Abstract: A downhole fluid analysis system includes an optical sensor comprising, which includes a light source configured to emit light comprising a plurality of wavelengths, a light detector, and an optical tip through which at least a portion of the light travels and returns to the detector, wherein the incident angle of the light causes total internal reflection within the optical tip. The system further includes a piezoelectric helm resonator that generates a resonance response in response to an applied current, and an electromagnetic spectroscopy sensor positioned symmetrically with respect to the piezoelectric helm resonator in at least one direction. The light may be reflected in the optical tip at one or more reflection points, and each reflection point may generate an evanescent wave in a medium surrounding the optical tip. The light may be internally reflected in the optical tip at a plurality of reflection points.

Abstract: A downhole fluid analysis system includes an optical sensor comprising, which includes a light source configured to emit light comprising a plurality of wavelengths, a light detector, and an optical tip through which at least a portion of the light travels and returns to the detector, wherein the incident angle of the light causes total internal reflection within the optical tip. The system further includes a piezoelectric helm resonator that generates a resonance response in response to an applied current, and an electromagnetic spectroscopy sensor positioned symmetrically with respect to the piezoelectric helm resonator in at least one direction. The light may be reflected in the optical tip at one or more reflection points, and each reflection point may generate an evanescent wave in a medium surrounding the optical tip. The light may be internally reflected in the optical tip at a plurality of reflection points.

Abstract: A downhole fluid analysis device includes a piezoelectric helm resonator, a spectroscopy sensor positioned symmetrically with respect to the piezoelectric helm resonator in at least one direction, and a circuit comprising a first terminal and a second terminal electrically coupled to a power supply. The piezoelectric helm resonator and the spectroscopy sensor are electrically coupled in parallel between the first and second terminals. The power supply drives the piezoelectric helm resonator with a voltage of a first polarity and the spectroscopy sensor with a voltage of a second polarity. The circuit includes at least one current flow control device in the circuit configured to prevent both the piezoelectric helm resonator and the spectroscopy sensor from being powered simultaneously.

Abstract: A downhole fluid analysis device includes a piezoelectric helm resonator, an optical sensor, and an electromagnetic spectroscopy sensor. The piezoelectric helm resonator includes a strain bar and a pair of electrodes coupled to opposite sides of the strain bar. The piezoelectric helm resonator further includes a pair of tines, in which a first tine of the pair of tines is coupled to opposite ends of the strain bar, the pair of tines each having an arc, and such that strain across a transverse face of the strain bar generates a resonance response from the pair of tines. The optical sensor is positioned centrally with respect to the piezoelectric helm resonator, and the spectroscopy sensor is positioned symmetrically with respect to the piezoelectric helm resonator in at least on direction.

Abstract: A downhole fluid analysis system includes an optical sensor comprising, which includes a light source configured to emit light comprising a plurality of wavelengths, a light detector, and an optical tip through which at least a portion of the light travels and returns to the detector, wherein the incident angle of the light causes total internal reflection within the optical tip. The system further includes a piezoelectric helm resonator that generates a resonance response in response to an applied current, and an electromagnetic spectroscopy sensor positioned symmetrically with respect to the piezoelectric helm resonator in at least one direction. The light may be reflected in the optical tip at one or more reflection points, and each reflection point may generate an evanescent wave in a medium surrounding the optical tip. The light may be internally reflected in the optical tip at a plurality of reflection points.

Abstract: A downhole fluid analysis device includes a piezoelectric helm resonator, an optical sensor, and an electromagnetic spectroscopy sensor. The piezoelectric helm resonator includes a strain bar and a pair of electrodes coupled to opposite sides of the strain bar. The piezoelectric helm resonator further includes a pair of tines, in which a first tine of the pair of tines is coupled to opposite ends of the strain bar, the pair of tines each having an arc, and such that strain across a transverse face of the strain bar generates a resonance response from the pair of tines. The optical sensor is positioned centrally with respect to the piezoelectric helm resonator, and the spectroscopy sensor is positioned symmetrically with respect to the piezoelectric helm resonator in at least on direction.

Abstract: A downhole fluid analysis device includes a piezoelectric helm resonator, a spectroscopy sensor positioned symmetrically with respect to the piezoelectric helm resonator in at least one direction, and a circuit comprising a first terminal and a second terminal electrically coupled to a power supply. The piezoelectric helm resonator and the spectroscopy sensor are electrically coupled in parallel between the first and second terminals. The power supply drives the piezoelectric helm resonator with a voltage of a first polarity and the spectroscopy sensor with a voltage of a second polarity. The circuit includes at least one current flow control device in the circuit configured to prevent both the piezoelectric helm resonator and the spectroscopy sensor from being powered simultaneously.

Abstract: A downhole fluid analysis tool includes a tool body, a plurality of arms coupled to the tool body and movable between a retracted position and one or more expanded positions away from a central axis of the tool body. The plurality of arms are at an angle with respect to the central axis, the angle being different in each of the one or more expanded positions. The tool further includes a plurality of fluid sensors coupled to the plurality of arms. A fluid sensor of the plurality of the fluid sensors is movably coupled to an arm of the plurality of arms and configured to pivot across a plurality of angles with respect to the arm. The angle of the fluid sensor with respect to the arm is associated with the angle of the arm with respect to the central axis of the tool body.

Abstract: Embodiments of the present disclosure include a method for determining at least one fluid property that includes obtaining electrical admittance data from a downhole tool, the admittance data being associated with a fluid in a wellbore. The method also includes obtaining reference electrical admittance data for air. The method further includes comparing the admittance data to the reference admittance data. The method also includes determining an offset between a first peak of the admittance data and a second peak of the reference admittance data. The method includes determining the at least one fluid property based at least in part on the determined resonance frequency offset.