«Onshore and offshore oil and gas well construction»

Evaluation of the applicability of an alternative design of a drill bit cone movable joint

UDC: 622.24.051
DOI: 10.33285/0130-3872-2023-9(369)-41-45

Authors:

¹ Kuban State Technological University, Krasnodar, Russia

Keywords: thermo-elastic phase transformations, shape memory effect, pseudo-elasticity/super-elasticity, drill bitcone, drilling equipment, welded joints

Annotation:

The designs of rock cutting tools are being improved and complicated to increase the reliability resource and operational service life. The most applicable cone bits are a complex structure, the joints of which are constantly subjected to various types of loading. One of the main problems of ensuring the design reliability is associated with the use of a weld to fix the locking pin, which is one of the main connecting elements of drill bitcones, providing the possibility of a movable connection of the drill bit cone on the drill bit leg axle. In addition to general structural flaws, the welded joint is extremely poorly perceived by dynamic loads and vibrations, which are directly related to the rock drilling process. The solution of the proposed problem is supposed to be the use of an alloy with thermo-elastic phase transformations as the material of the locking pin with a change of the mounting method, which makes it possible to replace the welded joint fixation by the geometry fixation. It is achieved by applying the shape memory effect inherent in this class of smart materials. To confirm the proposed design effectiveness, a comparative strength analysis was carried out, which proved the advantages and suitability for use of the developed locking pin and mounting method.

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