EP0900318A1 - Stabiliser for borehole drilling apparatus - Google Patents
Stabiliser for borehole drilling apparatusInfo
- Publication number
- EP0900318A1 EP0900318A1 EP97923247A EP97923247A EP0900318A1 EP 0900318 A1 EP0900318 A1 EP 0900318A1 EP 97923247 A EP97923247 A EP 97923247A EP 97923247 A EP97923247 A EP 97923247A EP 0900318 A1 EP0900318 A1 EP 0900318A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stabiliser
- wear
- blade
- wear element
- 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.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Definitions
- 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:
- the stabiliser may also provide a reaming 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.
- the stabiliser 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 of blades azimuthally spaced apart by the fluid passage means.
- a drill string stabiliser for borehole drilling apparatus which comprises a plurality of fixed spiral blade arms provided with replaceable wear elements.
- 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 replaceable wear elements are preferably provided with seating portions on the side opposite to the working or wear face, which seating portions are located in longitudinal grooves or recesses in the external faces of the blade arms.
- the wear elements can comprise silicon carbide, or similar hard materials.
- 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.
- the wear elements may be retained in the grooves of the external faces of the blade arms by any suitable means, but preferably the shoulders of the blade arms and the seating portions of the wear elements are provided with holes which, when the wear element is located in its groove, are aligned, such that a connecting means such as an elongate pin or similar device can be inserted into the holes to secure the wear element to the blade arm.
- 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 Figures 5(a) to (e) illustrate various securing devices by which the wear element can be secured to the spiral blade arm.
- FIG. 1 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.
- FIG. 2 illustrates a first embodiment of a spiral blade stabiliser according to the invention, in which the stabiliser 10 has blade arms 11 having wear elements 12 seated in grooves 13 in the blade working surfaces 14.
- FIG. 3 shows a novel wear element for use in a stabiliser according to the invention.
- 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 portion 22 of the wear element fits tightly into the groove 32.
- 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.
- 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 groove 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.
- FIG 5 shows various alternative arrangements for mounting and securing the wear elements to the blade arms of a stabiliser.
- 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.
- 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.
- FIG. 5(c) there is shown a further mounting 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.
- 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 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.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9611016 | 1996-05-25 | ||
GBGB9611016.8A GB9611016D0 (en) | 1996-05-25 | 1996-05-25 | Improvements in or relating to stabilisers for borehole drilling apparatus |
PCT/GB1997/001417 WO1997045620A1 (en) | 1996-05-25 | 1997-05-23 | Stabiliser for borehole drilling apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0900318A1 true EP0900318A1 (en) | 1999-03-10 |
Family
ID=10794333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97923247A Withdrawn EP0900318A1 (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 |
CA2841589C (en) * | 2007-10-03 | 2017-02-07 | M-I Llc | 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 EP EP97923247A patent/EP0900318A1/en not_active Withdrawn
- 1997-05-23 WO PCT/GB1997/001417 patent/WO1997045620A1/en not_active Application Discontinuation
- 1997-05-23 CA CA 2253503 patent/CA2253503A1/en not_active Abandoned
- 1997-05-23 AU AU29105/97A patent/AU719474B2/en not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO9745620A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2910597A (en) | 1998-01-05 |
AU719474B2 (en) | 2000-05-11 |
WO1997045620A1 (en) | 1997-12-04 |
CA2253503A1 (en) | 1997-12-04 |
GB9611016D0 (en) | 1996-07-31 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6394200B1 (en) | Drillout bi-center bit | |
US8061453B2 (en) | Drill bit with asymmetric gage pad configuration | |
AU726959B2 (en) | Cantilevered hole opener | |
US4953641A (en) | Two cone bit with non-opposite cones | |
US8689908B2 (en) | Drill bit having enhanced stabilization features and method of use thereof | |
CA1214159A (en) | Drill bit and improved cutting element | |
US8177000B2 (en) | Modular system for a back reamer and method | |
US20030221873A1 (en) | Fixed blade fixed cutter hole opener | |
EP0452058B1 (en) | Insert attack angle for roller cone rock bits | |
US6561291B2 (en) | Roller cone drill bit structure having improved journal angle and journal offset | |
EP0058061A2 (en) | Tools for underground formations | |
AU719474B2 (en) | Stabiliser for borehole drilling apparatus | |
US10508500B2 (en) | Earth boring tools having fixed blades and rotatable cutting structures and related methods | |
CA3012013A1 (en) | Bidirectional eccentric stabilizer | |
EP3775465B1 (en) | Earth boring tools having fixed blades and varying sized rotatable cutting structures and related methods | |
US10704336B2 (en) | Earth boring tools having fixed blades, rotatable cutting structures, and stabilizing structures and related methods | |
CN112204221B (en) | Earth-boring tools with fixed blades and rotatable cutting structures and related methods | |
EP1270868B1 (en) | A bi-centre bit for drilling out through a casing shoe |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19981218 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT NL |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 19990504 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19991228 |