Ultra-hard drill collar
View Patent ↗A drill collar formed substantially entirely from a metal matrix material and one or more metal alloys, the drill collar being produced through a molding process. The metal matrix material of the drill collar minimizes lateral movement and vibration during drilling operations, while providing a weight greater than that of conventional drill collar materials, thereby enabling construction of drill collars and bottom hole assemblies having a reduced length.
1. A bottom hole assembly comprising a first drill collar in communication with a drilling string and a drill bit, wherein the first drill collar is formed substantially entirely from a metal matrix material comprising a matrix of tungsten carbide particles having at least one metal alloy disposed within spaces between said particles, wherein the first drill collar has a bore extending therethrough for permitting flow of drilling fluids, wherein the first drill collar comprises a first yield strength and the drilling string comprises a second yield strength, and wherein the metal matrix material and the at least one metal alloy minimize lateral movement or vibration of the first drill collar during drilling; and
a transition drill collar disposed between the drilling string and the first drill collar, wherein the transition drill collar comprises a third yield strength greater than the first yield strength and less than the second yield strength such that lateral movement and vibration of the drilling string is transferred to the transition drill collar prior to transference of the lateral movement and vibration to the first drill collar,
wherein the first drill collar comprises a first channel extending therethrough on a first side of the first drill collar and a second channel on a second side of the first drill collar opposite the first side, and wherein the second channel prevents unbalancing of the first drill collar.
2. The bottom hole assembly of claim 1 , wherein the metal matrix material comprises waste tungsten carbide.
3. The bottom hole assembly of claim 1 , wherein the at least one metal alloy comprises nickel, cobalt, iron, monel, or combinations thereof.
4. The bottom hole assembly of claim 1 , wherein the first drill collar comprises a length less than 30 feet.
5. The bottom hole assembly of claim 1 , wherein the first drill collar comprises a length of less than or equal to 12 feet.
6. The bottom hole assembly of claim 1 , wherein the first drill collar comprises a polygonal prismatic shape, a spiral cast shape, or combinations thereof.
7. The bottom hole assembly of claim 1 , further comprising an end piece secured to the first drill collar, wherein the end piece is formed from a material other than the metal matrix material and one or more metal alloys that form the first drill collar.
8. The bottom hole assembly of claim 7 , wherein the end piece comprises a box end, a pin end, or combinations thereof comprising threads for securing the first drill collar to adjacent objects.
9. The bottom hole assembly of claim 1 , wherein the bottom hole assembly comprises a length of less than 300 feet.
10. The bottom hole assembly of claim 1 , wherein the bottom hole assembly comprises a length of less than or equal to 200 feet.
11. The bottom hole assembly of claim 1 , further comprising a data transmission component comprising a conductor extending through the first channel.
12. The bottom hole assembly of claim 1 , wherein the first channel extends through the first drill collar in a spiraled orientation to prevent the first channel from creating an imbalance in the drill collar.