测井技术2025，Vol.49Issue(4)：557-564,8.DOI:10.16489/j.issn.1004-1338.2025.04.008
微电阻率扫描成像测井仪基于负载自适应的发射模块设计
Design of a Load-Adaptive Transmitter Module for Micro-Resistivity Scanning Imaging Logging Tool
摘要
Abstract
To address the insufficient adaptability of the transmitter module of the micro-resistivity scanning imaging logging tool under different well conditions,especially the insufficient emission current in high-resistivity drilling fluid environments which affects imaging quality,the method of theoretically analyzing the response characteristics of the transmitter module in downhole environments,constructing an equivalent circuit model,proposing a load-adaptive transmitter module design scheme,verifying its function through model simulation,and integrating it into a wide-dynamic micro-resistivity scanning imaging tool for actual downhole tests is adopted.The research results show that:①Compared with the traditional transmitter module,the applicable range of drilling fluid resistivity of this module is increased to 3 times the original,and the load adaptability is increased to 4 times the original.②In simulation tests,under 1,50 and 100 Ω load conditions,the module can work stably,with no distortion in the waveform at the load ends,and the switching tube shows good response.③Field tests show that in high-resistivity drilling fluid and high-resistivity formation environments,the module can provide sufficient emission current,significantly improving the resolution of logging images and enhancing the ability to identify fractures and thin layers.④It effectively solves the problem of insufficient emission current of traditional modules in high-resistivity environments and significantly improves the quality of logging data.It is concluded that the load-adaptive transmitter module significantly improves the adaptability and stability of the micro-resistivity scanning imaging logging tool under complex well conditions,providing a theoretical basis and design guidance for its research and development.关键词
微电阻率扫描成像测井仪/井下发射技术/负载自适应/功率放大器/射频电路/数值仿真Key words
micro-resistivity scanning imaging logging tool/downhole transmitter technology/load adaptability/power amplifier/radio frequency circuit/numerical simulation分类
天文与地球科学引用本文复制引用
李雨麒,施俊成,史超,杨居朋,郭英才,肖宏,马雪青,柏涛..微电阻率扫描成像测井仪基于负载自适应的发射模块设计[J].测井技术,2025,49(4):557-564,8.基金项目
中国石油天然气集团有限公司重大科技项目"地球物理井地立体探测方法与装备研发"(2020B-3712) （2020B-3712）
