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公开(公告)号：US20160223389A1
公开(公告)日：2016-08-04
申请号：US15021319
申请日：2014-09-04
Applicant: SILIXA LTD.
Inventor： Mahmoud Farhadiroushan , Daniel Finfer , Dmitry Strusevich , Sergey Shatalin , Tom Parker
CPC classification number: G01H9/004 , G01L1/242 , G01M7/00 , G02B6/4405 , G02B6/4415
Abstract: Embodiments of the present invention address aliasing problems by providing a plurality of discrete acoustic sensors along a cable whereby acoustic signals may be measured in situations where the fibre optic cable has not been secured to a structure or area by a series of clamps, as described in the prior art. Acoustic sampling points are achieved by selectively enhancing the acoustic coupling between the outer layer and the at least one optical fibre arrangement, such that acoustic energy may be transmitted selectively from the outer layer to the at least one optical fibre arrangement. The resulting regions of acoustic coupling along the cable allow the optical fibre to detect acoustic signals. Regions between the outer layer and the at least one optical fibre arrangement that contain material which is acoustically insulating further this enhancement since acoustic waves are unable to travel through such mediums, or at least travel through such mediums at a reduced rate.
Abstract translation: 本发明的实施例通过沿着电缆提供多个离散的声学传感器来解决混叠问题，从而可以在光纤电缆未通过一系列夹具固定到结构或区域的情况下测量声信号，如 现有技术 通过选择性地增强外层和至少一个光纤布置之间的声耦合来实现声学采样点，使得声能可以从外层选择性地传输到至少一个光纤装置。 所产生的沿着电缆的声耦合区域允许光纤检测声信号。 外层和至少一个光纤布置之间的区域包含进一步声学绝缘的材料，因为声波不能穿过这种介质，或至少以降低的速率行进通过这种介质。
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公开(公告)号：US20140126325A1
公开(公告)日：2014-05-08
申请号：US14070802
申请日：2013-11-04
Applicant: Silixa Ltd.
Inventor： Mahmoud Farhadiroushan , Tom Parker , Daniel Finfer
IPC: G01V1/30
CPC classification number: G01V11/00 , E21B47/123 , G01V1/226 , G01V1/40 , G01V2210/1429 , G01V2210/6161 , G01V2210/644
Abstract: Embodiments of the present invention help in the processing and interpretation of seismic survey data, by correlating or otherwise comparing or associating seismic data obtained from a seismic survey with flow information obtained from a well or borehole in the surveyed area. In particular, embodiments of the present invention allow for flow data representing a flow profile along a well that is being monitored by a distributed acoustic sensor to be determined, such that regions of higher flow in the well can be determined. For example, in the production zone the well will be perforated to allow oil to enter the well, but it has not previously been possible to determine accurately where in the production zone the oil is entering the well. However, by determining a flow rate profile along the well using the i)AS then this provides information as to where in the perforated production zone oil is entering the well, and hence the location of oil bearing sands. This location can then be combined or otherwise correlated, used, or associated with petroleum reservoir location information obtained from the seismic survey, to improve the confidence and/or accuracy in the determined petroleum reservoir location.
Abstract translation: 本发明的实施例通过将从地震勘测获得的地震数据与从被测区域中的井或井眼获得的流量信息进行关联或以其他方式比较或相关联来帮助处理和解释地震勘测数据。 特别地，本发明的实施例允许流动数据表示沿着正在被待确定的分布式声学传感器监测的井的流动分布，使得能够确定井中较高流量的区域。 例如，在生产区域中，井将被穿孔以允许油进入井，但是以前不可能准确地确定在生产区中油在哪里进入井。 然而，通过使用i）AS确定沿着井的流量分布，则这提供关于穿孔生产区油在进入井的位置以及因此提供含油砂的位置的信息。 然后可以将该位置组合或以其他方式相关联，使用或与从地震勘测获得的石油储层位置信息相关联，以提高确定的石油储层位置的置信度和/或准确度。
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公开(公告)号：US20230314189A1
公开(公告)日：2023-10-05
申请号：US18209569
申请日：2023-06-14
Applicant: Silixa Ltd.
