CA1161425A - Bottom hole motor for driving rock-breaking tool - Google Patents
Bottom hole motor for driving rock-breaking toolInfo
- Publication number
- CA1161425A CA1161425A CA000359877A CA359877A CA1161425A CA 1161425 A CA1161425 A CA 1161425A CA 000359877 A CA000359877 A CA 000359877A CA 359877 A CA359877 A CA 359877A CA 1161425 A CA1161425 A CA 1161425A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- bottom hole
- races
- motor
- thrust bearing
- 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
Links
- 230000020347 spindle assembly Effects 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims abstract 2
- 238000005096 rolling process Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 9
- 230000002829 reductive effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- SRVJKTDHMYAMHA-WUXMJOGZSA-N thioacetazone Chemical compound CC(=O)NC1=CC=C(\C=N\NC(N)=S)C=C1 SRVJKTDHMYAMHA-WUXMJOGZSA-N 0.000 description 1
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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/003—Bearing, sealing, lubricating details
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Rolling Contact Bearings (AREA)
- Friction Gearing (AREA)
- Crushing And Grinding (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Turning (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
Abstract
ABSTRACT
The invention is concerned with a bottom hole drill comprising a motor, a spindle assembly having a housing, a shaft extending through the housing and coupled at one end to the motor, a thrust bearing com-prising a plurality of races and rings arranged co-axial about the shaft, and a radial roller bearing the outer races of which are formed by the races of the thrust bearing and the inner races of which comprise peripheral grooves formed in the surface of the shaft, and a tool mounted on the other end of the shaft,
The invention is concerned with a bottom hole drill comprising a motor, a spindle assembly having a housing, a shaft extending through the housing and coupled at one end to the motor, a thrust bearing com-prising a plurality of races and rings arranged co-axial about the shaft, and a radial roller bearing the outer races of which are formed by the races of the thrust bearing and the inner races of which comprise peripheral grooves formed in the surface of the shaft, and a tool mounted on the other end of the shaft,
Description
BOTTOI`~ ~OL~ ~';OTOR FOR DRIVING ROCK-B~EAKIli~ TOOL
The present inve~tion relates to mining and, more part-icularly, it relates to bottom hole motors for driving rock--breaking tools, desi~ned for drilling and repair of oil, gas and exploratory wells. This invention can also be used in other bottom hole mechanisms.
There is known in the art a bottom hole motor for driv-ing a rock-breaking tool, comprising a motor unit coupled kinematically with a spindle unit having a housing. Passing inside said housing is a shaft connected with the rock--breaking tool and mounted in the housing with the aid of radial bearings and a thrust one. The thrust bearing is es-sentially a set of outer and inner races serving to retain rollin~ bodies located therebetween.
~ rrespective of the configuration of the working sur-faces of prior art races of the thrust bearin~, provision is made for ti~htening the inner races located on the shaft and the outer races located in the spindle unit housing.
Said prior art bottom hole motor is used advantageously in drilling wells of large and medium diameter, however, a multicomponent nature of the spindle unit and relatively lar-~e crosssectional area taken by the thrust bearing elements render the prior art structure unsuitable for drilling wells of small diameter due to impossibility to ensure its reliab-le and duxable operation. This is due to the fact that the utilization of a conventional spindle unit structure when using the prior art bottom hole motor for drilling wells of small diameter calls for a reduced shaft diameter which, in turn, results in the reduction of permissible power developed by the bottom hole motor.
The choice of required shaft diameter from con-siderations of strength leads to a considerable reduction in the diameter of rolling bodies, this leading to further reduction of the service life of the bottom hole motor because of the reduced carrying capacity of the rolling bodies used.
It is the object of the present invention to develop a bottom hole motor for driving a rock-breaking tool, featuring such a structural embodiment of the spindle unit as would ensure an increased durability and reliability of the bottom hole motor operation when drill-ing wells of small diameter, as well as facilitate con-siderably the repair operations.
In accordance with the present invention, there is thus provided a bottom hole drill comprising a motor, a spindle assembly having a housing, a shaft extending through the housing and coupled at one end to the motor, a thrust bearing comprising a plurality of races and rings arranged coaxial about the shaft, and a radial roller bearing the outer races of which are formed by the races of the thrust bearing and the inner races of which comprise peripheralgrooves formed in the surface of the shaft, and a tool mounted on the other end of the shaft.
Such structural arrangement permits of increased dimensions of the rolling bodies at a fixed diameter of the shaft which allows for considerably increasing the durabi-lity of both the thrust bearing and bottom hole motor as a whole, owing to an increased carrying capacity of the rolling bodies.
