«Onshore and offshore oil and gas well construction»

Study of wells deviation in case of drilling them by diamond bits of different diamond grain sizes

UDC: 622.24.065
DOI: -

Authors:

¹ Siberian Federal University, Krasnoyarsk, Russia

Keywords: rock anisotropy, natural well curvature, diamond drill bit, grain size, axial force, overturning moment

Annotation:

Drilling wells in anisotropic rock formations causes significant wells deviations, significantly complicating the drilling process and requiring significant re-drilling costs if the geological specifications are not met. Furthermore, diamond drilling by complex systems equipped by a removable core receiver eliminates sharp borehole deviations that can occur when adjusting boreholes by whipstocks. Therefore, it is important to study the conditions and force factors that cause natural borehole deviations. The objective of the study is to investigate the influence of grain size, a design parameter of diamond drill bits, on the magnitude of the overturning moment that occurs during deformation and fracture of anisotropic rock. The analysis revealed that the use of fine-cutter and impregnated diamond bits reduced the overturning moment, which has a destabilizing effect on drilling tool performance. The greatest curvature reduction was achieved when using impregnated diamond bits with smaller diamond cutters when the axial force was reduced to the level that ensured effective rock fracture.

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