摘要
分析随钻微电阻率扫描成像方法和探测器方案,研制一种新型随钻高分辨率电阻率成像工程仪器,并通过现场应用试验验证仪器的可行性和可靠性。基于非接触式耦合侧向电阻率测量原理,分析随钻条件下的井筒电场建立和扫描成像方法,形成上下两个发射电极聚焦、中间3个成像电极接收的电极系组合方案。利用电磁场有限元仿真确定电极系源距和仪器探测特性。结果表明仪器的裂缝电阻率真值分辨率与成像电极直径相当,扫描图像上对5 mm裂缝有可辨识响应;高速采集电子系统和多传感器组合在仪器动态旋转下检测电阻率信号和工具面角度,可实现高转速下的128扇区全井筒覆盖的地层图像;研制的随钻电阻率成像仪器在现场试验中获得了高分辨率的地层图像,随钻电阻率曲线与电缆测井数据高度吻合,且分辨率更高,能更好地分辨出薄层信息。
Micro-resistivity imaging method and scanning sensor was studied,and a corresponding novel high resolution resistivity imaging while drilling tool(ResImg)was proposed and implemented.Several oilfield trails are carried out to verify the new tool’s feasibility and reliability.Based on the contact-free coupling resistivity measuring principle,the excitement of wellbore electric field and scanning scheme were analyzed.The electrode system were built,which consists of upper and lower transmitting focusing electrodes and three middle imaging electrodes.FEM simulation was used to determine the source distance and detection characteristics of the instrument.The longitudinal truth-value resolution off racture was close to the diameter of imaging electrode,and could perceive 5 mm fracture’s response.High speed electronic system and multi-sensor combination were employed to detect micro resistivity signal and dynamic tool face while tool’s rotating during drilling.In initial field trails,ResImg tool successfully obtained 128 sector resolution stratigraphic images.The resistivity curve while drilling was highly consistent with the wireline logging data and had a higher resolution,which could better distinguish the thin layer information.
作者
李新
倪卫宁
米金泰
康正明
闫立鹏
宋朝晖
LI Xin;NI Weining;MI Jintai;KANG Zhengming;YAN Lipeng;SONG Zhaohui(SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China;School of Electronic Engineering, Xi an Shiyou University, Xi an 710300, China)
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第6期46-52,共7页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家科技重大专项(2016ZX05021-002)
中国石化科技部科技攻关项目(P17002-1)。
关键词
随钻测井
电阻率成像
可视化钻井
非接触耦合
logging while drilling(LWD)
resistivity imaging
visual drilling
contactless coupling
