CA1179673A - Cutting member for rotary drill bits - Google Patents

Cutting member for rotary drill bits

Info

Publication number
CA1179673A
CA1179673A CA000398724A CA398724A CA1179673A CA 1179673 A CA1179673 A CA 1179673A CA 000398724 A CA000398724 A CA 000398724A CA 398724 A CA398724 A CA 398724A CA 1179673 A CA1179673 A CA 1179673A
Authority
CA
Canada
Prior art keywords
cutting
supporting
faces
members
edge
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
Application number
CA000398724A
Other languages
French (fr)
Inventor
Rainer Jurgens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norton Christensen Inc
Original Assignee
Norton Christensen Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Norton Christensen Inc filed Critical Norton Christensen Inc
Application granted granted Critical
Publication of CA1179673A publication Critical patent/CA1179673A/en
Expired legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56Button-type inserts
    • E21B10/567Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/5673Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/58Chisel-type inserts

Abstract

ABSTRACT

A cutting member for rotary drill bits consists of a carrier member with a supporting face which consists of two component supporting faces adjoining one another in wedge-shape forming a front edge, and applied to each of the two component supporting faces is a supporting member together with a cutting layer which occupies the whole area. The cutting member which is wedge-shaped in its contours develops high drilling performances particularly in comparatively soft ground formations and is considerably cheaper than known wedge-shaped cutting members and renders possible an extensive variability in the formation of the supporting members together with the cutting layers and their arrangement on the carrier member.

Description

The inv ntion relates to a cutting member for rotary drill bits for deep-well arilling and to rotary drill bits incorporating such cutting members.
In cutting ~embers of this kind found commercially (US-PS 4,006,788), the supporting member together with its cutting layer eonsists of a circular small plate or a flat cylinder, and the polycrystalline synthetic diamond material forming the cutting layer is applied to the supporting member by a sintering or hot infiltration process and forms a rigid unit Wit}l this.
The expensive diamond material causes by far the greatest proportion of the production costs of such diamond cutting plates. It is true that such cutting members have a number o possibilities of use on rotary drill bits for deep-~ell drilliny, and display satisfactory drilling capacities, but the drill bits equipped with diamond cutting members in this manner are very expensive because of the high price o the diamond material. In particular, however, such cutting members have only lirnited suitability in comparatively soft ground formations.
Furthermore, rotary drill bits for deep-well drilling in rock and the like gro~nd formations have been proposed (DE-OS 2910347), the cutting members of which each consist o a carrier portion or supporting member of h~rd metal or the like and a cutting ~ortion particularly oE
- 2 -~ ~t~ 3 polycrystalline synthetic diamond material disposed on this, and are formed from a sector o~ a sintered body surrounding the cutting porticn in the form o~ a core with its carrier portion at least at the periphery as a sheath. In this case, the cutting members have the shape of wedge-shaped sectors which are preferably cut out of a cylinder or a polygonal straight prism with suitable wedge angles of 45, 60 or 90 for example.
In this proposed construction, in contrast to the cutting members in the orm of small plates with a diamond covering mentioned at the beginning, the cutting portion is not formed from a thin surface layer but from a corner region of au~mented diamond composition. A
preferred field of use for these cutting members is formed by rotary drill bits for deep-well drilling in comparatively soft ground formakions, the cutting members beiny inserted in a base member of the drill bit in such a manner that they engage in the ormation with a leading end cutting edge and detach a chip from the ormation in the manner of a plough.
It is true that particularly satisfactory drilling results can be achieved in soft ground formations with cutting members constructed in this manner, but the production of the cutting members requires a high proportion of the expensive diamond material accumulated in the cor:ner .

