Petroleum Science >2012,??Issue 1:??38-45 DOI: https://doi.org/10.1007/s12182-012-0180-2
Sensor design and implementation for adownhole NMR fluid analysis laboratory Open?Access
文章信息
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
文章摘要
fluid analysis laboratory that can evaluate fluid information in real time at reservoir conditions at a depth
of several thousand meters. The aim is to monitor the pollution of the formation fluids and quantitatively
evaluate NMR characteristics of the fluids. It focuses on the design of the structure and parameters of a
sensor with zero stray fields. Two separate coils are designed to measure NMR characteristics of flowing
or static fluids. A method is proposed to use the Bloch equation, to guide the optimization of the NMR
sensor. Finally, the measured results confirm that the design is reasonable. There is a homogeneous static
field (perpendicular to the axial direction) in the center of the sensor, and there are no stray external fields.
The novel design of pre-polarization magnet improves the signal to noise ratio, while shortening the
sensor length.
关键词
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NMR, fluid analysis laboratory, magnet, Bloch equation