公开(公告)号：US09841315B2

公开(公告)日：2017-12-12

申请号：US14983994

申请日：2015-12-30

申请人： Weatherford Technology Holdings, LLC

发明人： Domino Taverner ,  John J. Grunbeck ,  James R. Dunphy ,  Edward M. Dowd ,  David LaBella ,  Mark Baker ,  Andrew S. Kuczma ,  Francis X. Bostick, III

IPC分类号： G02B6/44 ,  G02B6/02 ,  E21B47/12 ,  G01H9/00

CPC分类号： G01H9/004 ,  E21B47/123 ,  G01V2210/1429 ,  G02B6/02342 ,  G02B6/02395 ,  G02B6/4433

摘要： Methods and apparatus for performing Distributed Acoustic Sensing (DAS) using fiber optics with increased acoustic sensitivity are provided. Acoustic sensing of a wellbore, pipeline, or other conduit/tube based on DAS may have increased acoustic sensitivity through fiber optic cable design and/or increasing the Rayleigh backscatter property of a fiber's optical core. Some embodiments may utilize a resonant sensor mechanism with a high Q coupled to the DAS device for increased acoustic sensitivity.

公开(公告)号：US10557963B2

公开(公告)日：2020-02-11

申请号：US15150501

申请日：2016-05-10

申请人： Weatherford Technology Holdings, LLC

发明人： Michael Lagace ,  David LaBella ,  Domino Taverner

IPC分类号： G01V8/00 ,  G01L9/00 ,  G01K11/32 ,  G01D5/353 ,  E21B47/12 ,  E21B47/10 ,  G02B6/36

摘要： Techniques and apparatus are provided for downhole sensing using optical couplers in a downhole splitter assembly to split interrogating light signals into multiple optical sensing branches. Each optical branch may then be coupled to an optical sensor (e.g., a pass-through or an optical single-ended transducer (OSET)) or to another optical coupler for additional branching. The sensors may be pressure/temperature (P/T) type transducers. Some systems may exclusively use OSETs as the optical sensors. In this manner, if one of the OSETs is damaged, it does not affect light traveling to any of the other sensors, and sensing information from remaining sensors is still returned.