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公开(公告)号：US09863246B2
公开(公告)日：2018-01-09
申请号：US14149537
申请日：2014-01-07
发明人： Soumyajit Mandal , Yi-Qiao Song
CPC分类号： E21B49/087 , E21B49/10 , G01N33/28 , G01V3/32
摘要： A hydrocarbon sample is subjected to a chemically selective J-editing nuclear magnetic resonance (NMR) pulse sequence. Resulting signals are analyzed in order to identify a coupling frequency present in at least one molecule of the hydrocarbon sample. A J-coupling frequency of approximately 150 Hz is indicative of a component having an internal double bonded carbon atom (i.e., an olefin). The presence of an olefin in a hydrocarbon sample can be indicative of the presence of a synthetic based mud (SBM) in the sample.
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公开(公告)号：US09689937B2
公开(公告)日：2017-06-27
申请号：US14067567
申请日：2013-10-30
发明人： Yi-Qiao Song , Soumyajit Mandal
CPC分类号： G01R33/34092 , G01N24/081 , G01R33/34053 , G01R33/3607 , G01R33/3614 , G01V3/32
摘要： A non-resonant transmitter for a magnetic resonance (MR) system, such as a nuclear magnetic resonance (NMR) system, is described herein. The transmitter includes a coil for applying NMR pulse sequences to a substance. The coil is coupled to a circuit that includes a capacitor, a number of switches, and a power source. The transmitter operates in two modes. In a charging mode, the switches decouple the coil from the capacitor and the capacitor is charged by the power source. In a discharging mode, a radio frequency pulse is generated and the switches couple and decouple the coil from the capacitor so that the capacitor provides power to the coil. The addition of the capacitor improves the power factor of the circuit and reduces power draw from the power source.
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公开(公告)号：US20150253454A1
公开(公告)日：2015-09-10
申请号：US14431843
申请日：2013-09-27
CPC分类号： G01V3/32 , E21B49/088 , G01N24/081 , G01N24/10 , G01R33/307 , G01R33/345 , G01R33/383 , G01R33/448 , G01R33/4608 , G01R33/4633
摘要： A coaxial nuclear magnetic resonance (NMR) probe and related methods are described herein. The coaxial NMR probe includes a housing with a fluid inlet, a fluid outlet, a longitudinal axis, and an interior volume. The housing contains a fluid sample that is analyzed by the probe. The coaxial NMR probe also includes an elongated conductor disposed along the longitudinal axis of the housing. The elongated conductor generates an oscillating electromagnetic field within the interior volume of the housing. The oscillating electromagnetic field produces a NMR signal within the fluid sample. The elongated conductor may also be used to receive this NMR signal. The NMR signal is then analyzed to determine information about the fluid sample. Various NMR pulse sequences for use with this coaxial probe and other coaxial probes are also described herein.
摘要翻译： 本文描述了同轴核磁共振（NMR）探针和相关方法。 同轴NMR探头包括具有流体入口，流体出口，纵向轴线和内部体积的壳体。 壳体包含被探针分析的流体样品。 同轴NMR探头还包括沿着壳体的纵向轴线设置的细长导体。 细长的导体在壳体的内部空间内产生振荡的电磁场。 振荡电磁场在流体样品内产生NMR信号。 细长导体也可用于接收该NMR信号。 然后分析NMR信号以确定关于流体样品的信息。 本文还描述了用于该同轴探针和其它同轴探针的各种NMR脉冲序列。
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公开(公告)号：US11073633B2
公开(公告)日：2021-07-27
申请号：US15506759
申请日：2015-08-27
发明人： Yi-Qiao Song , Soumyajit Mandal , Yiqiao Tang , David McCowan
摘要： An NMR system includes a radio frequency (RF) NMR application-specific integrated circuit (ASIC) chip configured to generate an RF output signal and a rectifier configured to receive the RF output signal and convert the RF output signal to (a) a direct current (DC) pulsed field gradient (PFG) signal or (b) a DC trigger signal for at least one of (i) activating at least one component of an NMR system external to the NMR RF ASIC chip and (ii) synchronizing at least one component of an NMR system external to the NMR RF ASIC chip.
