Results 11 to 20 of about 15,062 (254)
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 +6 more
doaj +1 more source
Investigation of the Cross-Cutting Polycrystalline Diamond Compact Bit Drilling Efficiency
Shock and Vibration, 2021 The parallel track scraping principle of conventional PDC bits largely limits the cutting efficiency and working life in deep formations. Cross-cutting polycrystalline diamond compact (PDC) bit may be an efficient drilling tool that increases the rock ...
Chun-Liang Zhang +5 more
doaj +1 more source
The Influence of Mixed Cutter Arrangement Parameters of PDC Bit on Rock Breaking
Shiyou jixie, 2020 To optimize the cutting structure of the mixed cutter arranged PDC bit and improve the rock breaking efficiency, an independent design test device was used to carry out the experimental research and numerical simulation on the influence of the cutter ...
Liu Zhong, Hu Wei, Yin Zhuo, Hou Huihui
doaj +1 more source
Geofluids, 2022 Polycrystalline diamond compact (PDC) bits experience a serious wear problem in drilling tight gravel layers. To achieve efficient drilling and prolong the bit service life, a simplified model of a PDC bit with double cutting teeth was established by ...
Li-qiang Wang +5 more
doaj +1 more source
Development and application of hobbing-cone hybrid PDC bit
Geomechanics and Geophysics for Geo-Energy and Geo-Resources, 2023 In order to solve the problems of low ROP and short service life of the bit drilling in deep and hard formation, a new technology of hobbing-cone hybrid PDC bit which has combined the advantages of conventional PDC bit and the hobbing-cone is proposed in
Lian Chen +7 more
doaj +1 more source
Approximate MIMO Iterative Processing with Adjustable Complexity Requirements [PDF]
, 2011 Targeting always the best achievable bit error rate (BER) performance in iterative receivers operating over multiple-input multiple-output (MIMO) channels may result in significant waste of resources, especially when the achievable BER is orders of ...
Gerd Ascheid +2 more
core +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
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
Bionic coupling polycrystalline diamond composite bit
Petroleum Exploration and Development, 2014 Bionic coupling polycrystalline diamond compact (PDC) was designed according to the biological coupling theory, its performance was evaluated by wear resistance experiment, and then the bionic coupling PDC bit was made and used in field drilling test ...
Ke GAO +5 more
doaj +1 more source
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