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公开(公告)号：US11702930B2
公开(公告)日：2023-07-18
申请号：US16944861
申请日：2020-07-31
CPC分类号： E21B47/095 , E21B43/26 , E21B47/06 , E21B47/18 , G01V1/307 , G01V1/364 , G01V1/50 , G01V2210/324
摘要： The present disclosure relates to a method and system for monitoring a wellbore object using a reflected pressure signal. The method discloses providing at least one pump for performing hydraulic fracturing or a source of hydraulic pulse so that pressure signal propagates along the wellbore and reflects from the borehole objects; providing pressure sensor at wellhead; preprocessing of registered reflected pressure signal and pump noise; transforming the registered reflected pressure signal and pump noise from the frequency domain into time-frequency representation with Short Time Fourier Transform (STFT), computing a pump noise mask; applying the pump noise mask to the STFT representation to obtain a filtered reflected pressure signal; processing of the filtered reflected pressure signal for determining the reflection time from the downhole object, calculating the depth of the downhole object from reflected pressure signal by multiplying of the reflection time by the pressure signal propagation velocity. This method allows to perform wellbore monitoring without stop of current operations.
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公开(公告)号：US20210032984A1
公开(公告)日：2021-02-04
申请号：US16944861
申请日：2020-07-31
摘要： The present disclosure relates to a method and system for monitoring a wellbore object using a reflected pressure signal. The method discloses providing at least one pump for performing hydraulic fracturing or a source of hydraulic pulse so that pressure signal propagates along the wellbore and reflects from the borehole objects; providing pressure sensor at wellhead; preprocessing of registered reflected pressure signal and pump noise; transforming the registered reflected pressure signal and pump noise from the frequency domain into time-frequency representation with Short Time Fourier Transform (STFT), computing a pump noise mask; applying the pump noise mask to the STFT representation to obtain a filtered reflected pressure signal; processing of the filtered reflected pressure signal for determining the reflection time from the downhole object, calculating the depth of the downhole object from reflected pressure signal by multiplying of the reflection time by the pressure signal propagation velocity. This method allows to perform wellbore monitoring without stop of current operations.
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公开(公告)号：US20230304395A1
公开(公告)日：2023-09-28
申请号：US18007316
申请日：2020-07-30
IPC分类号： E21B47/095 , E21B47/06 , E21B33/14
CPC分类号： E21B47/095 , E21B47/06 , E21B33/14 , E21B2200/20
摘要： The position of a droppable object (e.g., a cementing plug or drillpipe dart) in a cased wellbore may be determined in real time during a cementing operation. A pressure data acquisition system is installed at a wellsite and a pressure transducer is installed at the cementing head. As the droppable object travels through casing it encounters regions with a positive or a negative change of inner cross-sectional dimension. The droppable object generates a pressure pulse as it passes through the regions. The pressure pulse and associated reflections are detected by the pressure transducer, and the signals are processed mathematically by a Kalman filter to determine the current position of the droppable object.
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公开(公告)号：US12065925B2
公开(公告)日：2024-08-20
申请号：US17002130
申请日：2020-08-25
IPC分类号： E21B47/095 , E21B33/16 , E21B23/04
CPC分类号： E21B47/095 , E21B33/165 , E21B23/04
摘要： The position of a droppable object (e.g., a cementing plug or drillpipe dart) in a cased wellbore may be determined in real time during a cementing operation. A pressure data acquisition system is installed at a wellsite and a pressure transducer is installed at the wellhead. As the droppable object travels through casing it encounters regions with a positive or a negative change of inner cross-sectional dimension. The droppable object generates a pressure pulse as it passes through the regions. The pressure pulse and associated reflections are detected by the pressure transducer, and the signals are processed mathematically to determine the current position of the droppable object.