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公开(公告)号：US20180299579A1
公开(公告)日：2018-10-18
申请号：US15765245
申请日：2016-09-08
发明人： Krishnamurthy Ganesan , Soumyajit Mandal , Van D. M. Koroleva , Gabriela Leu , Payam Tabrizi , Nicholas Heaton , Martin D. Hurlimann , Yi-Qiao Song
摘要： A method for measuring one or more properties of a formation includes applying a magnetic field to a subterranean formation using a downhole tool. A radiofrequency signal is transmitted into the subterranean formation that is exposed to the magnetic field. The radiofrequency signal induces a transverse magnetization in the subterranean formation, and the transverse magnetization induces an initial voltage signal in the downhole tool. The initial voltage signal is amplified using a first amplifier in the downhole tool such that the first amplifier outputs a first amplified voltage signal. The first amplified voltage signal is introduced to an input of the first amplifier, such that the first amplifier amplifies the first amplified voltage signal and outputs a second amplified voltage signal
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公开(公告)号：US10088594B2
公开(公告)日：2018-10-02
申请号：US14516425
申请日：2014-10-16
发明人： Jeffrey L. Paulsen , Martin D. Hurlimann , Julius Kusuma , Brian E. Boling , Soumyajit Mandal , Brian Gaddis
摘要： A nuclear magnetic resonance (NMR) system includes a transmitter of an NMR tool to output a magnetic field pulse into a zone of interest, a receiver of the NMR tool to output an NMR echo data set produced from an interaction of the magnetic field pulse and the zone of interest, and an NMR echo processing module including a filter matched to a response of the NMR tool to output a filtered NMR echo data set from the NMR echo data set, wherein the filter is matched to an echo shape of the NMR echo data, is matched to an average of a selected signal spectra of the NMR echo data set, or dynamically changes in response to a measurement.
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公开(公告)号：US10001578B2
公开(公告)日：2018-06-19
申请号：US14272325
申请日：2014-05-07
摘要： A method for applying a nuclear magnetic resonance (NMR) sequence is described herein. The method includes applying a series of refocusing pulses to a substance within an inhomogeneous static magnetic field. Each refocusing pulse in the series of refocusing pulses includes a central axis, a total pulse duration greater than t180, and at least five segments (e.g., 5, 7, 11, 20, and 21). The phase of each segment is substantially anti-symmetric about the central axis of the refocusing pulse. In a more particular embodiment, the phase of each segment is also symmetric about the central axis of the refocusing pulse and the five segments include a substantially constant amplitude.
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公开(公告)号：US10088540B2
公开(公告)日：2018-10-02
申请号：US14888732
申请日：2014-05-01
发明人： Yi-Qiao Song , Soumyajit Mandal
摘要： Methods and systems for identifying a chemical species within a substance using nuclear quadrupole resonance (NQR) are described herein. One method includes applying a number of NQR perturbation-detection pulse sequences to the substance. Each perturbation-detection pulse sequence includes a perturbation segment applied at a perturbation frequency and a detection segment applied at a second different frequency. As the sequences are applied, the perturbation frequency, the second frequency, or both are varied for each pulse sequence. The method also includes applying a number of NQR reference pulse sequences to the substance at a reference frequency. The reference frequency is varied for each pulse sequence. A chemical species is identified within the substance by comparing (i) a set of NQR signals generated by the perturbation-detection pulse sequences with (ii) a reference set of NQR signals generated by the reference pulse sequences.
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公开(公告)号：US09678182B2
公开(公告)日：2017-06-13
申请号：US14213887
申请日：2014-03-14
发明人： Soumyajit Mandal , Shin Utsuzawa , Yi-Qiao Song
CPC分类号： G01R33/3621 , G01N24/081 , G01R33/3614 , G01V3/32
摘要： A magnetic resonance (MR) receiver is described herein. The MR receiver can be used to process nuclear magnetic resonance (NMR) signals. The MR receiver includes a transformer that amplifies the MR signals and a preamplifier that receives the MR signals from the transformer. The preamplifier can include a transimpedance amplifier circuit with an input stage that includes a field effect transistor.
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公开(公告)号：US10962674B2
公开(公告)日：2021-03-30
申请号：US15494009
申请日：2017-04-21
IPC分类号： G01N24/08 , G01V3/32 , G01R33/561 , G01R33/44 , G01R33/38
摘要： Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T180. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.
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