. ~.'7~;7~

region in the finished cutting member.
: It is the object of the present invention to provide an improved cutting member or rotary drill bits.
The present invention is a cutting member for rotary drill bits comprising a carrier member having a supporting face consisting of two component supporting faces adjoining one another in a wedge-shape to form a front edge, each of the ~wo component supporting faces mounting a supporting mem~er occupying its full area and having on its front face a cutting layer~
The present invention is also a rotary drill bit incorporating cutting members as defined in the last preceding paragraph.
In a pre~erred embodiment, a supportiny memb~r together with a cutting layer is disposed on each of the component supporting faces of the carrier member mating in wedge--shape, so that a cutting member which i~ wedye-shaped in its contouxs is ~ormed which can develop a plough effect in drilling op~ration when workiny the ground formation and there~ore can achieve high drilliny perormances - particularly in comparatively soft ground formations. At the same time, the cutting member according to the preferred embodiment is considerabl~ cheaper than the known wedge-shaped cutting rnembers because the supporting member and cutting layer used according to the invention can be formed ~ 4 ~L 3L7~673 from the cutting members in the form of small plates or circular cylindrical shaped bodies which have long been known and are found commercially and out of which they are cut preferably in contours corresponding to the component supporting faces of the carrier rnember.
Fundamentally, production of the supporting mem~er together with the cutting layer is also possible as a shaped body corresponding to a predetermined component supporting face o~ the carrier member but the preparation from sectors from a circular cylindrical shaped body according to the component supporting faces of the carrier member ofers the advantage that ordinary commercial diamond cutting plates can be used and rationally employed. In particular, an accumulation of expensive diamond material in the corner region of the cutting members is avoided and a ~ar-reaching variability in the formation of the supportiny members together with the cutting layer and their arrangement on the carrier member is ensured. In this manner, the cutting members according to the invention can be produced with a maximum of economy, to which not least the fact contributes that even unused residues of circular d1amond cutting plates which have already been used can be used economically for the production of cuttiny members according to the invention.
Embodisnents o the prescnt invention will now be 11~96~73 described, by way of example, ~ith reference to the accompanying drawinc~s, in which:-Fig. 1 shows a cross-section through a first embodiment of a cutting member according to the present invention;
Fig. 2 shows a cross-section through a second embodiment of a cutting member according to the present invention;
Fig. 3 shows an enlarged corner region of the cutting member of Fig. 2; ana Figs. 4 to 10 each show further embodiments of cutting members according to the present invention in side vie~

The cutting members illustrated in the figures comprise a carrier member 1 which is formed frorn a hard-metal or the like haxd-material pin and can be inserted by one end in a base member 2, or example a matrix binding-agent composition, o a drill bit. In the embodiments shown in Figs. 1 and 2, tne carrier member 1 has, in its main portion, the cross-sectional shape which -can be seen from these figures and which is composed of a semiciruclar area 3 and a trian~ular area 4. Machined in the lateral faces 5 and 6 boundiny the triangular area 4 of the carrier member 1 is a suppor-ting face 7 which consists of two component supporti.ny faces 8. The two 6 . .

1179i73 component supporting faces 8 meet in a wedge shape, in the example illustrated at an angle of 90, and at their transition ~orm a front edg~ 9 o ~he supporting face 7.
Applied to each of the two component supporting faces 8, at its back, is a supporting member 10 together with a cutting layer 11, which occupies the whole area.
The supporting members 10 consist of a suitable hard metal or sintered metal or the like hard material, for example tungsten carbide, while the cutting layer 11 consists or suitable diamond material, particularly polycrystalline synthetic diamond material and is rigidly connected to the supporting member 10 ~y a hot lnfiltration process by methods known er se. The supporking member 10 together with its cutting layer 11 is cut, or example by spark erosion, out o~ a circular cylindrical shaped body comprising the cutting layer at one surface, which can be ~ormed by production methods known ~ e. In the embodiment shown in Fig. la, the a~;acent edge~ 12 of the supporting member 10 and cutting layer 11 are mitre-cut, mate flush with one another in front of the front edge 9 of the supporting face 7 and together form an end cutting edge 13, while in the modiication shown in Fig. lb the supporting member 10 and cutting layer 11 are cut at right angles forming marginal faces 12' and are secured to the carrier member overlapping in the manner shown.

