EP0339776A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved cutting tool and method for removing materials from well bore
Assignee: Tri State Oil Tools Inc
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Filing: 1989-03-10
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Granted: —
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Expires: 2009-03-10
Abstract
Abstract A cutting tool (10) for removing members downhole from a well bore and adapted to be inserted within a well from the upper end (12) of the casing (14). The cutting tool (10) includes a plurality of elongate blades (32) on the cylindrical body (18) of the cutting tool (10). Cutting elements (42) of a predetermined size and shape are arranged in a symmetrical predetermined pattern on each blade (32) in side-by-side relation in a plurality of predetermined transversely extending rows and a plurality of predetermined generally vertically extending columns. The cutting elements (42) in adjacent transverse rows for each blade (32) are staggered and have different concentric cutting paths. The cutting elements (42E) in corresponding transverse rows on adjacent blades (32A, 32B) are staggered and have different concentric cutting paths. The blades (32A, 32B) of the embodiment of Figures 7-13 have a separate recess (50) on the leading face (34A) for each individual cutting element (42E) for precisely positioning the cutting element (42E). Each cutting element (42E) has a groove (42K) for receiving and directing forwardly the extending end of a metal shaving (S) to facilitate breaking thereof from the casing (14).
Inventors
- 👤 Gerald D. Lynde
- 👤 Harold H. Harvey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 20:53
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/002; B; B23; B23B; B23B5/00; B23B5/16; B23B5/167; B23B5/168; B23P; B23P15/00; B23P15/28; E21B10/00; E21B10/46; E21B29/005; Y; Y10; Y10T; Y10T407/00; Y10T407/11; Y10T407/24; Y10T407/245; Y10T408/00; Y10T408/78
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
207 words
In a cutting tool adapted to be positioned downhole in a well bore for removing members from the well bore; a tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades at spaced intervals on the body and extending outwardly therefrom, each of the blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured to said leading surface of the base each being of a predetermined size and shape and arranged in a predetermined generally symmetrical pattern on the base relative to the other elements, each of said cutting elements having an exposed front cutting face forming a cutting surface, a rear face secured to the leading surface of said base, a peripheral surface extending between said faces, and a relatively sharp edge formed at the juncture of the front face and peripheral surface; said cutting elements being arranged in transversely extending rows on each blade, the cutting elements on corresponding transversely extending rows on adjacent blades being offset whereby the concentric cutting paths of the cutting elements on adjacent blades are offset.
Claim 2
Dependent Claim
207 words
In a cutting tool adapted to be positioned downhole in a well bore for removing members from the well bore; a tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades at spaced intervals on the body and extending outwardly therefrom, each of the blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured to said leading surface of the base each being of a predetermined size and shape and arranged in a predetermined generally symmetrical pattern on the base relative to the other elements, each of said cutting elements having an exposed front cutting face forming a cutting surface, a rear face secured to the leading surface of said base, a peripheral surface extending between said faces, and a relatively sharp edge formed at the juncture of the front face and peripheral surface; said cutting elements being arranged in transversely extending rows on each blade, the cutting elements on corresponding transversely extending rows on adjacent blades being offset whereby the concentric cutting paths of the cutting elements on adjacent blades are offset.
Claim 3
Dependent Claim
38 words
In a cutting tool as set forth in claim 1; the front face of each cutting element having a surface irregularity therein for directing a turning from the member being cut to effect a breaking of the turning.
Claim 4
Dependent Claim
34 words
In a cutting tool as set forth in claim 1; said leading surface of said base having positioning marks thereon for said cutting elements for precisely positioning the cutting elements in said predetermined pattern.
Claim 5
Dependent Claim
56 words
In a cutting tool as set forth in claim 1; said deformation in the front face of each cutting element comprises an annular groove tapering radially inwardly from the peripheral surface and terminating inwardly at an arcuate radius to receive an end of a turning and direct it forwardly with respect to the direction of rotation.
Claim 6
Dependent Claim
29 words
In a cutting tool as set forth in claim 1; said blades being straight blades secured within slots extending in parallel relation to the longitudinal axis of said body.
