SWITCHING AN OPERATING MODE OF AN NMR LOGGING TOOL

摘要

In some aspects of what is described here, a downhole nuclear magnetic resonance (NMR) logging tool can obtain NMR data from a subterranean region. The NMR logging tool includes a magnet assembly operable to produce a static magnetic field in the subterranean region. The NMR logging tool includes an antenna system having a first radio-frequency (RF) antenna, a second RF antenna, and a switching system. The switching system can switch the second antenna among operating modes while the NMR logging tool is disposed in a borehole in the subterranean region. The operating modes can include a booster mode, a spoiler mode, and an inactive mode.