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公开(公告)号：US20240241285A1
公开(公告)日：2024-07-18
申请号：US18560277
申请日：2022-07-18
申请人： PlotLogic Pty Ltd
发明人： Andrew Job , Michael Edgar , Marina Auad , Matthew Garlan
摘要： The present invention relates to a geological system. The system includes an apparatus for use when scanning an uneven geological surface and that need not contact the geological surface. The apparatus includes a light source for providing light. A reflector is provided for reflecting incident light onto the geological surface, and for reflecting reflected light from the geological surface. The apparatus also includes optical fibre means for receiving the reflected light from the reflector. The system includes moving means for moving the apparatus along the uneven geological surface during scanning. Advantageously, the apparatus does not require physical sampling of material along a hole, and may instead move along the hole at very fast speeds (typically up to between 2 to 4 m/s) whilst obtaining hyperspectral radiometric data. The apparatus may be low cost, and may include no radioactive materials, so that there is little concern or business interruption if it is lost down a hole.
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公开(公告)号：US11966005B2
公开(公告)日：2024-04-23
申请号：US16761658
申请日：2017-12-21
发明人： Daniel J. Stark , John L. Maida, Jr. , Li Gao
IPC分类号： G01V8/16 , E21B47/002 , E21B47/13
CPC分类号： G01V8/16 , E21B47/002 , E21B47/13
摘要： A telemetry system is disclosed for use in a wellbore extending from the surface. The telemetry system includes fiber optic cable locatable in the wellbore, the fiber optic cable including at least one optical fiber. The telemetry system also includes a telemetry device operable to transmit an optical telemetry signal over the fiber optic cable. An optical detector operably connected to the optical fiber and includes a single-photon detector operable to receive the optical telemetry signal transmitted over the optical fiber.
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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
申请人： Silixa Ltd.
IPC分类号： G01D5/353 , G01H9/00 , E21B47/135 , G01V8/16
CPC分类号： G01D5/3537 , G01D5/35306 , G01D5/35374 , G01H9/004 , E21B47/135 , G01V8/16
摘要： 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：US11525939B2
公开(公告)日：2022-12-13
申请号：US16925775
申请日：2020-07-10
发明人： Ammar Alali , Husain Nassir , Ezzedeen Alfataeirge
摘要： A system for monitoring downhole cement quality in a cased well includes an active acoustic source that generates acoustic waves, a distributed acoustic sensor, and a controller. The distributed acoustic sensor includes an optical fiber disposed on an outer surface of a casing of the cased well; a pulsed laser coupled to the optical fiber and that transmits pulses of laser light along the optical fiber; a sensor that detects light that is backscattered and reflected by the optical fiber; and a processor that controls the pulsed laser, receives signals from the sensor, and converts the signals into acoustic information. The controller receives the acoustic information from the processor and identifies well integrity loss.
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5.发明授权公开(公告)号：US11500122B2
公开(公告)日：2022-11-15
申请号：US17013983
申请日：2020-09-08
摘要： A system can calculate estimated strain data for a fracture in a geological formation at each of a plurality of selected locations detectable by a strain measurement device. The system can receive real strain data from the strain measurement device for the geological formation. The system can perform a linear inversion to determine a probable distribution of fluid volume and hydraulic fracture orientation in the geological formation based on the estimated strain data and real strain data. The system can determine adjustments for a fracturing operation based on the linear inversion.
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公开(公告)号：US11366275B2
公开(公告)日：2022-06-21
申请号：US16585543
申请日：2019-09-27
发明人： John Laureto Maida , Sudhir Kumar Gupta , Michel Joseph LeBlanc , Arabinda Misra , Ramon Hernandez Marti
摘要： A hybrid electro-optic (EO) wireline cable includes optical fibers strategically placed within to allow acoustic sensing methods as well as provide power and electrical telemetry. The hybrid EO wireline cable contains optical fibers in the interstices among symmetrically arranged electrical wire bundles to allow a hybrid EO cable to be concurrently used for electrical telemetry and optical fiber sensing without interference in a wellbore environment. This hybrid EO cable maintains electric and magnetic field symmetry which allows an optimal electrical signaling rate through orthogonal propagation modes. By placing optical fibers symmetrically inside the interstitial spaces between electrical wire bundles, the cable maintains its optimal signaling rate and avoids the mechanical and electrical limitations that would be introduced when combining electrical wires and optical fibers in a wireline cable.