Claim 7
Dependent Claim
60 words
In a cutting tool as set forth in claim 1; each of said blades being a straight blade secured to the outer periphery of said tool body generally along the longitudinal axis of the body and angled radially rearwardly from the tool body with respect to the axis of rotation to provide a negative radial rake to said cutting elements.
Claim 8
Dependent Claim
52 words
In a cutting tool as set forth in claim 1; each of said blades being a straight blade secured to the outer periphery of said tool body and angled radially forwardly from the tool body with respect to the axis of rotation to provide a positive radial rake to said cutting elements.
Claim 9
Dependent Claim
27 words
In a cutting tool as set forth in claim 1; each of said blades being a spiral blade mounted about the outer periphery of the tool body.
Claim 10
Dependent Claim
18 words
In a cutting tool as set forth in claim 8; said spiral blades having a negative radial rake.
Claim 11
Dependent Claim
18 words
In a cutting tool as set forth in claim 8; said spiral blades having a positive radial rake.
Claim 12
Dependent Claim
22 words
In a cutting tool as set forth in claim 1; said cutting elements comprising cylindrical discs of a similar size and shape.
Claim 13
Dependent Claim
32 words
In a cutting tool as set forth in claim 1; said cutting elements being of a semi-circular shape arranged in transversely extending rows with the cutting elements in adjacent rows being staggered.
Claim 14
Dependent Claim
25 words
In a cutting tool as set forth in claim 1; said cutting elements in a transversely extending row being alternately of circular and triangular shapes.
Claim 15
Dependent Claim
18 words
In a cutting tool as set forth in claim 1; said cutting elements being of a chevron shape.
Claim 16
Dependent Claim
207 words
In a cutting tool adapted to be positioned downhole in a well bore for removing materials from the well bore; a tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades at spaced intervals on the body and extending outwardly therefrom, each of the blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured to said leading surface of the base each being of a predetermined size and shape and arranged in a predetermined generally symmetrical pattern on the base relative to the other elements, each of said cutting elements having an exposed front cutting face forming a cutting surface, a rear face secured to the leading surface of said base, a peripheral surface extending between said faces, and a relatively sharp edge formed at the juncture of the front face and peripheral surface; the front cutting face of each cutting element defining a surface irregularity therein for directing an extending end portion of a turning cut from said material thereby to effect a breaking of said turning from the material being cut.
Claim 17
Dependent Claim
207 words
In a cutting tool adapted to be positioned downhole in a well bore for removing materials from the well bore; a tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades at spaced intervals on the body and extending outwardly therefrom, each of the blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured to said leading surface of the base each being of a predetermined size and shape and arranged in a predetermined generally symmetrical pattern on the base relative to the other elements, each of said cutting elements having an exposed front cutting face forming a cutting surface, a rear face secured to the leading surface of said base, a peripheral surface extending between said faces, and a relatively sharp edge formed at the juncture of the front face and peripheral surface; the front cutting face of each cutting element defining a surface irregularity therein for directing an extending end portion of a turning cut from said material thereby to effect a breaking of said turning from the material being cut.
Claim 18
Dependent Claim
26 words
ln a cutting tool as set forth in claim 15; said cutting elements comprising cylindrical discs arranged in a plurality of rows on the associated blades.
Claim 19
Dependent Claim
44 words
ln a cutting tool as set forth in claim 16; said cylindrical discs being generally uniform in size and shape and arranged in staggered rows with the cylindrical discs in each row being in a lapping relationship with the cylindrical discs of adjacent rows.
Claim 20
Dependent Claim
41 words
ln a cutting tool as set forth in claim 15; said cutting elements being arranged in transversely extending rows on said blades with the cutting elements in transversely extending rows on adjacent blades being staggered horizontally for following different cutting paths.
Claim 21
Dependent Claim
24 words
In a cutting tool as set forth in claim 15; said deformation in the front face of each cutting element comprises an annular groove.
Claim 22
Dependent Claim
37 words
In a cutting tool as set forth in claim 15; said leading surface of said base having a separate positioning mark thereon for each individual cutting element for precisely positioning the cutting elements in said predetermined pattern.
