Force modulation system for a drill bit

Patent metadata

Field	Value
Publication number	US-2023015607-A1
Application number	US-202217935126-A
Country	US
Kind code	A1
Filing date	Sep 25, 2022
Priority date	Nov 21, 2020
Publication date	Jan 19, 2023
Grant date	—

Abstract

The force modulation system for a drill bit includes a cutter, a holder, a holder retention device, and a first force member. The cutter fits in the holder, and the holder fits in the drill bit. The holder retention device exerts a holder retention force in a first direction. The first force member exerts a first force in a second direction. The second direction is angled offset to the first direction so as that the cutting profile of the force modulation system is now variable in the second direction, according to the first force. There can also be a second force member to exert a second force in the first direction for more variability of the cutting profile in the first direction. The second force member can be made integral with the first force member.

First claim

1 . A force modulation system for a drill bit, comprising:
a cutter being comprised of a cutter body having a cutting end, and a cutting surface made integral with said cutter body at said cutting end; a holder being comprised of a holder body having an anchor end, a holding end opposite said anchor end, holder sides between said anchor end and said holding end, and a holder cavity at said holding end, said cutter body being in removable slide fit engagement with said holder cavity; a holder retention means positioned on at least one holder side so as to exert a holder retention force in a first direction of said holder; a first force member positioned against said holder so as to exert a first force in a second direction of said holder, said second direction being angled offset to said first direction; and a second force member positioned against said holder so as to exert a second force in said first direction of said holder, wherein said first direction is a direction of movement of said holder and said cutter relative to the drill bit, and wherein said second direction is another direction of movement of said holder and said cutter relative to the drill bit, and wherein said second direction is offset from said first direction so as to avoid damage from excessive force on said cutter in directions other than said first direction.

2 . The force modulation system, according to claim 1 , said cutter being removably engaged with said holder, said cutting surface being extended from said holder so as to cut a rock formation.

3 . The force modulation system, according to claim 1 , wherein said holder has an initial position relative to said holder retention means and an initial back rake angle, and wherein said holder has an active drilling position relative to said holder retention means and an active drilling back rake angle, said holder being actuatable between said initial position and said active drilling position.

4 . The force modulation system, according to claim 3 , wherein said holder is actuatable between initial position and said active drilling position by one of a group consisting of: translational movement of said holder relative to said holder retention means and rotational movement of said holder relative to said holder retention means.

5 . The force modulation system, according to claim 1 , wherein said second direction is orthogonal to said first direction.

6 . (canceled)

7 . (canceled)

8 . The force modulation system, according to claim 1 , wherein said holder retention force is greater than said second force.

9 . The force modulation system, according to claim 1 , wherein first force member is made integral with said second force member.

10 . The force modulation system, according to claim 9 , wherein said first force member being made integral with said second force member is comprised of a first spring portion, a second spring portion, and a hinge portion between said first spring portion and said second spring portion, said second force member being comprised of said second spring portion.

11 . The force modulation system, according to claim 10 , wherein said cutter retention force greater than holder retention force.

12 . The force modulation system, according to claim 1 , wherein said holder sides are longer than said anchor end and said holding end so as to form an elongated holder body having said anchor end, said holding end opposite said anchor end and elongated holder sides as said holding sides.

13 . The force modulation system, according to claim 12 , wherein said elongated holder body is comprised of an anchor portion between said holder cavity and said anchor end, said first direction being along said elongated holder sides.

14 . The force modulation system, according to claim 13 ,
wherein said second force member is positioned against said anchor end of said holder so as to exert said second force in said first direction of said holder.

15 . The force modulation system, according to claim 14 , wherein said holder retention force is greater than said second force.

16 . The force modulation system, according to claim 14 , wherein first force member is made integral with said second force member.

17 - 20 . (canceled)

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc Cnpc

Inventors

• Zhang Ming
• Cheng Chris
• Yu Jiaqing
• Yang Xiongwen

Classifications

• E21B12/00

  Accessories for drilling tools · CPC title

• E21B10/573 Primary

  characterised by support details, e.g. the substrate construction or the interface between the substrate and the cutting element · CPC title

• E21B10/42

  Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits (characterised by wear resisting parts E21B10/46; by conduits or nozzles for drilling fluid E21B10/60; by detachable or adjustable parts E21B10/62) · CPC title

• E21B10/62 Primary

  characterised by parts, e.g. cutting elements, which are detachable or adjustable (E21B10/64 takes precedence; for roller bits E21B10/20; for augers E21B10/44) · CPC title