Abstract: A device and method for wellbore inspection comprising a downhole tool. The downhole tool may comprise a wireline, a sensor cartridge, and a plurality of centralizers. The method for detecting defects within a wellbore may comprise inserting a downhole tool into a wellbore, wherein the downhole tool comprises a wireline, a sensor cartridge, and a plurality of centralizers. The method also includes producing an acoustic signal with the plurality of centralizers and recording the acoustic signal with a sensor, wherein the sensor records the acoustic signal within an aperture.

Abstract: A method and system for inspecting concrete downhole. The method may comprise inserting an inspection device inside a tube. The inspection device may comprise a sensor array which may comprise a high frequency transmitter, a low frequency transmitter, and a mid frequency receiver. The inspection device may further comprise a micro controller unit, a telemetry module, and a centralizing module. The method may further comprise activating the low frequency transmitter, recording reflections of acoustic waves off a tubing or a casing, and creating a graph with an information handling system for analysis. An inspection device may comprise a sensor array which may comprise a high frequency transmitter and a mid frequency receiver. The inspection device may further comprise a sensor array housing, an information handling system, a memory module, and a differential amplifier.

Abstract: Methods for locating an acoustic source. A method may comprise measuring noise from the acoustic source from a downhole environment, which produces a measurement for processing, performing a dispersion analysis on the measurement, performing a space entropy equalization and normalization process on the measurement, performing a weighted integration on the measurement, performing a pattern recognition on the measurement, performing a weighted enhancement on the measurement, and producing a recognition factor from the measurement. A method may comprise measuring noise from the acoustic source from a downhole environment, which produces a measurement for processing, performing a dispersion analysis on the measurement, performing a time difference scan on the measurement, performing a propagation distance scan on the measurement, performing a weighted enhancement on the measurement, and producing a recognition factor from the measurement.

Abstract: Methods and a system for detecting through casing formation resistivity. A method may comprise inserting an inspection device inside a tube, activating the transmitter coil, recording signals with the receiver coil array, creating a transmitter matrix from an electromagnetic field produced from the transmitter coil, creating a receiver matrix from the recorded signals, and determining a through casing formation resistivity of a target from the transmitter matrix and the receiver matrix. A method may further comprise determining a casing thickness of a target from the transmitter matrix and the receiver matrix. An inspection device may comprise a sensor array comprising a transmitter coil array and a receiver coil array. The inspection device may further comprise a sensor array housing, wherein the sensor array is disposed within the sensor array housing, a memory module, and a differential amplifier.

Abstract: A method and system for locating a stuck pipe. The method for locating a stuck pipe may comprise inserting an inspection device into a wellbore, transmitting an electromagnetic field, inducing an eddy current within a tube to provide an induced eddy current, recording a voltage from the induced eddy current within the tube, and analyzing tube properties from the recorded voltage. A system for locating a stuck pipe may comprise a drilling rig, a tether, and a telemetry module, where the telemetry module may comprise an accelerometer. The system may comprise a centralizing module, where the centralizing module comprises at least three arms, and an inspection device, where the inspection device comprises a memory module, a transmitter and receiver controller, and a sensor array. The sensor array may comprises a receiver and a transmitter. The system may comprise an information handling system and a service device.

Abstract: An apparatus for imaging a borehole wall includes an array of acoustic transducers and a controller. The controller scans a section of the borehole wall with first acoustic beams that are transmitted by a series of sets of acoustic transducers in the array to produce adjacent first acoustic measurements that are spaced a first distance D1 apart along the borehole wall, each set having at least one transducer that is different from an adjacent set, (ii) steers a second acoustic beam along the section of the borehole wall using one set of acoustic transducers in the array to produce adjacent second acoustic measurements that are a second distance D2 apart along the borehole wall, and (iii) images the borehole wall using the first acoustic measurements and the second acoustic measurement to generate a borehole wall image, wherein at least one second acoustic measurement is between adjacent first acoustic measurements.

Abstract: A method of creating a synthetic aperture. The method may comprise identifying a static configuration, inputting the static configuration into a dynamic controller, configuring a transmitter with the dynamic controller, and configuring a receiver with the dynamic controller. The method may further comprise inputting operational variables and environmental variables into a dynamic configuration, inputting the dynamic configuration into the dynamic controller, and re-configuring the transmitter and the receiver with the dynamic controller.

Abstract: A system and method for inspecting a tube comprising a telemetry module, a centralizing module, an inspection device, a differential amplifier, a sensor array, and a service device. In embodiments, a tube inspection device may comprise a sensor array. The sensor array may further comprise a center receiver coil, a ferri-core, a peripheral receiver, and a transmitter coil. A method for inspection a tube may comprise inserting an inspection device into a tube, energizing a sensory array, inducing an eddy current within the tubing, and measuring voltage with a center receiver coil and a peripheral receiver of the sensor array.

Abstract: A device and method for wellbore inspection comprising a downhole tool. The downhole tool may comprise a wireline, a sensor cartridge, and a plurality of centralizers. The method for detecting defects within a wellbore may comprise inserting a downhole tool into a wellbore, wherein the downhole tool comprises a wireline, a sensor cartridge, and a plurality of centralizers. The method also includes producing an acoustic signal with the plurality of centralizers and recording the acoustic signal with a sensor, wherein the sensor records the acoustic signal within an aperture.

