CA2253503A1 - Stabiliser for borehole drilling apparatus - Google Patents
Stabiliser for borehole drilling apparatus Download PDFInfo
- Publication number
- CA2253503A1 CA2253503A1 CA 2253503 CA2253503A CA2253503A1 CA 2253503 A1 CA2253503 A1 CA 2253503A1 CA 2253503 CA2253503 CA 2253503 CA 2253503 A CA2253503 A CA 2253503A CA 2253503 A1 CA2253503 A1 CA 2253503A1
- Authority
- CA
- Canada
- Prior art keywords
- stabiliser
- wear
- wear element
- blade
- spiral
- 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
- 239000003381 stabilizer Substances 0.000 title claims abstract description 42
- 238000005553 drilling Methods 0.000 title claims abstract description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 2
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011435 rock Substances 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
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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)
- Earth Drilling (AREA)
Abstract
A drill string stabiliser (10) for bore hole drilling apparatus, which comprises a plurality of fixed spiral blade arms (11) provided with replaceable wear elements (12).
Description
CA 022~3~03 1998-ll-03 STABLISER FOR BOREHOLE DRLLING APPARATUS
This invention relates to stabilisers for borehole drilling apparatus and more particularly to a drill string stabiliser having fixed blade arms provided with replaceable wear elements.
Drill string stabilisers, sometimes referred to as drill collar stabilisers, or as drill stem stabilisers, are used in earth boring operations to centralise the drill stem in a borehole during drilling operations, especially in the drill collar section of the drill string, for example, at distances of from 0-300 metres above the drill bit. The drill string stabiliser has a variety of functions as follows:
(i) to control the hole angle direction;
20(ii) to prevent the bit from drifting laterally;
and (iii) to improve the cutting performance of the bit by keeping it rotating centrally about its 25axis so as to provide a substantially equal force loading on all three drill bit cones.
CA 022~3~03 1998-11-03 In addition, where the surrounding rock formation is not too hard, the stabiliser may also provide a re~ming function for undersized or irregularly shaped boreholes.
This invention is particularly concerned with rotatable stabilisers of the kind which rotate together with the drill string.
The wall-contacting members of a rotatable stabiliser are subject to the various forces attendant on the entire drill string, which may include thrust forces, fretting forces, and the forces resulting from drill string manipulations, the conditions of the borehole, and the fluid conditions internal and external to the drill string.
In the rotary system of drilling, employing a liquid circulating through the drill string and through the annulus between the drill string and the borehole, it is necessary that the stabiliser includes not only fluid passage means therethrough to form part of the drill string flow passage, but also fluid passage means to form part of the annulus fluid passage. The annular fluid passage means are provided at the outer periphery of the stabiliser, with the result that the wall-contacting portion of the stabiliser is not continuous around the circumference thereof, but instead consists of a number CA 022~3~03 1998-11-03 of blades azimuthally spaced apart by the fluid passage means.
It is known to provide fixed blade arms, incorporating wear elements, which are welded to the stabiliser, or to a sleeve surrounding the stabiliser, and such "welded-blade" stabilisers are disclosed in GB
2096210, US 2288124, and US 3268274.
10It is also known to provide rotatable stabilisers with devices for connecting wear elements to fixed blade arms, enabling the wear elements to be detached and replaced. Such mechanisms include various slot and groove connections, cap screw connections, tapering wedging connections and combinations of these. Typical arrangements are shown in US 3680647 and US 3818999. US
4662461 discloses a stabiliser having a plurality of fixed blade arms with replaceable wear elements.
20Whilst all the above patents are concerned with stabilisers in which the blades lie parallel to the axis of the drill string, there is another class of stabilisers, known as spiral blade stabilisers, for which no solution to the problem of providing replaceable wear elements has yet been found.
According to the present invention, there is provided a drill string stabiliser for borehole drilling ~MENDED SHEET
IPEA/EP --, . .. .. . . , _ . .
