CA2023042C - Sealed downhole motor drive shaft universal joint assembly - Google Patents
Sealed downhole motor drive shaft universal joint assemblyInfo
- Publication number
- CA2023042C CA2023042C CA 2023042 CA2023042A CA2023042C CA 2023042 C CA2023042 C CA 2023042C CA 2023042 CA2023042 CA 2023042 CA 2023042 A CA2023042 A CA 2023042A CA 2023042 C CA2023042 C CA 2023042C
- Authority
- CA
- Canada
- Prior art keywords
- housing
- shaft
- end wall
- exterior surface
- drive shaft
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims description 5
- 239000011797 cavity material Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 2
- SUBDBMMJDZJVOS-UHFFFAOYSA-N 5-methoxy-2-{[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulfinyl}-1H-benzimidazole Chemical compound N=1C2=CC(OC)=CC=C2NC=1S(=O)CC1=NC=C(C)C(OC)=C1C SUBDBMMJDZJVOS-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035515 penetration Effects 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Motor Or Generator Frames (AREA)
- Earth Drilling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A Sealed Downhole Motor Drive Shaft Universal Joint Assembly consisting of a housing with an interior and an exterior surface. The interior has an end wall and side walls. The end wall has an elongate projection with a concave terminus. The side walls have a plurality of slots.
A shaft is provided having an exterior surface and opposed ends. Each of the ends has a central cavity with a substantially concave end wall. The exterior surface of the drive shaft has a plurality of annularly spaced pockets adjacent each end. The pockets are in substantial alignment with the end wall of the central cavity. Each end of the drive shaft is telescopically received within one of the housings. A thrust ball is positioned between the concave terminus of the elongate projection of the housing and the concave end wall of the central cavity of the shaft thereby transmitting thrust loads between the housing and the shaft while permitting omni-directional relative movement of the housing and the shaft. A plurality of ball bearings are positioned in the pockets of the shaft and the slots of the housing thereby transmitting radial loads between the housing and the shaft while permitting omni-directional relative movement of the housing and the shaft. An end cap engages the external surface of the housing thereby preventing the separation of the shaft and the housing. Seals are disposed between the end cap and the housing to prevent the entry of drilling fluids into the housing.
A Sealed Downhole Motor Drive Shaft Universal Joint Assembly consisting of a housing with an interior and an exterior surface. The interior has an end wall and side walls. The end wall has an elongate projection with a concave terminus. The side walls have a plurality of slots.
A shaft is provided having an exterior surface and opposed ends. Each of the ends has a central cavity with a substantially concave end wall. The exterior surface of the drive shaft has a plurality of annularly spaced pockets adjacent each end. The pockets are in substantial alignment with the end wall of the central cavity. Each end of the drive shaft is telescopically received within one of the housings. A thrust ball is positioned between the concave terminus of the elongate projection of the housing and the concave end wall of the central cavity of the shaft thereby transmitting thrust loads between the housing and the shaft while permitting omni-directional relative movement of the housing and the shaft. A plurality of ball bearings are positioned in the pockets of the shaft and the slots of the housing thereby transmitting radial loads between the housing and the shaft while permitting omni-directional relative movement of the housing and the shaft. An end cap engages the external surface of the housing thereby preventing the separation of the shaft and the housing. Seals are disposed between the end cap and the housing to prevent the entry of drilling fluids into the housing.
Description
~`~ 2~2~
: .
THe pres~rJI: inverlt;oiJ I~l~te~i to ~ Seale(3 Dov~rlllole Motor Drive Shaft Universal Joint Assembly.