Claim 23
Dependent Claim
25 words
In a cutting tool as set forth in claim 20; said positioning mark comprising a separate recess in said base to receive each cutting element.
Claim 24
Dependent Claim
56 words
In a cutting tool as set forth in claim 15; said deformation in the front face of each cutting element comprises an annular groove tapering radially inwardly from the peripheral surface and terminating inwardly at an arcuate radius to receive an end of the turning and direct it forwardly with respect to the direction of rotation.
Claim 25
Dependent Claim
195 words
In a cutting tool adapted to be positioned downhole in a well bore for cutting metal members previously positioned in the well bore; a tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades on the body and extending outwardly therefrom, each of said blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured to said leading surface of the base each being of a predetermined size and shape and arranged in a predetermined pattern on the base relative to the other elements, said leading surface having a positioning mark thereon for the cutting elements for precisely positioning the cutting elements on said blade in predetermined rows of the predetermined pattern within a predetermined tolerance; each of said cutting elements having an exposed front cutting face forming a cutting surface and an opposed rear face forming a securing surface, said rear face being secured to the leading surface of said base in accord with the positioning mark for the cutting elements.
Claim 26
Dependent Claim
195 words
In a cutting tool adapted to be positioned downhole in a well bore for cutting metal members previously positioned in the well bore; a tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades on the body and extending outwardly therefrom, each of said blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured to said leading surface of the base each being of a predetermined size and shape and arranged in a predetermined pattern on the base relative to the other elements, said leading surface having a positioning mark thereon for the cutting elements for precisely positioning the cutting elements on said blade in predetermined rows of the predetermined pattern within a predetermined tolerance; each of said cutting elements having an exposed front cutting face forming a cutting surface and an opposed rear face forming a securing surface, said rear face being secured to the leading surface of said base in accord with the positioning mark for the cutting elements.
Claim 27
Dependent Claim
30 words
In a cutting tool as set forth in claim 23; said positioning mark comprises a recess on said leading surface of said blade to receive an associated cutting element therein.
Claim 28
Dependent Claim
26 words
In a cutting tool as set forth in claim 24; the recesses on said blades being arranged in transversely extending rows with adjacent rows being staggered.
Claim 29
Dependent Claim
43 words
In a cutting tool as set forth in claim 25; the depth of said recesses in a transversely extending row thereof progressively increasing in an outward radial direction thereby to provide a negative radial rake to said cutting elements recessed in said row.
Claim 30
Dependent Claim
43 words
In a cutting tool as set forth in claim 25; the depth of said recesses in a transversely extending row thereof progressively decreasing in an outward radial direction thereby to provide a positive radial rake to said cutting elements received in said row.
Claim 31
Dependent Claim
50 words
In a cutting tool as set forth in claim 23; said cutting elements being arranged in transversely extending rows in each blade, the cutting elements on corresponding transversely extending rows on adjacent blades being offset horizontally, whereby the concentric cutting paths of the cutting elements on adjacent blades are offset.
Claim 32
Dependent Claim
35 words
In a cutting tool as set forth in claim 23; said front face being of a larger area than the area of said rear face with said peripheral surface tapering inwardly from said front face.
Claim 33
Dependent Claim
30 words
In a cutting tool as set forth in claim 23; the front cutting face of each cutting element having an annular groove therein for receiving and directing metal turnings downwardly.
Claim 34
Dependent Claim
180 words
In a cutting tool adapted to be positioned downhole in a well bore for cutting away members within the well bore; a generally cylindrical tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades on the body and extending outwardly therefrom, each of said blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured in side by side relation to said leading surface of the base, said leading surface having a separate recess therein for precisely positioning the cutting elements on said blade in a predetermined pattern within a predetermined tolerance; each of said cutting elements being generally identical in size and shape and arranged in a plurality of transversely extending predetermined rows in a generally symmetrical predetermined pattern with the cutting elements in adjacent rows being staggered with respect to each other whereby substantially equal forces are exerted against each cutting element of a row.
