CA2308679A1 - Drilling tool - Google Patents
Drilling tool Download PDFInfo
- Publication number
- CA2308679A1 CA2308679A1 CA 2308679 CA2308679A CA2308679A1 CA 2308679 A1 CA2308679 A1 CA 2308679A1 CA 2308679 CA2308679 CA 2308679 CA 2308679 A CA2308679 A CA 2308679A CA 2308679 A1 CA2308679 A1 CA 2308679A1
- Authority
- CA
- Canada
- Prior art keywords
- carrier ring
- seal carrier
- wall
- recess
- 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.)
- Abandoned
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 22
- 230000008878 coupling Effects 0.000 claims abstract description 15
- 238000010168 coupling process Methods 0.000 claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
-
- 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)
- Sealing Devices (AREA)
Abstract
A drilling tool is formed from a drive shaft having a coupling end, the coupling end having a cylindrical portion, an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket, and an annular recess formed in the encircling wall of the adapter housing. A seal carrier ring is seated in the annular recess. The seal carrier ring is radially movable within the annular recess, with the seal carrier ring sealed to the encircling wall to form a sliding seal. The seal carrier ring is also axially slidable on and sealed to the drive shaft.
The arrangement permits eccentric movement of the drive shaft within the adapter housing without being prone to leakage around the seal carrier ring.
The arrangement permits eccentric movement of the drive shaft within the adapter housing without being prone to leakage around the seal carrier ring.
Description
TITLE OF THE INVENTION
Drilling Tool NAME OF INVENTOR
Manuel Balsa FIELD OF THE INVENTION
This invention relates to downhole drilling tools, and in particular a joint or rotor adapter for use in connecting eccentric rotation of a rotor to a drive shaft.
BACKGROUND OF THE INVENTION
Rotor adapters are used on either end of a drive shaft to connect eccentric motion of a motor to circular motion of a drill bit. The drive shaft is permitted to rotate with its central axis sweeping out a conical figure, while an adapter housing connected to a drill bit rotates with a circular motion. In these rotor adapters, the drive shaft is received in a socket formed as part of the adapter housing. To prevent fluids in the well bore from entering the socket, an elastomeric seal, seated in an annular recess in the socket, seals to both the socket and the drive shaft. As the drive shaft executes its conical motion in the socket, it presses on different sides of the elastomeric seal.
Drilling Tool NAME OF INVENTOR
Manuel Balsa FIELD OF THE INVENTION
This invention relates to downhole drilling tools, and in particular a joint or rotor adapter for use in connecting eccentric rotation of a rotor to a drive shaft.
BACKGROUND OF THE INVENTION
Rotor adapters are used on either end of a drive shaft to connect eccentric motion of a motor to circular motion of a drill bit. The drive shaft is permitted to rotate with its central axis sweeping out a conical figure, while an adapter housing connected to a drill bit rotates with a circular motion. In these rotor adapters, the drive shaft is received in a socket formed as part of the adapter housing. To prevent fluids in the well bore from entering the socket, an elastomeric seal, seated in an annular recess in the socket, seals to both the socket and the drive shaft. As the drive shaft executes its conical motion in the socket, it presses on different sides of the elastomeric seal.
2 0 Particularly as the elastomeric seal ages and loses its elasticity, when the drive shaft presses on one side of the elastomeric seal, it may disengage from the elastomeric seal at the portion of the seal diametrically opposite to where it presses on the elastomeric seal. As the drive shaft disengages from the elastomeric seal, fluid from the well bore may enter the socket and thus cause wear and reduce the longevity of the rotor adapter.
2 5 A design of a rotor adapter is shown in United States patent no. 5,000,723 issued March 19, 1991, and Canadian patent no. 1,327,790 issued March 15, 1994, although the elastomeric seal (which is cup shaped in cross-section and faces inward) is not shown.
It is an object of this invention to improve upon this design of rotor adapter.
SUMMARY OF THE INVENTION
There is therefore provided in accordance with an aspect of the invention, a drilling tool, comprising a drive shaft having a coupling end, the coupling end having a cylindrical portion, an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket, and an annular recess formed in the encircling wall of the adapter housing. A seal carrier ring is seated in the annular recess. The seal Garner ring is radially movable within the annular recess, with the seal Garner ring sealed to the encircling wall to form a sliding seal. The seal carrier ring is also axially slidable on and sealed to the drive shaft.
