FIELD: rock-cutting tool, particularly crown bits for expendable well drilling.
SUBSTANCE: drilling crown comprises body and diamondiferous matrix fastened to the body and divided into several sectors with grooves. The sectors are reinforced with wear-resistant cylindrical inserts made of synthetic diamonds having different diameters. The inserts are arranged in central part of each sector along a circle having predetermined diameter. Insert diameters decrease in peripheral direction.
EFFECT: decreased power inputs for rock cutting during the whole tool operation life, increased efficiency of mud removal from zone to be treated and, as a result, improved rock-cutting ability along with penetration speed increase.
4 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| BIT | 2004 |
|
RU2263197C1 |
| DRILL BIT | 2008 |
|
RU2367764C1 |
| CROWN BIT | 2011 |
|
RU2478767C2 |
| DIAMOND DRILL BIT | 0 |
|
SU1303697A1 |
| DIAMOND DRILL BIT | 1991 |
|
RU2024727C1 |
| DIAMOND CROWN BIT | 0 |
|
SU1441056A1 |
| DIAMOND-CARBIDE PLATE | 2012 |
|
RU2541241C2 |
| CROWN BIT | 0 |
|
SU1361293A1 |
| 0 |
|
SU1778264A1 | |
| DIAMOND CROWN BIT | 2005 |
|
RU2287657C1 |
