FIELD: well drilling technology.
SUBSTANCE: device has drive connected to working tool by intermediate shaft containing consecutively mounted and eccentrically mounted relatively to rotation axis conic and cylindrical rollers. Working tool is made in form of attachable modules serially mounted on rotation axis - backward movement module, well forming module, forward movement module and headpiece. Well forming module is made of cylindrical rollers of same diameter. Modules of straight and backward drives are made of cylindrical rollers of various diameter and conical rollers, while modules rollers are mounted in diameters decrease order in direction of ends of working tool.
EFFECT: higher productiveness.
3 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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