Results 81 to 90 of about 2,300 (225)

PDC Drill Bit Design Improvement using Reverse Engineering Method to Analyze Effect on Rate of Penetration [PDF]

, 2013
In the petroleum industry, drilling is one of the most important aspects due to the economics. Reduction in drilling time is required to minimize the cost of operations.
Ismail, Mohamad Zamri
core   +2 more sources

f‐Block Element‐Based MOF Thin Films: A Platform for Luminescence, Sensing, and Energy Applications

Small, EarlyView.
f‐Block element–based metal–organic framework (f‐MOF) thin films offer exceptional potential for luminescent, sensing, and energy‐related applications. This review surveys recent progress in their synthesis, characterization, and functional implementation, emphasizing the diversity of available thin‐film fabrication strategies. The convergence of these
Dong‐Hui Chen, Christof Wöll
wiley   +1 more source

Numerical Simulation on Rock-Breaking Performance of Prismatic PDC Cutter

Shiyou jixie
Conventional PDC bit exhibits severe wear,difficult penetration and low rate of penetration(ROP)in abrasive formations.Prismatic PDC cutter is superior to conventional planar PDC cutter in rock-breaking performance,but there is a lack of basis for the ...
Cheng Wei, Xing Xuesong, Lou Yishan, Zhu Liang, Yin Biao   +4 more
doaj  

Інтелектуальна підтримка прийняття рішень для управління відпрацюванням алмазних доліт [PDF]

, 2014
Розглядається можливість удосконалення методів підтримки прийняття рішень при управлінні відпрацюванням алмазних доліт в процесі буріння нафтових і газових свердловин шляхом дослідження та застосування динамічного інтелектуального аналізу інформативних ...
Семенцов, Г. Н., Чигур, Л. Я.   +1 more
core  

Dose‐Dependent Effects of Simulated Clinical Radiotherapy on the Structure and Properties of Root Dentine

Australian Endodontic Journal, EarlyView.
ABSTRACT Head and neck radiotherapy (HNRT) can expose teeth to moderate radiation doses, yet the effects on root dentine under clinically relevant conditions remain unclear. This in vitro study compared dentine subjected to 0, 30, or 50 Gy IMRT. Palatal roots from 35 maxillary molars were allocated to non‐irradiated, 30 Gy (oropharyngeal simulation ...
Anna Victória Costa Serique, Lívia Ribeiro, Julia Menezes Savaris, Luíz Carlos de Lima Dias‐Júnior, Eduardo Antunes Bortoluzzi, Mariana Comparotto Minamisako, Paulo Marcelo Rodrigues, Nayara Cardoso Cábia, Ricardo Machado, Bruno Alexandre Pacheco de Castro Henriques, Cleonice da Silveira Teixeira, Lucas da Fonseca Roberti Garcia   +11 more
wiley   +1 more source

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  

Elaboration de gradients de composition continue dans des taillants PDC

, 2006
International audienceCemented carbides are composites which possess an excellent compromise between hardness and toughness. For years, to improve one property without decreasing the other one, the concept of graduated structure was widely studied.
Colin, Christophe, Dourfaye, Alfazazi, Sellami, Hedi, Sorlier, Elodie   +3 more
core   +1 more source

MyD88 Deficiency Protects Mice From Experimental Autoimmune Encephalomyelitis by Influencing Both Dendritic Cells and T Cells

Immunology, EarlyView.
This study investigates the role of MyD88 in dendritic cells (DCs) and T cells during experimental autoimmune encephalomyelitis (EAE). We found that MyD88 is highly expressed in DCs and CD4+ T cells in people with multiple sclerosis, and its deficiency impairs DC maturation, reduces pro‐inflammatory cytokine production, weakens DC–T cell interactions ...
Wen Si, Gaochen Zhu, Qianling Jiang, Xin Ma, Guan Yang   +4 more
wiley   +1 more source

Customized Design and Application of High ROP Bit for Deep Shale Gas

Shiyou jixie
As the development scale of shale gas expands， improving the rate of penetration （ROP） of deep shale gas has become the key to improving development efficiency， and designing more targeted bit based on formation characteristics is an effective means to ...
Zhu Xiaohua, Deng Kaichuang, Liu Weiji, Li Ke, Li Yuanjun, Chen Wei, Yan Juntao   +6 more
doaj   +3 more sources

Evaluation of drilling parameters of a PDC bit [PDF]

, 1998
A drilling model for PDC bit is presented herein within steady bit advance hypothesis, with taking into account influence of wear and its evolution. First, friction mechanism on cutter wear flats, is studied by experimental and numerical approach.
Bergues, J., Geoffroy, H., Maitournam, Habibou, Nguyen Minh, D., Putot, C.   +4 more
core   +5 more sources