It is expedient that the shaft of the spindle unit be composed of at least three rigidly interconnected portions including a middle portion provided with the toroidal grooves and two end portions interacting with the radial bearings. This helps improve considerably the quality of the shaft portion provided with grooves and simplify the manufacture of the shaft as a whole.
In addition, such a structural arrangement of the shaft renders the latter more compact, while the improved quality of toroidal grooves makes for a sharp increase of the thrust bearing life.
In order to ensure minimum contact stresses while fully ensuring the possibility of successive assembly of each specific series of the thrust bearing, as well as to maintain the shaft strength, it is expedient that the toroidal grooves for the rolling bodies have a ratio of the radius of the toroidal grooves cross-section to the inner diameter of :
- 3a -the torus lying substantially within 0.1-0.25.
The present invention will be more apparent upon considering the following detailed description of an exemplary embodiment thereof, with references to the accompanying drawings in which:
Figure 1 is a general view of a bottom hole motor for driving xock-breaking tools, according to the invention, longitudinal section, and 1~14ZS
-- 4 _ Figure 2 is a view taken along arrow A of ~ig. 1.
The herein disclosed bottom hole motor for driving rock-breaking tools comprises a motor unit 1 and a spindle unit 2. The motor unit 1 includes a body 3 ~hich accommoda-tes working members such as a helical stator 4 and a heli-cal rotor 5 mounted thereinside.
The spindle unit 2 includes a composite shaft 6 con-sisting of an adapter 7, a portion of the shaft 6 adapted to carry spherical rolling bodies 8 and made as an insert 9, and an output shaft lOt rubber-coated radial bearings 11 and a thrust bearing 12.
The thrust bearing 12 proper is a special multiple thrust-radial ball bearing includin~ outer races 13 and rings 14 interacting with the rolling bodies 8. The latter, in their turn, are in contact ~ith toroidal grooves 15 pro-vided on the outer surface of the insert 9. The outer races 13 and rinp`s 14 are tightened into a monolith set with the aid of thread provided on a housing 16 of the spindle unit
The present inve~tion relates to mining and, more part-icularly, it relates to bottom hole motors for driving rock--breaking tools, desi~ned for drilling and repair of oil, gas and exploratory wells. This invention can also be used in other bottom hole mechanisms.
There is known in the art a bottom hole motor for driv-ing a rock-breaking tool, comprising a motor unit coupled kinematically with a spindle unit having a housing. Passing inside said housing is a shaft connected with the rock--breaking tool and mounted in the housing with the aid of radial bearings and a thrust one. The thrust bearing is es-sentially a set of outer and inner races serving to retain rollin~ bodies located therebetween.
~ rrespective of the configuration of the working sur-faces of prior art races of the thrust bearin~, provision is made for ti~htening the inner races located on the shaft and the outer races located in the spindle unit housing.
Said prior art bottom hole motor is used advantageously in drilling wells of large and medium diameter, however, a multicomponent nature of the spindle unit and relatively lar-~e crosssectional area taken by the thrust bearing elements render the prior art structure unsuitable for drilling wells of small diameter due to impossibility to ensure its reliab-le and duxable operation. This is due to the fact that the utilization of a conventional spindle unit structure when using the prior art bottom hole motor for drilling wells of small diameter calls for a reduced shaft diameter which, in turn, results in the reduction of permissible power developed by the bottom hole motor.
The choice of required shaft diameter from con-siderations of strength leads to a considerable reduction in the diameter of rolling bodies, this leading to further reduction of the service life of the bottom hole motor because of the reduced carrying capacity of the rolling bodies used.
It is the object of the present invention to develop a bottom hole motor for driving a rock-breaking tool, featuring such a structural embodiment of the spindle unit as would ensure an increased durability and reliability of the bottom hole motor operation when drill-ing wells of small diameter, as well as facilitate con-siderably the repair operations.
In accordance with the present invention, there is thus provided a bottom hole drill comprising a motor, a spindle assembly having a housing, a shaft extending through the housing and coupled at one end to the motor, a thrust bearing comprising a plurality of races and rings arranged coaxial about the shaft, and a radial roller bearing the outer races of which are formed by the races of the thrust bearing and the inner races of which comprise peripheralgrooves formed in the surface of the shaft, and a tool mounted on the other end of the shaft.
Such structural arrangement permits of increased dimensions of the rolling bodies at a fixed diameter of the shaft which allows for considerably increasing the durabi-lity of both the thrust bearing and bottom hole motor as a whole, owing to an increased carrying capacity of the rolling bodies.