CA 022~3~03 1998-11-03 apparatus, which comprises a plurality of fixed blade arms provided with replaceable wear elements, characterised in that the blade arms are spiral and provided with shoulders defining longitudinal grooves or recesses in the external faces of the blade arms; in that replaceable wear elements are provided with seating portions which are located in the longitudinal grooves or recesses; and in that the shoulders and the seating portions of the wear elements are provided with holes which, when a wear element is located in its groove or recess, are aligned, such that a connecting means can be inserted into the holes to secure the wear element to the blade arm.
The stabiliser may be provided with any suitable number of spiral blade arms, but usually two or three are sufficient for most purposes. A larger number of blade arms can, however, be used if appropriate.
The wear elements can comprise silicon carbide, or similar hard materials. Preferably, each spiral blade arm is provided with a single wear element, curved to form a segment of a spiral or helix, which extends for the full length of the working surface of the blade arm.
The wear element preferably has a surface which is proud of the blade arm, and can, for example, extend to a radial distance of from 10 to 500 mm from the blade arm.
:pr~ E~
_ . ~ . . . .
. .
CA 022~3~03 1998-11-03 Examples of spiral blade stabilisers provided with replaceable wear elements in accordance with the invention will now be described with reference to the accompanying Drawings in which:
Figure 1 shows a side elevation of a prior art spiral blade stabiliser;
Figure 2 shows a side elevation of a first embodiment of a spiral blade stabiliser according to the invention;
Figure 3 shows a perspective view from the side and one end of a wear element suitable for use in a stabiliser of the present invention;
Figure 4 shows a sectional end elevation of a spiral blade stabiliser according to the invention, illustrating three different types of seating for the wear element;
and ~t\/lENDED SH~ET
IPEa/EP -CA 022~3~03 1998-ll-03 Figures 5(a) to (e) illustrate various securing devices by which the wear element can be secured to the spiral blade arm.
Referring firstly to Figure l, there is illustrated a prior art spiral blade stabiliser 1 having a body 2 provided with spiral blade arms 3 having wear surfaces 4.
Spiral channels 5 are provided between adjacent blade arms to permit drilling fluid, carrying debris from the borehole, to pass therealong.
Figure 2 illustrates a first embodiment of a spiral blade stabiliser according to the invention, in which the stabiliser lO has blade arms 11 having wear elements 12 seated in grooves 13 in the blade working surfaces 14.
Figure 3 shows a novel wear element for use in a stabiliser according to the invention. The wear element 20, which is curved in two directions in order to conform to the external surface of a spiral blade, has a working surface 21, and a wedge-shaped seating portion 22.
The location of the wear element 20 on a spiral blade arm is shown in figure 4, top right hand side. The spiral blade arm 30 is provided with shoulders 31 defining a wedge-shaped groove 32 in the external surface of the blade arm 30. The wear element 20 is seated on the blade arm 30 such that the wedge-shaped seating CA 022~3~03 1998-11-03 portion 22 of the wear element fits tightly into the groove 32. Although the seating faces 33, 34 are shown as straight, they need not be straight, or symmetrical, and any suitable curved shape can be used as appropriate.
The wear element 20 is seated proud of the blade arm 30 as shown.
Figure 4 also illustrates an alternative seating arrangement. At the bottom right hand side there is shown blade arm 40 having shoulders 41 defining a wedge-shaped groove 42 with rounded bottom corners 43. The wear element 44 is seated with its wedge-shaped seating portion 45 in the ~loo~e 42, and is held tightly by the sides thereof such that it extends proud of the blade 40.
Again, the sides do not have to be straight or symmetrical.
Figure S shows various alternative arrangements for mounting and securing the wear elements to the blade arms of a stabiliser. In figure 5(a), the stabiliser blade arm 50 has shoulders 51 having aligned, transversely directed holes 52 therein. The flanged wear element 53 has a seating portion 54 in which there is a transverse hole 55 which is aligned with the holes 52 to provide a through passage. A tapered pin 56, which is a tight fit in the passage formed by the holes 52 and 54, is inserted therein to secure the wear element 53 in place.
