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1. 发明申请

US20170343433A1 Optic Fibres and Fibre Optic Sensing 审中-公开
公开(公告)号：US20170343433A1
公开(公告)日：2017-11-30
申请号：US15620196
申请日：2017-06-12
申请人： Optasense Holdings Limited
发明人： David John Hill , Magnus McEwen-King , Roger Ian Crickmore
IPC分类号： G01L1/24 , G02B6/44 , G01L11/02 , G01H9/00 , G02B6/02 , G01D5/353 , G02B6/032
CPC分类号： G01L1/243 , G01D5/3538 , G01H9/004 , G01L11/025 , G01V1/208 , G01V1/52 , G02B6/02 , G02B6/443 , G02B2006/0325
摘要： Fiber optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fiber optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) surrounded by a jacket (204) and arranged so that the core is offset from the center of the cable. By offsetting the core from the center of the jacket any bending effects on the core can be maximized compared to the core being located at the center of the cable.

2. 发明授权

US11099085B2 Optic fibres and fibre optic sensing 有权
公开(公告)号：US11099085B2
公开(公告)日：2021-08-24
申请号：US15620196
申请日：2017-06-12
申请人： Optasense Holdings Limited
发明人： David John Hill , Magnus McEwen-King , Roger Ian Crickmore
IPC分类号： G01L1/24 , G02B6/02 , G01D5/353 , G01H9/00 , G01L11/02 , G02B6/44 , G02B6/032 , G01V1/52 , G01V1/20
摘要： Fiber optic cables with improved performance for use in distributed sensing, for instance in distributed acoustic sensors, are disclosed. In one embodiment a fiber optic cable (210) comprises a core (208) and cladding (206) disposed within a buffer material (202) surrounded by a jacket (204) and arranged so that the core is offset from the center of the cable. By offsetting the core from the center of the jacket any bending effects on the core can be maximized compared to the core being located at the center of the cable.

3. 发明授权

US09828849B2 Flow monitoring using fibre optic distributed acoustic sensors 有权
公开(公告)号：US09828849B2
公开(公告)日：2017-11-28
申请号：US14346437
申请日：2012-09-28
申请人： OPTASENSE HOLDINGS LIMITED
发明人： Alastair Godfrey , Roger Ian Crickmore
IPC分类号： E21B47/10 , G01F1/66 , G01F1/704
CPC分类号： E21B47/101 , E21B47/10 , G01F1/663 , G01F1/704
摘要： This application describes methods and apparatus for monitoring flow of fluids within conduits using fiber optic Distributed Acoustic Sensing (DAS). The method can determine flow rate and/or flow regime within a conduit such as within a production well or a pipeline. Embodiments involve introducing an acoustic stimulus (802) into the fluid within the conduit (801); interrogating an optical fiber (104) deployed along the path of the conduit to provide a DAS sensor; and analyzing the acoustic signals detected by a plurality of channels of the DAS sensor to determine at least one flow characteristic. Analyzing the acoustic signal comprises identifying reflections (804) of said acoustic stimulus caused by the fluid within the conduit and analyzing said reflections to determine any Doppler shift (Δf).

4. 发明申请

US20160123798A1 Improvements in Fibre Optic Distributed Sensing 审中-公开
标题翻译：光纤分布式传感器的改进
公开(公告)号：US20160123798A1
公开(公告)日：2016-05-05
申请号：US14898031
申请日：2014-06-27
申请人： OPTASENSE HOLDINGS LIMITED
发明人： Alastair Godfrey , Roger Ian Crickmore
IPC分类号： G01H9/00
CPC分类号： G01H9/004 , G01D5/35361
摘要： This application describes method and apparatus for fibre optic distributed acoustic sensing (DAS) that allow for quantitative estimation of relatively large and continuous stimuli acting on the sensing fibre. An optical fibre (101) is interrogated with optical pulse and the Rayleigh backscatter detected to provide a DAS sensor. The method involves identifying a first stimulus acting on at least one sensing portion of the optical fibre, which results in an effective optical path length change within said sensing portion of at least the wavelength of the optical radiation. Such a path length change will result in signal wrapping leading to an observed variation (401) in backscatter intensity. The frequency of variation is detected and can be used to estimate the rate of change of path length. The method can be used to estimate strain rate and/or rate of change of temperature.
摘要翻译：本申请描述了用于光纤分布式声学感测（DAS）的方法和装置，其允许定量估计作用在感测光纤上的相对较大和连续的刺激。光纤（101）被光脉冲询问，并检测到瑞利反向散射以提供DAS传感器。该方法包括识别作用在光纤的至少一个感测部分上的第一刺激，其导致所述感测部分内的至少波长的光辐射的有效光程长度变化。这种路径长度变化将导致信号缠绕，导致在后向散射强度中观察到的变化（401）。检测变化频率，并可用于估计路径长度的变化率。该方法可用于估计应变速率和/或温度变化率。

5. 发明授权

US10151626B2 Fibre optic distributed sensing 有权
公开(公告)号：US10151626B2
公开(公告)日：2018-12-11
申请号：US14898031
申请日：2014-06-27
申请人： OPTASENSE HOLDINGS LIMITED
发明人： Alastair Godfrey , Roger Ian Crickmore
IPC分类号： G01H9/00 , G01D5/353
摘要： This application describes method and apparatus for fiber optic distributed acoustic sensing (DAS) that allow for quantitative estimation of relatively large and continuous stimuli acting on the sensing fiber. An optical fiber (101) is interrogated with optical pulse and the Rayleigh backscatter detected to provide a DAS sensor. The method involves identifying a first stimulus acting on at least one sensing portion of the optical fiber, which results in an effective optical path length change within said sensing portion of at least the wavelength of the optical radiation. Such a path length change will result in signal wrapping leading to an observed variation (401) in backscatter intensity. The frequency of variation is detected and can be used to estimate the rate of change of path length. The method can be used to estimate strain rate and/or rate of change of temperature.

6. 发明申请

US20140216151A1 Flow Monitoring 有权
标题翻译：流量监测
公开(公告)号：US20140216151A1
公开(公告)日：2014-08-07
申请号：US14346437
申请日：2012-09-28
申请人： OPTASENSE HOLDINGS LIMITED
发明人： Alastair Godfrey , Roger Ian Crickmore
IPC分类号： E21B47/10
CPC分类号： E21B47/101 , E21B47/10 , G01F1/663 , G01F1/704
摘要： This application describes methods and apparatus for monitoring flow of fluids within conduits using fibre optic Distributed Acoustic Sensing (DAS). The method can determine flow rate and/or flow regime within a conduit such as within a production well or a pipeline. Embodiments involve introducing an acoustic stimulus (802) into the fluid within the conduit (801); interrogating an optical fibre (104) deployed along the path of the conduit to provide a DAS sensor; and analysing the acoustic signals detected by a plurality of channels of the DAS sensor to determine at least one flow characteristic. Analysing the acoustic signal comprises identifying reflections (804) of said acoustic stimulus caused by the fluid within the conduit and analysing said reflections to determine any Doppler shift (Δf).
摘要翻译：本申请描述了使用光纤分布式声学传感（DAS）监测管道内流体流动的方法和装置。该方法可以确定诸如在生产井或管道内的导管内的流速和/或流动状态。实施例涉及将声学刺激（802）引入到导管（801）内的流体中; 询问沿着导管的路径部署的光纤（104）以提供DAS传感器; 以及分析由DAS传感器的多个通道检测的声信号以确定至少一个流动特性。分析声信号包括识别由导管内的流体引起的所述声学刺激的反射（804），并分析所述反射以确定任何多普勒频移（＆Dgr; f）。

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