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| 1 | An acoustic-wave theory for casing bond evaluation using viscoelastic slip boundary modeling显示文摘Slip boundary condition is commonly utilized to model elastic wave propagation through layered earth media. The same approach is used here to characterize acoustic wave propagation along a cased borehole with various cement bond conditions. By modeling the cement layer between casing and formation as a viscoelastic slip interface with complex coupling rigidity parameters, one can not only reduce the complexity in the classical elastic wave modeling of the problem, but also efficiently model various complicated wave phenomena that are difficult for the existing modeling. More specifically, the new theory can well describe the effect of the cement bond condition change and the location of the change(i.e., whether it is in the first interface between casing and cement, or the second interface between cement and formation) on the acoustic waves,demonstrating the good modeling capability and predicting power. Application of the theory to field data shows that the theory can correctly model the acoustic wave characteristics and interpret the cement bond condition, thus providing a useful fundament theory for casing bond evaluation using acoustic logging. | Xiaoming TANG Can JIANG YuANDa SU Xuelian CHEN | 2018 | Science China Earth Sciences2018，61，8： | 4 |
| 2 | Dynamic fluid transport property of hydraulic fractures and its evaluation using acoustic logging显示文摘The existing acoustic logging methods for evaluating the hydraulic fracturing effectiveness usually use the fracture density to evaluate the fracture volume, and the results often cannot accurately reflect the actual productivity. This paper studies the dynamic fluid flow through hydraulic fractures and its effect on borehole acoustic waves. Firstly, based on the fractal characteristics of fractures observed in hydraulic fracturing experiments, a permeability model of complex fracture network is established. Combining the dynamic fluid flow response of the model with the Biot-Rosenbaum theory that describes the acoustic wave propagation in permeable formations, the influence of hydraulic fractures on the velocity dispersion of borehole Stoneley-wave is then calculated and analyzed, whereby a novel hydraulic fracture fluid transport property evaluation method is proposed. The results show that the Stoneley-wave velocity dispersion characteristics caused by complex fractures can be equivalent to those of the plane fracture model, provided that the average permeability of the complex fracture model is equal to the permeability of the plane fracture. In addition, for fractures under high-permeability(fracture width 10~100 μm, permeability ~100 μm^(2)) and reduced permeability(1~10 μm, ~10 μm^(2), as in fracture closure) conditions, the Stoneley-wave velocity dispersion characteristics are significantly different. The field application shows that this fluid transport property evaluation method is practical to assess the permeability and the connectivity of hydraulic fractures. | LI Huanran TANG Xiaoming LI Shengqing SU Yuanda | 2022 | Petroleum Exploration and Development2022，49，1： | 0 |
| 3 | A cased-hole acoustic logging technique using the dual source of opposite polarity显示文摘It is usually difficult to measure acoustic velocities through a casing,especially when the casing is poorly bonded with formation.An acoustic logging technique using the dual source of opposite polarity is proposed to enhance the Signal to Noise Ratio of the formation signal and to reduce the casing wave in the data acquisition process.In what follows,a theoretical modeling is used to caculate the wavefroms of cased wells.And then,a scaled experiment was conducted in the 1:10 scaled experimental well using the proposed technique in the poorlybonded condition.The results show that this technique can effectively suppress the casing wave and enhance the formation wave,even in the poorly-bonded condition.By analyzing the measured wavefroms,the amplitude of casing wave is reduced to 12%compared to the conventional one-source technique,and the compressional wave velocity can be easily obtained by using this technique.Both the theoretical modeling and experiment results demonstrate the feasibility of the proposed technique.This study establishes the theoretical and experimental foundation for the cased-hole,dual source of opposite polarity,acoustic logging tool development. | ZHANG Bo SU Yuanda Tang Xiaoming QI Xiao TAN Baohai | 2015 | Chinese Journal of Acoustics2015，34，3： | 0 |
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