CA 022~3~03 1998-11-03 Figure 5(b) shows a second arrangement in which the blade arm 60 is provided with shoulders 61 having a passage 62 drilled transversely therethrough. The wear element 63 has a corresponding recess 64 drilled therein so as not to provide an obstruction to the passage 62 when the wear element is seated on the blade arm 60. A
barrel nut 65 is positioned in the passage 62 and aligned such that its central threaded hole 66 is immediately beneath a bolt hole 67 in the wear element 63. The bolthole 67 is countersunk to accept a bolt 68 such that the head of the bolt 69 is below the working surface of the wear element 63.
In Figure 5(c) there is shown a further mounting lS arrangement which is similar to that of Figure 5(a) except that the tapered pin 56 is replaced by a roll pin 70 and the shoulders 71 of the blade arm 72 have straight sides and curved corners to accommodate a similarly shaped seating portion 73 of wear element 74.
Figure 5(d) shows a similar arrangement to that of Figure 5(c) except that in this case the groove 80 in the blade arm 81 is wedge-shaped to accommodate a wedge-shaped seating portion 82 of the wear element.
Finally, Figure 5(e) shows a still further arrangement which is similar to that of Figure 5(c) except that the roll pin is replaced by a bent or cranked CA 022~3~03 1998-11-03 pin 90 fixed at one end to a locking plate 91 carrying a locking screw 92. Locking plate 91 and screw 92 fit within a recess 93 of the blade arm 94 and the locking screw is secured to the blade arm 94 via a screw threaded hole 95. The bent or cranked pin provides a radial force to maintain the flanged wear element 96 firmly secured to the blade arm 94 and its orientation is maintained by the locking plate and screw arrangement 91, 92.
Al~ r'~E~! SHEE~
~ ?~ ~ 'E~
. ,,, , , . . ~ , CA 022~3~03 1998-ll-03 stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). This invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any A~.r.Dmpanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
. . .
This invention relates to stabilisers for borehole drilling apparatus and more particularly to a drill string stabiliser having fixed blade arms provided with replaceable wear elements.
Drill string stabilisers, sometimes referred to as drill collar stabilisers, or as drill stem stabilisers, are used in earth boring operations to centralise the drill stem in a borehole during drilling operations, especially in the drill collar section of the drill string, for example, at distances of from 0-300 metres above the drill bit. The drill string stabiliser has a variety of functions as follows:
(i) to control the hole angle direction;
20(ii) to prevent the bit from drifting laterally;
and (iii) to improve the cutting performance of the bit by keeping it rotating centrally about its 25axis so as to provide a substantially equal force loading on all three drill bit cones.
CA 022~3~03 1998-11-03 In addition, where the surrounding rock formation is not too hard, the stabiliser may also provide a re~ming function for undersized or irregularly shaped boreholes.
This invention is particularly concerned with rotatable stabilisers of the kind which rotate together with the drill string.
The wall-contacting members of a rotatable stabiliser are subject to the various forces attendant on the entire drill string, which may include thrust forces, fretting forces, and the forces resulting from drill string manipulations, the conditions of the borehole, and the fluid conditions internal and external to the drill string.
In the rotary system of drilling, employing a liquid circulating through the drill string and through the annulus between the drill string and the borehole, it is necessary that the stabiliser includes not only fluid passage means therethrough to form part of the drill string flow passage, but also fluid passage means to form part of the annulus fluid passage. The annular fluid passage means are provided at the outer periphery of the stabiliser, with the result that the wall-contacting portion of the stabiliser is not continuous around the circumference thereof, but instead consists of a number CA 022~3~03 1998-11-03 of blades azimuthally spaced apart by the fluid passage means.
It is known to provide fixed blade arms, incorporating wear elements, which are welded to the stabiliser, or to a sleeve surrounding the stabiliser, and such "welded-blade" stabilisers are disclosed in GB
2096210, US 2288124, and US 3268274.
