Results 1 to 10 of about 29,446 (99)

Experimental study on shale-breaking of special-shaped cutter PDC bit

Geomechanics and Geophysics for Geo-Energy and Geo-Resources
To enhance the drilling efficiency and extend the service life of PDC (Polycrystalline Diamond Composite) bits in shale formations, this study delves into the rock-breaking mechanisms of special-shaped cutters through a comprehensive experimental ...
Chunliang Zhang, Xin Yang, Zhaoliang Zhu, Xiaohua Ke, Zhaofeng Zhang, Hua Luo, Yong Ma, Dongdong Song   +7 more
doaj   +3 more sources

Research on the rock-breaking mechanism and key factors influencing ROP enhancement during marble cutting with special-shaped PDC cutters

Journal of Petroleum Exploration and Production Technology
To improve the understanding of key drilling parameters affecting the efficiency of the shaped polycrystalline diamond compact (PDC) bits during drilling operations in marble formations, this study conducted experimental investigations to explore the ...
Hongbo Zhao, Tao Liang, Haixia Wu, Lina Shen, Zhijian Liu, Chun Li   +5 more
doaj   +3 more sources

Cutting mechanism of a special 3D concave-shaped PDC cutter applicable to the Weiyuan shale

Journal of Petroleum Exploration and Production Technology, 2023
The Weiyuan shale gas field faces problems of long drilling cycles and high development costs. Improving the drilling efficiency of polycrystalline diamond compact bits in shale formations will significantly reduce the overall well cost and duration ...
Xiaohua Ke, Jinsheng Sun, Xiongwen Yang, Chi Ma, Jiaqing Yu, Kuiling Huang   +5 more
doaj   +2 more sources

Study on rock breaking efficiency of special shaped cutters

IOP Conference Series: Earth and Environmental Science, 2022
Abstract The optimization of cutter shape has become one of the main innovation direction of PDC bit technology. At present, both domestic and foreign bit manufacturers have put forward various special shaped cutters to improve rock breaking efficiency.
Qi Peng, Yingcao Zhou, Jiaqing Yu, Xiongwen Yang, Yu Liu, Chi Ma, Chris Cheng, Xiaohua Ke   +7 more
openaire   +2 more sources

Simulation and Experimental Study on Rock Disintegration Characteristics of Special-shaped PDC Cutters

Gazi University Journal of Science, 2023
In order to analyze the rock disintegration characteristics of special-shaped Polycrystalline Diamond Compact (PDC) cutters, numerical simulation and micro-drilling test on four kinds of special-shaped PDC cutters are carried out. Simulation results show that, the surface stress of each PDC cutter is quite different.
Pei JU, Dongzhuang TİAN, Hongjie TİAN
openaire   +3 more sources

A Method for Evaluating the Rock Breaking Efficiency of Cutters and Optimizing the PDC Cutter Profile—A Study of Igneous Rock Formations in Shunbei Oilfield

Energies, 2022
The Permian igneous rock in Shunbei Oilfield exhibits high rock strength, which results in a low rate of penetration (ROP) and shortens the cutter’s service life. It is necessary to analyze and evaluate the rock breaking effect of cutters.
Zhuoxin Dong, Hui Zhang, Jun Li, Kuangsheng Zhang, Yangyong Ou, Zongyu Lu, Jiangang Shi   +6 more
doaj   +2 more sources

A Safe and Simple Method for Minimally Invasive Harvesting of the Partial-Thickness Quadriceps Tendon-Bone Autograft [PDF]

Arthroscopy Techniques
Good long-term postoperative clinical results can be achieved after anterior cruciate ligament reconstruction using the quadriceps tendon (QT) as the graft.
Daisuke Kubota, M.D., Hiroteru Hayashi, M.D., Ph.D., Eitaku Koh, M.D., Tomohiro Kayama, M.D., Ph.D., M.B.B.S., B.Sc., Toshiyuki Omori, M.D., Teruyuki Miyasaka, M.D., Ph.D., Taiki Neyatani, M.D., Mitsuru Saito, M.D., Ph.D.   +7 more
doaj   +2 more sources

Calculation of the producing surfaces of milling cutters for processing gears of eccentric-cycloidal engagement [PDF]

E3S Web of Conferences
The paper considers a new method for processing curved gears of eccentric-cycloidal engagement with a curved profile using a special tool. The surfaces of wheels of eccentric-cycloidal engagement with a curved profile for small and large wheels are ...
Kuts Vadim, Malneva Julia
doaj   +2 more sources

Numerical Simulation on Cutting and Breaking of Heterogeneous Conglomerate by Special-Shaped PDC Cutter

Shiyou jixie
When the PDC bit is used to drill conglomerate formations， the frequent impact loads reduce the expected life of PDC cutter， leading to frequent bit changes and ultimately affecting drilling efficiency.
Shi Jiangang, Li Gensheng, Liu Weiji, Wu Desheng, Zhang Nan, Deng Kaichuang   +5 more
doaj   +2 more sources

Cutting of Siliceous Dolomite by Special-Shaped PDC Cutter under Confining Pressure

Shiyou jixie
The dolomite formation is an important field for oil and gas exploration in the future. However， due to the high confining pressure environment in wellbore and the hard-to-drill characteristics of dolomite， traditional planar cutter PDC bit is prone to ...
Tian Wanqing, Liu Weiji, Qin Dehong, Liu Chenglong, Wang Haitao, Hu Hai   +5 more
doaj   +2 more sources