Inventor： Mahmoud Farhadiroushan , Tom Parker , Sergey Shatalin
CPC classification number: G01D5/3537 , G01H9/004 , G01D5/35306 , G01D5/35374 , E21B47/135
Abstract: An optical fiber distributed acoustic sensor system makes use of a specially designed optical fiber to improve overall sensitivity of the system by a factor in excess of 10. This is achieved by inserting into the fiber weak broadband reflectors periodically along the fiber. The reflectors reflect a small proportion of the light from the DAS incident thereon back along the fiber, typically in the region of 0.001% to 0.1%. To allow for temperate compensation to ensure that the same reflectivity is obtained if the temperature changes, the reflection bandwidth is relatively broadband. The reflectors are formed from a series of fiber Bragg gratings, each with a different center reflecting frequency, the reflecting frequencies and bandwidths of the gratings being selected to provide the broadband reflection. The reflectors are spaced at the desired spatial resolution of the optical fiber DAS.
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公开(公告)号：US11719560B2
公开(公告)日：2023-08-08
申请号：US16934189
申请日：2020-07-21
Applicant: Silixa Ltd.
Inventor： Mahmoud Farhadiroushan , Tom Parker , Sergey Shatalin
IPC: G01D5/353 , G01H9/00 , E21B47/135 , G01V8/16
CPC classification number: G01D5/3537 , G01D5/35306 , G01D5/35374 , G01H9/004 , E21B47/135 , G01V8/16
Abstract: An optical fiber distributed acoustic sensor system makes use of a specially designed optical fiber to improve overall sensitivity of the system by a factor in excess of 10. This is achieved by inserting into the fiber weak broadband reflectors periodically along the fiber. The reflectors reflect a small proportion of the light from the DAS incident thereon back along the fiber, typically in the region of 0.001% to 0.1%. To allow for temperate compensation to ensure that the same reflectivity is obtained if the temperature changes, the reflection bandwidth is relatively broadband. The reflectors are formed from a series of fiber Bragg gratings, each with a different center reflecting frequency, the reflecting frequencies and bandwidths of the gratings being selected to provide the broadband reflection. The reflectors are spaced at the desired spatial resolution of the optical fiber DAS.
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公开(公告)号：US20210072190A1
公开(公告)日：2021-03-11
申请号：US17102221
申请日：2020-11-23
Applicant: Silixa Ltd , Chevron U.S.A. Inc.
Inventor： Mohammad Amir , Mahmoud Farhadiroushan , Daniel Finfer , Veronique Mahue , Tom Parker
Abstract: Embodiments of the invention provide a “tool-kit” of processing techniques which can be employed in different combinations depending on the circumstances. For example, flow speed can be found using eddy tracking techniques, or by using speed of sound measurements. Moreover, composition can be found by using speed of sound measurements and also by looking for turning points in the k-w curves, particularly in stratified multi-phase flows. Different combinations of the embodiments can therefore be put together to provide further embodiments, to meet particular flow sensing requirements, both on the surface and downhole. Once the flow speed is known, then at least in the case of a single phase flow, the flow speed can be multiplied by the interior cross-sectional area of the pipe to obtain the flow rate. The mass flow rate can then be obtained if the density of the fluid is known, once the composition has been determined.
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Patent Agency Ranking
公开(公告)号：US10677642B2
公开(公告)日：2020-06-09
申请号：US15507111
申请日：2015-08-20
Applicant: Silixa Ltd.
Inventor： Mahmoud Farhadiroushan , Veronique Mahue , Tom Parker , Sergey Shatalin
Abstract: A prefabricated mat-like structure having lengths of fiber mounted thereon or therein in a predetermined deployment pattern that provides a high spatial density of fiber to give increased spatial sensing resolution is described. The prefabricated mat-like structures may be very easily deployed by being placed against and/or wrapped around an object to be monitored, typically being fastened in place by clamps or the like. In addition, easy removal from the object is also obtained, by simply unfastening the mat-like structure, which may then be redeployed elsewhere. The prefabricated mat-like structure having the fiber already mounted thereon or therein therefore provides a very convenient and easily installable and removable solution.
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公开(公告)号：US20200072995A1
公开(公告)日：2020-03-05
申请号：US16553279
申请日：2019-08-28
Applicant: Silixa Ltd.
Inventor： Craig Milne , Pete Richter , Glynn Williams , Craig Woerpel
Abstract: The high sensitivity provided by an enhanced DAS system comprising a DAS interrogator and a high reflectivity fiber allows for the deployment of such a high reflectivity fiber as part of a wireline intervention cable which can be temporarily lowered into a well, thus avoiding the need to permanently cement such a high reflectivity optical fiber cable into the well. Instead, such a wireline cable incorporating the high reflectivity optical fiber has been found to be sensitive enough to detect micro-seismic activity and low frequency strain with many more measurement points and channels than conventional wireline deployed geophones and tiltmeters. Additionally, the cable requires no clamping and can be easily and quickly removed from one well and placed in another well.
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公开(公告)号：US10444392B2
公开(公告)日：2019-10-15
申请号：US15311425
申请日：2015-05-15
Applicant: Silixa Ltd.
Inventor： Craig Milne , Brian Frankey , Tom Parker , Mahmoud Farhadiroushan
IPC: G01V1/00 , G01V1/46 , E21B47/022 , G01V1/44 , G01V11/00 , E21B47/09 , G01D5/14 , G01V1/22 , E21B43/116
Abstract: A downhole device is provided that is intended to be co-located with an optical fiber cable to be found, for example by being fixed together in the same clamp. The device has an accelerometer or other suitable orientation determining means that is able to determine its positional orientation, with respect to gravity. A vibrator or other sounder is provided, that outputs the positional orientation information as a suitable encoded and modulated acoustic signal. A fiber optic distributed acoustic sensor deployed in the vicinity of the downhole device detects the acoustic signal and transmits it back to the surface, where it is demodulated and decoded to obtain the positional orientation information. Given that the device is co-located with the optical fiber the position of the fiber can then be inferred. As explained above, detecting the fiber position is important during perforation operations, so that the fiber is not inadvertently damaged.
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公开(公告)号：US10048115B2
公开(公告)日：2018-08-14
申请号：US15277347
申请日：2016-09-27
Applicant: Silixa Ltd.
Inventor： Mahmoud Farhadiroushan , Tom Richard Parker , Sergey Shatalin
Abstract: An interferometer apparatus for an optical fiber system and method of use is described. The interferometer comprises an optical coupler and optical fibers which define first and second optical paths. Light propagating in the first and second optical paths is reflected back to the optical coupler to generate an interference signal. First, second and third interference signal components are directed towards respective first, second and third photodetectors. The third photodetector is connected to the coupler via a non-reciprocal optical device and is configured to measure the intensity of the third interference signal component directed back towards the input fiber. Methods of use in applications to monitoring acoustic perturbations and a calibration method are described.
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公开(公告)号：US09804021B2
公开(公告)日：2017-10-31
申请号：US15048315
申请日：2016-02-19
Applicant: Silixa Ltd.
Inventor： Mahmoud Farhadiroushan , Tom Richard Parker , Sergey Shatalin
CPC classification number: G01H9/004 , E21B47/0002 , E21B47/101 , G01D5/35303 , G01D5/35306 , G01D5/35325 , G01D5/35335 , G01D5/35358 , G01D5/35364 , G01D5/35377 , G01D5/35383 , G01F1/66 , G01F1/661 , G01M11/331 , G01V1/40
Abstract: Apparatus and methods for fast quantitative measurement of perturbation of optical fields transmitted, reflected and/or scattered along a length of an optical fibre can be used for point sensors as well as distributed sensors or the combination of both. In particular, this technique can be applied to distributed sensors while extending dramatically the speed and sensitivity to allow the detection of acoustic perturbations anywhere along a length of an optical fibre while achieving fine spatial resolution. Advantages of this technique include a broad range of acoustic sensing and imaging applications. Typical uses are for monitoring oil and gas wells such as for distributed flow metering and/or imaging, seismic imaging, monitoring long cables and pipelines, imaging within large vessel as well as for security applications.
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