Apparatus and method for direct analysis of formation composition by magnetic resonance wireline logging
AssigneeWollin Ventures, Inc.
InventorErnest WOLLIN
Life of this patent
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Abstract
A wireline or logging while drilling device includes: a first coil configured to vary the intensity of a main magnetic field so as to produce phase modulation of signals emitted by spins in a sensitive volume; and a second coil configured to excite the spins in the sensitive volume in an inverse ratio of gyromagnetic constants of the spins; and receive signals from the spins displaced in frequency from the Larmor frequency of the spins by the phase modulation produced by the first coil.
Claims5
A wireline or logging while drilling device, comprising:
- a first coil configured to vary the intensity of a main magnetic field so as to produce phase modulation of signals emitted by spins in a sensitive volume;
- and
- a second coil configured to:
- excite the spins in the sensitive volume in an inverse ratio of gyromagnetic constants of the spins;
- and
- receive signals from the spins displaced in frequency from the Larmor frequency of the spins by the phase modulation produced by the first coil.
A flow measurement device for measuring flow in or around a borehole of an earth formation, comprising:
- a magnet configured to generate a static solenoidal magnetic field with a field intensity that decreases in strength peripherally from the magnet;
- an electromagnet disposed around the magnet and configured to generate a time varying solenoidal magnetic field;
- and
- a radio frequency (RF) coil disposed around the magnet and configured to:
- generate an RF magnetic field transverse to the static solenoidal magnetic field to activate spins of nuclides having a same gyromagnetic ratio in a region of interest around the flow measurement device;
- and
- receive radio frequencies corresponding to the gyromagnetic ratio.
Dependencies are inferred from the claim text.