Results 1 to 10 of about 4,781,571 (231)

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, Dongdong Song, Xiaohua Ke   +2 more
exaly   +3 more sources

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

Journal of Petroleum Exploration and Production, 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 ...
Jinsheng Sun, Xiaohua Ke
exaly   +2 more sources

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

Arthrosc Tech
Good long-term postoperative clinical results can be achieved after anterior cruciate ligament reconstruction using the quadriceps tendon (QT) as the graft.
Kubota D, Hayashi H, Koh E, Kayama T, Omori T, Miyasaka T, Neyatani T, Saito M.   +7 more
europepmc   +2 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   +1 more source

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   +3 more sources

Rock-Breaking Mechanism of Special-shaped PDC Cutter in Heterogeneous Granite

Shiyou jixie, 2022
In order to clarify the rock-breaking mechanism of special-shaped PDC cutter in the difficult-to-drill formations(e.g. granite), the finite element method was used to establish a mesoscopic heterogeneous granite model with different mineral components ...
Liu Hexing, Luo Yunxu, Liu Weiji, Ma Chuanhua, Wu Yanhui, Zhu Xiaohua, Liu Yaya   +6 more
doaj  

Simulation of machining of the working surface of wheel pairs on machine tools KZh20

Технічна інженерія, 2020
In mechanical engineering, there is a class of parts with a wheel pairs or with a curved working surface, such parts include wheel pairs of rail vehicles.
V.M. Ruban
doaj   +1 more source

Numerical Simulation Study on Rock Breaking Characteristics of Prismatic PDC Cutter under Triaxial Stress

Shiyou jixie, 2021
The research on rock breaking mechanism of special-shaped non-planar PDC cutter is relatively scarce, and the research on domestic prismatic PDC cutter is even scarcer.
Wei Xiuyan, He Wenhao, Shi Huaizhong, Chen Zhenliang, Xiong Chao, Li Shuowen   +5 more
doaj  

Experimental Study on Rock Breaking Effect of Axe-Shaped and Triangular-Ridged Cutters Under Impact Load

Shiyou jixie
In drilling engineering， optimized cutter selection for specific formations is critical to enhance rock breaking efficiency. To this end， a Split Hopkinson Pressure Bar （SHPB） apparatus was used to conduct impact-induced rock breaking tests of triangular-
Li Yunzhu, Liu Ronghe, Du Jianhong, Liu Bin, Wang Wenwen, XI Yan, Zhang Tianze   +6 more
doaj   +3 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   +3 more sources