It is expedient that the shaft of the spindle unit be composed of at least three rigidly interconnected portions including a middle portion provided with the toroidal grooves and two end portions interacting with the radial bearings. This helps improve considerably the quality of the shaft portion provided with grooves and simplify the manufacture of the shaft as a whole.
In addition, such a structural arrangement of the shaft renders the latter more compact, while the improved quality of toroidal grooves makes for a sharp increase of the thrust bearing life.
In order to ensure minimum contact stresses while fully ensuring the possibility of successive assembly of each specific series of the thrust bearing, as well as to maintain the shaft strength, it is expedient that the toroidal grooves for the rolling bodies have a ratio of the radius of the toroidal grooves cross-section to the inner diameter of :
- 3a -the torus lying substantially within 0.1-0.25.
The present invention will be more apparent upon considering the following detailed description of an exemplary embodiment thereof, with references to the accompanying drawings in which:
Figure 1 is a general view of a bottom hole motor for driving xock-breaking tools, according to the invention, longitudinal section, and 1~14ZS
-- 4 _ Figure 2 is a view taken along arrow A of ~ig. 1.
The herein disclosed bottom hole motor for driving rock-breaking tools comprises a motor unit 1 and a spindle unit 2. The motor unit 1 includes a body 3 ~hich accommoda-tes working members such as a helical stator 4 and a heli-cal rotor 5 mounted thereinside.
The spindle unit 2 includes a composite shaft 6 con-sisting of an adapter 7, a portion of the shaft 6 adapted to carry spherical rolling bodies 8 and made as an insert 9, and an output shaft lOt rubber-coated radial bearings 11 and a thrust bearing 12.
The thrust bearing 12 proper is a special multiple thrust-radial ball bearing includin~ outer races 13 and rings 14 interacting with the rolling bodies 8. The latter, in their turn, are in contact ~ith toroidal grooves 15 pro-vided on the outer surface of the insert 9. The outer races 13 and rinp`s 14 are tightened into a monolith set with the aid of thread provided on a housing 16 of the spindle unit
2.
In the absence of technological difficulties when manu-facturing the shaft 6, in general, and in the case of a high guality of manufacturing of the toroidal grooves 15, in Dar-ticular, the sha~t 6 is manufactured in one piece (not shown in the drawings).
The bottom hole motor for driving roc~-breaking tools o~ the present invention further comprises a coupling ele-ment 17 serving to interconnect the helical rotor 5 o~ the motor unit 1 and the shaft 6 of the spindle unit 2, and an adapter 18 over the bit. ~he bottom hole motor is suspended from a drill or tubin~ string (not shown) with the aid of an adapter 19.
The bottom hole motor of the present invention for driving rock-breaking tools operates in the following man-ner.
Drilling mud is supplied to the bottom hole motor over the inner space of drill pipes through the adapter 19. When ~assing throu~h the helical stator 4 and helical rotor 5, drilling mud acts to rotate the latter and is delivered to the bottom hole via inner holes in the adapter 7, insert 9 and output shaft 10. ~he torque developed in the motor unit 1 is transmitted from the helical rotor 5 to the shaft 6 of the spindle unit 2 via the coupling element 17.
An axial force arising in the helical rotor 5 from the hydraulic load and forces acting iD the stator-rotor ~air, as well as from the load from the bottom hol.e, is taken up by the thrust bearing 12~ while radial loads caused by unba-lance of the shaft 6 and by other factors are taken up by the rubber-coated radial bearin~s 11.
Axial loads from the insert 9 are transmitted via the rollin~ bodies 8 to the outer race 13 and further to the housing 16. The angle of contact is selected such as to en-sure the minimum contact stresses ~hile full~ ensuring the possibility of successive assembly of each s~ecific series of the thrust bearing 12~ The dimensions of the rolling bo-4~S
~, _ dies 8 and diameter of the toroidal grooves 15 are selectedfrom the same considerations, while retaining the strength of the shaft 6. It has been found that a reduction of dia-meter of the rolling bodies 8, at the same size or sli~ht increase of the toroidal grooves 15 provided on the insert 9, affects considerably the carrying capacity of the thrust bearing 12.
At the same time, as sho~n by relevant studies, a re-duction of diameter causes, along with deterioration of the carrying capacity, ~ro~ressing wear of the rolling bodies 8, especially, in open-type bearin~s such as the thrust bearing 12 of the bottom hole motor for driving a rock-breaking tool.
This ~rocess tends to get more intensive in the presence of abrasive particles in drilling mud pumped throu~h the bottom hole motor.
