US5058666A — Cutting tool for removing materials from well bore

Claim 1

Independent Claim 226 words

In a cutting tool adapted to be positioned downhole in a well bore for removing a metal member 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 in a plurality of transversely extending rows, each cutting element 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 being arranged and constructed for directing an extending end portion of a turning cut form said member to effect a breaking of said turning from the member being cut in a predetermined manner to minimize internesting of the turnings.

Claim 2

Dependent Claim 226 words

In a cutting tool adapted to be positioned downhole in a well bore for removing a metal member 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 in a plurality of transversely extending rows, each cutting element 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 being arranged and constructed for directing an extending end portion of a turning cut form said member to effect a breaking of said turning from the member being cut in a predetermined manner to minimize internesting of the turnings.

Claim 3

Dependent Claim 26 words

In a cutting tool as set forth in claim 1; said cutting elements comprising cylindrical discs arranged in a plurality of rows on the associated blades.

Claim 4

Dependent Claim 44 words

In a cutting tool as set forth in claim 2; 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 5

Dependent Claim 41 words

In a cutting tool as set forth in claim 1; 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 6

Dependent Claim 31 words

In a cutting tool as set forth in claim 1; said front face of each cutting element having a deformation for receiving and directing an extending end portion of a turning.

Claim 7

Dependent Claim 37 words

In a cutting tool as set forth in claim 1; 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 8

Dependent Claim 25 words

In a cutting tool as set forth in claim 6; said positioning mark comprising a separate recess in said base to receive each cutting element.

Claim 9

Dependent Claim 56 words

In a cutting tool as set forth in claim 5; 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 10

Dependent Claim 65 words

In a cutting tool as set forth in claim 1; said front face of each cutting element being inclined with respect to the rotational axis of the cutting tool at a negative axial rake angle of between two degrees and twenty degrees to contact and direct an extending end portion of a turning cut from said member to aid in a breaking of said turning.

Claim 11

Dependent Claim 49 words

In a cutting tool as set forth in claim 1; said front face of at least some of said elements being formed with a surface irregularity to contact and direct an extending end portion of a turning cut from said member to aid in a breaking of said turning.

Claim 12

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 13

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 14

Dependent Claim 30 words

In a cutting tool as set forth in claim 11; said positioning mark comprises a recess on said leading surface of said blade to receive an associated cutting element therein.

Claim 15

Dependent Claim 26 words

In a cutting tool as set forth in claim 12; the recesses on said blades being arranged in transversely extending rows with adjacent rows being staggered.

Claim 16

Dependent Claim 43 words

In a cutting tool as set forth in claim 13; 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 17

Dependent Claim 43 words

In a cutting tool as set forth in claim 13; 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 18

Dependent Claim 50 words

In a cutting tool as set forth in claim 11; 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 19

Dependent Claim 35 words

In a cutting tool as set forth in claim 11; 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 20

Dependent Claim 30 words

In a cutting tool as set forth in claim 11; the front cutting face of each cutting element having an annular groove therein for receiving and directing metal turnings downwardly.

Claim 21

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 22

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 23

Dependent Claim 32 words

In a cutting tool as set forth in claim 19; said blades having rows of cutting elements on adjacent blades staggered horizontally whereby the cutting paths of adjacent blades are offset horizontally.

Claim 24

Dependent Claim 49 words

In a cutting tool as set forth in claim 19; 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 25

Dependent Claim 35 words

In a cutting tool as set forth in claim 21; 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.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-10-21	1995-04-22	1995-10-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-10-21	1999-04-22	1999-10-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-10-21	2003-04-22	2003-10-22	$7700.00	Window Closed / Lapsed

Cutting tool for removing materials from well bore

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