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The application of modified isochronal well test in a low-permeability condensate gas field
Zhaojing Zhou,Xiuwei Wang,Xue Miao,Kangning Qian,Lijian Li,Peng Xu,Xiuqin Lu 한국자원공학회 2019 Geosystem engineering Vol.22 No.6
The modified isochronal well test is a deliverability test method suitable for gas wells in low-permeability gas reservoirs. Generally, the absolute open flow of gas wells is determined by modified isochronal well test, thereby establishing a reasonable working system for gas wells. It is also possible to obtain gas layer physical parameters, gas reservoir engineering parameters, heterogeneity, boundary characteristics, etc. In this paper, the actual test data of a condensate gas field are applied. By modified isochronal well test analysis, not only the deliverability equation of the gas well is obtained, but also the absolute open flow is determined. At the same time, the formation parameters such as reservoir permeability and skin factor are obtained and the acidification effect is evaluated.
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Image Denoising Based on Adaptive Fractional Order Anisotropic Diffusion
( Jimin Yu ),( Lijian Tan ),( Shangbo Zhou ),( Liping Wang ),( Chaomei Wang ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.1
Recently, the method based on fractional order partial differential equation has been used in image processing. Usually, the optional order of fractional differentiation is determined by a lot of experiments. In this paper, a denoising model is proposed based on adaptive fractional order anisotropic diffusion. In the proposed model, the complexity of the local image texture is reflected by the local variance, and the order of the fractional differentiation is determined adaptively. In the process of the adaptive fractional order model, the discrete Fourier transform is applied to compute the fractional order difference as well as the dynamic evolution process. Experimental results show that the peak signal-to-noise ratio (PSNR) and structural similarity index measurement (SSIM) of the proposed image denoising algorithm is better than that of other some algorithms. The proposed algorithm not only can keep the detailed image information and edge information, but also obtain a good visual effect.
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Chuan He,Yongqian Wu,Erping Deng,Yawen Zhou,Zhu Zhang,Lijian Ding 한국고분자학회 2024 폴리머 Vol.48 No.1
Dielectric barrier discharge (DBD) is a commonly used plasma surface modification technique, and the power parameters play a crucial role in influencing the modification results. Electrical properties of DBD pulses were studied by varying both power and frequency. Additionally, how these electrical properties influence the chemical and topographical alterations in polyethylene surface modification was investigated. In terms of chemical changes, we found that higher power supply significantly enhances the modification result, whereas alterations in frequency do not exert a substantial impact. Concerning topographical changes, increased power supply yielded similarly effective results, while heightened supply frequency improved the modification result due to the enhanced uniformity of discharge pulses. Regarding hydrophobicity, power supply exerts a more significant and pronounced influence compared to frequency.
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Jing Ji,Zhichao Xu,Liangqin Jiang,Chaoqing Yuan,Yunfeng Zhang,Lijian Zhou,Shilong Zhang 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.4
This paper was concerned with the nonlinear analysis on the overall stability of H-type honeycombed composite column with rectangular concrete-fi lled steel tube fl anges (STHCC). The nonlinear analysis was performed using ABAQUS, a commercially available fi nite element (FE) program. Nonlinear buckling analysis was carried out by inducing the fi rst buckling mode shape of the hinged column to the model as the initial imperfection with imperfection amplitude value of L /1000 and importing the simplifi ed constitutive model of steel and nonlinear constitutive model of concrete considering hoop eff ect. Close agreement was shown between the experimental results of 17 concrete-fi lled steel tube (CFST) specimens and 4 I-beams with top fl anges of rectangular concrete-fi lled steel tube (CFSFB) specimens conducted by former researchers and the predicted results, verifying the correctness of the method of FE analysis. Then, the FE models of 30 STHCC columns were established to investigate the infl uences of the concrete strength grade, the nominal slenderness ratio, the hoop coeffi cient and the fl ange width on the nonlinear stability capacity of SHTCC column. It was found that the hoop coeffi cient and the nominal slenderness ratio aff ected the nonlinear stability capacity more signifi cantly. Based on the results of parameter analysis, a formula was proposed to predict the nonlinear stability capacity of STHCC column which laid the foundation of the application of STHCC column in practical engineering.
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