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公开(公告)号：US20190203574A1
公开(公告)日：2019-07-04
申请号：US16220332
申请日：2018-12-14
申请人： Xiaohua Yi , Mark M. Disko , Limin Song , David A. Howell
发明人： Xiaohua Yi , Mark M. Disko , Limin Song , David A. Howell
CPC分类号： E21B44/00 , E21B43/11 , E21B43/12 , E21B43/26 , E21B43/261 , E21B47/01 , E21B47/1005 , E21B47/101 , E21B47/122 , E21B47/16 , G01V1/288 , G01V2210/1234
摘要： Provided are methods and systems for monitoring and optimizing stimulation operations in a reservoir. In particular, the methods and systems utilize a downhole telemetry system, such as a network of sensors and downhole wireless communication nodes, to monitor various stimulation operations.
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公开(公告)号：US20180328163A1
公开(公告)日：2018-11-15
申请号：US15973839
申请日：2018-05-08
CPC分类号： E21B47/0005 , E21B47/101 , G01N29/041 , G01N29/11 , G01N29/42 , G01N2291/0232 , G01N2291/0427 , G01N2291/2636 , G01V1/48
摘要： Systems and methods are provided for obtaining a flexural-attenuation measurement for cement evaluation that may be effective even for wells with relatively thick casings. A method includes emitting an acoustic signal at a casing in a well that excites the casing into generating an acoustic response signal containing acoustic waves, such as Lamb waves. The Lamb waves include flexural waves and extensional waves. The casing may be relatively large, having a thickness of at least 16 mm. The acoustic response signal may be detected and filtered to reduce a relative contribution of the extensional waves. This may correspondingly increase a relative contribution of the flexural waves. The filtered acoustic response signal may be used as a flexural-attenuation measurement for cement evaluation.
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公开(公告)号：US10036242B2
公开(公告)日：2018-07-31
申请号：US14900752
申请日：2014-06-11
CPC分类号： E21B47/101 , E21B47/06 , E21B47/14
摘要： Fluid densities can be monitored in real-time in a wellbore, such as during downhole stimulation operations, using an acoustic pressure-sensing system. The measured acoustic signal can be used to determine pressure fluctuations of a fluid in non-laminar flow. An estimated density of the fluid can be calculated based on the pressure fluctuations of the fluid and a known flow rate of the fluid. The flow rate of the fluid can be known, such as when being held constant by surface equipment or when measured at the surface.
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公开(公告)号：US20180087370A1
公开(公告)日：2018-03-29
申请号：US15830807
申请日：2017-12-04
申请人： Daniel Finfer , Kjetil Johannessen
发明人： Daniel Finfer , Kjetil Johannessen
CPC分类号： E21B47/00 , E21B47/101 , E21B47/123 , G01H9/004 , G01V1/226
摘要： The invention relates to the use of distributed optical fibre sensors for distributed acoustic sensing, and in particular, modal analysis of distributed acoustic data obtained in-well to monitoring well integrity. By determining one or more acoustic modes corresponding to distributed speed of sound measurements within the wellbore, and analysing variations in the distributed speed of sound measurement it is possible to derive information relating to a formation and/or fluid in the wellbore.
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公开(公告)号：US20180058196A1
公开(公告)日：2018-03-01
申请号：US15797024
申请日：2017-10-30
CPC分类号： E21B47/101 , E21B47/14 , G01D5/35303 , G01D5/35325 , G01D5/35329 , G01D5/35358 , G01D5/35361 , G01H9/004 , G01V1/226 , G01V1/42 , G01V1/48 , G01V8/10
摘要： Systems and methods for distributed acoustic sensing based on coherent Rayleigh scattering are disclosed herein. A system comprises a pulse generator, an interferometer, a photo detector assembly, and an information handling system. The interferometer comprises a first and second optical switch each comprising a plurality of ports. The information handling system activates one port on each of the first and second optical switches so as to vary the optical path length of the interferometer. A method comprises splitting backscattered light from an optical pulse into a first portion and a second portion, activating one port of a first optical switch and one port of a second optical switch, sending the first portion into a first arm of an interferometer, sending the second portion into a second arm of the interferometer, combining the first and second portions to form an interferometric signal, and receiving the interferometric signal at a photodetector assembly.