Claim 35
Dependent Claim
180 words
In a cutting tool adapted to be positioned downhole in a well bore for cutting away members within the well bore; a generally cylindrical tool body adapted to be received within said well bore and to be supported at its upper end for rotation about a longitudinal axis; a plurality of blades on the body and extending outwardly therefrom, each of said blades having a base with a leading surface relative to the direction of rotation; a plurality of closely spaced cutting elements of hard cutting material secured in side by side relation to said leading surface of the base, said leading surface having a separate recess therein for precisely positioning the cutting elements on said blade in a predetermined pattern within a predetermined tolerance; each of said cutting elements being generally identical in size and shape and arranged in a plurality of transversely extending predetermined rows in a generally symmetrical predetermined pattern with the cutting elements in adjacent rows being staggered with respect to each other whereby substantially equal forces are exerted against each cutting element of a row.
Claim 36
Dependent Claim
32 words
In a cutting tool as set forth in claim 31; said blades having rows of cutting elements on adjacent blades staggered horizontally whereby the cutting paths of adjacent blades are offset horizontally.
Claim 37
Dependent Claim
49 words
In a cutting tool as set forth in claim 31; each of said cutting elements being of a uniform shape and size and having a peripheral surface extending between the front and rear faces thereof, the juncture of the peripheral surface and front face defining a relatively sharp edge.
Claim 38
Dependent Claim
35 words
In a cutting tool as set forth in claim 33; said front face being of a larger area than the area of said rear face with said peripheral surface tapering inwardly from said front face.
Claim 39
Independent Claim
126 words
A method of securing a plurality of cutting elements at precise positions on a generally planar surface of a blade adapted to be mounted on a cutting tool for cutting previously existing casing in a well bore and comprising the following steps: making the planar surface of the blade with a separate mark for each separate cutting element; preassembling in a template all of the cutting elements for the blade in a predetermined pattern identified by the marks on the blades; placing the preassembled cutting elements on the blade with each cutting element positioned precisely thereon with respect to its respective mark; and then brazing the cutting elements onto the surface of the blade for securing the cutting elements thereon in precise relation to each other.
Claim 40
Independent Claim
126 words
A method of securing a plurality of cutting elements at precise positions on a generally planar surface of a blade adapted to be mounted on a cutting tool for cutting previously existing casing in a well bore and comprising the following steps: making the planar surface of the blade with a separate mark for each separate cutting element; preassembling in a template all of the cutting elements for the blade in a predetermined pattern identified by the marks on the blades; placing the preassembled cutting elements on the blade with each cutting element positioned precisely thereon with respect to its respective mark; and then brazing the cutting elements onto the surface of the blade for securing the cutting elements thereon in precise relation to each other.
Claim 41
Independent Claim
127 words
A method of securing a plurality of cutting elements at precise positions on a generally planar surface of a blade adapted to be mounted on a cutting tool for removing material from the well bore and comprising the following steps: forming a plurality of recesses on the planar surface of the blade in a predetermined pattern with a recess for each cutting element; preassembling in a template all of the cutting elements for the blade in the predetermined pattern established by the recesses in said blade; placing the preassembled cutting elements on the blade in alignment with the recesses receiving the cutting elements therein; and brazing the cutting elements onto the surface of the blade for securing the cutting elements in the recesses in the predetermined pattern.
Claim 42
Independent Claim
127 words
A method of securing a plurality of cutting elements at precise positions on a generally planar surface of a blade adapted to be mounted on a cutting tool for removing material from the well bore and comprising the following steps: forming a plurality of recesses on the planar surface of the blade in a predetermined pattern with a recess for each cutting element; preassembling in a template all of the cutting elements for the blade in the predetermined pattern established by the recesses in said blade; placing the preassembled cutting elements on the blade in alignment with the recesses receiving the cutting elements therein; and brazing the cutting elements onto the surface of the blade for securing the cutting elements in the recesses in the predetermined pattern.
Claim 43
Dependent Claim
28 words
The method as set forth in claim 36 further including the step of forming the template from the material utilized for brazing the cutting elements on the blade.
References Cited (Backward Citations)
No citation records indexed.
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