Abstract: An apparatus for imaging a borehole wall includes an array of acoustic transducers and a controller. The controller scans a section of the borehole wall with first acoustic beams that are transmitted by a series of sets of acoustic transducers in the array to produce adjacent first acoustic measurements that are spaced a first distance D1 apart along the borehole wall, each set having at least one transducer that is different from an adjacent set, (ii) steers a second acoustic beam along the section of the borehole wall using one set of acoustic transducers in the array to produce adjacent second acoustic measurements that are a second distance D2 apart along the borehole wall, and (iii) images the borehole wall using the first acoustic measurements and the second acoustic measurement to generate a borehole wall image, wherein at least one second acoustic measurement is between adjacent first acoustic measurements.

Abstract: A simulation method for simulating a three-dimensional structure, comprises the steps of: discretizing the three-dimensional structure into two-dimensional (“2-D”) layers; constructing a two-dimensional basis for each of the 2-D layers; and constructing a one-dimensional finite difference basis between the 2-D layers.

Abstract: Casing signals generated by an EMAT in a borehole are processed using at least two orthogonal band-limited filters. The band-limited filters may include Gaussian or Cauchy Wavelet filters. By using the Hilbert transform, an envelope of the filtered signals is determined and amplitudes and arrival times of individual arrivals are estimated. These can be used to estimate casing and cement properties.

Abstract: A fault diagnosing method based on a simulated vaccine is provided. The fault diagnosing method comprises steps of: establishing a dynamic simulation model for simulating a start-up operation and a steady-state operation of a technological process according to process information, an operating procedure and historical data of the technological process; running the dynamic simulation model; extracting data within a first predetermined time from the simulated normal sample set to generate a normal simulated vaccine, and extracting data within a second predetermined time from the simulated fault sample set to generate a fault simulated vaccine; acquiring the historical data of the technological process; obtaining an immune antibody coefficient of the normal simulated vaccine, and generating a normal antibody library; and obtaining an immune antibody coefficient of the fault simulated vaccine, and generating a fault antibody library according to the fault simulated vaccine.

Abstract: The present disclosure is related to apparatuses and methods for estimating borehole parameters using a plurality of reflections caused by a plurality of acoustic pulses. The reflections may overlap each other and/or the acoustic pulses. The methods may include estimating an envelope of the received acoustic signal at the at least one element of the array of transducers; and estimating at least one arrival time of at least one of the plurality of overlapping events from the envelope of the received acoustic signals, the arrival times being characteristic of the geometry of the borehole. The method may also include imaging the borehole wall. The apparatus may include an array of transducers on a rotatable transducer assembly with at least one element on the array configured to generate a plurality of acoustic pulses and receive reflections and a processor configured to perform the method.

Abstract: Method and apparatus for estimating a resistivity property of an earth formation in a borehole with oil-based drilling fluid. The method may include estimating the resistivity property using a sensitivity of a real part of a measured impedance to a reactance of a gap between a resistivity sensor and a borehole wall. The real component and the quadrature component of resistivity measurements made by a two-terminal imaging tool in a borehole having an oil-based mud are affected by the tool standoff. It is shown that the sensitivity of the real part of the resistivity measurement to the reactance of the gap can be estimated from the time derivatives of the two components of the measurements. This makes possible a principal component analysis of the data to give an improved image of the formation resistivity.

Abstract: Signals from an acoustic transducer used in a borehole include overlapping, ringing reflections from the casing walls, voids in the cement and the formation. By using the Hilbert transform, an envelope of the signals is determined and individual echoes are detected by using a Gauss-Laplace operator.

Abstract: Measurements made by a transducer assembly for downhole imaging are affected by reverberations between the transducer and the window on the outside of the assembly. The reverberations result in a stationary noise on the image. Hardware solutions to improve signal-to-noise ratio includes using a composite transducer, adjusting the distance between the transducer and the window. SNR can also be improved by processing techniques that include stacking, fitting a sinusoid to the reverberation, by envelope peak detection, and by applying a notch filter.

Abstract: An apparatus and method for estimating a parameter of interest of an earth formation. An apparatus includes an elongated support member; a primary transmitter on the elongated support member; and a receiver toroid on the elongated support member, the receiver toroid being positioned transversely on the elongated support member and including a single coil antenna. Methods include positioning a logging tool in a borehole in the earth formation; using a transverse receiver toroid on an elongated support member on the logging tool, wherein the transverse receiver toroid includes a single coil antenna; and producing a signal responsive to an electrical signal produced by a primary transmitter.

Abstract: Measurements made by a transducer assembly for downhole imaging are affected by reverberations between the transducer and the window on the outside of the assembly. The reverberations result in a stationary noise on the image. Hardware solutions to improve signal-to-noise ratio includes using a composite transducer, adjusting the distance between the transducer and the window. SNR can also be improved by processing techniques that include stacking, fitting a sinusoid to the reverberation, by envelope peak detection, and by applying a notch filter.

Abstract: Measurements made by a transducer assembly for downhole imaging are affected by reverberations between the transducer and the window on the outside of the assembly. The reverberations result in a stationary noise on the image. Hardware solutions to improve signal-to-noise ratio includes using a composite transducer, adjusting the distance between the transducer and the window. SNR can also be improved by processing techniques that include stacking, fitting a sinusoid to the reverberation, by envelope peak detection, and by applying a notch filter.