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公开(公告)号：US20220170765A1
公开(公告)日：2022-06-02
申请号：US17599767
申请日：2020-03-19
申请人： NEC Corporation
发明人： Yutaka YANO , Eitaro MISUMI
IPC分类号： G01D5/353 , H04B10/071 , G01B11/16 , G01V8/16
摘要： A slight movement of the ground is detected. A cable, which includes an optical fiber, is provided to have friction with the ground in such a way that the optical fiber is expanded and contracted in accordance with the movement of the ground. An optical output unit outputs a monitoring light to the optical fiber. A partial reflection unit is provided on a path of the optical fiber in the cable and partially reflects the monitoring light. An optical reception unit receives a reflection light reflected by the partial reflection unit. A calculation unit measures the length of the optical fiber to the partial reflection unit based on a round-trip propagation time of the reflection light that has been received and monitors its changes over time.
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8.发明授权公开(公告)号：US11098575B2
公开(公告)日：2021-08-24
申请号：US16269011
申请日：2019-02-06
申请人： Brian C. Seabrook , Charles J. Mart , Ted A. Long
发明人： Brian C. Seabrook , Charles J. Mart , Ted A. Long
IPC分类号： E21B47/103 , G01V8/16 , G01V99/00 , G06F30/20 , G06F119/08 , E21B47/07 , E21B47/113 , E21B47/135
摘要： A method and apparatus are provided for determining movement of a fluid into or out of a subsurface wellbore, to thereby enable accurate allocation of fluids being produced by or injected into each of several zones of the wellbore. A temperature change is effected in the fluid at a first location in the wellbore. A temperature of the fluid is measured at one or more sensing locations downstream of the location of the temperature change. A simulated heat flow profile is generated from a wellbore model. The simulated heat flow profile is compared to the measured temperature of the fluid at the one or more sensing locations. An inversion model is used to determine, for a plurality of points of interest, a fluid flow direction and/or a cumulative flow rate contribution.
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公开(公告)号：US11048017B2
公开(公告)日：2021-06-29
申请号：US16326352
申请日：2016-08-26
IPC分类号： G01V8/16 , E21B47/07 , E21B47/017 , E21B47/135 , E21B49/00 , G01D5/353 , G02B6/42 , G01H9/00
摘要： In some embodiments, a method and apparatus, as well as an article, may operate to determine properties based on detected optical signals. An optical detection apparatus can include an optical detector for detecting light received through a fiber optic cable; a housing for enclosing the optical detector; a light source; and a cooling mechanism having the housing mounted thereto. The cooling mechanism can maintain the temperature of a light-sensitive region of the optical detector within a temperature range below 210 degrees Kelvin. Additional apparatus, systems, and methods are disclosed.
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公开(公告)号：US10683747B2
公开(公告)日：2020-06-16
申请号：US15767726
申请日：2015-12-31
摘要： A system includes a set of one or more electromagnetic (EM) field sensors deployed in a borehole formed in a downhole formation, wherein the set of EM field sensors provides sensitivity to EM fields. The system also includes an EM field source that emits an EM field into the downhole formation. The system also includes a data processing system that receives measurements collected by the set of EM field sensors in response to the emitted EM field. The data processing system models the subsurface EM field based on the received measurements and identifies a plurality of flood fronts corresponding to fluid approaching the borehole from the injection wells, and adjusts injection rates to prevent injection fluid breakthrough.
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