CN105178902B - Lifting type fishing tool - Google Patents
Lifting type fishing tool Download PDFInfo
- Publication number
- CN105178902B CN105178902B CN201510473673.3A CN201510473673A CN105178902B CN 105178902 B CN105178902 B CN 105178902B CN 201510473673 A CN201510473673 A CN 201510473673A CN 105178902 B CN105178902 B CN 105178902B
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- lifting
- chamber
- fishing tool
- type fishing
- magnetic core
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- 238000007789 sealing Methods 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 description 15
- 238000005553 drilling Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
The invention provides a lifting type fishing tool, which comprises an outer barrel, an inner barrel, a lifting piece, a magnetic core and a self-sealing part, wherein the inner barrel is sleeved in the outer barrel, and an annular flow passage is formed between the outer barrel and the inner barrel; the lifting cylinder body is axially arranged in the inner cavity of the inner cylinder body, a lifting cavity is arranged in the lifting cylinder body, and the annular flow channel extends to the bottom of the lifting cavity and is communicated with the lifting cavity; the lifting piece can axially slide and penetrate through the lifting cavity; the magnetic core can adsorb the underground falling objects and is connected with the lifting piece; the self-sealing part is connected below the outer cylinder body and can be folded by pressure. The magnetic core is arranged to adsorb underground magnetic falling objects, the barrel and the lifting piece are arranged to lift the magnetic core and the adsorbed underground falling objects, the magnetic core and the underground falling objects are lifted into the inner cavity of the inner barrel, the fishing pipe column can be pressed down to enable the self-sealing part to be folded in and self-seal, the unadsorbed underground falling objects are fished, the secondary falling of the fished underground falling objects is prevented, and the magnetic core cannot be damaged during pressing down.
Description
Technical field
It is especially a kind of to salvage function and self-sealing function with magnetic force the present invention relates to oil drilling fishing operation field
Lifting type fishing tool.
Background technology
In oil drilling process, due to lacking the conscious understanding to subsurface structure, lithological characteristic, manual operation in addition is lost
By mistake, underground complex accident is often caused, wherein, it is current relatively more normal that the small articles such as gear wheel, ball bearing, tooth, which drop in well,
A kind of underground complex accident seen, it is necessary to carry out underground fishing operation, and normal wellbore construction could be carried out after all pulling out
Operation, gently then expends a large amount of human and material resources and financial resources, heavy then can trigger secondary complex accident, causes part well section even full well
Scrap, bring massive losses to whole drilling operation.
At present, being usually used in the instrument that underground small articles are salvaged mainly includes strong magnetic die, tackles all problems at once, reacting cycle salvaging
The specific purpose tools such as basket, junk mill.Strong magnetic die is mainly that the permanent magnet carried using itself carries out magnetic to trouble of lost tool in hole
Change absorption, so as to realize that small falling object is salvaged；Tackle all problems at once and be made up of one section of low carbon steel pipe, one end of steel pipe is cut into tooth
Pawl, caught for junk；Junk basket with reverse circulation is in the local reverse-circulation effect at shaft bottom that underground is broken using drilling fluid
In thing income hoop, shaft bottom is purified；Junk mill is then to have the graininess hard alloy from whetstone effect straight by its surface overlaying
Connect and grind trouble of lost tool in hole.
Although above-mentioned fishing tool has been equipped with certain salvaging ability at present, its scene is salvaged effect and paid no attention to
Think, it is still necessary to further improve perfect.For example strong magnetic die is transferred to shaft bottom, can not be revolved in the case where there is the pressure of the drill
Turn drilling tool with anti-tamper magnetic core, meanwhile, when pulling out of hole, rotating disk shackle not allowable is de- to prevent from getting rid of junk；Tackle all problems at once and be limited to its work
Make mechanism, be generally limited to shallow well operation, furthermore, it desired to which shaft bottom can not be too soft, otherwise pawl can not be bent, so as to it can not drag in
Junk；The defects such as basket pawl breaks to fall in advance, salvaging efficiency is low be present in junk basket with reverse circulation；Junk mill milling process takes long, influence
Overall progress.
