Drill bit with effective side rake for weight on bit reducing effect
AssigneeVarel Energy Oil Field Equipment Trading L.L.C
InventorVincent Tissot
Life of this patent
Estimating the term…
Abstract
A bit for drilling a wellbore includes: a body; and a crown. The crown includes: a cone section and a shoulder section; a plurality of blades protruding from the body, each blade extending from a center of the crown and across the shoulder section; and a row of superhard cutters mounted along each blade, each cutter mounted in a pocket formed adjacent to a leading edge of the blade. Each row has a plurality of inner cutters located in the cone section. Each inner cutter has an inclined face oriented to decline toward the center of the crown for creating an effective negative side rake angle while drilling with the drill bit and a weight on bit (WOB) reducing effect. Each of the rest of the cutters are oriented such that an overall effect for the bit is the WOB reducing effect.
Claims19
A bit for drilling a wellbore, comprising:
- a body;
- and
- a crown comprising:
- a cone section and a shoulder section;
- of at least three blades protruding from the body, each blade extending from a center of the crown and across the shoulder section;
- and
- a row of superhard cutters mounted along each blade, each cutter mounted in a pocket formed adjacent to a leading edge of the blade,
- wherein:
- each row has a plurality of inner cutters located in the cone section,
- each inner cutter has an inclined face oriented to decline toward the center of the crown for creating an effective negative side rake angle while drilling with the drill bit and a weight on bit (WOB) reducing effect,
- each of the rest of the cutters are oriented such that an overall effect for the bit is the WOB reducing effect,
- each inclined face is a first inclined face,
- each inner cutter has a central ridge and a second inclined face opposed to the first inclined face,
- the inner cutters are arranged in a reverse spiral layout to concentrate a cutting area on the first inclined faces, and
- the effective negative side rake angle is a net effective negative side rake angle.
A bit for drilling a wellbore, comprising:
- a body;
- and
- a crown comprising:
- a cone section and a shoulder section;
- at least three blades protruding from the body, each blade extending from a center of the crown and across the shoulder section;
- and
- a row of superhard cutters mounted along each blade, each cutter mounted in a pocket formed adjacent to a leading edge of the blade,
- wherein:
- each row has a plurality of outer cutters located in the shoulder section,
- each outer cutter has an inclined face oriented to decline away from the center of the crown for creating an effective positive side rake angle while drilling with the drill bit and a weight on bit (WOB) reducing effect,
- each of the rest of the cutters are oriented such that an overall effect for the bit is the WOB reducing effect,
- each inclined face is a first inclined face,
- each outer cutter has a central ridge and a second inclined face opposed to the first inclined face,
- the outer cutters are arranged in a forward spiral layout to concentrate a cutting area on the first inclined faces, and
- the effective positive side rake angle is a net effective positive side rake angle.
A bit for drilling a wellbore, comprising:
- a body;
- and
- a crown comprising:
- a cone section and a shoulder section;
- a plurality of blades protruding from the body, each blade extending from a center of the crown and across the shoulder section;
- and
- a row of superhard cutters mounted along each blade, each cutter mounted in a pocket formed adjacent to a leading edge of the blade,
- wherein:
- each row has a plurality of inner cutters located in the cone section,
- each inner cutter has an inclined face oriented to decline toward the center of the crown for creating an effective negative side rake angle while drilling with the drill bit and a weight on bit (WOB) reducing effect,
- each of the rest of the cutters are oriented such that an overall effect for the bit is the WOB reducing effect, and
- each inner cutter only has one inclined face in one direction extending across a cutting table thereof.
A bit for drilling a wellbore, comprising:
- a body;
- and
- a crown comprising:
- a cone section and a shoulder section;
- a plurality of blades protruding from the body, each blade extending from a center of the crown and across the shoulder section;
- and
- a row of superhard cutters mounted along each blade, each cutter mounted in a pocket formed adjacent to a leading edge of the blade,
- wherein:
- each row has a plurality of outer cutters located in the shoulder section,
- each outer cutter has an inclined face oriented to decline away from the center of the crown for creating an effective positive side rake angle while drilling with the drill bit and a weight on bit (WOB) reducing effect,
- each of the rest of the cutters are oriented such that an overall effect for the bit is the WOB reducing effect, and
- each outer cutter only has one inclined face in one direction extending across a cutting table thereof.
Dependencies are inferred from the claim text.