Results 101 to 110 of about 14,166 (227)

TESS Data Release Notes: Sector 18 DR25 [PDF]

This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 18 observations made with the TESS spacecraft and cameras as a means to document instrument performance and ...
Burke, Christopher J., Caldwell, Douglas A., Doty, John, Fausnaugh, Michael M., Jenkins, Jon M., Smith, Jeffrey C., Ting, Eric B., Twicken, Joseph D., Vanderspek, Roland, Villesenor, Joel S.   +9 more
core   +1 more source

Impact of Rock Cuttings on Downhole Fluid Movement in Polycrystalline Diamond Compact (PDC) Bits, Computational Fluid Dynamics, Simulation, and Optimization of Hydraulic Structures

Fluids
The flow occurring at the bottom of a polycrystalline diamond compact (PDC) drill bit involves a complex process made up of drilling fluid and the drilled rock cuttings.
Lihong Wei, Jaime Honra
doaj   +1 more source

Field Test of Torsion Impactorin Well Jinyue 7-1

Shiyou jixie, 2017
To address the issues of deep well drillingin China like low ROP and high cost, it is necessary to suppress the influence of "stick-slip vibration" on PDC bit.
Li Wei, Sun Wenfeng, Yan Tie, Chen Shichun, Li Yue   +4 more
doaj  

TESS Data Release Notes: Sector 9 DR11 [PDF]

This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 9 observations made with the TESS spacecraft and cameras as a means to document instrument performance and data
Burke, Christopher J., Caldwell, Douglas A., Doty, John P., Fausnaugh, Michael M., Jenkins, Jon M., Smith, Jeffrey C., Ting, Eric B., Twicken, Joseph D., Vanderspek, Roland, Villesenor, Joel S.   +9 more
core   +1 more source

Numerical Simulation of Downhole Particle Flow in Horizontal Well with PDC Bit

Shiyou jixie, 2019
In the deep shale gas horizontal well drilling, the low cutting carrying efficiency often lead to the problem of bit ball. To address the problem, the CFD-DEM coupling method is used to simulate the horizontal well flow field between PDC bit and ...
Kuang Yuchun, Zhang Rui, Luo Jinwu, Zhu Guanghui   +3 more
doaj  

TESS Data Release Notes: Sector 20, DR27 [PDF]

This release note discusses the science data products produced by the Science Processing Operations Center at Ames Research Center from Sector 20 observations made with the TESS spacecraft and cameras as a means to document instrument performance and ...
Burke, Christopher J., Caldwell, Douglas A., Doty, John P., Fausnaugh, Michael M., Jenkins, Jon M., Smith, Jeffrey C., Ting, Eric B., Twicken, Joseph D., Vanderspek, Roland, Villesenor, Joel S.   +9 more
core   +1 more source

Laboratory Experimental Study on Rock Breaking Efficiency and Stability of PDC Bit

Shiyou jixie, 2020
In order to evaluate the rock breaking efficiency and stability of the newly developed PDC bit in the target lithologic formation, and guide the optimization, improvement and efficient use of the newly developed PDC bit, full scale laboratory rock ...
Zhang Jiawei, Meng Zhao, Ji Guodong, Cui Meng, Wang Haige, Yang Xiongwen, Yu Lianjie   +6 more
doaj  

Rock Breaking Simulation and Optimization of PDC Bit for Jimsar Shale Formation

Shiyou jixie
Conventional planar-cutter PDC bit exhibits prominent problems in drilling， such as severe wear， frequent cutter breakage and short footage， resulting in low drilling efficiency and high cost. To improve the drilling speed and reduce the drilling cost in
Zang Chuanzhen
doaj   +1 more source

Review on qudits production and their application to Quantum Communication and Studies on Local Realism

, 2007
The codification in higher dimensional Hilbert Spaces (whose logical basis states are dubbed qudits in analogy with bidimensional qubits) presents various advantages both for Quantum Information applications and for studies on Foundations of Quantum ...
Genovese, Marco, Traina, Paolo
core  

Study on the Bottom Hole Flow Field Analysis Platform of PDC Bit

Shiyou jixie, 2017
The conventional numerical simulation of hydraulic performance of the bottom hole flow field of PDC bit has the shortcomings like high threshold, time-consuming and repetitive work.
Kuang Yuchun, Wang Fang, Wei Lihong, Dong Zongzheng, Luo Jinwu   +4 more
doaj