A resonator that includes an elastic tube defining an interior surface and a conductor threaded through the elastic tube. Solid material fills space between the conductor and the elastic tube interior surface, such that motion of the conductor is directly transferred to the elastic tube. In a preferred embodiment, the elastic tube is electrically conductive and said solid material insulates said conductor from said elastic tube.

The disclosure provides a label-free viscosity-based analyte detection system using paramagnetic beads as an asynchronous magnetic bead rotation (AMBR) microviscometer. It is disclosed herein that the bead rotation period is linearly proportional to the viscosity of a solution comprising analytes surrounding the paramagnetic bead. Optical measurement of asynchronous microbead motion determines solution viscosity precisely in microscale volumes, thus allowing an estimate of analyte concentration. The results demonstrate the feasibility of viscosity-based analyte detection using AMBR in microscale aqueous volumes.

A system and methods are disclosed. The system includes a temperature control chamber with a temperature system to alter and monitor a temperature of the temperature control chamber and an electromagnetic viscometer (EMV) inside the temperature control chamber to measure a viscosity of a fluid. The system also includes a sample preparation cell within the temperature control chamber pressurized by a constant displacement pump outside the temperature control chamber. The sample preparation cell includes a stirrer; a first valve between a fluid supply reservoir and the sample preparation cell; a second valve between the sample preparation cell and the EMV, a venting fluid line between the sample preparation cell and a gas capturing system, and a venting fluid line to remove released gases from the sample preparation cell. The system further includes a controller to operate the sample preparation cell, temperature system, and EMV.

Nuclear magnetic resonance (NMR) gas isotherm techniques to evaluate wettability of porous media, such as hydrocarbon reservoir rock, can include constructing a NMR gas isotherm curve for a porous media sample gas adsorption under various pressures. A hydrophobic or hydrophilic nature of the porous media sample can be determined using the NMR gas isotherm curves. A wettability of the porous media sample can be determined based on the NMR gas isotherm curve. The wettability can be determined for porous media samples with different pore sizes. In the case of reservoir rock samples, the determined wettability can be used, among other things, to model the hydrocarbon reservoir that includes such rock samples, to simulate fluid flow through such reservoirs, or to model enhanced hydrocarbon recovery from such reservoirs.

A flow analyzer includes a flow container, a fluid-introducing section that introduces an introduction target fluid into the flow container, a fluid control section that performs a control process that cyclically changes the flow rate or the fluid pressure of the introduction target fluid that is introduced into the flow container from the fluid-introducing section, a discharged fluid analysis section that performs a component analysis process on a discharged fluid that has been discharged from the flow container, and a frequency analysis section that performs a frequency analysis process on a discharge profile, the discharge profile being obtained from control information about the introduction target fluid and analysis results for the discharged fluid, and representing the relationship between the component ratio in the discharged fluid and time.

Systems, devices and methods for determining a parameter of interest of a well fluid relating to a well intersecting a subterranean formation using resonant vibration. The apparatus may include a resonator assembly. The resonator assembly may comprise a plurality of resonant tines structurally coupled to behave as a single resonator. At least one resonant tine of the plurality of resonant tines may include a soft magnetic tine head comprising soft magnetic material uncontained by a supporting surface. Each corresponding tine of the plurality of resonant tines may be formed by at least the resonant tine head and a tine shaft. Each corresponding tine may have a cross section perpendicular to a longitudinal axis of the corresponding tine, the cross section including a tine head, where the cross section has a substantially continuous material composition. Each tine shaft may terminate at the tine head.

Nuclear magnetic resonance (NMR) gas isotherm techniques to evaluate wettability of porous media, such as hydrocarbon reservoir rock, can include constructing a NMR gas isotherm curve for a porous media sample gas adsorption under various pressures. A hydrophobic or hydrophilic nature of the porous media sample can be determined using the NMR gas isotherm curves. A wettability of the porous media sample can be determined based on the NMR gas isotherm curve. The wettability can be determined for porous media samples with different pore sizes. In the case of reservoir rock samples, the determined wettability can be used, among other things, to model the hydrocarbon reservoir that includes such rock samples, to simulate fluid flow through such reservoirs, or to model enhanced hydrocarbon recovery from such reservoirs.

A system is provided that can include a first tube for communicating a fluid through a wellbore. The system can also include a gap between the first tube and a first electromagnetic acoustic transducer (EMAT). The first EMAT can be positioned to magnetically couple with the first tube. The first EMAT can include a magnet and a wire coil positioned around the magnet. The first EMAT can coupled to a power source and positioned to, responsive to receiving a power from the power source, apply a first magnetic force to the first tube for determining a density or viscosity of the fluid.

A method of determining rheological properties of a fluid. The method includes: providing an open-bore tube and defining within the bore a three dimensional grid (3DG) of voxels; defining at least an inlet cross section (ICS) and an outlet cross section (OCS); defining a volume of interest within the bore between the ICS and the OCS; obtaining rheological properties of the fluid; applying a pressure gradient to the bore between the ICS and the OCS; and nuclear magnetic resonance imaging the fluid within the volume of interest to determine various aspects of the fluid.

A magnetic sensor elastometry device (MSED) and a method to perform the whole blood thromboelastography assay. It contains key components, including sample cuvette, detecting head, rotating disc, optical motion detector, and etc; and measures viscoelasticity of whole blood samples. The device optically monitors the physical motion of the magnetically driven rotating disc immersed in the blood sample. The thromboelastograph is recorded by the optical motion detector reading high pulse counts through a gated time window passing through the rotating disc. The device also includes a microcontroller and its embedded firmware to perform the functions of driving the rotating magnetic disc, generating high-frequency pulses, controlling the data pulse time window, as well as handling the user's interface, data analysis, and maintaining communication with an external computer.