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公开(公告)号：US20170329031A1
公开(公告)日：2017-11-16
申请号：US15533962
申请日：2015-08-28
发明人： Mark Vincent Collins
CPC分类号： G01V1/50 , E21B47/101 , E21B47/18 , E21B49/00 , G01V1/284 , G01V1/306 , G01V1/34 , G01V2210/47 , G01V2210/626 , G01V2210/74
摘要： An acoustic logging method includes obtaining first horizontal transverse isotropy (“HTI”) angles resulting from a time domain HTI algorithm. The method further includes obtaining one or more second HTI angles resulting from a frequency domain HTI algorithm. The method further includes generating a first HTI anisotropy log including a relative angle log based on the first and second HTI angles. The method further includes generating a first color map of the first HTI anisotropy log and displaying the first color map.
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7.发明授权公开(公告)号：US09784884B2
公开(公告)日：2017-10-10
申请号：US15111932
申请日：2015-09-04
发明人： Luis F. Quintero
CPC分类号： G01V11/002 , E21B47/0005 , E21B47/065 , E21B47/101 , E21B47/123 , G01H9/004 , G01V1/226 , G01V5/10
摘要： A gas presence and distance thereof are calculated using pulsed neutron data. A distance of a gas flow path and a velocity of the gas flow therein are calculated using distributed acoustic sensors. The gas saturation and distance, and gas velocity and distance obtained from the noise data are correlated to obtain a first calculated distance and velocity values. The distance and the velocity of the gas flow are calculated using distributed Doppler sensors. The distance and velocity values are compared with the first calculated distance and velocity values to obtain a second calculated distance and velocity values. The distance of the gas flow and the velocity of the gas flow are calculated using distributed temperature sensors. The distance and velocity values are compared with the second calculated distance and velocity values to determine a distance of a cement interface, and a velocity of a gas flow therein.
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公开(公告)号：US09777570B2
公开(公告)日：2017-10-03
申请号：US15009095
申请日：2016-01-28
发明人： Steve Braisher , Karl Edler , Martin Kanka
CPC分类号： E21B47/18 , E21B47/101 , E21B47/122
摘要： A system and method of transmitting measurement-while-drilling (MWD) data while drilling a wellbore in a subterranean formation are provided. The system utilizes a transmission sub located uphole of the drill bit which transmits an electromagnetic signal through the surrounding drilling fluid to a receiver assembly located farther uphole at a position suitable for relaying the signal to the surface.
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公开(公告)号：US20170275987A1
公开(公告)日：2017-09-28
申请号：US15079157
申请日：2016-03-24
CPC分类号： E21B47/1005 , E21B47/065 , E21B47/10 , E21B47/101 , G01B21/08 , G01N17/04
摘要： An integrated and rigless method of determining the location and the type of damage in casing or tubing of a wellbore that involves recording a thickness profile of the casing or tubing, a temperature log, and a noise log along the depth of the wellbore, followed by locating the damage from the thickness profile, and determining the type of damage from the temperature log and the noise log.
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公开(公告)号：US20170260848A1
公开(公告)日：2017-09-14
申请号：US15026873
申请日：2015-03-10
发明人： Hua Xia , Avinash V. Taware , David A. Barfoot
CPC分类号： E21B47/101 , E21B47/06 , E21B47/123 , E21B49/00 , G01H9/004 , G01V1/226 , G01V1/40 , G01V1/46 , G01V1/52 , G01V2210/161
摘要： A distributed acoustic sensing cable package having a polymer composite extruded over an optical waveguide to encase the waveguide and to form a crystalline matrix layer acoustically coupled to the waveguide. The crystalline matrix includes reinforcement fibers to further enhance transmission of a cable strain to the optical waveguide. During manufacture of the cable, the polymer composite may be extruded over the optical waveguide and subsequently subjected to heat treatment to increase the crystallinity of the polymer composite and increase the elastic modulus. Both axial and radial strain fields are effectively interact with cased fiber waveguide for producing measurable phase shift signal for distributed acoustic noise detection.
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