members to form an article holding structure.
6. In a fishing tool, the combination of: a cylindrical casing open at the lower end and provided with an interior annular concave surface adjacent the lower end; a ring held within the casing adjacent the lower end thereof, said ring being provided with an exterior convex surface in spaced relation lto the aforesaid concave surface to form a channel therebetween; a collar within the casing and movable longitudinally of the casing, said collar being provided with a plurality of downwardly extending deformable prongs; ports in said ring adapted to guide said prongs into said channel; and means movable within the casing and adapted to strike the collar to force said prongs through said channel and lapping relation, said ring being adapted to cooperate with said collar to stop downward movement of the collar.
7. In a fishing tool, the combination of: a cylindrical casing open at the lower end and provided with an interior annular concave surface adjacent the lower end; a, ring held within the casing adjacent the lower end thereof. said ring being provided with an exterior convex surface in spaced relation to the aforesaid concave surface to form a channel therebetween; a collar within the casing and movable longitudinally of the casing, said collar being provided with a plurality of downwardly extending deformable prongs having substantially parallel side edges; ports in said ring adapted to guide said prongs into said channel; a plug carried by the upper end of the cylindrical casing, a stem of polygonal section extending slidably through said plug, a
, head carried by said stem within said casing,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US313749A US2266739A (en) | 1940-01-13 | 1940-01-13 | Well fishing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US313749A US2266739A (en) | 1940-01-13 | 1940-01-13 | Well fishing tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2266739A true US2266739A (en) | 1941-12-23 |
Family
ID=23216980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US313749A Expired - Lifetime US2266739A (en) | 1940-01-13 | 1940-01-13 | Well fishing tool |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2266739A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2617486A (en) * | 1949-08-09 | 1952-11-11 | Jake J Davis | Well fishing tool |
| US2709617A (en) * | 1951-12-26 | 1955-05-31 | Arthur O Lang | Junk basket for wells |
| EP0113201A1 (en) * | 1982-12-16 | 1984-07-11 | Robert Patrick Appleton | Device for retrieving objects from wells |
-
1940
- 1940-01-13 US US313749A patent/US2266739A/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2617486A (en) * | 1949-08-09 | 1952-11-11 | Jake J Davis | Well fishing tool |
| US2709617A (en) * | 1951-12-26 | 1955-05-31 | Arthur O Lang | Junk basket for wells |
| EP0113201A1 (en) * | 1982-12-16 | 1984-07-11 | Robert Patrick Appleton | Device for retrieving objects from wells |
| US4545432A (en) * | 1982-12-16 | 1985-10-08 | Appleton Robert P | Device for retrieving objects from wells |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2751010A (en) | Junk basket | |
| US2942850A (en) | Multiple drill | |
| US3552507A (en) | System for rotary drilling of wells using casing as the drill string | |
| US1867289A (en) | Inside casing cutter | |
| US2236761A (en) | Well fishing tool | |
| US2675879A (en) | Fishing tool for use in deep wells | |
| US2947362A (en) | Fishing tool | |
| US2120240A (en) | Drilling apparatus | |
| US2266739A (en) | Well fishing tool | |
| US4545432A (en) | Device for retrieving objects from wells | |
| JPS6078091A (en) | Core collecting apparatus | |
| US3082831A (en) | Combined wash-over and well tubing retriever apparatus | |
| US3174548A (en) | Combination washover tool, pipe cutter and retriever | |
| US2935130A (en) | Method of and apparatus for opening plugged pipe in a well bore | |
| US2665886A (en) | Method and apparatus for drilling wells | |
| US2998074A (en) | Oil and gas well cleaning apparatus | |
| US1936643A (en) | Outside pipe cutter | |
| US1524265A (en) | Connecting device such as tap and die collar | |
| US1987853A (en) | Core catching means | |
| US1819798A (en) | Collapsible bit | |
| US1816991A (en) | Fishing tool | |
| US2305200A (en) | Drilling tool | |
| US2099859A (en) | Collapsible rotary core drill | |
| US2621025A (en) | Jarring tool | |
| US2817555A (en) | Method and system of retrieving stuck pipe joints in well bores |