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公开(公告)号：US12006815B2
公开(公告)日：2024-06-11
申请号：US16944861
申请日：2020-07-31
CPC分类号： E21B47/095 , E21B43/26 , E21B47/06 , E21B47/18 , G01V1/307 , G01V1/364 , G01V1/50 , G01V2210/324
摘要： The present disclosure relates to a method and system for monitoring a wellbore object using a reflected pressure signal. The method discloses providing at least one pump for performing hydraulic fracturing or a source of hydraulic pulse so that pressure signal propagates along the wellbore and reflects from the borehole objects; providing pressure sensor at wellhead; preprocessing of registered reflected pressure signal and pump noise; transforming the registered reflected pressure signal and pump noise from the frequency domain into time-frequency representation with Short Time Fourier Transform (STFT), computing a pump noise mask; applying the pump noise mask to the STFT representation to obtain a filtered reflected pressure signal; processing of the filtered reflected pressure signal for determining the reflection time from the downhole object, calculating the depth of the downhole object from reflected pressure signal by multiplying of the reflection time by the pressure signal propagation velocity. This method allows to perform wellbore monitoring without stop of current operations.
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6.发明公开公开(公告)号：US20240035355A1
公开(公告)日：2024-02-01
申请号：US18256942
申请日：2020-12-14
发明人： Demid Valeryevich Demidov , Roman Vladimirovich Korkin , Andrey Vladimirovich Fedorov , Artem Valeryevich Kabannik
摘要： Methods for locating fluid interfaces in a cased wellbore include generating vibrations in the casing, thereby forming oscillations in the wellbore fluids and the casing. The oscillations are detected by a vibration detector. The oscillations are recorded by a data acquisition system. Mathematical processing of the oscillations by cepstrum analysis is performed to determine the depths of interfaces between fluids in the annulus. The methods may also be employed to determine the time at which a cement slurry begins to set and harden. The methods may be performed in real time.
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公开(公告)号：US11035223B2
公开(公告)日：2021-06-15
申请号：US16313925
申请日：2016-07-01
IPC分类号： E21B47/095 , E21B47/06 , G01V1/46 , E21B43/26 , E21B49/00
摘要： The proposed method relates to hydrocarbon production, particularly to the monitoring of well operations by way of data analysis based on the cepstral analysis of the well pressure data recorded at the wellhead. The method assumes the detection of a hydraulic signal-reflecting object in the well, wherein: a fluid-filled well is provided with fluid enabling propagation of a hydraulic signal; a hydraulic signal source is provided, said source being in fluid communication with the well and designed to generate a hydraulic signal; a pressure sensor is provided, said pressure sensor records the hydraulic signal and being in fluid communication with the well and at least one hydraulic signal source. The hydraulic signal is recorded with the pressure sensor during well operations, and a pressure cepstrogram is obtained and an intense signal is found on the pressure cepstrogram. Then the position of object reflecting the hydraulic signal is detected in the well. A system is proposed for constructing a pressure cepstrogram and detecting a downhole object.
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公开(公告)号：US20210032978A1
公开(公告)日：2021-02-04
申请号：US16944663
申请日：2020-07-31
IPC分类号： E21B47/04 , G01B5/18 , E21B43/26 , E21B47/06 , E21B47/095
摘要： This disclose relates to a robust method for automatic real-time monitoring or post-job evaluation of hydraulic fracturing operations based on predictive deconvolution of the wellhead pressure oscillations. Described are a method and system for determining depth of wellbore reflectors, implemented by performing a wellbore operation producing a pressure wave and its reflections from the wellbore reflectors; registering a pressure wave and its reflections; preprocessing the registered pressure wave and its reflections with a bandwidth filter; transforming the registered pressure wave and its reflections from the frequency domain into time-frequency representation with Short Time Fourier Transform (STFT); applying of a predictive deconvolution filter to STFT representation; identifying of a reflected signal on a plot in coordinates “reflection time—physical time” and determining the reflection time for the signal reflected from the wellbore reflector; determining the depth of wellbore reflector by multiplying the reflection time by pressure wave speed.
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