BAC~GROUND OF THE INVENTION
, 5 Tlle output shaft of a Dowrlhole motcr used wit~lin -~ the oil industry for earth borirly operations moves in an ;~ eccell-tric fashiorl. This eccelltric movemerlt must be converted into a concerltric movement for the drill bit to perform its intended functiorl. At -the present time 10 thi~ conversion is accomplished by means of a drive s~laf-t havirly universal joint connectiorls which connects the downhole motor to a bearing assembly rotating the drill bit, The penetration of abrasive drilling fluids into the drive shaft universal joint assembly has an adverse effect on the operational life of the drive shafts. In order to prolong this operational life, attempts have been made to seal the universal joint assernblies. The ¦20 universal joirlt as9emblies of most drive shafts do not ,~readily lend t~lemselves to sealiny. It has therefore come to be the practise to secure a lubricant filled ¦rubber sleeve over the universal joint. This sleeve has a number of recogniYed disadvantages. It is common for 25 it to slide out of positiorl, where it can become damaged 80 it no longer serves its interlded function, or can move into a position where it interferes with drilliny operations.
What is required is a sealed d;rive shaft universal joint assembly.
According to the invention there is provided a Sealed Downhole Motor Drive Shaft Universal Joint ' . :, '. ' ' : ~' '', , .
' ' , . ' .
' ' ~ ' .
~ 2023042 ., ~
A';~ y, wn:ich iS cc~mLJr:ic;ed o.F a holl6irlg with an irl-terior and arl exterior surface. T~le interior ha~ an en~ wall arl~ sicle walls. The end wall ha~ an elorlgate I pro jec~ion with d ~ollcave termirlus. The side walls have a plural;-ty of ~loL~. A shaft is provi~ed ~lavirlc3 an exterior surface and opposed encls. Each of the ends has a central cavity with a ~ub~tantially concave e~ld wall.
The exterior ~urIace of the drive snaft has a plurality of anrlularly spaced pockets adjacellt each eJl~. The ,,10 pocket~ are in substantial alignment with the end wall of the central cavity. Each end o~ the drive shaft is telescopically received withi~ one of the housings. A
thrust ball ;s po~itioned between the concave termirlu6 of the elongate projectioil of the housirlg and the lS concave end wall of the central cavity of the shaf-t thereby trarlsmittirly thrust loads between the housirlg and the shaft while permit-ting limited omni-directiorlal relative movement of the housirlg and the shaft. A
plurality of hall bearinys are positioned in the 20 annularly spaced pockets of the shaft and the arcuate slo-ts of the housirly thereby trarlsmittirly radial ~.oads between the housing and the shaft while permittiny omni-directional relative movement of the housiny and the shaft. An end cap enyages the external ~urface of the 25 housing thereby preverltirlg the separation of -the shaft and the housing. Seals are disposed between -the end cap and the housing to preverl-t the entry oE drill:irlg Eluids into the housirlg.
Although beneficial results may be obtairled throuyh the use of the drive shaft universal joint assembly as described, seal wear occurs whenever the pressures on opposite faces of a seal are unequal. Even more 35 berleficial results may therefore be obtairled by havirlg a passage extending though the housing such that drilling ~ .
~ 2023042 fluids e;lter the passage -th~:reby creatiny arl interrlal presYure withirl the lubricarl-t filled in~e-rior of the hOUsi.rly which is equal to ex-ternal E~ressur~.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more appa:rerlt from the following description in which reference is made to the appended drawing~, whereirl:
FIGURE 1 is a lonyi-tudillal section view uf a downhole drive shaft universal joint asselnbly made in accordance wi-th the inventiorl.
FIGURE 2 is a longit-udinal sectiorl view of a por-tion of the downhole drive shaft universal joint 15 assembly illust:rated in FIGURE 1.
DETAILED DESCRIPTION OF_THE PREFERRED EMBODIMENT
The invention, a ~ealed downhole drive shaft universal joint assembly gerlerally identified by 20 reference numeral 10, will now be described with reference to FIGURES 1 arld 2. The primary componerlts of sealed downhole drive shaft universal joint assembly 10 are a shaft 12, a pair of housinys 14, and an end cap 16.
