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Inside-out azimuthally selective NMR tool using array coil and capacitive decoupling.
Luo, Sihui; Xiao, Lizhi; Zong, Fangrong; Li, Xin; Liao, Guangzhi; Shi, Guuanghui; Men, Baiyong; Zhang, Xiang; Wang, Zhengduo; Sun, Zhe; Deng, Feng.
Afiliación
  • Luo S; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.
  • Xiao L; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China; Harvard SEAS-CUPB Joint Laboratory on Petroleum Science, Harvard University, Cambridge, USA. Electronic address: lizhi_xiao@fas.harvard.edu.
  • Zong F; Institute of Biophysics, China Academy of Sciences, Beijing, China.
  • Li X; Sinopec Research Institute of Petroleum Engineering, Beijing, China.
  • Liao G; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.
  • Shi G; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.
  • Men B; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.
  • Zhang X; Huanding Energy Services, Beijing, China.
  • Wang Z; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.
  • Sun Z; State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China.
  • Deng F; PetroChina Research Institute of Petroleum Exploration and Development, Beijing, China.
J Magn Reson ; 315: 106735, 2020 Jun.
Article en En | MEDLINE | ID: mdl-32408240
Inside-out nuclear magnetic resonance (NMR) is a unique technique for investigating large in-situ objects outside of tools, to provide pore structure and pore-bearing fluids properties. However, in borehole, objects towards azimuthal orientations pose different properties, referred to as azimuthal spatial heterogeneity. This may lead to ambiguous evaluations by utilizing present inside-out NMR measurement, which hardly resolves azimuthal information and loses the location information of oil/gas. In this paper, we for the first time design and construct an innovative tool to investigate the heterogeneity of large in-situ samples. The most key component, array coil, which performs with azimuthal selection, measurement consistency and interactive isolation, configured in this novel tool to capture heterogeneity information. Whereas, strong coupling between neighboring coil elements largely decrease the coil sensitivity. Capacitive decoupling network is bridged into adjacent ports without segmenting coils to be decoupled and could be easily adjusted by electrical relays. The coil model and numerical simulation are firstly given to demonstrate the array coil configuration, B1 field map and mutual coupling effects on coil sensitivity. Capacitive network is then introduced to be theoretically and practically analyzed to minimize coupling effects. Simulation and experimental results demonstrate that these coil elements have excellent consistency and independence to feasibly acquire the azimuthal NMR data.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Magn Reson Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Magn Reson Asunto de la revista: DIAGNOSTICO POR IMAGEM Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos