Improvement of the cutting structures of the rolling cutter drill bits

Bogomolov, R.M.; Serikov, D.Yu.

doi:10.30713/1999-6934-2018-5-24-28

Cited by 2 publications

(1 citation statement)

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“…С кинематической точки зрения движение шарошки по забою выглядит как перекатывание многогранника, которое сопровождается ударами при опускании очередного угла многогранника на поверхность забоя. При налипании породы углы многогранника сглаживаются, что существенно снижает эффективность ударов [5]. В результате общая эффективность разрушения снижается, и работа долота частично переходит из области динамического удара в область разрушения статическим давлением.…”

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Comparative analysis of roller drill bit performance

Шигин¹,

Boreyko²,

Tskhadaya³

et al. 2021

SOCAR Proceedings

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Currently, roller bits are widely used in rock drilling, which are devices with rotating rollers armed with teeth. There are various approaches in assessing the effectiveness of rock destruction by a roller drilling tool, which can be conditionally divided into structural and technological ones. In addition, all the efficiency factors of the roller bit are related to the correspondence of its characteristics and the drilling process to the properties of the rock it destroys. The article analyzes the operating conditions of the roller bit during drilling of rocks of various hardness. On the example of operation of a two-screw drill bit, the process of power interaction of the toothed weapon with rock is considered depending on various factors, such as the shape and pitch of the teeth, angle of inclination, sharpness of the tooth and others. It is shown that kinematic characteristics of interaction of toothed armament with drilled rock have a significant influence on efficiency of process of face destruction. Keywords: drill bit; drilling tool; destruction; drilling; roller cutter; rock.

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Comparative analysis of roller drill bit performance

Шигин¹,

Boreyko²,

Tskhadaya³

et al. 2021

SOCAR Proceedings

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Theoretical studies on the nature and conditions of interaction of heel and peripheral nose cones of offset roller cone bits with a bottom hole

Boreiko

Lutoev

Serikov

2022

Min.Sci.Technol. (RUS)

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An offset of roller cone rotation centerlines is used to increase the mechanical penetration rate while drilling in soft rocks. This enables increasing the area of a cutting structure teeth contact with a bottom hole. The analysis of offset cone drill bit (cutting structure) teeth wear showed that particularly significant wear is characteristic of the transition zone from the heel cone to the nose cone; which leads to significant reduction in the mechanical rate of penetration and a rapid decrease in the hole diameter. The purpose of this paper is to conduct a theoretical research on the nature and conditions of interaction between heel and peripheral nose cones of offset roller cone bits with a bottom hole; which is aimed at improving the efficiency of rock cutting by offset roller cone bits. To achieve the purpose; the authors analyzed data on the nature and causes of wear of existing offset roller cone bit cutting structure (teeth); developed a mathematical model in a cylindrical coordinate system allowing to determine the location and geometric parameters of the gage cone contact area with the hole wall for different roller cone bits sizes; developed a computer solid model for checking the adequacy of the mathematical model by comparing these two models; prepared recommendations for further improvement of the design of existing offset roller cone bit cutting structure (teeth). The research was carried out by the method of mathematical simulation of geometric figures and bodies corresponding to roller cones and a hole. The research has revealed that significant adjustments need to be made to the geometry of the roller cone teeth (currently being patented). This would allow decreasing the areas of cone heel blunting by 15–20 % as well as providing more prolonged contact of base and gage cones with bottom hole and wall surfaces. This allows to reduce wear of teeth in the transition zone of the generatrix from the peripheral nose cone to the gage (heel) cone of the roller cone and to maintain the required specific pressure on the cut rock for a longer period of time and; as a result; to increase both the mechanical penetration rate and the service life of the drilling tools.

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Improvement of the cutting structures of the rolling cutter drill bits

Cited by 2 publications

References 0 publications

Comparative analysis of roller drill bit performance

Comparative analysis of roller drill bit performance

Theoretical studies on the nature and conditions of interaction of heel and peripheral nose cones of offset roller cone bits with a bottom hole

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