一种小型化自适应方位电磁波电阻率测井仪系统设计

Design of a Miniaturized Adaptive Azimuthal Electromagnetic Wave Resistivity Logging Instrument System

摘要: 本文针对方位电磁波电阻率测井仪系统展开研究，旨在设计一种环境适应性强、结构小型的方位电阻率检测系统。该系统由钻铤结构、天线和电路组成，能够精确反映地层界面变化。充分利用结构空间，将各电路安装槽位于各天线之间，使得方位电阻率短节长度大大缩短，可进行近钻头方位电阻率测量应用，从而有效提高地质导向效果。对发射机功率采取可调设计，利用接收信号的大小作为反馈，对发射功率进行调节，从而具有更强的环境适应性，提高测量精度。同样地，接收电路也具有自动调整接收信号增益的自适应调节能力。经方位电磁波电阻率原理性系统测试，验证了所设计的电路、天线、算法的正确性。

Abstract: This paper focuses on the research of an azimuthal electromagnetic wave resistivity logging instrument system, aiming to design a strong environmental adaptability and compact azimuthal resistivity detection system. The system, composed of a drill collar structure, antennas, and electronic circuits, can accurately reflect changes in formation interfaces. By fully utilizing the structural space and placing the circuit installation slots between the antennas, the length of the azimuthal resistivity sub is significantly shortened. This allows for near-bit azimuthal resistivity measurement applications, thereby effectively enhancing geosteering performance. The transmitter power is designed to be adjustable; it is regulated using the magnitude of the received signal as feedback, which provides stronger environmental adaptability and improves measurement accuracy. Similarly, the receiving circuit also possesses adaptive control capabilities to automatically adjust the gain of the received signal. The correctness of the designed circuits, antennas, and algorithms has been verified through a proof-of-concept system test for the azimuthal electromagnetic wave resistivity instrument.