Method for fabrication of a multivariate optical element

    公开(公告)号:US10859734B2

    公开(公告)日:2020-12-08

    申请号:US16153323

    申请日:2018-10-05

    Abstract: A method for fabricating an optical element including selecting a lamp spectrum and bandpass filter spectrum, obtaining a spectral characteristics vector to quantify the concentration of a component in a sample and obtaining a target spectrum from the lamp spectrum, the bandpass filter spectrum, and the spectral characteristics vector, is provided. Further including selecting a number of layers less than a maximum value, and performing an optimization routine using the index of refraction and thickness of each of the number of layers until an error between a model spectrum and the target spectrum is less than a tolerance value, or a number of iterations is exceeded. And reducing the number of layers if the error is less than a tolerance and stopping the procedure if the number of iterations is exceeded. A device using an optical element for optically-based chemometrics applications fabricated using the method above is also provided.

    Digital 2D holographic spectrometer for material characterization

    公开(公告)号:US10781689B2

    公开(公告)日:2020-09-22

    申请号:US16072488

    申请日:2016-04-27

    Abstract: A tool including a probe deployable within a wellbore and an optical analysis device coupled to the probe is provided. The optical analysis device includes a two-dimensional (2D) waveguide layer to transmit and to disperse an electromagnetic radiation according to wavelength and including detector elements disposed along an edge, each detector element providing a signal associated with a pre-determined wavelength portion of the electromagnetic radiation. The optical analysis device also includes a substrate layer electrically coupled to receive the signal from each of the detector elements and form a spectrum of the electromagnetic radiation with the processor. A method for using the tool in a wellbore application, a pipeline application, or a reservoir storage application is also provided.

    Method and device for downhole corrosion and erosion monitoring

    公开(公告)号:US10513922B2

    公开(公告)日:2019-12-24

    申请号:US14431011

    申请日:2013-09-06

    Abstract: Methods and systems for monitoring material loss in a downhole environment arising from corrosion and/or erosion include placing a downhole sensor in a borehole. The resistance of the downhole sensor is measured using a four-probe resistance technique in which a power source is provided at two electrodes of the downhole sensor and voltage is measured at two voltage taps. A rise in voltage over time indicates loss of conductive material on the downhole sensor. The conductive material on the downhole sensor may be formed to provide discrete voltage increases for improving reliability of material loss and/or rate of material loss resistance measurements.

    DETERMINATION OF PORE SIZE DISTRIBUTION OF RESERVOIR ROCK

    公开(公告)号:US20190316466A1

    公开(公告)日:2019-10-17

    申请号:US16324382

    申请日:2016-12-21

    Abstract: This disclosure provides a method of determining a pore throat size distribution of reservoir rock, comprising injecting a set of different-sized probe particles through a portion of reservoir rock and measuring retention volumes or times of each of the different-sized probe particles eluting from the portion of reservoir rock. This disclosure also provides a testing apparatus comprising a probe tube for receiving a set of different-sized probe particles in an elution fluid returning from a portion of reservoir rock and an analytical module connected to receive the elution fluid from the probe tube. The module includes a flow cell to receive the elution fluid from the probe tube, a radiation source positioned to direct a radiation beam though a window of the cell into the eluting fluid in the cell, and a sensor for detecting portions of the radiation beam that have interacted with the different-sized probe particles such that retention volumes or times each of the probe particles of one size class can be distinguished from all other size classes of the set.

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