However, an i.ncreased size of the rollin~ bodi.es 8 may lead to a reduced safety margin of the shaft 6 when transmi.t-ting high torques whose absolute value increases sharply upon instantaneous stoppage of the shaft 6 of the bottom hole mo-tor (braking state). This imposes necessary technological li-mitations on the bottom hole motor operation (such as redu-ced flow rate of drilling mud which, in turn, results in a reduction of permissible power developed by the bottom hole motor).
Therefore, the ratio of the radius r of the cross--section of the toroidal groove 15 to its inner diameter D
should lie substantially within the 0.1-0.25 range.
The herein disclosed design of a bottom hole motor for driving a rock-breaking tool, featuring the recommended di-mensions of the toroidal ~roove 15 for the rollin~ bodies 8, provides an increased load capacity of the thrust bearing 12 owing to a more efficient utilization of the cross-sec-tional area designed to accommodate large-size rolling bod-ies 8 as com~ared with the prior art bottom hole motor thrust bearing. In addition, the assembl~ of the spindle unit 2 is facilitated owing to a small number of components in the latter and to the obviation of the need to tighten the set of inner races of the thrust bearing 12 on the shaft 6.
In the absence of technological difficulties when manu-facturing the shaft 6, in general, and in the case of a high guality of manufacturing of the toroidal grooves 15, in Dar-ticular, the sha~t 6 is manufactured in one piece (not shown in the drawings).
The bottom hole motor for driving roc~-breaking tools o~ the present invention further comprises a coupling ele-ment 17 serving to interconnect the helical rotor 5 o~ the motor unit 1 and the shaft 6 of the spindle unit 2, and an adapter 18 over the bit. ~he bottom hole motor is suspended from a drill or tubin~ string (not shown) with the aid of an adapter 19.
The bottom hole motor of the present invention for driving rock-breaking tools operates in the following man-ner.
Drilling mud is supplied to the bottom hole motor over the inner space of drill pipes through the adapter 19. When ~assing throu~h the helical stator 4 and helical rotor 5, drilling mud acts to rotate the latter and is delivered to the bottom hole via inner holes in the adapter 7, insert 9 and output shaft 10. ~he torque developed in the motor unit 1 is transmitted from the helical rotor 5 to the shaft 6 of the spindle unit 2 via the coupling element 17.
An axial force arising in the helical rotor 5 from the hydraulic load and forces acting iD the stator-rotor ~air, as well as from the load from the bottom hol.e, is taken up by the thrust bearing 12~ while radial loads caused by unba-lance of the shaft 6 and by other factors are taken up by the rubber-coated radial bearin~s 11.
Axial loads from the insert 9 are transmitted via the rollin~ bodies 8 to the outer race 13 and further to the housing 16. The angle of contact is selected such as to en-sure the minimum contact stresses ~hile full~ ensuring the possibility of successive assembly of each s~ecific series of the thrust bearing 12~ The dimensions of the rolling bo-4~S
~, _ dies 8 and diameter of the toroidal grooves 15 are selectedfrom the same considerations, while retaining the strength of the shaft 6. It has been found that a reduction of dia-meter of the rolling bodies 8, at the same size or sli~ht increase of the toroidal grooves 15 provided on the insert 9, affects considerably the carrying capacity of the thrust bearing 12.
At the same time, as sho~n by relevant studies, a re-duction of diameter causes, along with deterioration of the carrying capacity, ~ro~ressing wear of the rolling bodies 8, especially, in open-type bearin~s such as the thrust bearing 12 of the bottom hole motor for driving a rock-breaking tool.
This ~rocess tends to get more intensive in the presence of abrasive particles in drilling mud pumped throu~h the bottom hole motor.
However, an i.ncreased size of the rollin~ bodi.es 8 may lead to a reduced safety margin of the shaft 6 when transmi.t-ting high torques whose absolute value increases sharply upon instantaneous stoppage of the shaft 6 of the bottom hole mo-tor (braking state). This imposes necessary technological li-mitations on the bottom hole motor operation (such as redu-ced flow rate of drilling mud which, in turn, results in a reduction of permissible power developed by the bottom hole motor).
Therefore, the ratio of the radius r of the cross--section of the toroidal groove 15 to its inner diameter D
should lie substantially within the 0.1-0.25 range.
The herein disclosed design of a bottom hole motor for driving a rock-breaking tool, featuring the recommended di-mensions of the toroidal ~roove 15 for the rollin~ bodies 8, provides an increased load capacity of the thrust bearing 12 owing to a more efficient utilization of the cross-sec-tional area designed to accommodate large-size rolling bod-ies 8 as com~ared with the prior art bottom hole motor thrust bearing. In addition, the assembl~ of the spindle unit 2 is facilitated owing to a small number of components in the latter and to the obviation of the need to tighten the set of inner races of the thrust bearing 12 on the shaft 6.