According to a further aspect of the invention, the seal carrier ring is sealed to the encircling wall by a top O-ring seated in a recess in a top wall of the seal Garner ring and/or by a bottom O-ring seated in a recess in the bottom wall of the seal carrier ring.
According to a further aspect of the invention, the seal carrier ring is sealed against the cylindrical portion of the drive shaft by an O-ring seated in a recess in an inner wall of the seal carrier ring.
According to a further aspect of the invention, the inner wall of the seal carrier ring is bevelled to form an obtuse angle with the top wall of the seal carrier ring and the bottom wall of the seal carrier ring, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
2 0 Preferably the housing adapter is formed of two parts which together define the recess, one of the parts acting as a removable cap.
These and other aspects of the invention are described in the detailed description of the invention and claimed in the claims that follow.
There will now be described preferred embodiments of the invention, with reference to the drawings, by way of illustration only and not with the intention of limiting the scope of the invention, in which like numerals denote like elements and in which:
2 5 A design of a rotor adapter is shown in United States patent no. 5,000,723 issued March 19, 1991, and Canadian patent no. 1,327,790 issued March 15, 1994, although the elastomeric seal (which is cup shaped in cross-section and faces inward) is not shown.
It is an object of this invention to improve upon this design of rotor adapter.
SUMMARY OF THE INVENTION
There is therefore provided in accordance with an aspect of the invention, a drilling tool, comprising a drive shaft having a coupling end, the coupling end having a cylindrical portion, an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket, and an annular recess formed in the encircling wall of the adapter housing. A seal carrier ring is seated in the annular recess. The seal Garner ring is radially movable within the annular recess, with the seal Garner ring sealed to the encircling wall to form a sliding seal. The seal carrier ring is also axially slidable on and sealed to the drive shaft.
According to a further aspect of the invention, the seal carrier ring is sealed to the encircling wall by a top O-ring seated in a recess in a top wall of the seal Garner ring and/or by a bottom O-ring seated in a recess in the bottom wall of the seal carrier ring.
According to a further aspect of the invention, the seal carrier ring is sealed against the cylindrical portion of the drive shaft by an O-ring seated in a recess in an inner wall of the seal carrier ring.
According to a further aspect of the invention, the inner wall of the seal carrier ring is bevelled to form an obtuse angle with the top wall of the seal carrier ring and the bottom wall of the seal carrier ring, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
2 0 Preferably the housing adapter is formed of two parts which together define the recess, one of the parts acting as a removable cap.
These and other aspects of the invention are described in the detailed description of the invention and claimed in the claims that follow.
There will now be described preferred embodiments of the invention, with reference to the drawings, by way of illustration only and not with the intention of limiting the scope of the invention, in which like numerals denote like elements and in which:
Fig. 1 is a section through an embodiment of the invention with the drive shaft centrally located in the receiving socket;
Fig. 2 is a section of the embodiment of Fig. 1 showing the drive shaft moved to one side; and Fig. 3 is a detailed section through the seal carrier ring shown in Figs. 1 and 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word in the sentence are included and that items not specifically mentioned are not excluded. The use of the indefinite article "a"
in the claims before an element means that one of the elements is specified, but does not specifically exclude others of the elements being present, unless the context clearly requires that there be one and only one of the elements.
Referring to Figs. l and 2, there is shown a drilling tool 10, comprising a drive shaft 12 having a coupling end 14 and an adapter housing 20. The coupling end 14 is cylindrical over a portion of the drive shaft 12 adjacent seal Garner ring 18.
The adapter housing 20 is formed from two parts, a main portion 22 and a cap 23, but both together are considered to constitute the adapter housing 20. The cap 23 is threaded onto the main portion 22. The adapter housing 20 has an encircling wall 24 defining a socket.
