FIELD: process engineering.
SUBSTANCE: invention relates to hybrid drill bits. A drill bit with a set of cutters and fixed blades comprises a drill bit body with the central lengthwise axis. The top end of the drill bit configuration allows the drill bit to be connected to a drill string. A preset number of the fixed blades extend downward from the drill bit in the axial direction. A preset number of the cutters are arranged to spin at the drill bit body. Several cutting elements of the fixed blades are arranged on every fixed blade. The fixed blades and cutters are arranged asymmetrically. A preset number of the fixed blades are larger than that of the cutters by at least one. At least one fixed blade cutting element on at least one fixed blade is arranged to cut the rock along the drill bit central axis.
EFFECT: developing the dynamically stable drill bit with the set of cutters and fixed blades with improved drilling performances.
13 cl, 3 dwg
| Title |
Year |
Author |
Number |
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- Mark Blehkmen
|
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|
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|
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|
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2016 |
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| ROCK DRILLING BIT WITH SLURRY RETRIEVER |
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|
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2012 |
- Riks Gregori L.
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|
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RU2669623C1 |
