FIELD: mining.
SUBSTANCE: drilling reamer includes tubular housing having the nose part with inbent middle part, and several blades forming the cuttings lifting grooves between them and passing along the axis from nose part. Multiple cutting elements are located on front edges of bit blades in rotation direction and on axial front ends of blades. Tungsten carbide is applied to separate surfaces and edges of blades. At that, configuration of cover of nose part is chosen so that drilling from its centre to side wall of the housing can be provided. Drilling method of drilling reamer has been also described.
EFFECT: increasing lowering efficiency of casing pipe into the well.
19 cl, 7 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| CASING STRING BIT AND SPUDDING BIT | 2010 |
|
RU2544946C2 |
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|
RU2513562C2 |
| HYBRID DRILL BIT | 2010 |
|
RU2564320C2 |
| DRILLING BITS WITH ANTI-TRECKING PROPERTIES | 2011 |
|
RU2598388C2 |
