A method to determine the strike of interface outside of borehole by monopole borehole acoustic reflections

Wang, Hua; Tao, Guo; Shang, Xuefeng

doi:10.1016/j.petrol.2015.05.025

Cited by 50 publications

(4 citation statements)

References 13 publications

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“…This is unexpected, as the stable low-temperature TiO 2 phase is anatase. The likely reasons for the formation of rutile are (i) the use of TiCl 4 as a precursor which is prone to produce rutile nanoparticles on hydrolysis and (ii) induction of epitaxial growth of rutile nanoparticles by the FTO support which has also a rutile crystal structure. The rutile nanoparticles formed via chemical bath deposition adhere very strongly to the FTO, and hence no further calcination or sintering step is required for the formation of the electron-selective TiO 2 contact.…”

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confidence: 99%

Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency

et al. 2014

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We demonstrate low-temperature (70 °C) solution processing of TiO2/CH3NH3PbI3 based solar cells, resulting in impressive power conversion efficiency (PCE) of 13.7%. Along with the high efficiency, a strikingly high open circuit potential (VOC) of 1110 mV was realized using this low-temperature chemical bath deposition approach. To the best of our knowledge, this is so far the highest VOC value for solution-processed TiO2/CH3NH3PbI3 solar cells. We deposited a nanocrystalline TiO2 (rutile) hole-blocking layer on a fluorine-doped tin oxide (FTO) conducting glass substrate via hydrolysis of TiCl4 at 70 °C, forming the electron selective contact with the photoactive CH3NH3PbI3 film. We find that the nanocrystalline rutile TiO2 achieves a much better performance than a planar TiO2 (anatase) film prepared by high-temperature spin coating of TiCl4, which produces a much lower PCE of 3.7%. We attribute this to the formation of an intimate junction of large interfacial area between the nanocrystalline rutile TiO2 and the CH3NH3PbI3 layer, which is much more effective in extracting photogenerated electrons than the planar anatase film. Since the complete fabrication of the solar cell is carried out below 100 °C, this method can be easily extended to plastic substrates.

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confidence: 99%

Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency

et al. 2014

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“…To avoid the interference of the borehole flexural wave being excited outside of the dominant frequency band, and guarantee that the excited dipole acoustic energy is concentrated on the dominant frequency band, the transducer exciting signals must be controllable and obtain a narrow frequency band (such as multicycle sine waves) [ 25 , 26 ]. On the other hand, reducing the acoustic excitation frequency will cause it to be closer to the frequencies of the drilling noise and drilling fluid cycle noise.…”

Section: Key Technologies Adopted In the Excitation Systemmentioning

confidence: 99%

Design of a New Acoustic Logging While Drilling Tool

Zhang

Tan

Zhang

et al. 2021

Sensors

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To obtain qualified logging while drilling (LWD) data, a new acoustic LWD tool was designed. Its overall design is introduced here, including the physical construction, electronic structure, and operation flowchart. Thereafter, core technologies adopted in this tool are presented, such as dominant exciting wave bands of dipole source, a sine wave pulse excitation circuit, broadband impedance matching, and an intellectualized active reception transducer. Lastly, we tested this tool in the azimuthal anisotropy module well, calibration well, and normal well, working in the model of the cable, sliding eye, and logging while drilling. Experiments showed that the core technologies achieved ideal results and that the LWD tool obtained qualified data.

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“…Fault sealing refers to the property that rocks in the hanging wall and foot wall prevent continuous migration of hydrocarbons and fluids due to differences in displacement pressure (Cao, Qin, Zhou, Cui, & Wu, 2021; Chen, 2015; Fu, Wang, & Li, 2017; Hu, Lv, Fu, Wang, & Liu, 2019; Li, Tian, He, Jia, & Zhang, 2018; Li & Gao, 2005). The fault sealing is basically composed of lateral fault sealing and vertical fault sealing based on sealing direction and capacity (Solum, Davatzes, & Loaner, 2010; Vrolijk, Urai, & Kettermann, 2016; Wang, Tao, & Shang, 2015; Wilson, Smithy, Povey, & Harris, 2020; Yielding, Bretan, & Freeman, 2010). Usually, lateral fault sealing turns out to be potential focus for significances and interests in reservoir mechanism (Childs et al, 2009; Fisher, Haneef, Grattoni, Allshorn, & Lorinczi, 2018; Giger, Ewy, Favero, Stankovic, & Keller, 2018).…”

Section: Introductionmentioning

confidence: 99%

The quantitative evaluation of fault sealing during the Cenozoic in Gaoyou Depression, Subei Basin

2022

Geological Journal

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The quantitative evaluation of fault sealing is conducted based on comprehensive analysis of mechanism and type analysis of fault seal, fault seal evaluation, and case study analysis. The results indicate that the properties of fault sealing are the interaction of fault order, net-to-gross ratio, fault activity, mud distribution on fault walls, fault dip, and buried depth. In addition, there are three types of fault sealing, including juxtaposition seal, fault rock seal, and cementation seal. Furthermore, the opening and closing of faults play an essential role in controlling hydrocarbon migration and accumulation. Finally, the fault sealing plays a controlling role in reservoir preservation.

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A method to determine the strike of interface outside of borehole by monopole borehole acoustic reflections

Cited by 50 publications

References 13 publications

Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency

Nanocrystalline Rutile Electron Extraction Layer Enables Low-Temperature Solution Processed Perovskite Photovoltaics with 13.7% Efficiency

Design of a New Acoustic Logging While Drilling Tool

The quantitative evaluation of fault sealing during the Cenozoic in Gaoyou Depression, Subei Basin

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