Abstract: A system for processing DAS VSP surveys in real-time is provided. The system includes a DAS data collection system coupled to at least one optical fiber at least partially positioned within a wellbore and configured to repeatedly activate a seismic source of energy. The system further includes an information processing system connected to the DAS data collection system. A seismic dataset is received from the DAS data collection system. The seismic dataset includes a plurality of seismic data records. Two or more of the plurality of seismic data records are combined into a stack. A quality metric indicative of a desired signal-to-noise ratio or incoherence of the stack is determined for each processed seismic dataset collected from a repeated source. Instructions are sent to the DAS data collection system to stop activating the seismic source, in response to determining that the quality metric has reached a predefined threshold.

Abstract: A method for processing vertical seismic profiling (VSP) data is provided. The method includes receiving VSP data in response to seismic energy applied to the formation, processing a down-going portion of the VSP data associated with a down-going wave field, outputting a first set of estimation values based on processing the down-going portion of the VSP data, the first set of estimation values estimating at least one of slowness or velocity, processing an up-going portion of the VSP data associated with an up-going wave field, outputting a second set of estimation values based on processing the up-going portion of the VSP data, the second set of estimation values estimating at least one of slowness or velocity, and determining an estimation associated with the formation based on the first and second sets of estimation values.

Abstract: Disclosed are piston actuator devices and their uses for magnetic resonance elastography (MRE).

Abstract: A locomotive communication system includes a first communication device located onboard a first locomotive in a rail vehicle system formed from the first locomotive and at least a second vehicle in the rail vehicle system and a second communication device located onboard the second vehicle in the rail vehicle system, the first and second communication devices communicatively coupled with each other via a wired connection extending between the first and second communication devices. The first and second communication devices are configured to share a security credential via the wired connection. The first and second communication devices also are configured to establish a secure wireless network between the first and second communication devices using the security credential that is shared via the wired connection.

Abstract: A controller of the data storage system may poll a non-volatile memory component to determine an operational status of the non-volatile memory component after a memory operation has been initiated in the non-volatile memory component. The controller may, in response to determining the operational status of the non-volatile memory component is busy, update a polling interval based on a polling factor. The controller may re-poll the non-volatile memory component to determine the operational status of the non-volatile memory component after expiration of the updated polling interval. The controller may repeat the updating of the polling interval and the re-polling of the non-volatile memory component until the operational status of the non-volatile memory component is determined to be ready or until a predetermined number of iterations of the updating and re-polling have been performed if, in response to the re-polling, the operational status is determined to be busy.

Abstract: A method for identifying a location of a distributed acoustic system channel in a distributed acoustic system. The method may comprise generating a two or three dimensional layer model interface with an information handling system, preparing a P-wave first arrival pick time table, estimating an initial model layer properties, estimating a location of the distributed acoustic system channels, preparing an overburden file of layer properties, running an anisotropic ray tracing, defining an upper and a lower limits for model parameters, specifying parameters for the inversion, running an inversion, selecting a solution based at least in part on stored error predictions, and calculating a mean and a standard deviation of an inverted model parameter.

Abstract: A distributed acoustic sensor is positioned within a wellbore of a geologic formation. Seismic waves are detected using the distributed acoustic sensor. A raw seismic profile is generated based on the detected seismic waves. Resonant noise is identified and reduced in seismic data associated with the raw seismic profile.

Abstract: A distributed acoustic sensing (DAS) system is coupled to an optical fiber along a plurality of channels. The system generates a DAS seismic profile of the subsurface formation based on detected seismic data, identifies at least one region having coherent noise, and identifies which of the plurality of channels are within the identified at least one region. For each trace of data associated with the plurality of noisy channels, the system converts, from a time to a wavelet domain, the trace of data and a reference trace having less coherent noise, and suppresses the wavelet coefficients of the trace of data based on the wavelet coefficients of the reference trace. After the system mitigates the noise in the wavelet domain, an inverse wavelet transform is applied to the trace of data to convert back to the time domain and create a reduced noise DAS seismic profile.

Abstract: High fidelity velocity models are generated for acoustic vertically transverse isotropic media by taking advantage of full-waveform based modeling using VSP data. The present disclosure determines VTI parameters in acoustic media using pseudo-acoustic equations which can eliminate the contribution from shear waves, and thus significantly reduce the time needed to perform inversion. The methods disclosed herein provide workflows for performing full waveform inversion to provide velocity models used to generate seismic images with high quality and resolution.

Abstract: Various embodiments include apparatus and methods implemented to simulate geophone data from distributed acoustic sensing data, such as simulating vertical component geophone waveform data from distributed acoustic sensing data. Embodiments include measuring vertical component of strain at a plurality of vertical positions along an optical fiber disposed along a wellbore at a well site. The measured vertical component of strain can be processed to generate a vertical component of displacement. The vertical component of displacement can be generated to generate a vertical component of velocity from which a waveform simulating a waveform of geophone data can be output. Additional apparatus, systems, and methods are disclosed.

Abstract: Racks are used to carry cargo on top of vehicles. Racks include crossbars and assemblies configured to secure specific cargo items to the crossbars. Clamps for connecting cargo-specific assemblies to the crossbars, include first and second jaws, and an adjustment device for selectively controlling horizontal relative movement between the jaws.

Abstract: Rack systems are disclosed for coupling accessories to crossbars on top of a vehicle. A coupling device may include a flexible strap member adjustably anchored at one end of a body. The strap member may be connected to the other end of the body and tightened. A mounting assembly may be provided on the top side of the body for connection to a cargo-specific carrier or accessory. A coupling device may also include a flexible fitting member configured to grip a round or rectangular crossbar. A cap member may be configured to be mounted on the fitting member and have one or more ramp surfaces which form a sliding interface with a corresponding surface on the fitting member, thereby providing a closing or tightening effect on the fitting member with respect to the crossbar. Other coupling devices are configured to grip or clamp a t-slot in the crossbar.

Abstract: A controller of a storage system may poll a non-volatile memory component to determine an operational status of the memory component after a memory operation has been initiated in the memory component. The controller may, in response to determining the operational status of the memory component is busy, update a polling interval based on a polling factor. The controller may re-poll the memory component to determine the operational status of the memory component after expiration of the updated polling interval. The controller may repeat the updating of the polling interval and the re-polling of the memory component until the operational status of the memory component is determined to be ready or until a predetermined number of iterations of the updating and re-polling have been performed if, in response to the re-polling, the operational status is determined to be busy.

Abstract: A sensing system may comprise a deployment device having an optical fiber cable with a predetermined curvature or an intrinsic curvature. The sensing system may be deployed into a location that is remote or difficult to navigate, for example, a large vessel or a borehole of a well. A deployment device may deploy the optical fiber cable and a tension control tool may maintain the deployment device along with the optical fiber cable in a straight or non-curved shape until the optical fiber cable has reached a predetermined location or position. A force may then be applied to the optical fiber cable to cause a portion of the optical fiber cable to contact an interior wall of the area or location, for example, a borehole or the deployment device. Measurements may be retrieved from the optical fiber cable, for example, measurements used in distributed acoustic sensing in vertical seismic profiling.

Abstract: Various embodiments include apparatus and methods implemented to take into consideration gauge length in optical measurements. In an embodiment, systems and methods are implemented to interrogate an optical fiber disposed in a wellbore, where the optical fiber is subjected to seismic waves, and to generate a seismic wavefield free of gauge length effect and/or to generate a prediction of a seismic wavefield of arbitrary gauge length, based on attenuation factors of a plurality of wavefields acquired from interrogating the optical fiber. In an embodiment, systems and methods are implemented to interrogate an optical fiber disposed in a wellbore, where the optical fiber is subjected to seismic waves, and to convert a seismic wavefield associated with a first gauge length to a seismic wavefield associated with a different gauge length that is a multiple of the first gauge length. Additional apparatus, systems, and methods are disclosed.

Abstract: An example method includes at least partially positioning within a wellbore an optical fiber of a distributed acoustic sensing (DAS) data collection system. Seismic data from the DAS data collection system may be received. The seismic data may include seismic traces associated with a plurality of depths in the wellbore. A quality factor may be determined for each seismic trace. One or more seismic traces may be removed from the seismic data based, at least in part, on the determined quality factors.

Abstract: A method of performing acoustic logging comprises generating a first acoustic signal from a first source at a first time, wherein the first source is a first distance away from a wellbore wall, and generating a second acoustic signal from a second source at a second time, wherein the second source is a second distance away from the wellbore wall. The difference between the first time and the second time depends on a calibration value.

Abstract: A controller of the data storage system may poll a non-volatile memory component to determine an operational status of the non-volatile memory component after a memory operation has been initiated in the non-volatile memory component. The controller may, in response to determining the operational status of the non-volatile memory component is busy, update a polling interval based on a polling factor. The controller may re-poll the non-volatile memory component to determine the operational status of the non-volatile memory component after expiration of the updated polling interval. The controller may repeat the updating of the polling interval and the re-polling of the non-volatile memory component until the operational status of the non-volatile memory component is determined to be ready or until a predetermined number of iterations of the updating and re-polling have been performed if, in response to the re-polling, the operational status is determined to be busy.