The embodiment according to Fig. Z differs from that of Fig. la in that the adjacent marginal ~aces 12' of the supporting m~mber 10 together with the cutting layer 11 extend at right angles to their front and their back and a separate insert 14 of hard material is disposed in the gusset remaining between them. The insert 14 of hard material is formed from a shaped body in the form of a sguare rod, the lateral dimensions of which correspond substan~ially to the width o the supporting member 10 together with the cutting layer 11, that is to say their marginal faces 12', and the height of which corresponds substantially to that of the front edge 9 of the supportina face 7. The outer faces 15 of the insert 14 of hard material are in alignment with the cutting layer 11 of the particular adjoining supporting rnember 10, while its ront edge 16 forms an end cutting edge correspondiny t:o the end cutting edge 13 of the embodiment shown in Fig. 1.
The insert 14 of hard material may consist of a hard metal or, as illustrated in the enlarged detail shown in Fig~ 3, of a matrix composition which is impregnated with diamonds or comprises diamonds set in the surface. ~.bove all, diamonds 17, preferably natural ones, are inserted in the region of the end cutting edge 15 of the insert 14.
As can further be seen from r'igs. 1 and 2, the component supporting ~aces 8 of the carrier member 1 are _ ~ _ 9~3 provided with marginal faces 18 which are stepped ~utwards and against which the supporting members 10 together with their cutting layer 11 are supported at the edge side in regions of their marginal faces 12 and 12' remote from one another. Remaining in a lateral extension of the supporting members 10 are regions of the lateral faces 5 and 6 of the carrier member 1 which continue the cutting layer 11 of the supporting members 10 in a direction facing away from the end cutting edge 13 or 16 and are in alignment with these in the embodiment illustrated. These face regions form rakes to remove the formation chips drilled out.
In Figs. 4 to 10, the pin-shaped carrier member 1 is shown in its installed state in a drill bit, in which case it is inserted by one of its ends in the base member 2 of the drill bit and carries the two suppor-ting members 10 together with the cutting layer 11 in its region pro;ecting beyond the base member 2. It can be seen that the supporting members 10 together with the cutting layer 11 each have the shape of a segment or a sector of a circle, the component supporting faces 8 being constructed in the form of a divided circle accordingly. The supporting members 10 border, with a front marginal edge, which can be formed during an operation of cutting the supporting mem~er 10 together with the cutting layer 11 out of a circular cylindrical shaped body, against the ront edge 9 o. the supporting face 7, while the edges 19 remote from one another of the supporting members 10 together with the cutting layer 11 are e.ither engaged over and supported by the marginal faces 18 of the component supporting faces 8 which are bent outwards at an angle or form outer cutting edges 20 supplementing tne end cutting edge 13 or I6 which is disposed in the plane of the front edge 9 of the supporting face 7 of the carrier membex 1.
In the embodiment shown in Fig. 4, the two supporting members 10 together with the cutting layer 11 each have the form of a semicircle in plan view, the straight edge forming the end cutting edge 13 while the arcuate edges 19 are mainly engaged over by the marginal ~aces 18 of khe component supporting faces 8 and only their lower end region forms an additional outer cut~iny edge 20.
Instead of a semicircle, other supporting members 10 together with cutting layers 11 in the forrn of segments of a circle may be used in arrangements corresponding to . Fig. 4.
Apart from ihis, in the embodiment shown in Fig.
. 4, as in the further embodiments shown in Figs~ 5 to 8, the pin-shaped carrier member 1 is provided with an outer, free, backward end region 21 which i5 rounded in arcuate 10 ~

~' .