In consideration of it, it is necessary to design a kind of new fishing tool.
The content of the invention
It is an object of the invention to provide a kind of lifting type fishing tool, and it has magnetic force concurrently and salvages function and self-sealing function.
To reach above-mentioned purpose, the present invention proposes a kind of lifting type fishing tool, a kind of lifting type fishing tool, its feature
It is, the lifting type fishing tool includes：Outer cylinder body；Inner barrel, be set in the outer cylinder body, the outer cylinder body with it is described
Annular channel is formed between inner barrel；Cylinder is lifted, vertically in the inner chamber of the inner barrel, is had in the lifting cylinder
There is lifting chamber, the annular channel extends to the lifting bottom of chamber portion and connected with the lifting chamber；Lifting member, it can slide axially
Ground is arranged in the lifting chamber；The magnetic core of trouble of lost tool in hole can be adsorbed, is connected with the lifting member；Self-styled part, it is connected to institute
State below outer cylinder body, and can be collapsed by being pressurized.
Lifting type fishing tool as described above, wherein, the annular channel includes annular vertical section and along described outer
The annular horizontal section extended radially inwardly of cylinder, the lifting chamber are located above the annular horizontal section, the annular channel
Opening up U-shaped runner is formed with the lifting chamber.
Lifting type fishing tool as described above, wherein, the lifting cylinder is pillar buoy, and the lifting chamber is cylindricality
Chamber, the lifting member are in shaft-like with the lifting chamber cooperation.
Lifting type fishing tool as described above, wherein, the quantity of the lifting cylinder and the lifting member be it is multiple,
Multiple lifting cylinders are arranged on the inside of the inner barrel in a ring, and multiple lifting member are arranged in corresponding described respectively
Lift in cylinder.
Lifting type fishing tool as described above, wherein, the lifting cylinder includes lifting overcoat and is sheathed on the act
Rise the lifting inner sleeve in overcoat, the lifting chamber formed between the lifting overcoat and the lifting inner sleeve, the lifting chamber and
The lifting member is in a ring.
Lifting type fishing tool as described above, wherein, in the upper end side wall of the lifting cylinder through have with it is described interior
The relief hole of the inner chamber connection of cylinder.
Lifting type fishing tool as described above, wherein, the lifting member bottom is fixed with seal head, the seal head with
The internal face palette of the lifting cylinder.
Lifting type fishing tool as described above, wherein, the lifting type fishing tool also includes being located at the lifting cylinder
Lifting pressing plate above body, the lifting member and the magnetic core are both connected to below the lifting pressing plate, and the magnetic core is located at
On the inside of the lifting member.
Lifting type fishing tool as described above, wherein, the self-styled part is in claw-like.
Lifting type fishing tool as described above, wherein, the inner barrel top is provided with the ball seat for being used for setting.
The characteristics of lifting type fishing tool of the present invention and advantage are：
1st, lifting type fishing tool of the invention, the magnetic junk of underground is adsorbed by setting magnetic core, is lifted by setting
Cylinder and lifting member are risen to lift the trouble of lost tool in hole of magnetic core and absorption, magnetic core and trouble of lost tool in hole are lifted in the inner chamber of inner barrel
Afterwards, can push fishing string makes self-styled part gathering self-styled, catches trouble of lost tool in hole not to be adsorbed, and the underground for preventing from salvaging falls
Thing is secondary to be dropped, and magnetic core will not be damaged when pushing, and securely and reliably, salvages efficiency high.
2nd, lifting type fishing tool of the invention is simple in construction, easy to operate.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is the sectional view of one embodiment of the present of invention.