Each of housirlgs 14 have an interior 18 and an exterior surface 20. Interior 18 is defined by an end wall 22 and ~ide walls 24. End wall 22 has an elorlyate projection 26 with a concave terminus 28. Side wall9 24 30 have a plurali-ty of lorlgitudirlally extendirly slots 30.
Shaft 12 has an exterior surface 32 and opposed ends 34 and 36. Each of ends 34 and 36 has a central 35 cavity 38 with a substantially concave end wall 40.
Exter.ior surface 32 of s~laft 12 has a plurali-ty of ,,,,,,,.,, ... ,. : ,' .
: , arlIIularly spaced poc:kets 42 adjacent each of ends 34 and 36. Anrlularly spaced pockets 42 are in substarltial aliynment with end wall 40 of central cavity 38. Each of end~ 34 ar-d 36 of shaft 12 are telescopically 5 I'eCeiVeCl Wi thin d housir1ys 14.
A thrust ball 44 is positior1ed between concave terminus 28 of elongate projection 26 of ho~si~ly 14 and concave end wall ~0 of central cavity 38 of shaft 12. A
10 plurality of ball bearings 46 are positioned in annularly spa~ed pockets 42 of shaft i2 and slots 30 of housiny 14.
End cap 16 enyages external ~urface 20 of hou~irlg 15 14 by means of a mating threaded engagemerlt 48.
Polypack seals S0 are disposed between an annular shoulder 52 of end cap 16 and housirlg 14. Shoulder 52 has a plurality of cavi-ties 54 in which are disposed spring s 56 which urge seals 50 into sealing engagement 20 with housing 14. A passa~e 58 extends through housirlg 14.
The use and operatiorl of downhole drive shaft universal joint a~sembly will now be described with 25 reference to FIGURES 1 and 2. In operation thrust ball 44 transmits thrust loads between housirlg 14 and shaft 12 while permittirlg limi-ted omni-direc-tiorlal relative movement of housirlg 14 and shaft 12. Thi~ is possible due to the slidirlg corl-tact betweell thrust ball 44 and 30 the concave surfaces which it engages; namely, concave terminus 28 and concave end wall 40. Isl operation, ball bearings 46 transmit radial loads between housing 14 and shaft 12 while perm.i-ttirly limited omni-directiorlal 35 relative movement of housing 14 and shaft 12. This is possible due to the sliding contact between ball ~A~ ~k .. . ..
~ .
- `,,:
~ 2023042 bearinys ~6 an~ the surface6 which corlcairl the~n; namely, slots 30 and pockets 42. ~nd cap 16 prevents the separation oE shaLt 12 and hou~irly 14. Seals 50 prevent the entry of drilliny fluid~ into interior 18 of housirlg 5 14. Passage 58 serves a pressure balancis~g function.
Interior 18 of housirlg 14 is filled with a thick lubricant. Drilling fluids enter passaye 58 and exert a pre~sure upon the lubricant. This creates an internal pressure within the lubricant filled interior 18 of 1~ housing 14 which is equal to external pressure.
It will be apparent to one skilled in the art that the present inventiorl represents an improvement over the rubber sleeve method of sealing prevalent in the art.
15 It will also be apparent to one skilled in the art that modificatiorls may be made to the illustrated embodiment without departing from the spirit and scope of the invention.
- - . . .-: :
: .
THe pres~rJI: inverlt;oiJ I~l~te~i to ~ Seale(3 Dov~rlllole Motor Drive Shaft Universal Joint Assembly.
