FIELD: oil and gas industry.
SUBSTANCE: drilling bit includes lugs with inclined trunnions, on which rolling cutters, the rear part of which is reinforced with rock destruction teeth, are installed; with that, rolling cutters are fixed on a trunnion by means of fasteners, the inner end of each of which is combined with an annular groove of the trunnion. Each fastener is made in the form of a single stepped rod; with that, step of larger diameter is provided with a slot located on its side surface and combined with a shank of a rock-destruction tooth, which is installed on rear part of the rolling cutter. Step of the fastener of larger diameter can be provided with an axial channel, in which a rock destruction element is fixed.
EFFECT: increasing operational life of a bit; improving fixation reliability of rolling cutters on trunnions.
2 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DRILLING ROCK BIT | 2012 |
|
RU2495217C1 |
| DRILL BIT AND METHOD OF ITS ASSEMBLY | 2012 |
|
RU2493349C1 |
| DRILLING ROLLER BIT | 2009 |
|
RU2387787C1 |
| SUPPORT OF CONE-ROCK BIT AND MOUNTING METHODS (OPTIONS) | 2006 |
|
RU2327849C1 |
| ROTARY DRILLING BIT (VERSIONS) | 2012 |
|
RU2494216C1 |
| BORING ROLLING CUTTER BIT | 2008 |
|
RU2364699C1 |
| CONE BIT SUPPORT (VERSIONS) | 2008 |
|
RU2374419C1 |
| DRILL BIT BEARING STRUCTURE | 2007 |
|
RU2347058C1 |
| ROLLING CUTTER DRILLING BIT | 2005 |
|
RU2291270C1 |
| ROLLING DRILLING BIT | 2009 |
|
RU2389858C1 |
