Using the ellips-parabolid log model with the four practical measurable parameters, the exact volume of allthe uncut-boars and clabs cut by the multi-bit ripping edger has been measured. The kerf lossing and recovery ...Using the ellips-parabolid log model with the four practical measurable parameters, the exact volume of allthe uncut-boars and clabs cut by the multi-bit ripping edger has been measured. The kerf lossing and recovery have beenaccurately calculated. By the theories, a quite simple NC detecting system of the multi-bit ripping edger will be designed,which makes the numerical control of processing timber industry of Small logs realizable.展开更多
During surveys, water layers may interfere with the detection of oil layers. In order to distinguish between oil and water layers in a porous cracked medium, research on the properties of cracks and oil and water laye...During surveys, water layers may interfere with the detection of oil layers. In order to distinguish between oil and water layers in a porous cracked medium, research on the properties of cracks and oil and water layers and their relation to acoustic logging rules is essential. On the basis of Hudson＇s crack theory, we simulated oil and water layers in crack-porous medium with different crack parameters corresponding to the well-field response. We found that in a cracked medium with high crack angle or low number density of cracks, compressional and shear wave velocities are sensitive to crack characteristics; further, these velocities are more sensitive to crack characteristics when the waves propagate through the water layer than when they propagate through the oil layer. Compressional and shear wave velocities increase with an increase in crack angle： in the water layer, the increase is approximately linear. On comparing the full waveforms observed in the oil and water layers, we find that the amplitudes of most waves are higher in the water layer. Among the considered waves, the Stoneley wave suffers maximum amplitude attenuation in the oil layer. The maximum excitation intensity for oil layer is greater than that for the water layer. These results can guide further cracked media logging field exploration work.展开更多
文摘Using the ellips-parabolid log model with the four practical measurable parameters, the exact volume of allthe uncut-boars and clabs cut by the multi-bit ripping edger has been measured. The kerf lossing and recovery have beenaccurately calculated. By the theories, a quite simple NC detecting system of the multi-bit ripping edger will be designed,which makes the numerical control of processing timber industry of Small logs realizable.
基金supported by the National Natural Science Foundation of China(No.40874059)the Doctoral Scientific Research Foundation of East China University of Technology(Nos.DHBK2015315,DHBK2015316)
文摘During surveys, water layers may interfere with the detection of oil layers. In order to distinguish between oil and water layers in a porous cracked medium, research on the properties of cracks and oil and water layers and their relation to acoustic logging rules is essential. On the basis of Hudson＇s crack theory, we simulated oil and water layers in crack-porous medium with different crack parameters corresponding to the well-field response. We found that in a cracked medium with high crack angle or low number density of cracks, compressional and shear wave velocities are sensitive to crack characteristics; further, these velocities are more sensitive to crack characteristics when the waves propagate through the water layer than when they propagate through the oil layer. Compressional and shear wave velocities increase with an increase in crack angle： in the water layer, the increase is approximately linear. On comparing the full waveforms observed in the oil and water layers, we find that the amplitudes of most waves are higher in the water layer. Among the considered waves, the Stoneley wave suffers maximum amplitude attenuation in the oil layer. The maximum excitation intensity for oil layer is greater than that for the water layer. These results can guide further cracked media logging field exploration work.