~7g673 shape towards the front edge 9 of the supporting ~ace 7 or towards the end cutting ed~e 13 or 16.
In the embodiment shown in Fig. 5, the two supporting members 10 together with the cutting layer.s 11 each have the basic shape of a sector of a circle in plan view, one straight edge forming the end cutting edge 13 and the other sector edge kept free of support by the carrier member 1 is in turn rounded in continuation of the arcuately rounded region 21 of the carrier member 1 towards the end cutting ed~e 13. The arcuate edge of the two supporting memDers 10 together with the cutting layers 11 is engaged over and supported by the angled marginal faces 18 o.f.the component supporting faces 8.
The embodiment shown in Fig~ 6 differs from : -that of Fig. 5 essen-tially in that the outer cutting edge 20 of the supporting members 10 toyether with the cutting layers 11, which are also in the orm of a sector of a circle here, extends straight and at right angle.s to the end cutting edge 13.

In the embodiment shown in Fig. 7, in which the two supporting members 10 together with the cutting layers 11, as in the case of the embodiment shown in Fig. 6, are each formed from a sector of a circle in the orm of a quadrant, a modification is made in such a manner that the one str~ight sector edge forms the end cutting ~dge 13 and ~1796~

the arcuate marginal edge forms the additional oute~
cutting edge 20, while the other straight sector edge is engaged over and supported by one of the angled marginal faces 18 of the two component supporting faces 7. The rear, rounded outer region 21 of the carrier member 1 extends congruent with the outer cutting edge 20 of the supporting member 10 together with the cutting layer 11 In the embodiment shown in Fig. 8, the two supporting members 10 together with the cutting layers 11 are provided in t'ne form of acute-angled sect~rs of a circle in an arran~ement corresponding to Fig. 7. While the one straight sector edge again forms the end cutting edge 13 and the arcuate edge forms the additional outer cutting edge 20, the other straight marginal edge, engaged over by one of the anyled marginal fac~s 18 o~ the component supporting faces 8, exkends obliquely to the and cuttiny edge ~3 according to the angle selected. The rear, rounded outer region 21 of the carrier member 1 assumes a course corresponding to the example shown in Fig. 7.
In the embodiments of Figs. 9 and 10, the supporting members 10 together with the cutting layers 11 are not formed by sectors of a circle but only have straight boundary edges. ~n these cases, the supporting members 10 together with the cutting la~ers 11 may likewis~

- 12 _ .

1~796~

be formed by being cuk out of appropriate shaped bodies or may be constructed in the form o~ shaped bodies preshaped in their final form.
In the embodiments shown in Figs. 9 and 10, th~
arrangement and mounting of the supporting members 10 together with tne cutting layers 11 on the carrier member is effected as in the examples described above.
Thus in the embodiment shown in Fig. 9 there is a lower outer cutting edge 20 corresponding to Fig. 6, which extends straight and at right angles to the end cutting edge 13. The straight marginal edge situated opposite to the outer cutting edge 20 and extending parallel to this is engaged over and supported by an angled marginal face 18 o~ the associated component supporting face. Between these two marginal edges, a straight marginal edge of the supporting member 10 together with the cutting layer 11, which edge is kep~ free of support, extends obliquely to the base member 2.
In the embodiment shown in Fig. 10, a lowar outer cutting edge 20 which extends strai~ht and at right angles to the end cutting edge 13 is likewise provided, and the straight marginal edges engaged over by the angled marginal faces 18 of the component supporting ~aces 8 extend at first at right angles to the lower outer cutting edge 20 and then extend obliquely to the outer ~l~gS73 cuttin~ edge 13 and to the base m~mber 2.
Lateral face regi~ns 5 and 6 in an exte~sion of the cutting layers 11 of the two supporting mernbers 1~ are omitted in the embodiments shown in Figs. 7, 8 and 9.
The rigid connection of the two supporting members 10 to the carrier member 1 can be effected by a soldered connection 22, as illustrated diagrammatically in Figs. 1 to 3. In the case of the embodiment shown in Figs. 2 and 3, the connection of the insert 14 of hard material to the two supporting members 10 can also be effected by the soldered connection 22.
~' Instead o a soldered connection, the two supporting members 10 can be conrlected to the carrier member 1 and possibly the insert 14 of hard material may be connected to the two supporting members lO by form sintering or hot isostatic pressing.
The examples illustrated in th,e drawings are only a selection from a large number of possible forms of the cutting members and their mounting on the drill bit, and various setting angles may be selected with regard to the ground formation to be worked, so that the cutting members can act on the formation not only with a ploughing action with a leading end cutting edge 13 or 16, but also with a scratching or scrapin~ action.