2 0 The coupling end 14 of the drive shaft 12 is received by the socket. An annular recess 26 is formed in the encircling wall 24 of the adapter housing 20. A seal carrier ring 18 is seated in the annular recess 26, where it is held by the cap 23. The seal Garner ring 18 is radially movable within the annular recess 26, with the seal carrier ring 18 sealed to the encircling wall by O-rings 30a and 30b to form a sliding seal. The seal Garner ring 18 is 2 5 also axially slidable on and sealed to the drive shaft 12 by O-ring 30c.
Refernng also to Fig. 3, O-ring 30a is seated in a recess 32a in a top wall 34 of the seal Garner ring 18 and contacts top wall 36 of the recess 26. The top wall 36 is part of the cap 23. O-ring 30b is seated in a recess 32b in the bottom wall 38 of the seal carrier ring 18 and contacts bottom wall 40 of the recess 26. The bottom wall 40 is part of the main portion 22 of the adapter housing 20. The seal carrier ring 18 is sealed against the cylindrical portion 16 of the drive shaft 12 by an O-ring 30c seated in a recess 32c in an inner wall 42 of the seal carrier ring 18. To permit radial movement of the seal carrier ring 18 in the recess 26, the outer wall 44 of the seal carrier ring 18 should have a smaller diameter than the diameter of the outer wall 46 of the recess 26.
The difference in the two diameters should be sufficient to accommodate the eccentric motion of the drive shaft 12. Fig. 2 shows how the drive shaft 12 may move in the adapter housing 20. The eccentric motion of the drive sha$ 12, which results in the central axis of the drive shaft 12 sweeping out a cone, shows up as lateral movement between the positions shown in Figs. 1 and 2.
The inner wall 42 of the seal Garner ring 18 is bevelled as shown in Fig. 3 to form an obtuse angle with the top wall 34 of the seal Garner ring 18 and the bottom wall 38 of the seal carrier ring 18, thereby to permit eccentric movement of the drive shaft within the seal carrier ring while allowing clearance between the seal Garner ring 18 and the drive sha$ 12.
The metallic components (adapter housing 20, drive shaft 12, seal carrier ring 18) are all made from conventional metals used in the oil industry. The O-rings are all elastomeric components, likewise available in the oil industry.
A person skilled in the art could make immaterial modifications to the invention 2 0 described in this patent document without departing from the essence of the invention that is intended to be covered by the scope of the claims that follow.
Fig. 2 is a section of the embodiment of Fig. 1 showing the drive shaft moved to one side; and Fig. 3 is a detailed section through the seal carrier ring shown in Figs. 1 and 2.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word in the sentence are included and that items not specifically mentioned are not excluded. The use of the indefinite article "a"
in the claims before an element means that one of the elements is specified, but does not specifically exclude others of the elements being present, unless the context clearly requires that there be one and only one of the elements.
Referring to Figs. l and 2, there is shown a drilling tool 10, comprising a drive shaft 12 having a coupling end 14 and an adapter housing 20. The coupling end 14 is cylindrical over a portion of the drive shaft 12 adjacent seal Garner ring 18.
The adapter housing 20 is formed from two parts, a main portion 22 and a cap 23, but both together are considered to constitute the adapter housing 20. The cap 23 is threaded onto the main portion 22. The adapter housing 20 has an encircling wall 24 defining a socket.
2 0 The coupling end 14 of the drive shaft 12 is received by the socket. An annular recess 26 is formed in the encircling wall 24 of the adapter housing 20. A seal carrier ring 18 is seated in the annular recess 26, where it is held by the cap 23. The seal Garner ring 18 is radially movable within the annular recess 26, with the seal carrier ring 18 sealed to the encircling wall by O-rings 30a and 30b to form a sliding seal. The seal Garner ring 18 is 2 5 also axially slidable on and sealed to the drive shaft 12 by O-ring 30c.
Refernng also to Fig. 3, O-ring 30a is seated in a recess 32a in a top wall 34 of the seal Garner ring 18 and contacts top wall 36 of the recess 26. The top wall 36 is part of the cap 23. O-ring 30b is seated in a recess 32b in the bottom wall 38 of the seal carrier ring 18 and contacts bottom wall 40 of the recess 26. The bottom wall 40 is part of the main portion 22 of the adapter housing 20. The seal carrier ring 18 is sealed against the cylindrical portion 16 of the drive shaft 12 by an O-ring 30c seated in a recess 32c in an inner wall 42 of the seal carrier ring 18. To permit radial movement of the seal carrier ring 18 in the recess 26, the outer wall 44 of the seal carrier ring 18 should have a smaller diameter than the diameter of the outer wall 46 of the recess 26.
The difference in the two diameters should be sufficient to accommodate the eccentric motion of the drive shaft 12. Fig. 2 shows how the drive shaft 12 may move in the adapter housing 20. The eccentric motion of the drive sha$ 12, which results in the central axis of the drive shaft 12 sweeping out a cone, shows up as lateral movement between the positions shown in Figs. 1 and 2.
The inner wall 42 of the seal Garner ring 18 is bevelled as shown in Fig. 3 to form an obtuse angle with the top wall 34 of the seal Garner ring 18 and the bottom wall 38 of the seal carrier ring 18, thereby to permit eccentric movement of the drive shaft within the seal carrier ring while allowing clearance between the seal Garner ring 18 and the drive sha$ 12.
The metallic components (adapter housing 20, drive shaft 12, seal carrier ring 18) are all made from conventional metals used in the oil industry. The O-rings are all elastomeric components, likewise available in the oil industry.
A person skilled in the art could make immaterial modifications to the invention 2 0 described in this patent document without departing from the essence of the invention that is intended to be covered by the scope of the claims that follow.
Claims (15)
1. A drilling tool, comprising:
a drive shaft having a coupling end, the coupling end having a cylindrical portion;
an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket;
an annular recess formed in the encircling wall of the adapter housing;
a seal carrier ring seated in the annular recess, the seal carrier ring being radially movable within the annular recess, and the seal carrier ring forming a sliding seal with the encircling wall of the adapter housing; and the seal carrier ring sealed against the cylindrical portion of the drive shaft with a sliding seal permitting axial movement of the seal carrier ring along the drive shaft.
a drive shaft having a coupling end, the coupling end having a cylindrical portion;
an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket;
an annular recess formed in the encircling wall of the adapter housing;
a seal carrier ring seated in the annular recess, the seal carrier ring being radially movable within the annular recess, and the seal carrier ring forming a sliding seal with the encircling wall of the adapter housing; and the seal carrier ring sealed against the cylindrical portion of the drive shaft with a sliding seal permitting axial movement of the seal carrier ring along the drive shaft.
2. The drilling tool of claim 1 in which:
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall;
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the seal carrier ring is sealed to the encircling wall by a top recess seal formed between the top seal carrier ring wall and the top recess wall.
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall;
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the seal carrier ring is sealed to the encircling wall by a top recess seal formed between the top seal carrier ring wall and the top recess wall.
3. The drilling tool of claim 2 in which the top recess seal is formed by an O-ring carried in a recess formed in the top seal carrier ring wall.
4. The drilling tool of claim 2 in which the seal carrier ring is sealed to the encircling wall by a bottom seal formed between the bottom seal carrier ring wall and the bottom recess wall.
5. The drilling tool of claim 4 in which the bottom seal is formed by an O-ring carried in a recess formed in the bottom seal carrier ring wall.
6. The drilling tool of claim 1 in which:
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall;
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the seal carrier ring is sealed to the encircling wall by a bottom seal formed between the bottom seal carrier ring wall and the bottom recess wall.
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall;
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the seal carrier ring is sealed to the encircling wall by a bottom seal formed between the bottom seal carrier ring wall and the bottom recess wall.
7. The drilling tool of claim 1 in which:
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall;
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the seal carrier ring is sealed to the drive shaft by a drive shaft seal formed between the inner seal carrier ring wall and the cylindrical portion of the drive shaft.
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall;
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the seal carrier ring is sealed to the drive shaft by a drive shaft seal formed between the inner seal carrier ring wall and the cylindrical portion of the drive shaft.
8. The drilling tool of claim 8 in which the drive shaft seal is formed by an O-ring carried in an inner seal carrier ring recess in the inner seal carrier ring wall.
9. The drilling tool of claim 1 in which:
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the inner seal carrier ring wall is bevelled to permit eccentric movement of the drive shaft within the seal carrier ring.
