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DOWNHOLE NUCLEAR MAGNETIC RESONANCE (NMR) TOOL WITH TRANSVERSAL-DIPOLE ANTENNA CONFIGURATION.
DOWNHOLE NUCLEAR MAGNETIC RESONANCE (NMR) TOOL WITH TRANSVERSAL-DIPOLE ANTENNA CONFIGURATION.
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机译:具有横向双极天线配置的井下核磁共振(NMR)工具。
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摘要
In some aspects, a downhole nuclear magnetic resonance (NMR) tool includes a magnet assembly and an antenna assembly. The NMR tool can operate in a wellbore in a subterranean region to obtain NMR data from the subterranean region. The magnet assembly produces a magnetic field in a volume about the wellbore. The magnet assembly includes a central magnet, a first end piece magnet spaced apart from a first axial end of the central magnet, and a second end piece magnet spaced apart from a second axial end of the central magnet. The antenna assembly includes a transversal-dipole antenna. In some cases, orthogonal transversal-dipole antennas produce circular-polarized excitation in the volume about the wellbore, and acquire a response from the volume by quadrature coil detection.
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