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international conference on computational and information sciences | 2010

A 3D FEM Methodology for Rock Breakage in Rotary-Percussive Drilling

Xiao Xiaohua; Zhu Haiyan; Liu Qingyou; Fan Yongtao; Wang Degui; Chen Bo

In order to reveal the rock breaking mechanism of the rotary-percussive drilling, considering the coupling effect of the static pressure, impact force and rotary cutting and using the finite element methods (FEM), a three-dimensional (3D) insert-rock mutual action model is established. We use a Mohr-Coulomb type material model to describe when and how rock fails, and a triangular wave to replace the stress wave. Using the finite element analysis software (ANSYS), the 3D contact analysis of the insert and rock under percussion and rotary-percussion is carried out respectively. Considering the inclined plane angle (α) of the bit end face as 0° (vertical impaction), 20°, 25°, 30°, 35°, 40° and 45° (inclined impaction), the stresses of the insert with percussive drilling and rotary-percussive drilling are calculated respectively. The results show that: the torsional shear stress causes volume breaking, tensile stress accelerates the crack extension and volume rock breaking, while the compressive stress contributes as a secondary factor for the rock breaking, 30°, 35° and 40° are the preferred angle for the flat bit with single inclined plane, and the combination angle of 20°-40° is preferred for the flat bit with double inclined planes. The results of the 3D contact analysis are further calibrated with a series of field applications and research results.


Archive | 2013

Pressure drilling device for a drill stem and a using method thereof

Liu Qingyou; Yan Yongfa; Wang Guorong; Lin Faquan; Wang Yunhai; Liu Dandan


Archive | 2012

Novel floating ball type slurry outlet flow detection meter

Xie Chong; Cheng Junfeng; Liu Qingyou; Wang Guorong


Archive | 2016

Pipeline robot capable of active steering

Liu Qingyou; Luo Xu; Zhu Haiyan


Archive | 2016

Intelligent switch valve for reservoir improvement, production monitor and control

Chen Gui; Liu Qingyou; Zhu Haiyan; Zheng Wei; Yang Yaqiang


Archive | 2015

Drilling and completion and production increasing system for shale gas reservoir of multilateral fishbone horizontal well

Liu Qingyou; Tao Lei; Zhu Haiyan


Archive | 2012

Novel slurry outlet flow detection meter

Liu Qingyou; Cheng Junfeng; Wang Guorong; Xie Chong


Archive | 2016

Intelligent switching valve for reservoir reformation and production monitoring and control and construction method thereof

Zhu Haiyan; Zheng Wei; Liu Qingyou; Chen Gui; Yang Yaqiang


Archive | 2016

Construction method for reservoir transformation, production monitoring and control

Zhu Haiyan; Liu Qingyou; Chen Gui; Zheng Wei; Yang Yaqiang


Archive | 2015

Shale compressibility comprehensive evaluation method based on uniaxial strength experiment

Zhu Haiyan; Tao Lei; Liu Qingyou

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