中南大学学报（自然科学版）2018，Vol.49Issue(5)：1281-1288,8.DOI:10.11817/j.issn.1672-7207.2018.05.032
基于C4D技术的油基钻井液随钻侧向电阻率测井信号检测
Signal detection of lateral resistivity LWD based on C4D technique with oil-based drilling fluid
摘要
Abstract
In order to solve the problem of measurement limits of traditional lateral resistivity logging while drilling (LWD) with oil-based drilling fluid, a method based on the capacitively coupled contactless conductivity detection (C4D) technique was proposed for signal detection and the corresponding device was developed. First, an equivalent logging circuit model based on C4D was established. Then, digital phase sensitive demodulation (DPSD) technique was introduced to detect amplitude and phase of weak logging signal, and formation resistivity was obtained by the established model. Meanwhile, finite element simulation was conducted to study validity of the model as well as response characteristics of the designed logging sensor. Finally, a simulated logging experimental device was designed, and the experiment was carried out at multiple excitation frequency. The results show that the designed device has good performance when excitation frequency is 20 kHz, and corresponding relative measurement errors are less than 5% within equivalent formation resistivity range of 0.135-8.368 kΩ·m.关键词
随钻侧向电阻率测井/油基钻井液/C4D/数字相敏解调/有限元仿真Key words
lateral resistivity LWD/oil-based drilling fluid/C4D/DPSD/finite element analysis分类
信息技术与安全科学引用本文复制引用
孙宏博,倪卫宁,李新,张卫,王保良,冀海峰,黄志尧,李海青..基于C4D技术的油基钻井液随钻侧向电阻率测井信号检测[J].中南大学学报（自然科学版）,2018,49(5):1281-1288,8.基金项目
国家科技重大专项(2016ZX05021-002)(Project(2016ZX05021-002)supported by the National Science and Technology Major Program of China) （2016ZX05021-002）