Claims (4)
1. A bottom hole drill comprising a motor, a spindle assembly having a housing, a shaft extending through said housing and coupled at one end to said motor, a thrust bearing comprising a plurality of races and rings arranged coaxial about said shaft, and a radial roller bearing the outer races of which are formed by the races of said thrust bearing and the inner races of which comprise peripheral grooves formed in the surface of said shaft, and a tool mounted on the other end of said shaft,
2. A bottom hole drill according to claim 1, wherein said shaft is formed in sections adapted to be axially assembled, said inner races being formed on an insert forming one of said sections.
3. A bottom hole drill according to claim 1, wherein the grooves forming the inner races are toroidal.
4. A bottom hole drill according to claim 3, wherein said grooves are formed such that the ratio of the radius of the cross-section to its inner diameter lies substantially within 0.1 - 0.25.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU792804370A SU1086102A1 (en) | 1979-09-11 | 1979-09-11 | Hole-bottom engine |
| SU2804370 | 1979-09-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1161425A true CA1161425A (en) | 1984-01-31 |
Family
ID=20844075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359877A Expired CA1161425A (en) | 1979-09-11 | 1980-09-09 | Bottom hole motor for driving rock-breaking tool |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS6037278B2 (en) |
| CA (1) | CA1161425A (en) |
| DE (1) | DE3049836C2 (en) |
| ES (1) | ES8106787A1 (en) |
| FR (1) | FR2465063A1 (en) |
| GB (1) | GB2070669B (en) |
| SU (1) | SU1086102A1 (en) |
| WO (1) | WO1981000736A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277043A (en) * | 2013-05-17 | 2013-09-04 | 宜昌市五环钻机具有限责任公司 | Efficient medium-low-pressure down-hole hammer |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8503793D0 (en) * | 1985-02-14 | 1985-03-20 | Ici Plc | Treatment of seeds |
| DE3936730A1 (en) * | 1989-11-04 | 1991-05-08 | Gerhard Bihler | Direct drive for chisels to reduce motor revolutions - comprises shafts coupled to crankshafts coupled to hollow sleeve driven by rings and crank pins |
| CA2522434C (en) * | 2005-09-20 | 2010-02-16 | Wenzel Downhole Tools Ltd. | Method of adjusting backlash in a down hole bearing assembly |
| CN103615194B (en) * | 2013-12-03 | 2016-03-23 | 东营博深石油机械有限责任公司 | Helicoid hydraulic motor oil seal main shaft assembly |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2348046A (en) * | 1941-05-01 | 1944-05-02 | Smith Corp A O | Ball thrust bearing for well drilling units |
| US2641445A (en) * | 1949-11-07 | 1953-06-09 | Snyder Oil Tool Corp | Combined rotary and impact drill with fluid coupling |
| SU436944A1 (en) * | 1971-11-29 | 1974-07-25 |
-
1979
- 1979-09-11 SU SU792804370A patent/SU1086102A1/en active
-
1980
- 1980-06-30 GB GB8113395A patent/GB2070669B/en not_active Expired
- 1980-06-30 WO PCT/SU1980/000115 patent/WO1981000736A1/en active Application Filing
- 1980-06-30 JP JP55501601A patent/JPS6037278B2/en not_active Expired
- 1980-06-30 DE DE3049836T patent/DE3049836C2/en not_active Expired
- 1980-09-09 CA CA000359877A patent/CA1161425A/en not_active Expired
- 1980-09-10 FR FR8019562A patent/FR2465063A1/en active Granted
- 1980-09-11 ES ES494966A patent/ES8106787A1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277043A (en) * | 2013-05-17 | 2013-09-04 | 宜昌市五环钻机具有限责任公司 | Efficient medium-low-pressure down-hole hammer |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2465063A1 (en) | 1981-03-20 |
| ES494966A0 (en) | 1981-08-01 |
| GB2070669B (en) | 1983-03-09 |
| GB2070669A (en) | 1981-09-09 |
| JPS56501095A (en) | 1981-08-06 |
| SU1086102A1 (en) | 1984-04-15 |
| DE3049836C2 (en) | 1985-01-10 |
| WO1981000736A1 (en) | 1981-03-19 |
| ES8106787A1 (en) | 1981-08-01 |
| DE3049836T1 (en) | 1982-03-04 |
| JPS6037278B2 (en) | 1985-08-24 |
| FR2465063B1 (en) | 1984-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |