Auto-ignition and stabilization mechanism of diluted H2 jet flame

Thermal ionization is the main characteristic of long air gap breakdown. Using the thermal characteristics of the discharge channel can not only analyze the formation and development mechanism of the leader discharge but also better reflect the insulation recovery process of the discharge channel. The background oriented schlieren (BOS) technique is a method generally used for diagnosing flow fields. It can also be used to extract the gradient profile of the refractive index field in long-gap discharge channels, which can then be inverted to yield the temperature field. Based on the BOS, a 1-m rod–plate gap discharge observation system was built and the discharge test was carried out. By optimizing the refractive index reconstruction algorithm, a more accurate temperature field distribution of the discharge channel was obtained. By analyzing the evolution process of the discharge channel, the shock wave radius variation law and insulation recovery time of the channel were obtained, which had a guiding significance for the reclosing time setting.

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Characterization and Modelling of Multiscale Natural Fractures in Shale Reservoirs: A Case Study from a Block in the Southern Sichuan Basin

Gai¹,

Jia

Wei

et al. 2022

Geofluids

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Natural fractures are vital to the efficiencies of drilling and completion operation. The purpose of this paper is to characterize and model multiscale natural fractures in shale reservoirs. Based on the seismic and log responses, as well as outcrop and core observations, we divide natural fractures into Macro, Meso, and Micro three scales. Macroscale fractures are the faults picked directly in seismic profiles. Also, Mesoscale fractures are the natural fracture corridors analyzed by ant tracking technique in 3D seismic data. Furthermore, Microscale fractures are the fractures observed in imaging logs and cores. The fracture intensity is obtained by the correlation between ant tracking attributes and fracture density in borehole. The fracture aperture, dip, and azimuth are three main parameters, which are recognized by the loggings and cores. Stochastic modelling is applied to factures. We find that faults identified by the ant tracking result are excellent in line with Macroscale faults interpreted directly from seismic data. In addition, Mesoscale fractures are indicated from the ant tracking result, which are in accord with breakpoint in the well and in keeping with tectonic history of the area. Such high consistency indicates the ant tracking result is reliable. Moreover, image logs and cores reveal that it mainly develops high angle natural fractures and the fracture aperture is about 1 mm. The fracture strike includes three sets (NNW-SSE, NE-SW, and NNE-SSW). The distribution of the natural fractures in discrete fracture network (DFN) system is distributed controlled by the ant tracking result. Comparing the histograms of DFN results and fracture characterized by seismic and logging responses, as well as outcrop and core observation, it suggests that the major part of the observed natural fractures is retained into our DFN model.

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Auto-ignition and stabilization mechanism of diluted H2 jet flame

Abstract: " P r o g r e s s i n s a f e t y o f h y d r o g e n t e c h n o l o g i e s a n d i n f r a s t r u c t u r e : e n a b l i n g t h e t r a n s i t i o n t o z e r o c a r b o n e n e r g y " Monday,

Cited by 4 publications

References 17 publications

Reservoir Characteristics and Controlling Factors of the Metamorphic Buried Hill of Bozhong Sag, Bohai Bay Basin

Reservoir Characteristics and Controlling Factors of the Metamorphic Buried Hill of Bozhong Sag, Bohai Bay Basin

Measurement of discharge channel based on background oriented schlieren technique using an optimized algorithm

Characterization and Modelling of Multiscale Natural Fractures in Shale Reservoirs: A Case Study from a Block in the Southern Sichuan Basin

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