Diamond drill bit

Claim 2

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having first fluid passage means for feeding fluid from the interior of said body to said primary waterways, means for decreasing the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways to induce flow of fluid from said primary waterways across the lands to said secondary waterways, comprising second fluid passage means communicating with the interior of said body and proportioned to discharge fluid into said secondary waterways at a substantially higher velocity than the velocity of the fluid flowing through said primary waterways, each of said second fluid passage means extending laterally outwardly of said body and being inclined substantially to a radial plane passing through the axis of said body.

Claim 3

In a rotary bit as defined in claim 1; said body having an outer vertical face extending upwardly from said cutting face, said vertical face having vertical grooves therein communicating with and extending upwardly from the outer ends of said primary and secondary waterways.

Claim 4

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having first fluid passage means for feeding fluid from the interior of said body to said primary waterways, said body having second fluid passage means for jetting fluid from the interior of said body into said secondary waterways, whereby the jetting fluid decreases the fluid pressure in said secondary waterways beloW the fluid pressure in said primary waterways to induce flow of fluid from said primary waterways across the lands to said secondary waterways; said second fluid passage means being inclined laterally outwardly and in the direction of rotation of the bit.

Claim 5

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having first fluid passage means for feeding fluid from the interior of said body to said primary waterways, said body having second fluid passage means for jetting fluid from the interior of said body into said secondary waterways, whereby the jetting fluid decreases the fluid pressure in said secondary waterways beloW the fluid pressure in said primary waterways to induce flow of fluid from said primary waterways across the lands to said secondary waterways; said second fluid passage means being inclined laterally outwardly and in the direction of rotation of the bit.

Claim 6

In a rotary bit as defined in claim 3, said second fluid passage means also being inclined downwardly of the bit.

Claim 7

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having first fluid passage means for feeding fluid from the interior of said body to said primary waterways, said body having second fluid passage means for jetting fluid from the interior of said body into said secondary waterways, whereby the jetting fluid decreases the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways to induce flow of fluid from said primary waterways across the lands to said secondary waterways; said primary waterways being of progressively decreasing cross-sectional area in a direction laterally outwardly of the cutting face.

Claim 8

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having first fluid passage means for feeding fluid from the interior of said body to said primary waterways, said body having second fluid passage means for jetting fluid from the interior of said body into said secondary waterways, whereby the jetting fluid decreases the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways to induce flow of fluid from said primary waterways across the lands to said secondary waterways; said primary waterways being of progressively decreasing cross-sectional area in a direction laterally outwardly of the cutting face.

Claim 9

In a rotary bit as defined in claim 5; said second fluid passage means being inclined downwardly and laterally outwardly of the bit and also being inclined in the direction of rotation of the bit.

Claim 10

In a rotary bit as defined in claim 5; said body having an outer vertical face extending upwardly from said cutting face, said vertical face having vertical grooves therein communicating with and extending upwardly from the outer ends of said primary and secondary waterways, said second fluid passage means being inclined downwardly and laterally outwardly of the bit and also being inclined in the direction of rotation of the bit.

Claim 11

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having a main fluid passage for receiving fluid from a tubular drilling string to which the body is securable, said body having distribution ports for feeding fluid from said main fluid passage to the inner portions of said primary waterways, said body having jet passages communicating with said main fluid passage and opening into said secondary waterways for jetting fluid under high velocity into said secondary waterways to decrease the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways, said jet passages being proportioned to discharge fluid into said secondary waterways at a substantially higher velocity than the velocity of the fluid flowing through said primary waterways, each of said jet passages extending laterally outwardly of said body and being inclined substantially to a radial plane passing through the axis of said body.

Claim 12

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having a main fluid passage for receiving fluid from a tubular drilling string to which the body is securable, said body having distribution ports for feeding fluid from said main fluid passage to the inner portions of said primary waterways, said body having jet passages communicating with said main fluid passage and opening into said secondary waterways for jetting fluid under high velocity into said secondary waterways to decrease the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways, said jet passages being proportioned to discharge fluid into said secondary waterways at a substantially higher velocity than the velocity of the fluid flowing through said primary waterways, each of said jet passages extending laterally outwardly of said body and being inclined substantially to a radial plane passing through the axis of said body.

Claim 13

In a rotary bit as defined in claim 8; each of said distribution ports feeding fluid into a plurality of primary waterways, said primary waterways diverging from one another in a direction laterally outwardly of the body.

Claim 14

In a rotary bit as defined in claim 8; said body having an outer vertical face extending upwardly from said cutting face, said vertical face having vertical grooves therein communicating with and extending upwardly from the outer ends of said primary and secondary waterways.

Claim 15

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having a main fluid passage for receiving fluid from a tubular drilling string to which the body is securable, said body having distribution ports for feeding fluid from said main fluid passage to the inner portions of said primary waterways, said body having jet passages communicating with said main fluid passage and opening into said secondary waterways for jetting fluid under high velocity into said secondary waterways to decrease the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways; each of said jet passages being inclined downwardly and laterally outwardly of the body and also being inclined in the direction of rotation of the bit.

Claim 16

In a rotary bit: a body having a cutting face for drilling a bore hole, said face comprising a plurality of spaced lands extending laterally from an inner portion of the face to the outer portion of the face, said cutting face having primary and secondary waterways defining said lands and separating said lands from each other, said body having a main fluid passage for receiving fluid from a tubular drilling string to which the body is securable, said body having distribution ports for feeding fluid from said main fluid passage to the inner portions of said primary waterways, said body having jet passages communicating with said main fluid passage and opening into said secondary waterways for jetting fluid under high velocity into said secondary waterways to decrease the fluid pressure in said secondary waterways below the fluid pressure in said primary waterways; each of said jet passages being inclined downwardly and laterally outwardly of the body and also being inclined in the direction of rotation of the bit.

Claim 17

In a rotary bit as defined in claim 11; said primary waterways being of progressively decreasing cross-sectional area in a direction laterally outwardly of the cutting face.

Claim 18

In a rotary bit as defined in claim 11; each of said distribution ports feeding fluid into a plurality of primary waterways which diverge from one another in a direction laterally outwardly of the body.

Claim 19

In a rotary bit as defined in claim 11; said primary waterways being of progressively decreasing cross-sectional area in a direction laterally outwardly of the cutting face, each of said distribution ports feeding fluid into a plurality of primary waterways which diverge from one another in a direction laterally outwardly of the body.

Claim 20

In a rotary bit as defined in claim 11; said body having an outer vertical face extending upwardly from said cutting face, said vertical face having vertical grooves therein communicating with and extending upwardly from the outer ends of said primary and secondary waterways, said primary waterways being of progressively decreasing cross-sectional area in a direction laterally outwardly of the cutting face.

Claim 21

In a rotary bit as defined in claim 11; said body having an outer vertical face extending upwardly from said cutting face, said vertical face having vertical grooves therein communicating with and extending upwardly from the outer ends of said primary and secondary waterways, said primary waterways being of progressively decreasing cross-sectional area in a direction laterally outwardly of the cutting face, each of said distribution ports feeding fluid into a plurality of primary waterways which diverge from one another in a direction laterally outwardly of the body.