10It is also known to provide rotatable stabilisers with devices for connecting wear elements to fixed blade arms, enabling the wear elements to be detached and replaced. Such mechanisms include various slot and groove connections, cap screw connections, tapering wedging connections and combinations of these. Typical arrangements are shown in US 3680647 and US 3818999. US
4662461 discloses a stabiliser having a plurality of fixed blade arms with replaceable wear elements.
20Whilst all the above patents are concerned with stabilisers in which the blades lie parallel to the axis of the drill string, there is another class of stabilisers, known as spiral blade stabilisers, for which no solution to the problem of providing replaceable wear elements has yet been found.
According to the present invention, there is provided a drill string stabiliser for borehole drilling ~MENDED SHEET
IPEA/EP --, . .. .. . . , _ . .
CA 022~3~03 1998-11-03 apparatus, which comprises a plurality of fixed blade arms provided with replaceable wear elements, characterised in that the blade arms are spiral and provided with shoulders defining longitudinal grooves or recesses in the external faces of the blade arms; in that replaceable wear elements are provided with seating portions which are located in the longitudinal grooves or recesses; and in that the shoulders and the seating portions of the wear elements are provided with holes which, when a wear element is located in its groove or recess, are aligned, such that a connecting means can be inserted into the holes to secure the wear element to the blade arm.
The stabiliser may be provided with any suitable number of spiral blade arms, but usually two or three are sufficient for most purposes. A larger number of blade arms can, however, be used if appropriate.
The wear elements can comprise silicon carbide, or similar hard materials. Preferably, each spiral blade arm is provided with a single wear element, curved to form a segment of a spiral or helix, which extends for the full length of the working surface of the blade arm.
The wear element preferably has a surface which is proud of the blade arm, and can, for example, extend to a radial distance of from 10 to 500 mm from the blade arm.
:pr~ E~
_ . ~ . . . .
. .
CA 022~3~03 1998-11-03 Examples of spiral blade stabilisers provided with replaceable wear elements in accordance with the invention will now be described with reference to the accompanying Drawings in which:
Figure 1 shows a side elevation of a prior art spiral blade stabiliser;
Figure 2 shows a side elevation of a first embodiment of a spiral blade stabiliser according to the invention;
Figure 3 shows a perspective view from the side and one end of a wear element suitable for use in a stabiliser of the present invention;
Figure 4 shows a sectional end elevation of a spiral blade stabiliser according to the invention, illustrating three different types of seating for the wear element;
and ~t\/lENDED SH~ET
IPEa/EP -CA 022~3~03 1998-ll-03 Figures 5(a) to (e) illustrate various securing devices by which the wear element can be secured to the spiral blade arm.
Referring firstly to Figure l, there is illustrated a prior art spiral blade stabiliser 1 having a body 2 provided with spiral blade arms 3 having wear surfaces 4.
Spiral channels 5 are provided between adjacent blade arms to permit drilling fluid, carrying debris from the borehole, to pass therealong.
Figure 2 illustrates a first embodiment of a spiral blade stabiliser according to the invention, in which the stabiliser lO has blade arms 11 having wear elements 12 seated in grooves 13 in the blade working surfaces 14.
Figure 3 shows a novel wear element for use in a stabiliser according to the invention. The wear element 20, which is curved in two directions in order to conform to the external surface of a spiral blade, has a working surface 21, and a wedge-shaped seating portion 22.
The location of the wear element 20 on a spiral blade arm is shown in figure 4, top right hand side. The spiral blade arm 30 is provided with shoulders 31 defining a wedge-shaped groove 32 in the external surface of the blade arm 30. The wear element 20 is seated on the blade arm 30 such that the wedge-shaped seating CA 022~3~03 1998-11-03 portion 22 of the wear element fits tightly into the groove 32. Although the seating faces 33, 34 are shown as straight, they need not be straight, or symmetrical, and any suitable curved shape can be used as appropriate.