BAC~GROUND OF THE INVENTION
, 5 Tlle output shaft of a Dowrlhole motcr used wit~lin -~ the oil industry for earth borirly operations moves in an ;~ eccell-tric fashiorl. This eccelltric movemerlt must be converted into a concerltric movement for the drill bit to perform its intended functiorl. At -the present time 10 thi~ conversion is accomplished by means of a drive s~laf-t havirly universal joint connectiorls which connects the downhole motor to a bearing assembly rotating the drill bit, The penetration of abrasive drilling fluids into the drive shaft universal joint assembly has an adverse effect on the operational life of the drive shafts. In order to prolong this operational life, attempts have been made to seal the universal joint assernblies. The ¦20 universal joirlt as9emblies of most drive shafts do not ,~readily lend t~lemselves to sealiny. It has therefore come to be the practise to secure a lubricant filled ¦rubber sleeve over the universal joint. This sleeve has a number of recogniYed disadvantages. It is common for 25 it to slide out of positiorl, where it can become damaged 80 it no longer serves its interlded function, or can move into a position where it interferes with drilliny operations.
What is required is a sealed d;rive shaft universal joint assembly.
According to the invention there is provided a Sealed Downhole Motor Drive Shaft Universal Joint ' . :, '. ' ' : ~' '', , .
' ' , . ' .
' ' ~ ' .
~ 2023042 ., ~
A';~ y, wn:ich iS cc~mLJr:ic;ed o.F a holl6irlg with an irl-terior and arl exterior surface. T~le interior ha~ an en~ wall arl~ sicle walls. The end wall ha~ an elorlgate I pro jec~ion with d ~ollcave termirlus. The side walls have a plural;-ty of ~loL~. A shaft is provi~ed ~lavirlc3 an exterior surface and opposed encls. Each of the ends has a central cavity with a ~ub~tantially concave e~ld wall.
The exterior ~urIace of the drive snaft has a plurality of anrlularly spaced pockets adjacellt each eJl~. The ,,10 pocket~ are in substantial alignment with the end wall of the central cavity. Each end o~ the drive shaft is telescopically received withi~ one of the housings. A
thrust ball ;s po~itioned between the concave termirlu6 of the elongate projectioil of the housirlg and the lS concave end wall of the central cavity of the shaf-t thereby trarlsmittirly thrust loads between the housirlg and the shaft while permit-ting limited omni-directiorlal relative movement of the housirlg and the shaft. A
plurality of hall bearinys are positioned in the 20 annularly spaced pockets of the shaft and the arcuate slo-ts of the housirly thereby trarlsmittirly radial ~.oads between the housing and the shaft while permittiny omni-directional relative movement of the housiny and the shaft. An end cap enyages the external ~urface of the 25 housing thereby preverltirlg the separation of -the shaft and the housing. Seals are disposed between -the end cap and the housing to preverl-t the entry oE drill:irlg Eluids into the housirlg.
Although beneficial results may be obtairled throuyh the use of the drive shaft universal joint assembly as described, seal wear occurs whenever the pressures on opposite faces of a seal are unequal. Even more 35 berleficial results may therefore be obtairled by havirlg a passage extending though the housing such that drilling ~ .
~ 2023042 fluids e;lter the passage -th~:reby creatiny arl interrlal presYure withirl the lubricarl-t filled in~e-rior of the hOUsi.rly which is equal to ex-ternal E~ressur~.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more appa:rerlt from the following description in which reference is made to the appended drawing~, whereirl:
FIGURE 1 is a lonyi-tudillal section view uf a downhole drive shaft universal joint asselnbly made in accordance wi-th the inventiorl.
FIGURE 2 is a longit-udinal sectiorl view of a por-tion of the downhole drive shaft universal joint 15 assembly illust:rated in FIGURE 1.
DETAILED DESCRIPTION OF_THE PREFERRED EMBODIMENT
The invention, a ~ealed downhole drive shaft universal joint assembly gerlerally identified by 20 reference numeral 10, will now be described with reference to FIGURES 1 arld 2. The primary componerlts of sealed downhole drive shaft universal joint assembly 10 are a shaft 12, a pair of housinys 14, and an end cap 16.
Each of housirlgs 14 have an interior 18 and an exterior surface 20. Interior 18 is defined by an end wall 22 and ~ide walls 24. End wall 22 has an elorlyate projection 26 with a concave terminus 28. Side wall9 24 30 have a plurali-ty of lorlgitudirlally extendirly slots 30.
