Results 11 to 20 of about 14,166 (227)
Evaluation of drilling parameters of a PDC bit [PDF]
International Journal of Rock Mechanics and Mining Sciences, 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. It is shown to correspond to a relationship between the normal applied pressure to the cutter wear flat ...
D.Nguyen Minh +3 more
openaire +3 more sources
Oil & Gas Science and Technology, 2021 The single-cone bit has become the first choice for slim hole sidetracking and deep well drilling with its unique rock breaking method and high ROP (Rate Of Penetration), with its main failure mode being of early excessive wear of the cutting teeth.
Kong Chunyan +3 more
doaj +1 more source
Implementation of two-party protocols in the noisy-storage model [PDF]
, 2010 The noisy-storage model allows the implementation of secure two-party protocols under the sole assumption that no large-scale reliable quantum storage is available to the cheating party.
B. Qi +18 more
core +3 more sources
Technique of PDC Bit Complexity Identification While Drilling Based on Surface Data
Shiyou jixie, 2022 Identification of downhole PDC bit complexities is one of the main challenges in drilling.Accurate identification of PDC bit complexities such as bit wear and stick-slip vibration is of great significance for improving drilling efficiency and defining ...
Chen Changchang +5 more
doaj
Polarization Entanglement Purification using Spatial Entanglement [PDF]
, 2001 Parametric down-conversion can produce photons that are entangled both in polarization and in space. Here we show how the spatial entanglement can be used to purify the polarization entanglement using only linear optical elements. Spatial entanglement as
Pan, Jian-Wei, Simon, Christoph
core +2 more sources
A study on PDC drill bits quality [PDF]
Wear, 2013 The quality of innovating PDC (Polycrystalline Diamond Compact) bits materials needs to be determined with accuracy by measuring cutting efficiency and wear rate, both related to the overall mechanical properties. An original approach is developed to encompass cutting efficiency and wear contribution to the overall sample quality.
Yahiaoui, Malik +4 more
openaire +3 more sources
The Wear Analysis Model of Drill Bit Cutting Element with Torsion Vibration
Advances in Mechanical Engineering, 2015 Due to some deficiencies in the existing researches of cutting element wear of polycrystalline diamond compact (PDC) drill bit and to reduce the wear rate of cutting element of PDC bit, accurately illustrate the effect of tooth-distributing angle on ...
Jialin Tian +7 more
doaj +1 more source
Performance evaluation of MPLS-enabled communications infrastructure for wide area monitoring systems [PDF]
, 2015 In order to obtain the transient power system measurement information, Wide Area Monitoring Systems (WAMS) should be able to collect Phasor Measurement Unit (PMU) data in a timely manner.
Ashton, PM +3 more
core +1 more source
, 2015 We develop a theory for long-distance quantum key distribution based on concatenated entanglement swapping using parametric down-conversion sources and show numerical results of our model.
Khalique, Aeysha, Sanders, Barry C.
core +1 more source
Conditional beam splitting attack on quantum key distribution [PDF]
, 2001 We present a novel attack on quantum key distribution based on the idea of adaptive absorption [calsam01]. The conditional beam splitting attack is shown to be much more efficient than the conventional beam spitting attack, achieving a performance ...
B. Huttner +14 more
core +2 more sources