Claims (9)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A cutting member for rotary drill bits comprising a carrier member having a supporting face consisting of two component supporting faces adjoining one another in a wedge-shape to form a front edge, each of the two component supporting faces mounting a supporting member occupying its full area and having on its front face a cutting layer;
said supporting memberstogether with their cutting layers being cut out of a circular cylindrical shaped body which has the cutting layer on one surface thereof, and;
in which the component supporting faces are constructed in the form of a divided circle and the supporting members have the shape of a corresponding segment or sector of a circle and adjoin the front edge of the supporting face with a marginal edge in each case;
and wherein the adjacent edges of the supporting members have marginal faces extending at right angles to their front and their back and a separate insert of hard material is disposed in the gusset remaining between them.
2. A cutting member as claimed in claim 1, in which the insert of hard material is formed from a shaped body in the form of a square bar the lateral dimensions of which correspond to the width of the supporting members together with the cutting layer and the height of which corresponds to that of the front edge of the supporting face.
3. A cutting member as claimed in claim 2, in which the insert of hard material consists of a hard metal.
4. A cutting member as claimed in claim 2, in which the insert of hard material consists of a matrix composition which is impregnated with diamonds or comprises diamonds set in the surface.
5. A cutting member as claimed in claim 4, in which the carrier member is formed from a pin of hard material which can be inserted by one end in a base member of a drill bit and which carries the two supporting members together with the cutting layer in its region projecting beyond the base member.
6. A cutting member as claimed in claim 5, in which the component supporting faces of the carrier member are provided with marginal faces stepped outwards at an angle against which the supporting members together with their cutting layer are supported at the edge side in the regions of their edges remote from one another.
7. A cutting member as claimed in claim 1, in which the two supporting members are rigidly connected to the carrier member by a soldered connection, by form sintering or by isostatic pressing.
8. A cutting member as claimed in claim 7, in which the insert of hard-material is connected to the two supporting members by a soldered connection, by form sintering or by hot isostatic pressing.
9. A rotary drill bit incorporating cutting members as claimed in claim 1.
CA000398724A 1981-04-11 1982-03-18 Cutting member for rotary drill bits Expired CA1179673A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3114749A DE3114749C2 (en) 1981-04-11 1981-04-11 Wedge-shaped cutting link for rotary drill bits for deep drilling
DEP3114749.6 1981-04-11

Publications (1)

Publication Number Publication Date
CA1179673A true CA1179673A (en) 1984-12-18

Family

ID=6129969

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000398724A Expired CA1179673A (en) 1981-04-11 1982-03-18 Cutting member for rotary drill bits

Country Status (7)

Country Link
US (1) US4440246A (en)
BE (1) BE892487A (en)
CA (1) CA1179673A (en)
DE (1) DE3114749C2 (en)
FR (1) FR2503785B1 (en)
GB (1) GB2096669B (en)
NL (1) NL8201210A (en)

