AMPLITUDE CONTROL FOR RESONANT SEISMIC SOURCE DEPTH EXCURSIONS

    公开(公告)号:US20200225375A1

    公开(公告)日:2020-07-16

    申请号:US16717351

    申请日:2019-12-17

    摘要: A method of seismic exploration above a region of the subsurface of the earth containing structural or stratigraphic features conducive to the presence, migration, or accumulation of hydrocarbons comprises setting a tow depth of a resonant seismic source, producing a resonant frequency at a first amplitude with the resonant seismic source at the tow depth, detecting a depth excursion from the tow depth, reducing an amplitude of the mass from the first amplitude to a second amplitude, preventing the mass from contacting at least one of the first end stop or the second end stop based on reducing the amplitude to the second amplitude, correcting the depth excursion to return the resonant seismic source to the tow depth, and increasing the amplitude from the second amplitude to produce the resonant frequency with the resonant seismic source at the tow depth.

    Seal and seal assembly for a fluid pressure pulse generating tool

    公开(公告)号:US10473804B2

    公开(公告)日:2019-11-12

    申请号:US15878750

    申请日:2018-01-24

    摘要: A seal and seal assembly for a fluid pressure pulse generating tool. The seal comprises an annular seal section comprising an internal sealing surface and an external sealing surface; and an annular heel section. The seal assembly comprises a seal assembly housing with a longitudinally extending bore therethrough for receiving a driveshaft of the tool and the seal enclosed by the seal assembly housing and configured to surround a portion of the driveshaft. The internal sealing surface of the seal is configured to be in sealing contact with the driveshaft and the external sealing surface of the seal is configured to be in sealing contact with an internal surface of the seal assembly housing. The annular heel section of the seal is configured to provide an interference fit with the driveshaft or with the internal surface of the seal assembly housing.

    Multi-frequency focusing acquisition and processing in wellbore logging

    公开(公告)号:US10459109B2

    公开(公告)日:2019-10-29

    申请号:US15755457

    申请日:2015-12-16

    摘要: The disclosed embodiments include systems and methods for multi-frequency focusing signal processing in wellbore logging. In one embodiment, the method includes obtaining a harmonic frequency set to evaluate a resistivity of a formation at a wellbore location, where the harmonic frequency set includes at least one harmonic frequency of a fundamental frequency. The method also includes selecting a waveform from a library of waveforms based on the obtained harmonic frequency set, where the library of waveforms includes a plurality of waveforms having different frequency spectrums. The selected waveform corresponds to a predicted conductivity of the formation. The method further includes generating, based on the selected waveform, a binary waveform for use in evaluating the resistivity of the formation at the wellbore location.

    Wide bandwidth borehole dipole source for acoustic logging

    公开(公告)号:US10288758B2

    公开(公告)日:2019-05-14

    申请号:US14406502

    申请日:2012-06-11

    摘要: A dipole source for borehole acoustic logging includes a cylindrical shell, a center beam coupled to the cylindrical shell, a movable projector inside the cylindrical shell to impact the center beam, and a cavity acoustically insulating the interior of the cylindrical shell from the exterior of the cylindrical shell. An acoustic logging tool for making measurements of a substrate surrounding a borehole with a body insertable in the borehole is also provided. The body includes an acoustic detector and a dipole source as above, along the axial length. The acoustic logging tool may include a control unit to process data collected from the acoustic detector and obtain information about the substrate surrounding the borehole.

    System and method of marine geophysical surveys with distributed seismic sources

    公开(公告)号:US10222499B2

    公开(公告)日:2019-03-05

    申请号:US15366641

    申请日:2016-12-01

    IPC分类号: G01V1/38 G01V1/04

    摘要: Marine geophysical surveys with distributed seismic sources. At least some of the example embodiments are methods including performing a marine geophysical survey by: towing a plurality of high-frequency sources spread along a width of an array of sensors, the high-frequency sources having a first source density with respect to the width; and towing a plurality of mid-frequency sources spread along the width, the mid-frequency sources have a second source density with respect to the width, the second source density lower than the first source density; and towing a low-frequency source along the width; activating the high-frequency, mid-frequency, and low-frequency sources.