Abstract: A method and system are disclosed that provide chemical composition data of a fluid. The system includes a first downhole electro-opto-mechanical device to transmit microwave radiation through the fluid. The microwave radiation is generated by the first downhole electro-opto-mechanical device in response to a first light signal. A second downhole electro-opto-mechanical device receives the microwave radiation and generates a second light signal in response to the received microwave radiation. A light detection device is coupled to the second downhole electro-opto-mechanical device to generate an electrical signal in response to the second light signal. The electrical signal is indicative of the chemical composition of the fluid.

Abstract: An illustrative downhole sensing system includes a phase-squeezer assembly, an interferometer with a downhole sensor on the sensing path, and a receiver. The phase squeezer assembly provides a phase-squeezed laser beam, preferably with a squeeze parameter greater than 2. Certain embodiments include a pulse generator that gates the phase-squeezed laser beam to form a sequence of phase-squeezed laser pulses, and may further include a compensator that converts the sequence of pulses into a sequence of double pulses with a slight frequency shift between the pulses in each pair. The interferometer conveys a reference portion of the phase-squeezed laser beam along a reference path and a sensing portion of the phase-squeezed laser beam along a sensing path. A downhole sensor along the sensing path provides the sensing portion of the phase-squeezed laser beam with a measurement-parameter dependent phase shift relative to the reference portion of the phase-squeezed laser beam, which is measured by the receiver.

Abstract: A downhole sensing system includes an optical sensor that provides a light signal with at least one attribute related to a downhole parameter. The system also includes a parametric amplification module that amplifies the light signal using squeezed or entangled light for internal mode input. The system also includes a processing unit that determines a value for the downhole parameter based on the amplified light signal.

Abstract: A gravitational logging method includes optically obtaining gravitational field measurements from one or more downhole or subsea sensor units. The method also includes inverting the gravitational field measurements as a function of position to determine a formation property. A related system includes one or more downhole or subsea sensor units to optically obtain gravitational field measurements. The system also includes a processing unit that inverts the gravitational field measurements as a function of position to determine a formation property.

Abstract: A gravitational logging method includes obtaining gravitational field measurements from a permanent array of downhole or subsea sensor units. The method also includes inverting the gravitational field measurements as a function of position to determine a reservoir property. A related system includes a permanent array of downhole or subsea sensor units to obtain gravitational field measurements. The system also includes a processing unit that inverts the gravitational field measurements as a function of position to determine a reservoir property.

Abstract: An illustrative downhole sensing system includes a phase-squeezer assembly, an interferometer with a downhole sensor on the sensing path, and a receiver. The phase squeezer assembly provides a phase-squeezed laser beam, preferably with a squeeze parameter greater than 2. Certain embodiments include a pulse generator that gates the phase-squeezed laser beam to form a sequence of phase-squeezed laser pulses, and may further include a compensator that converts the sequence of pulses into a sequence of double pulses with a slight frequency shift between the pulses in each pair. The interferometer conveys a reference portion of the phase-squeezed laser beam along a reference path and a sensing portion of the phase-squeezed laser beam along a sensing path. A downhole sensor along the sensing path provides the sensing portion of the phase-squeezed laser beam with a measurement-parameter dependent phase shift relative to the reference portion of the phase-squeezed laser beam, which is measured by the receiver.

Abstract: A downhole sensing system includes an optical sensor that provides a light signal with at least one attribute related to a downhole parameter. The system also includes a parametric amplification module that amplifies the light signal using squeezed or entangled light for internal mode input. The system also includes a processing unit that determines a value for the downhole parameter based on the amplified light signal.