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US4724913A (en) * 1983-02-18 1988-02-16 Strata Bit Corporation Drill bit and improved cutting element
AU2568884A (en) * 1983-03-21 1984-09-27 Norton Christensen Inc. Teeth for drill bit
GB2138864B (en) * 1983-04-28 1986-07-30 Sumitomo Metal Mining Co Roller drill bits
GB2148353B (en) * 1983-09-15 1986-03-05 Boart Int Ltd Mining picks
DE3433277A1 (en) * 1984-09-11 1986-03-20 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen GROUND CHISEL FOR CARBON
GB2181472A (en) * 1985-08-22 1987-04-23 Anderson Strathclyde Plc Cutter tools and tip inserts therefor
US4978260A (en) * 1986-01-06 1990-12-18 Tri-State Oil Tools, Inc. Cutting tool for removing materials from well bore
US5373900A (en) 1988-04-15 1994-12-20 Baker Hughes Incorporated Downhole milling tool
US4907662A (en) * 1986-02-18 1990-03-13 Reed Tool Company Rotary drill bit having improved mounting means for multiple cutting elements
US4682663A (en) * 1986-02-18 1987-07-28 Reed Tool Company Mounting means for cutting elements in drag type rotary drill bit
US4830123A (en) * 1986-02-18 1989-05-16 Reed Tool Company Mounting means for cutting elements in drag type rotary drill bit
US4819516A (en) * 1988-01-07 1989-04-11 Diamant Boart-Stratabit (Usa) Inc. Method of forming a cutting element having a V-shaped diamond cutting face
GB8907618D0 (en) * 1989-04-05 1989-05-17 Morrison Pumps Sa Drilling
US5238074A (en) * 1992-01-06 1993-08-24 Baker Hughes Incorporated Mosaic diamond drag bit cutter having a nonuniform wear pattern
US5984005A (en) 1995-09-22 1999-11-16 Weatherford/Lamb, Inc. Wellbore milling inserts and mills
US6170576B1 (en) 1995-09-22 2001-01-09 Weatherford/Lamb, Inc. Mills for wellbore operations
GB9803096D0 (en) * 1998-02-14 1998-04-08 Camco Int Uk Ltd Improvements in preform elements and mountings therefor
EP1182323B1 (en) * 2000-08-21 2003-09-10 Camco International (UK) Limited Multi-directional cutters for bi-center drillout bits
GB2404889A (en) * 2003-08-12 2005-02-16 Black & Decker Inc A cutting plate for a drill bit
CA2535387C (en) 2005-02-08 2013-05-07 Smith International, Inc. Thermally stable polycrystalline diamond cutting elements and bits incorporating the same
US8083012B2 (en) 2008-10-03 2011-12-27 Smith International, Inc. Diamond bonded construction with thermally stable region
WO2010117765A1 (en) * 2009-03-30 2010-10-14 Schlumberger Canada Limited Double sintered thermally stable polycrystalline diamond cutting elements
MX2012012764A (en) 2010-05-03 2013-04-19 Baker Hughes Inc Cutting elements, earth-boring tools, and methods of forming such cutting elements and tools.
US10329847B2 (en) * 2015-06-29 2019-06-25 Ulterra Drilling Technologies, L.P. Cutting elements for downhole cutting tools
CN108368727B (en) * 2015-12-14 2021-03-12 史密斯国际有限公司 Cutting element formed from a combination of materials and drill bit including the same
US11492852B2 (en) 2015-12-14 2022-11-08 Schlumberger Technology Corporation Mechanical locking of cutting element with carbide matrix
DE102017011131A1 (en) * 2017-12-01 2019-06-06 Bomag Gmbh Highly wear-resistant, one-piece chisel tip body, milling chisel for a floor milling machine, milling drum and ground milling machine
USD924949S1 (en) 2019-01-11 2021-07-13 Us Synthetic Corporation Cutting tool

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Also Published As

Publication number Publication date
DE3114749C2 (en) 1983-10-27
FR2503785B1 (en) 1986-05-16
GB2096669A (en) 1982-10-20
US4440246A (en) 1984-04-03
NL8201210A (en) 1982-11-01
FR2503785A1 (en) 1982-10-15
DE3114749A1 (en) 1982-10-28
GB2096669B (en) 1985-02-27
BE892487A (en) 1982-07-01

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