Shaft 12 has an exterior surface 32 and opposed ends 34 and 36. Each of ends 34 and 36 has a central 35 cavity 38 with a substantially concave end wall 40.
Exter.ior surface 32 of s~laft 12 has a plurali-ty of ,,,,,,,.,, ... ,. : ,' .
: , arlIIularly spaced poc:kets 42 adjacent each of ends 34 and 36. Anrlularly spaced pockets 42 are in substarltial aliynment with end wall 40 of central cavity 38. Each of end~ 34 ar-d 36 of shaft 12 are telescopically 5 I'eCeiVeCl Wi thin d housir1ys 14.
A thrust ball 44 is positior1ed between concave terminus 28 of elongate projection 26 of ho~si~ly 14 and concave end wall ~0 of central cavity 38 of shaft 12. A
10 plurality of ball bearings 46 are positioned in annularly spa~ed pockets 42 of shaft i2 and slots 30 of housiny 14.
End cap 16 enyages external ~urface 20 of hou~irlg 15 14 by means of a mating threaded engagemerlt 48.
Polypack seals S0 are disposed between an annular shoulder 52 of end cap 16 and housirlg 14. Shoulder 52 has a plurality of cavi-ties 54 in which are disposed spring s 56 which urge seals 50 into sealing engagement 20 with housing 14. A passa~e 58 extends through housirlg 14.
The use and operatiorl of downhole drive shaft universal joint a~sembly will now be described with 25 reference to FIGURES 1 and 2. In operation thrust ball 44 transmits thrust loads between housirlg 14 and shaft 12 while permittirlg limi-ted omni-direc-tiorlal relative movement of housirlg 14 and shaft 12. Thi~ is possible due to the slidirlg corl-tact betweell thrust ball 44 and 30 the concave surfaces which it engages; namely, concave terminus 28 and concave end wall 40. Isl operation, ball bearings 46 transmit radial loads between housing 14 and shaft 12 while perm.i-ttirly limited omni-directiorlal 35 relative movement of housing 14 and shaft 12. This is possible due to the sliding contact between ball ~A~ ~k .. . ..
~ .
- `,,:
~ 2023042 bearinys ~6 an~ the surface6 which corlcairl the~n; namely, slots 30 and pockets 42. ~nd cap 16 prevents the separation oE shaLt 12 and hou~irly 14. Seals 50 prevent the entry of drilliny fluid~ into interior 18 of housirlg 5 14. Passage 58 serves a pressure balancis~g function.
Interior 18 of housirlg 14 is filled with a thick lubricant. Drilling fluids enter passaye 58 and exert a pre~sure upon the lubricant. This creates an internal pressure within the lubricant filled interior 18 of 1~ housing 14 which is equal to external pressure.
It will be apparent to one skilled in the art that the present inventiorl represents an improvement over the rubber sleeve method of sealing prevalent in the art.
15 It will also be apparent to one skilled in the art that modificatiorls may be made to the illustrated embodiment without departing from the spirit and scope of the invention.