Fig. 2 is the schematic diagram of the lifting state of lifting type fishing tool in Fig. 1；
Fig. 3 is the combination diagram of outer cylinder body and inner barrel in Fig. 1；
Fig. 4 is outer cylinder body in Fig. 1, inner barrel and the combination diagram for lifting cylinder；
Fig. 5 is along the sectional view of line A-A in Fig. 4；
Fig. 6 is lifting member in Fig. 1, magnetic core and the combination diagram for lifting pressing plate；
Fig. 7 is the upward view of combiner in Fig. 6；
Fig. 8 is the schematic diagram of self-styled part；
Fig. 9 is along the sectional view of line B-B in Fig. 8；
Figure 10 is outer cylinder body in an alternative embodiment of the invention, inner barrel and the combination diagram for lifting cylinder.
Main element label declaration：
The annular channel of 1 outer cylinder body 11
The steel ball of 2 inner barrel, 21 ball seat 22
3 lifting cylinders 31 lift the relief hole of chamber 32
The magnetic core 6 of 4 lifting member 5 lifts pressing plate
The 7 self-styled top connections of part 8
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now control illustrates this hair
Bright embodiment.
As shown in Figure 1 and Figure 2, for the present invention lifting type fishing tool one embodiment schematic diagram, the lifting type
Fishing tool includes outer cylinder body 1, inner barrel 2, lifting cylinder 3, lifting member 4, the magnetic core 5 that can adsorb trouble of lost tool in hole, self-styled part 7
With top connection 8.Inner barrel 2 is socketed in outer cylinder body 1, and annular channel 11 is formed between outer cylinder body 1 and inner barrel 2；Lift cylinder 3
Along the axial direction of inner barrel in the inner chamber of inner barrel 1, there is lifting chamber 31 in lifting cylinder 3, annular channel 11 extends to act
Rise the bottom of chamber 31 and connected with lifting chamber 11；Lifting member 4 can be axially slidably arranged in lifting chamber 11, and with lifting chamber 31
Side wall palette, thus inject the fluid in annular channel 11 lift can ejection lifting member 4 upwards after chamber 31 entering；
Magnetic core 5 is for example located in the inner chamber of inner barrel in shaft-like or strip, preferably strong magnetic magnetic core, magnetic core 5, magnetic core 5
Upper end be the connection end that be connected with lifting member 4, can be moved up with lifting member, the lower end of magnetic core 5 is that can adsorb underground magnetic
The absorption end of property junk；Self-styled part 7 is connected to the lower section of outer cylinder body 1, and can be collapsed by being pressurized, and self-styled part 7 is located at magnetic core
Lower section, and magnetic core is surrounded, magnetic core is located at self-styled part innerside in other words.It is lifted to certainly in the magnetic core 5 for adsorbing the junk that is magnetic
After sealing the top of part 7, by ground apply the pressure of the drill make self-styled part be pressurized collapsed to the axis direction of inner barrel it is self-styled, on the one hand
Non magnetic junk can be caught by collapsing, on the other hand can also prevent trouble of lost tool in hole is secondary to drop, further, since magnetic core 5 by
The self-styled top of part 7 is lifted to, magnetic core will not be damaged when applying the pressure of the drill, salvages efficiency high, securely and reliably.
Specifically, as shown in figure 3, the longitudinal section of outer cylinder body 1 is L-shaped, the longitudinal section of inner barrel 2 is L-shaped, by outer cylinder body 1
Enclosed with inner barrel 2 and set the annular channel 11 to be formed and include annular vertical section and the annular extended radially inwardly along outer cylinder body 1
Horizontal segment, lifting chamber 31 are located above annular horizontal section, and annular channel 11 and lifting chamber 31 form opening up U-shaped runner.
As shown in Figures 4 to 7, in the present embodiment, lifting cylinder 3 is pillar buoy, and lifting chamber 31 is cylinder chamber, lifting member
4 be in the rod-like structure coordinated with lifting chamber 31.The horizontal segment of the horizontal segment of inner barrel and outer cylinder body connects, so as to by inner barrel
Position is fixed, and the lifting cylinder 3 of cylindricality is for example fixed by a pin to above the horizontal segment of inner barrel and the horizontal segment of outer cylinder body,
And it is tightly connected with inner barrel and outer cylinder body.
Wherein, the quantity for lifting cylinder 3 and lifting member 4 is multiple, and multiple lifting cylinders 3 are arranged in inner barrel in a ring
2 inner sides, multiple lifting member 4 are arranged in corresponding lifting cylinder 3 respectively.It is preferred that multiple lifting cylinders 3 are arranged at intervals, it is more
Individual lifting member 4 is also arranged at intervals.
As shown in Figure 6, Figure 7, lifting type fishing tool also includes the lifting pressing plate 6 located at the top of lifting cylinder 3, lifting member
4 and magnetic core 5 be both connected to lifting pressing plate 6 lower section, and magnetic core 5 be located on the inside of lifting member 4, in order to adsorb trouble of lost tool in hole.At this
In embodiment, lifting member 4 is arranged in a ring below lifting pressing plate 6, and is enclosed in the outside of magnetic core 5, magnetic core 5 or multiple,
And in a ring, be spaced, to increase adsorption area, realize effectively absorption.
In the embodiment shown in fig. 1, the top of inner barrel 2 is provided with the ball seat 21 for being used for setting, to be set by pitching
Change fluid main thoroughfare, after putting into steel ball 22 to underground from ground, steel ball 22 is set on ball seat 21, so as to by inner barrel 3
The pit shaft inner chamber of the top of inner chamber and inner barrel 3 separate, fluid (such as drilling fluid) is fully entered in annular channel 11.
Wherein, lift in the upper end side wall of cylinder 3 through there is the relief hole 32 that the inner chamber with inner barrel 2 connects, lifting
When part 4 is moved to 32 top of relief hole, the fluid entered by annular channel 11 in lifting chamber 31 is just flowed out by relief hole 32, fluid
Into shaft bottom, recover circulation.
In addition, the bottom of lifting member 4 is fixed with seal head 41, seal head 41 and the internal face palette for lifting cylinder 3, because
And when seal head 41 is located at below relief hole 32, the lifting chamber 31 positioned at the lower section of seal head 41 is the chamber that builds the pressure, and fluid is by annular
After the entrance of runner 11 chamber that builds the pressure, lifting member 4 can be promoted to move up, when seal head 41 is moved to above relief hole 32, position
Lifting chamber 31 in the lower section of seal head 41 is pressure-releasing chamber, and fluid can be flowed into the inner chamber of inner barrel via pressure-releasing chamber, relief hole, then
Access wall bottom, re-establish underground circulation.In addition, also pad can be set between seal head and lifting member or in seal head bottom
Piece.The lifting type fishing tool of the present invention, the sealing for realizing lifting cavity fluid by seal head and pad build the pressure, and pass through fluid
The lifting for building the pressure and realizing to magnetic core and the junk of capture is sealed, it is simple in construction, it is easy to operation.
As shown in Figure 8, Figure 9, self-styled part 7 is in claw-like, for example, tooth pawl, tooth pawl non-vertical structure when being manufactured, and
It is the angle held together with, the angle is, for example, 2 °~3 °, so as to by rotating, pressurizeing, complete the salvaging of tooth pawl and self-styled work(
Energy.
Again as shown in figure 1, top connection 8 is the connection member of outer cylinder body 1 and fishing string, the both ends of top connection 8 are equipped with
Cylinder, i.e. outer cylinder body and inner barrel, connection are salvaged in screw thread, the upper end connection fishing string of top connection, the lower end connection of top connection
Above outer cylinder body 1, and the inner chamber of top connection 8 connects with annular channel 11.
When salvaging trouble of lost tool in hole using the lifting type fishing tool of the present invention, first, top connection 8 and fishing string are connected
Connect, by under a whole set of tubing string together lower going-into-well, when under lifting type fishing tool to apart from the 0.5 meter of place in shaft bottom, turn on pump circulation, flushing
Shaft bottom.After flushing, continue to transfer at lifting type fishing tool to shaft bottom, now magnetic core 5 can adsorb the magnetic junk of underground；
Then, steel ball 22 is put into by ground, steel ball 22 is set in ball seat 21, fluid is injected into pit shaft from well head, because steel ball is set
In ball seat, fluid fully enters the annular channel 11 between inner barrel 2 and outer cylinder body 1, and then enters in lifting chamber 31, with stream
The lasting injection of body, pressure rise in chamber 31 is lifted, so as to apply a upward lifting force to lifting member 4, lifting member 4, which promotes, lifts
Boosting plate 6 moves up, and lifting pressing plate 6 drives magnetic core 5 up, and then the junk of absorption is promoted to inside inner barrel 2.When close
When end socket 41 is increased to 32 top of relief hole, relief hole 32 is opened, and fluid is exited into by relief hole 32 in the inner chamber of inner barrel,
Access wall bottom again, recover circulation.Now, because magnetic core 5 is gone upward to above tooth pawl, the pressure of the drill can be applied from ground to fishing string,
Such as rotate and push drilling tool or fishing string, tooth pawl catch non magnetic junk be simultaneously pressurized inside cylinder axis direction collapse from
Envelope, complete to the pushing of tooth pawl, collapse, backing, so as to complete the backing to trouble of lost tool in hole, trouble of lost tool in hole will not drop again,
So far, fishing terminates, and above carries drilling tool or fishing string.
As shown in Figure 10, in the second embodiment, lifting cylinder 3 includes lifting overcoat and is sheathed in lifting overcoat
Inner sleeve is lifted, the horizontal segment of lifting overcoat and outer cylinder body 1 is tightly connected, and lifting inner sleeve and the horizontal segment of inner barrel 2 are tightly connected,
Lift and lifting chamber 31 is formed between overcoat and lifting inner sleeve, lift chamber 31 and lifting member 4 in a ring.Wherein, overcoat is lifted
Top is also connected with lifting the top of inner sleeve, so as to which the position of inner barrel be fixed, or can also use other modes by
The position of cylinder is fixed, such as the connecting rod that setting both ends are connected with outer cylinder body and inner barrel respectively in annular channel, only
Otherwise hinder the free-flowing of fluid.Other structures, operation principle and the beneficial effect of present embodiment and first reality
It is identical to apply example, will not be repeated here.
The lifting type fishing tool of the present invention, effectively it compensate under existing strong magnetic die to having the feelings of the pressure of the drill behind shaft bottom
Non-rotatable deficiency under condition, overcome existing tackle all problems at once and be only limited to shallow well and require that shaft bottom possesses the defects of certain degree of hardness.
Compared with existing fishing tool, lifting type fishing tool of the invention has both following characteristics：(1) possesses magnetic force, tooth pawl is dual beats
Drag for function；(2) possesses magnetic core from lifting function；(3) non magnetic trouble of lost tool in hole can be salvaged by pressurization, rotation process；(4) have
Standby self-sealing function, can hold the junk salvaged to inner barrel, prevent secondary drop.
The schematical embodiment of the present invention is the foregoing is only, is not limited to the scope of the present invention.It is any
Those skilled in the art, the equivalent variations made on the premise of the design of the present invention and principle is not departed from and modification, all should
Belong to the scope of protection of the invention.And it should be noted that the present invention each part be not limited in above-mentioned entirety should
With, each technical characteristic described in specification of the invention can according to be actually needed selection one individually use or select it is multinomial
Combine use, and therefore, the present invention covers the other combinations relevant with this case inventive point and concrete application in the nature of things.
Claims (9)
1. a kind of lifting type fishing tool, it is characterised in that the lifting type fishing tool includes：
Outer cylinder body；
Inner barrel, it is set in the outer cylinder body, annular channel is formed between the outer cylinder body and the inner barrel；
Cylinder is lifted, vertically in the inner chamber of the inner barrel, there is lifting chamber, the annular flow in the lifting cylinder
Road extends to the lifting bottom of chamber portion and connected with the lifting chamber；
Lifting member, can axially slidably it be arranged in the lifting chamber；
The magnetic core of trouble of lost tool in hole can be adsorbed, is connected with the lifting member；
Self-styled part, it is connected to below the outer cylinder body, and can be collapsed by being pressurized；
The annular channel includes annular vertical section and the annular horizontal section extended radially inwardly along the outer cylinder body, institute
State lifting chamber to be located above the annular horizontal section, the annular channel and the lifting chamber form opening up U-shaped runner.
2. lifting type fishing tool as claimed in claim 1, it is characterised in that the lifting cylinder is pillar buoy, the act
It is cylinder chamber to rise chamber, and the lifting member is in shaft-like with the lifting chamber cooperation.
3. lifting type fishing tool as claimed in claim 2, it is characterised in that the lifting cylinder and the number of the lifting member
Amount is multiple, and multiple lifting cylinders are arranged on the inside of the inner barrel in a ring, and multiple lifting member are worn respectively
In in the corresponding lifting cylinder.
4. lifting type fishing tool as claimed in claim 1, it is characterised in that the lifting cylinder includes lifting overcoat and set
Lifting inner sleeve in the lifting overcoat, the lifting chamber, institute are formed between the lifting overcoat and the lifting inner sleeve
State lifting chamber and the lifting member in a ring.
5. lifting type fishing tool as claimed in claim 1, it is characterised in that run through in the upper end side wall of the lifting cylinder
There is the relief hole that the inner chamber with the inner barrel connects.
6. lifting type fishing tool as claimed in claim 1, it is characterised in that the lifting member bottom is fixed with seal head,
The internal face palette of the seal head and the lifting cylinder.
7. lifting type fishing tool as claimed in claim 1, it is characterised in that the lifting type fishing tool also includes being located at
Lifting pressing plate above the lifting cylinder, the lifting member and the magnetic core are both connected to below the lifting pressing plate, and institute
Magnetic core is stated to be located on the inside of the lifting member.
8. lifting type fishing tool as claimed in claim 1, it is characterised in that the self-styled part is in claw-like.
9. lifting type fishing tool as claimed in claim 1, it is characterised in that the inner barrel top, which is provided with, is used for what is set
Ball seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473673.3A CN105178902B (en) | 2015-08-05 | 2015-08-05 | Lifting type fishing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473673.3A CN105178902B (en) | 2015-08-05 | 2015-08-05 | Lifting type fishing tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105178902A CN105178902A (en) | 2015-12-23 |
| CN105178902B true CN105178902B (en) | 2018-01-05 |
Family
ID=54901258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510473673.3A Active CN105178902B (en) | 2015-08-05 | 2015-08-05 | Lifting type fishing tool |
Country Status (1)
| Country | Link |
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| CN (1) | CN105178902B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863542A (en) * | 2016-05-05 | 2016-08-17 | 中盐金坛盐化有限责任公司 | In-wellbore fishing tool for salt well blocking improvement |
| CN105840125B (en) * | 2016-06-13 | 2019-02-01 | 新疆如通石油技术服务有限公司 | A kind of controllable reacting cycle structure |
| CN111305783B (en) * | 2019-11-18 | 2023-09-26 | 中国石油天然气集团有限公司 | Underground junk salvaging device and salvaging method |
| CN112282687A (en) * | 2020-11-12 | 2021-01-29 | 山东省邱集煤矿有限公司 | Method for quickly salvaging drill bit and drill bit salvaging device |
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| US2734767A (en) * | 1956-02-14 | Magnetic junk catcher | ||
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| Publication number | Publication date |
|---|---|
| CN105178902A (en) | 2015-12-23 |
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