The wear element 20 is seated proud of the blade arm 30 as shown.
Figure 4 also illustrates an alternative seating arrangement. At the bottom right hand side there is shown blade arm 40 having shoulders 41 defining a wedge-shaped groove 42 with rounded bottom corners 43. The wear element 44 is seated with its wedge-shaped seating portion 45 in the ~loo~e 42, and is held tightly by the sides thereof such that it extends proud of the blade 40.
Again, the sides do not have to be straight or symmetrical.
Figure S shows various alternative arrangements for mounting and securing the wear elements to the blade arms of a stabiliser. In figure 5(a), the stabiliser blade arm 50 has shoulders 51 having aligned, transversely directed holes 52 therein. The flanged wear element 53 has a seating portion 54 in which there is a transverse hole 55 which is aligned with the holes 52 to provide a through passage. A tapered pin 56, which is a tight fit in the passage formed by the holes 52 and 54, is inserted therein to secure the wear element 53 in place.
CA 022~3~03 1998-11-03 Figure 5(b) shows a second arrangement in which the blade arm 60 is provided with shoulders 61 having a passage 62 drilled transversely therethrough. The wear element 63 has a corresponding recess 64 drilled therein so as not to provide an obstruction to the passage 62 when the wear element is seated on the blade arm 60. A
barrel nut 65 is positioned in the passage 62 and aligned such that its central threaded hole 66 is immediately beneath a bolt hole 67 in the wear element 63. The bolthole 67 is countersunk to accept a bolt 68 such that the head of the bolt 69 is below the working surface of the wear element 63.
In Figure 5(c) there is shown a further mounting lS arrangement which is similar to that of Figure 5(a) except that the tapered pin 56 is replaced by a roll pin 70 and the shoulders 71 of the blade arm 72 have straight sides and curved corners to accommodate a similarly shaped seating portion 73 of wear element 74.
Figure 5(d) shows a similar arrangement to that of Figure 5(c) except that in this case the groove 80 in the blade arm 81 is wedge-shaped to accommodate a wedge-shaped seating portion 82 of the wear element.
Finally, Figure 5(e) shows a still further arrangement which is similar to that of Figure 5(c) except that the roll pin is replaced by a bent or cranked CA 022~3~03 1998-11-03 pin 90 fixed at one end to a locking plate 91 carrying a locking screw 92. Locking plate 91 and screw 92 fit within a recess 93 of the blade arm 94 and the locking screw is secured to the blade arm 94 via a screw threaded hole 95. The bent or cranked pin provides a radial force to maintain the flanged wear element 96 firmly secured to the blade arm 94 and its orientation is maintained by the locking plate and screw arrangement 91, 92.
Al~ r'~E~! SHEE~
~ ?~ ~ 'E~
. ,,, , , . . ~ , CA 022~3~03 1998-ll-03 stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). This invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any A~.r.Dmpanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
. . .
Claims (7)
1. A drill string stabiliser (1) for bore hole drilling apparatus, which comprises a plurality of fixed blade arms (11,30,40,50,60,72,81,94) provided with replaceable wear elements (12,20,44,53,63,74,96), characterised in that the blade arms are spiral and provided with shoulders (31,41,51,61,71) defining longitudinal grooves or recesses (32,42,80) in the external faces of the blade arms; in that replaceable wear elements are provided with seating portions (22,45,54,73,82) which are located in the longitudinal grooves or recesses; and in that the shoulders and the seating portions of the wear elements are provided with holes (52/55,62/64) which, when a wear element is located in its groove or recess, are aligned, such that a connecting means (56,65,70,90) can be inserted into the holes to secure the wear element to the blade arm.
2. A stabiliser according to Claim 1, in which the wear elements comprise silicon carbide.
3. A stabiliser according to claim 1 or 2, in which each spiral blade arm is provided with a single wear element which extends for the full length of the working surface of the blade arm.