9. The drilling tool of claim 2 in which the inner seal carrier ring wall is bevelled to form an obtuse angle with the top seal carrier ring wall and the bottom seal carrier ring wall, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
the seal carrier ring is defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall; and the inner seal carrier ring wall is bevelled to permit eccentric movement of the drive shaft within the seal carrier ring.
9. The drilling tool of claim 2 in which the inner seal carrier ring wall is bevelled to form an obtuse angle with the top seal carrier ring wall and the bottom seal carrier ring wall, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
10. The drilling tool of claim 6 in which the inner seal carrier ring wall is bevelled to form an obtuse angle with the top seal carrier ring wall and the bottom seal carrier ring wall, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
11. The drilling tool of claim 7 in which the inner seal carrier ring wall is bevelled to form an obtuse angle with the top seal carrier ring wall and the bottom seal carrier ring wall, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
12. The drilling tool of claim 1 in which:
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall; and the housing adapter is formed in a first part threaded to a second part, the first and second parts together forming the encircling wall.
the annular recess is defined by an outer recess wall, a top recess wall and a bottom recess wall; and the housing adapter is formed in a first part threaded to a second part, the first and second parts together forming the encircling wall.
13. The drilling tool of claim 12 in which the top recess wall is formed in the first part of the housing adapter and the bottom recess wall is formed in the second part of the housing adapter.
14. A drilling tool, comprising:
a drive shaft having a coupling end, the coupling end having a cylindrical portion;
an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket;
an annular recess formed in the encircling wall of the adapter housing, the annular recess being defined by an outer recess wall, a top recess wall and a bottom recess wall;
a seal carrier ring seated in the annular recess, the seal carrier ring being defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall, the seal carrier ring being radially movable within the annular recess;
the seal carrier ring being sealed to the encircling wall by a top O-ring seated in a recess in the top seal carrier ring wall and by a bottom O-ring seated in a recess in the bottom seal carrier ring wall, the seal carrier ring thereby forming a sliding seal with the encircling wall; and the seal carrier ring being sealed against the cylindrical portion of the drive shaft by an O-ring seated in a recess in the inner seal carrier ring wall, the seal carrier ring thereby forming a sliding seal permitting axial movement of the seal carrier ring along the drive shaft.
a drive shaft having a coupling end, the coupling end having a cylindrical portion;
an adapter housing having an encircling wall defining a socket, the coupling end of the drive shaft being received by the socket;
an annular recess formed in the encircling wall of the adapter housing, the annular recess being defined by an outer recess wall, a top recess wall and a bottom recess wall;
a seal carrier ring seated in the annular recess, the seal carrier ring being defined by an outer seal carrier ring wall, a top seal carrier ring wall, an inner seal carrier ring wall and a bottom seal carrier ring wall, the seal carrier ring being radially movable within the annular recess;
the seal carrier ring being sealed to the encircling wall by a top O-ring seated in a recess in the top seal carrier ring wall and by a bottom O-ring seated in a recess in the bottom seal carrier ring wall, the seal carrier ring thereby forming a sliding seal with the encircling wall; and the seal carrier ring being sealed against the cylindrical portion of the drive shaft by an O-ring seated in a recess in the inner seal carrier ring wall, the seal carrier ring thereby forming a sliding seal permitting axial movement of the seal carrier ring along the drive shaft.
15. The drilling tool of claim 14 in which the inner seal carrier ring wall is bevelled to form an obtuse angle with the top seal carrier ring wall and the bottom seal carrier ring wall, thereby to permit eccentric movement of the drive shaft within the seal carrier ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2308679 CA2308679A1 (en) | 2000-05-17 | 2000-05-17 | Drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2308679 CA2308679A1 (en) | 2000-05-17 | 2000-05-17 | Drilling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2308679A1 true CA2308679A1 (en) | 2001-11-17 |
Family
ID=4166168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2308679 Abandoned CA2308679A1 (en) | 2000-05-17 | 2000-05-17 | Drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2308679A1 (en) |
-
2000
- 2000-05-17 CA CA 2308679 patent/CA2308679A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |