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公开(公告)号：US11643920B2
公开(公告)日：2023-05-09
申请号：US17649324
申请日：2022-01-28
IPC分类号： E21B47/002 , E21B47/125 , E21B47/026 , G01V3/20
CPC分类号： E21B47/0025 , E21B47/026 , E21B47/125 , G01V3/20
摘要： A method includes deploying a logging tool in a borehole formed in a subsurface formation, the logging tool having a transmitter and a receiver, wherein a condition that is present during logging comprises at least one of a shape of the borehole is non-circular and the logging tool is off-center within the borehole. The method includes emitting, by the transmitter, a signal into subsurface formation and detecting, by the receiver, a response to the signal being propagated through the subsurface formation. The method includes creating, from the response, a borehole image that includes features in the subsurface formation and correcting the features, wherein correcting the features comprises mapping points of a non-circular shape in the borehole image into a plane substantially perpendicular to an axis of the borehole.
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公开(公告)号：US10983238B2
公开(公告)日：2021-04-20
申请号：US15546982
申请日：2016-09-26
发明人： Nam Nguyen , Yi Yang Ang , Srinivasan Jagannathan , Avinash Taware , Darren Philip Walters , Freeman Hill
IPC分类号： G01V1/50 , E21B47/107 , G01V1/30 , G01V1/42
摘要： A passive array of acoustic sensors capture acoustic signals produced by sand movement. The array tool is deployed downhole where it passively listens for acoustic energy generated by sand movement in the well. Once acoustic signals are acquired, model-based frameworks are used to extract single and multiple sensor features from the acoustic signals. The extracted features are used as signatures to detect or classify the production of sand.
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公开(公告)号：US10760410B2
公开(公告)日：2020-09-01
申请号：US15759436
申请日：2015-10-08
发明人： Nam Nguyen , Yi Yang Ang , Yinghui Lu , Avinash Vinayak Taware , Paris Smaragdis , David Alan Welsh , Nugroho Perhatianto
摘要： Various apparatus or methods are arranged to operate a tool in a wellbore, where the tool has a number of acoustic sensors. Scanning images obtained by the tool sensors along the borehole can be combined to increase the contrast of leak location with respect to background noise. A sequence of beamformed images, generated from signals captured by the tool as it moves over a range of depths of the wellbore, can be acquired. Each beamformed image may overlap at least one other beamformed image of the sequence. The beamformed images can be processed and the processed beamformed images can be combined, forming a stitched image. Additional apparatus, systems, and methods operable in providing stitched images can operate in a variety of applications.
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公开(公告)号：US10359525B2
公开(公告)日：2019-07-23
申请号：US15319974
申请日：2016-08-11
摘要： A method including selecting a forward model based on a modeled well structure and including a single modeled acoustic source located in a modeled wellbore and a plurality of modeled acoustic sensors located in a modeled source area, simulating an acoustic signal generated by the single modeled acoustic source and received by each modeled acoustic sensor, calculating phases of the simulated acoustic signals received at each modeled acoustic sensor, obtaining with a principle of reciprocity a plurality of modeled acoustic sources in the modeled source area and a single modeled acoustic sensor in the modeled wellbore, calculating phase delays of the simulated acoustic signals between each modeled acoustic source and the single modeled acoustic sensor, detecting acoustic signals generated by a flow of fluid using acoustic sensors in a wellbore, and processing the acoustic signals using the phase delays to generate a flow likelihood map.
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公开(公告)号：US11578588B2
公开(公告)日：2023-02-14
申请号：US15781923
申请日：2016-07-12
发明人： Nam Nguyen , Yi Yang Ang , Rebecca Corina Jachmann , Yinghui Lu , Srinivasan Jagannanthan , Avinash Vinayak Taware
IPC分类号： E21B47/107 , G01V1/40 , G01H17/00
摘要： Disclosed are systems and methods for processing broadband acoustic signals acquired by a plurality of acoustic sensors, using an array-signal-processing technique to compute fused-signal maps in the frequency domain for a plurality of frequency bins. In accordance with various embodiments, the fused-signal maps are combined across the frequency bins, with respective weightings that are based on eigenvalues of covariance matrices computed for the plurality of frequency bins. The combined maps can be used to locate an acoustic source in a wellbore.
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公开(公告)号：US11442188B2
公开(公告)日：2022-09-13
申请号：US16488676
申请日：2019-03-28
摘要： A method for imaging a downhole formation. The method includes combining the captured images to generate a partial image of the formation, wherein the partial image includes captured images separated by gaps representing portions of the formation not captured with sensors what were disposed downhole. The method includes locating dips in the formation within the partial image and interpolating the partial image using the located dips within the partial image.
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公开(公告)号：US20180355712A1
公开(公告)日：2018-12-13
申请号：US15781923
申请日：2016-07-12
发明人： Nam Nguyen , Yi Yang Ang , Rebecca Corina Jachmann , Yinghui Lu , Srinivasan Jagannanthan , Avinash Vinayak Taware
CPC分类号： E21B47/101 , G01H17/00 , G01V1/40
摘要： Disclosed are systems and methods for processing broadband acoustic signals acquired by a plurality of acoustic sensors, using an array-signal-processing technique to compute fused-signal maps in the frequency domain for a plurality of frequency bins. In accordance with various embodiments, the fused-signal maps are combined across the frequency bins, with respective weightings that are based on eigenvalues of covariance matrices computed for the plurality of frequency bins. The combined maps can be used to locate an acoustic source in a wellbore.
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公开(公告)号：US20180248584A1
公开(公告)日：2018-08-30
申请号：US15755227
申请日：2015-11-19
发明人： Nam Nguyen , Colin Koo
CPC分类号： H04B3/46 , E21B41/0085 , E21B47/12 , H04B3/54 , H04B2203/5412 , H04B2203/5475 , H04B2203/5483
摘要： A well tool for use in a wellbore can include a motor for performing a well operation. The well tool can include a switch that is couplable between the motor and a wireline. The switch can be toggleable between (i) a first operational state for providing the power to the motor by coupling the motor to an external power source and (ii) a second operational state for decoupling the motor from the external power source. The well tool can include a motor controller coupled to the switch for toggling the switch between the first operational state and the second operational state in an arrangement configured to impart, on the wireline, multiple current pulses including data encoded in the current pulses according to an encoding scheme.
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公开(公告)号：US20170269243A1
公开(公告)日：2017-09-21
申请号：US15319974
申请日：2016-08-11
CPC分类号： G01V1/282 , E21B47/101 , E21B47/14 , G01V1/288 , G01V1/308 , G01V1/40 , G01V1/42 , G01V1/50 , G01V2200/16 , G01V2210/123 , G01V2210/1234 , G01V2210/1299 , G01V2210/1429 , G01V2210/55 , G01V2210/614 , G01V2210/644 , G01V2210/673
摘要： A method including selecting a forward model based on a modeled well structure and including a single modeled acoustic source located in a modeled wellbore and a plurality of modeled acoustic sensors located in a modeled source area, simulating an acoustic signal generated by the single modeled acoustic source and received by each modeled acoustic sensor, calculating phases of the simulated acoustic signals received at each modeled acoustic sensor, obtaining with a principle of reciprocity a plurality of modeled acoustic sources in the modeled source area and a single modeled acoustic sensor in the modeled wellbore, calculating phase delays of the simulated acoustic signals between each modeled acoustic source and the single modeled acoustic sensor, detecting acoustic signals generated by a flow of fluid using acoustic sensors in a wellbore, and processing the acoustic signals using the phase delays to generate a flow likelihood map.
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10.发明授权公开(公告)号：US11655707B2
公开(公告)日：2023-05-23
申请号：US16645093
申请日：2017-12-29
发明人： Yi Yang Ang , Nam Nguyen , Joni Polili Lie , Yinghui Lu
IPC分类号： G01V11/00 , E21B47/107 , E21B47/117 , E21B47/113 , E21B47/12
CPC分类号： G01V11/002 , E21B47/107 , E21B47/113 , E21B47/117 , E21B47/12
摘要： The disclosed embodiments include a method of downhole leak detection. The method of downhole leak detection includes obtaining physical signals detected by at least one physical sensor traveling along a wellbore. Additionally, the method includes detecting correlated sequences from the physical signals and constructing a covariance matrix based on the correlated sequences. The method also includes computing a spatial spectrum indicative of a location of a leak based on the covariance matrix.
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