利用充液管状波导结构刻度声速测井仪器的理论方法及实验研究

行业标准的声波测井刻度井建造是目前国内外石油行业迫切需要解决的实际问题，是标定和刻度新研发声波测井仪器的基础，也是国际性难题。它的建立对声波测井仪器的行业刻度标准及声速测井量值传递体系的建立具有十分重要的实际意义，其相关的理论研究也具有重要的学术价值。.本项目拟通过理论和实验研究圆形或异形截面的壁厚有限的管柱状声波导问题，研究这类波导中的声场传播规律，掌握不同模式波的频散特征，分析管内流体柱和柱壳之间的声能量耦合关系；参照现有声速测井仪的设计原理，研究不同频段声速测井仪的刻度方法，建立壁厚有限的管状声波导材料声速和观测到的视声速之间的定量关系，形成测井声速量值标定刻度井的设计原理和方案，并探索利用异形管材声波导结构建立声波测井各向异性标定环境的可行性。通过上述研究，为构建行业标准的声速刻度井奠定坚实的物理基础，并逐步形成一套行业标准声速测井量值刻度和传递的技术规范提供基础资料和技术支撑。

Presently, there is a pressing need to construct some standard scale pits for calibrating acoustic log tools in petroleum industry. The construction of the pits is an international challenge, but is very important during the foundation course of industry standard for calibrating acoustilog tool and of value delivery system of acoustilog velocity. The related theoretical results also have important academic value. .The propagation law of the acoustic fields and the dispersive characteristic of normal modes in the fluid-filled cylindrical shell waveguide with circular and/or noncircular cross section will be studied theoretically and experimentally. The acoustic energy coupling relation between the liquid cylinder and the cylindrical shell will be analysed. According to the design of the present acoustic velocity log tool, the calibrating method will be proposed in different frequency range, and the quantitative relation between the acoustic velocity of the cylindrical shell and the apparent velocity will be established. The design principle and scheme of the scale pit for calibrating acoustilog tool will be developed. The feasibility of constructing anisotropy-calibrated environment will be probed into for multipole array acoustilog tool using cylindrical pipe waveguide with noncircular cross section. Based on the above studies, the substantial physical foundation will be established to construct the standard acoustic velocity scale pits, and the fundamental data and enabling technology will be supplied to develop gradually a criterion of value calibration-delivery system of acoustilog velocity in petroleum industry.