- - . . .-: :
Claims
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A Sealed Downhole Motor Drive Shaft Universal Joint Assembly, comprising:
a. a housing with an interior and an exterior surface, the interior having an end wall and side walls, the end wall having an elongate projection with a concave terminus, the side walls having a plurality of slots;
b. a shaft with an exterior surface and opposed ends, each of the ends having a central cavity with a substantially concave end wall, the exterior surface of the drive shaft having a plurality of radially spaced pockets adjacent each end in substantial alignment with the end wall of the central cavity, the drive shaft being telescopically received within the housing with the central cavity in axial alignment with the elongate projection in the housing;
c. a thrust ball positioned between the concave terminus of the elongate projection of the housing and the concave end wall of the central cavity of the shaft thereby transmitting thrust loads between the housing and the shaft while permitting limited omni-directional relative movement of the housing and the shaft;
d. a plurality of ball bearings positioned in the radially spaced pockets of the shaft and the slots of the housing thereby transmitting radial loads between the housing and the shaft while permitting limited omni-directional relative movement of the housing and the shaft;
e. an annular end cap engages the exterior surface of the housing, the end cap engaging the end of the shaft upon an axial force being exerted thereby preventing the axial separation of the shaft and the housing;
f. seals disposed between the end cap and the housing to prevent the entry of drilling fluids into the housing; and g. a passage extending from the housing exterior surface through the housing to the housing end wall, for continuously allowing, in use, drilling fluids to enter the passage thereby creating an internal pressure within the lubricant filled interior of the housing which is equal to pressure external of the universal joint housing.
a. a housing with an interior and an exterior surface, the interior having an end wall and side walls, the end wall having an elongate projection with a concave terminus, the side walls having a plurality of slots;
b. a shaft with an exterior surface and opposed ends, each of the ends having a central cavity with a substantially concave end wall, the exterior surface of the drive shaft having a plurality of radially spaced pockets adjacent each end in substantial alignment with the end wall of the central cavity, the drive shaft being telescopically received within the housing with the central cavity in axial alignment with the elongate projection in the housing;
c. a thrust ball positioned between the concave terminus of the elongate projection of the housing and the concave end wall of the central cavity of the shaft thereby transmitting thrust loads between the housing and the shaft while permitting limited omni-directional relative movement of the housing and the shaft;
d. a plurality of ball bearings positioned in the radially spaced pockets of the shaft and the slots of the housing thereby transmitting radial loads between the housing and the shaft while permitting limited omni-directional relative movement of the housing and the shaft;
e. an annular end cap engages the exterior surface of the housing, the end cap engaging the end of the shaft upon an axial force being exerted thereby preventing the axial separation of the shaft and the housing;
f. seals disposed between the end cap and the housing to prevent the entry of drilling fluids into the housing; and g. a passage extending from the housing exterior surface through the housing to the housing end wall, for continuously allowing, in use, drilling fluids to enter the passage thereby creating an internal pressure within the lubricant filled interior of the housing which is equal to pressure external of the universal joint housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2023042 CA2023042C (en) | 1990-08-09 | 1990-08-09 | Sealed downhole motor drive shaft universal joint assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2023042 CA2023042C (en) | 1990-08-09 | 1990-08-09 | Sealed downhole motor drive shaft universal joint assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2023042A1 CA2023042A1 (en) | 1991-03-13 |
| CA2023042C true CA2023042C (en) | 1994-04-12 |
Family
ID=4145699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2023042 Expired - Lifetime CA2023042C (en) | 1990-08-09 | 1990-08-09 | Sealed downhole motor drive shaft universal joint assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2023042C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8900062B2 (en) | 2013-02-13 | 2014-12-02 | National Oilwell Varco, L.P. | Driveshaft assembly for a downhole motor |
| US9404527B2 (en) | 2013-04-09 | 2016-08-02 | National Oilwell Varco, L.P | Drive shaft assembly for a downhole motor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6561290B2 (en) | 2001-01-12 | 2003-05-13 | Performance Boring Technologies, Inc. | Downhole mud motor |
| WO2009132414A1 (en) * | 2008-04-30 | 2009-11-05 | Dreco Energy Services Ltd. | Drive shaft assembly for a downhole motor |
-
1990
- 1990-08-09 CA CA 2023042 patent/CA2023042C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8900062B2 (en) | 2013-02-13 | 2014-12-02 | National Oilwell Varco, L.P. | Driveshaft assembly for a downhole motor |
| US9404527B2 (en) | 2013-04-09 | 2016-08-02 | National Oilwell Varco, L.P | Drive shaft assembly for a downhole motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2023042A1 (en) | 1991-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |