«Proceedings of Gubkin University»

Prospective design of the cutting structure of a roller reamer for a boring unit

UDC: 622.244.23
DOI: -

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation
² Ukhta State Technical University, Ukhta, Russian Federation

Keywords: drill bit, tungsten carbide armament, roller reamer, drill string, circulation system, stepped ring-shaped face

Annotation:

The article presents a promising design of the armament for roller reamers used in tunneling machines designed to construct underground pipelines under various purposes in complex geological conditions. The practice of drilling with roller reamers, both multi-cone and single-cone types, on hard and abrasive rocks shows their insufficient efficiency in these drilling conditions, manifested by a significant reduction in mechanical penetration rate. To improve the performance of this type of drilling tool, a new advanced design of roller armament has been developed. The essence of the development lies in the fact that the teeth of the roller armament are arranged so as to form a conical stepped ring-shaped face when acting on the rock. This is achieved through the use of specially shaped rollers, whose generating line consists of several crowns, each located at some distance from the previous one, while tangents to their surfaces intersect the axis of rotation of the tool at the same point as the axis of rotation of the roller itself. This design solution minimizes slippage of all crown teeth during roller movement along the face, and also allows increasing the size of the small rolling bearing support, wear of which usually prevails during tool operation. Equipping tunneling machine drill strings with rollers of the proposed design will increase the mechanical drilling speed, extend the life of bearing units, and thereby reduce the time and cost of constructing underground pipeline crossings for various purposes.

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