Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
3D Cutting Force Model of a Stinger PDC Cutter: Considering Confining Pressure and the Thermal Stress
Abstract Cutting force prediction of the Stinger PDC cutter is a critically important work for the hybrid PDC bit design, which will directly affect the working stability and rock-breaking efficiency of drill bits. Thermal stress caused by drilling fluid cooling high temperature rock has significant influence on cutting force in geothermal drilling. However, to our best knowledge, the investigation of thermal stress in cutting force models for Stinger PDC is still limited. This paper presents a 3D cutting force analytical model of a Stinger PDC cutter based on the rock stress analysis, which considers the comprehensive influences of in-situ stress, hydrostatic pressure, and thermal stress. The model accuracy is validated by experimental data with less than 7% error in atmosphere condition. The simulation results show that a spherical shape stress concentration zone around the Stinger PDC cutter tip is formed, where the rock is mainly subjected to tensile stress. With the increase of in-situ stress and hydrostatic pressure, the cutting force increases linearly, but the hydrostatic pressure has smaller influence on the cutting force than in-situ stress. The induced thermal stress belongs to tensile stress, which can sharply decrease the cutting force, and the amplitude of cutting force reduction reaches 74% at cutting depth of 1 mm when the formation temperature is 300 °C. In addition, the cutting force also reduces with the increase of the formation temperature and the heat transfer coefficient. The key findings of the work will be expected to help design the hybrid PDC bit used in geothermal drilling.
3D Cutting Force Model of a Stinger PDC Cutter: Considering Confining Pressure and the Thermal Stress
Abstract Cutting force prediction of the Stinger PDC cutter is a critically important work for the hybrid PDC bit design, which will directly affect the working stability and rock-breaking efficiency of drill bits. Thermal stress caused by drilling fluid cooling high temperature rock has significant influence on cutting force in geothermal drilling. However, to our best knowledge, the investigation of thermal stress in cutting force models for Stinger PDC is still limited. This paper presents a 3D cutting force analytical model of a Stinger PDC cutter based on the rock stress analysis, which considers the comprehensive influences of in-situ stress, hydrostatic pressure, and thermal stress. The model accuracy is validated by experimental data with less than 7% error in atmosphere condition. The simulation results show that a spherical shape stress concentration zone around the Stinger PDC cutter tip is formed, where the rock is mainly subjected to tensile stress. With the increase of in-situ stress and hydrostatic pressure, the cutting force increases linearly, but the hydrostatic pressure has smaller influence on the cutting force than in-situ stress. The induced thermal stress belongs to tensile stress, which can sharply decrease the cutting force, and the amplitude of cutting force reduction reaches 74% at cutting depth of 1 mm when the formation temperature is 300 °C. In addition, the cutting force also reduces with the increase of the formation temperature and the heat transfer coefficient. The key findings of the work will be expected to help design the hybrid PDC bit used in geothermal drilling.
3D Cutting Force Model of a Stinger PDC Cutter: Considering Confining Pressure and the Thermal Stress
Xiong, Chao (Autor:in) / Huang, Zhongwei (Autor:in) / Shi, Huaizhong (Autor:in) / Yang, Ruiyue (Autor:in) / Dai, Xianwei (Autor:in) / He, Wenhao (Autor:in)
2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
UH model for granular soils considering low confining pressure
| Springer Verlag | 2021
| British Library Online Contents | 2018