摘要
地层水的高导电性使得电磁波在同轴线传感器内传输时的衰减变大,甚至在同轴线的接收端无法接收到电磁波信号.建立了同轴线在多层介质条件下的数学模型,优化设计了同轴线内的介质结构.理论计算和实验结果表明:采用优化设计介质结构可减少同轴线内地层水的电导率对其等效电导率的贡献,同时还不影响地层水介电常数对等效介电常数的贡献,能够保证在同轴线的接收端接收到的电磁波信号具有足够大的强度.
Coaxial line sensor is the core of phase-based water cut meter in oil wells. The attenuation of electromagnetic wave will be too serious when transmitting in coaxial line is detected in the reception end of coaxial line because of the high conductivity of formation water. The structure of medium inside the coaxial line has been optimized and designed by establishing mathematic model of coaxial line under the condition of multi-layer medium. This structure of coaxial line inner medial has proved that it decreases the contribution that the conductivity of formation water inside the coaxial line imposes on its equivalent conductivity from heoretical calculation and experimental result. Simultaneously it doesn't affect the contribution that the permittivity of formation water imposes on its equivalent permittivity and can ensure that the signal of electromagnetic wave that receives from the reception end of coaxial line has enough intensity.
出处
《大庆石油学院学报》
CAS
北大核心
2005年第4期76-78,97,135,共5页
Journal of Daqing Petroleum Institute
关键词
含水率计
同轴线
传感器
优化设计
water cut tool
coaxial line
sensor
optimized design
