A device for measuring a variation (ΔC.sub.X) of a capacitance (C.sub.X), includes: elements for charging the capacitance (C.sub.X) on the basis of a supply voltage (V.sub.CC). elements for discharging the capacitance (C.sub.X) into a reference capacitance (C.sub.S) in a fixed number of discharges (x), elements for measuring a voltage (V.sub.S) and for detecting a threshold of voltage (V.sub.TH) across the terminals of the reference capacitance (C.sub.S). elements for charging with current (I.sub.C) the reference capacitance (C.sub.S) on the basis of the supply voltage (V.sub.CC) for a duration (t), after the transfer of charge from the capacitance (C.sub.X) into the reference capacitance (C.sub.S), and elements for measuring the variation between the duration (t) with respect to a previously measured duration so as to estimate the variation (ΔC.sub.X) of the capacitance (C.sub.X).

A system and method for predictive flow assurance assessment by measuring at least one actual parameter related to a multiphase fluid mixture flowing in a main flow line, taking a sample from the multiphase fluid mixture flowing in the main flow line, modifying at least one control parameter of the sample until a transition appears, wherein said transition would cause a flow issue when occurring in the main flow line, detecting the transition of the sample and determining a corresponding transition value associated with the at least one control parameter, calculating a difference between the at least one actual parameter and the at least one transition value, said difference being representative of a margin relatively to a similar transition appearance in the main flow line causing a flow issue in the main flow line, and implementing a flow issue preventing step when the difference exceeds a given threshold.

In a method and magnetic resonance (MR) system to acquire MR data in a predetermined volume segment of an examination subject, the data are acquired with at least one echo train that includes at least two signal echoes. The same number of echoes is acquired for each echo train of the at least one echo train, with this number of echoes corresponding to an echo train length. The total number of echoes that are required to acquire the MR data and the echo train length is adapted so that the total number corresponds to a whole number multiple of the echo train length.

A dipole antenna system emplaced in a subsurface formation is configured to produce radio frequency (RF) fields for recovery of thermally responsive constituents in a subsurface formation. Coaxially disposed inner and outer conductors connected at an earth surface to an RF power source form a transmission line carrying power from the earth surface to a dipole antenna proximate said formation. The inner conductor protrudes from the outer conductor at a junction forming one pole of the antenna. The system also includes at least one choke structure attached to the outer conductor at a distance at least ¼ wavelength above said junction, confining the RF fields such that the exposed portion of the outer conductor between the junction and the choke forms a second pole of the antenna. The dipole system is configured to confine a majority of said RF fields in a volume of said formation situated adjacent to the antenna. The antenna deposits heat into the formation around an oil well independent of the flow of oil carrying heat back into the well. Such heating provides several mechanisms to enhance the flow of oil into a well.

Systems and methods for magnetic resonance analysis and imaging are provided. IN particular, pulse sequences for DWI, APT, and MRS analysis and imaging are provided which rely on an RF excitation pulse for the signal of interest, followed by one or more refocusing pulses and acquisition steps, based on the type of imaging.

Systems and methods for a magnetometer comprise a single-isotope silicon crystal doped with impurity atoms. The Larmor precession associated with energy level transitions of the impurity atoms may be detected and used to measure an external magnetic field.

A magnetic resonance imaging apparatus includes an imaging unit configured to carry out magnetic resonance imaging of a patient using a transmitting QD coil that allows at least one of phase and amplitude of a radio-frequency transmit pulse on at least one input channel of the transmitting QD coil to be adjusted independently of each other, and an adjustment unit arranged to adjust at least one of the phase and the amplitude of the radio-frequency transmit pulse according to imaging conditions.

A magnetic resonance imaging apparatus according to an embodiment includes an acquiring unit, a detecting unit, a deriving unit, and an imaging controller. The acquiring unit acquires three-dimensional image data including a target organ. The detecting unit detects an upper end position and a lower end position of the target organ in the three-dimensional image data. The deriving unit derives an imaging range of subsequent imaging performed after acquisition of the three-dimensional image data based on the upper end position and the lower end position of the target organ. The imaging controller controls performance of the subsequent imaging in accordance with the imaging range.

A method of estimating a wettability characteristic of a formation includes: disposing a magnetic resonance (MR) measurement apparatus in a borehole; generating a low gradient static magnetic field and an oscillating magnetic field in a region of the formation; detecting a MR signal generated in the region; calculating relaxation parameters for at least one fluid in the region; and estimating the wettability characteristic of the region based on the relaxation parameters.

A system comprises a wellbore having a plurality of casings disposed therein and one or more electromagnetic coils disposed within the wellbore. The one or more electromagnetic coils are configured to generate and direct one or more excitation signals toward the plurality of casings and receive one or more response signals based on interactions of the one or more excitation signals with the plurality of casings. The system further comprises a casing evaluation module comprising a processor and memory and communicably coupled to the one or more electromagnetic coils. The casing evaluation module is operable to determine whether defect exists in at least one of the plurality of casings using a first response signal received from the one or more electromagnetic coils and elemental defect information, the elemental defect information comprising a plurality of combinations of small defect information.