FIELD: well drilling, particularly drill bits characterized by parts or cutting elements which are detachable or adjustable.
SUBSTANCE: drill bit comprises body connected to drill string and channel formed in the body to transfer liquid between drill string interior and ambient space surrounding the body. The channel may be selectively closed with closing member. Drill bit comprises one or several conical roller cutters. Closing member may be releasably installed on drill bit body and slide outwards from closed position in opened position. The closing member includes at least one conical roller cutter.
EFFECT: simplified access to well interior.
12 cl, 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DURABLE DRILL BIT FOR DRILLING BLASTHOLES IN HARD ROCK (OPTIONS) | 2017 |
|
RU2747633C2 |
| DRILL BIT | 2000 |
|
RU2179619C2 |
| ROLLER BIT | 2002 |
|
RU2222683C2 |
| INSERTED ROLLER BIT | 1999 |
|
RU2172386C1 |
| DRILL BIT | 0 |
|
SU1002504A1 |
| DRILL BIT | 1996 |
|
RU2095539C1 |
| DEVICE FOR WELL DRILLING IN INCOMPETENT AND DECAYED ROCK ALONG WITH WELL CASING | 2004 |
|
RU2262578C1 |
| METHOD FOR DRILLING AND LINING THE WELLBORE AND DEVICE FOR ITS REALIZATION | 1992 |
|
RU2030555C1 |
| THREE-ROLLER BIT | 2002 |
|
RU2222684C2 |
| ROLLER-CUTTER DRILLING BIT | 2001 |
|
RU2182213C1 |
