«Onshore and offshore oil and gas well construction»

Study of the interaction of drill bits’ peripheral teeth rows with a negative offset of cones centerlines with the bottom hole and the well wall

UDC: 622.24.051
DOI: 10.33285/0130-3872-2022-5(353)-21-28

Authors:

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

Keywords: well drilling, rolling-cutter drill bit, rolling cutter, sliding of drill bits cutting structures, penetration per the tool, calibrating cone, ROP

Annotation:

The article presents the results of a study of the interaction of drill bits’ peripheral teeth rows with a negative offset of cones centerlines with the bottom hole and the well wall. The conducted studies allowed revealing the fact that bits equipped with rolling cutters with rotation axes offsetting in parallel to the negative side relative to the tool rotation axis initially work with the formation of an arc-like transition zone from the well wall to the bottomhole surface. In this case, the geometry and curvature of the transition zone depends on the maximum diameter of the peripheral teeth raw of a rolling cutter and the magnitude of its offsetting relative to the bit rotation axis. In addition, the operation of the bit with negatively parallel-offsetting axes of the rolling cutters due to the "bottom-upwards" well wall calibration is accompanied by additional pressing of the teeth cutting structure to the bottomhole surface, and an axial force of the destructed rock reaction is created on the rolling cutter, directed to the center of the bit. Thus, the conducted studies made it possible to reveal that the geometry of the peripheral teeth rows of the bits equipped with rolling cutters, negatively parallel-offsetting relative to the tool rotation axis, is not optimal and requires adjustment in order to comply with the nature of the cutting structures interaction with the rock being destroyed.

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