FIELD: mining, particularly oil, water, gas and underground leaching well drilling.
SUBSTANCE: well drilling device comprises drilling string, drilling head including body with projecting sizing, radial conical cutting, end and support parts. Sizing parts have reverse taper to provide sizing and drilling of non-drilled well bore sections created during direct drilling by reverse drilling. Support parts are arranged in upper body part and made as centrators supported by non-drilled well bore sections formed during direct drilling.
EFFECT: improved efficiency due to increased drilling rate and provision of separate drilling and well sizing operations.
1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| WELL DRILLING METHOD | 2006 |
|
RU2320841C1 |
| DOWNHOLE REAMER | 2006 |
|
RU2315849C1 |
| WELL DRILLING RIG | 2003 |
|
RU2254433C1 |
| DEVICE FOR HOLE BORING | 2006 |
|
RU2327026C2 |
| WELL BORING METHOD AND DEVICE | 2004 |
|
RU2254434C1 |
| METHOD AND TOOL FOR FILTERING WELL CONSTRUCTION | 2003 |
|
RU2250309C1 |
| METHOD AND APPARATUS FOR FILTER WELL FORMING | 2003 |
|
RU2252303C1 |
| FILTERING WELL CONSTRUCTION METHOD | 2006 |
|
RU2309243C1 |
| WELL-DRILLING DEVICE | 2003 |
|
RU2250343C1 |
| WELL EXPANDER | 2003 |
|
RU2244796C1 |