4. A stabiliser according to claim 1, 2 or 3, in which the wear elements extend to a radial distance of from 10 to 500mm from the blade arm.
5. A stabiliser according to any preceding claim, in which the connecting means is an elongate pin.
6. A stabiliser according to any of claims 1 to 4, in which said hole in the wear element comprises a recess (64) and said connecting means comprises a nut (65) located in the holes (62) in the shoulders (61) and in said recess, and a bolt (68) received in a bolthole (67) in the wear element.
7. A wear element for a spiral blade stabiliser as claimed in any preceding claim which wear element comprises a working face, and a seating portion on a side opposite thereto, the wear element being of generally elongate shape and curved transversely to its longitudinal axis to form a segment of a spiral or helix, said seating portions being provided with holes (62/64).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9611016.8 | 1996-05-25 | ||
| GBGB9611016.8A GB9611016D0 (en) | 1996-05-25 | 1996-05-25 | Improvements in or relating to stabilisers for borehole drilling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2253503A1 true CA2253503A1 (en) | 1997-12-04 |
Family
ID=10794333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2253503 Abandoned CA2253503A1 (en) | 1996-05-25 | 1997-05-23 | Stabiliser for borehole drilling apparatus |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0900318A1 (en) |
| AU (1) | AU719474B2 (en) |
| CA (1) | CA2253503A1 (en) |
| GB (1) | GB9611016D0 (en) |
| WO (1) | WO1997045620A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU774745B2 (en) * | 1999-03-26 | 2004-07-08 | Gearhart Australia Limited | Stabiliser tool block wear pad assembly |
| AUPP946299A0 (en) * | 1999-03-26 | 1999-04-22 | Gearhart Australia Limited | Stabilizer tool block wear pad assembly |
| GB0001435D0 (en) * | 2000-01-22 | 2000-03-08 | Downhole Products Plc | Centraliser |
| DE10136094A1 (en) * | 2001-07-26 | 2003-02-20 | Tracto Technik | drilling |
| US8826986B2 (en) * | 2007-10-03 | 2014-09-09 | M-I L.L.C. | Downhole scraper |
| CN110280811B (en) * | 2019-07-01 | 2020-09-11 | 河北锐石钻头制造有限公司 | Method for manufacturing integral full-consumption self-compensation type combined drilling tool |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1293905A (en) * | 1968-11-06 | 1972-10-25 | Lion Oil Tool Holdings Interna | Oil drilling tools |
| US3754609A (en) * | 1970-09-30 | 1973-08-28 | Smith International | Drill string torque transmission sleeve |
| US3680646A (en) * | 1970-10-28 | 1972-08-01 | Smith International | Reamer-stabilizer |
| US4156374A (en) * | 1978-03-20 | 1979-05-29 | Shwayder Warren M | Pre-formed wear pads for drill stabilizers |
| US4323131A (en) * | 1980-09-08 | 1982-04-06 | Baker Service Company, Inc. | Removable anti-wear insert |
| US4662461A (en) * | 1980-09-15 | 1987-05-05 | Garrett William R | Fixed-contact stabilizer |
| US4396234A (en) * | 1981-04-06 | 1983-08-02 | Garrett William R | Weldable blade stabilizer |
-
1996
- 1996-05-25 GB GBGB9611016.8A patent/GB9611016D0/en active Pending
-
1997
- 1997-05-23 CA CA 2253503 patent/CA2253503A1/en not_active Abandoned
- 1997-05-23 WO PCT/GB1997/001417 patent/WO1997045620A1/en not_active Application Discontinuation
- 1997-05-23 AU AU29105/97A patent/AU719474B2/en not_active Ceased
- 1997-05-23 EP EP97923247A patent/EP0900318A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB9611016D0 (en) | 1996-07-31 |
| WO1997045620A1 (en) | 1997-12-04 |
| AU719474B2 (en) | 2000-05-11 |
| EP0900318A1 (en) | 1999-03-10 |
| AU2910597A (en) | 1998-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |