80th EAGE Conference & Exhibition 2018

Opportunities presented by the energy transition

Date
11 - 14 June
Location
Copenhagen, Denmark
Registration
Closing soon
Call for papers
Closed

Fibre Optic Sensors in Surface and Borehole Geophysics

WS08

Monday 11 June 2018

Title: Fibre Optic Sensors in Surface and Borehole Geophysics
Room: B
Convenors: J. Musser (Total)
V. Lesnikov (Total)
M. Thompson (Equinor)
S. Soulas (BP)


Workshop Description

This workshop will provide an update on the use of fibre optic technologies in sensor design for geophysical applications, including surface and borehole seismic using discrete and distributed sensors.

Optical fibres have long been used in seismic data acquisition systems for digital data telemetry. Various technologies have been developed in recent years for fibre optic sensors, either as discrete elements or as distributed, continuous sensors, such as DAS in borehole applications. This workshop is intended as a forum for discussing recent developments in fibre optic sensors, cables and systems for surface and borehole seismic applications, as well as an opportunity to discuss best practices and ideas for other possible applications and solutions. In addition, discussions relating to aspects addressing the uptake of fibre optic technology, such as DAS deployment types, fibre integrity and long term reliability, implementation in subsea settings, high channel wetmate connectors for subsea and multi-fibre connectors for borehole applications, are also within the scope of this workshop.

The format of the workshop will feature formal presentations sharing technologies, experiences and lessons learned by invited speakers, as well as submitted papers from other participants. Following a selection of presentations, there will be round-table discussions to foster open dialogue and idea-sharing on current status and future directions for fibre optic sensing technology. Emphasis will be placed on applications to highlight the added value for proven and new methodologies and techniques.

Surface Sensors
The industry has seen a number of advances in fibre optic receiver technology in recent years. Fibre optic sensors have been developed for Ocean Bottom Seismology (OBS) and towed streamer applications and have a strong foothold in Permanent Reservoir Monitoring (PRM) systems. Fibre optic sensor designs include pressure sensors (hydrophones) and multicomponent particle velocity sensors (geophones), as well as accelerometers and displacement sensors. These all have some interesting characteristics, including advantages and disadvantages when compared to their electromechanical counterparts.

Borehole geophysical sensors
For borehole applications, various fibre optic sensor solutions have been introduced including distributed acoustic sensing (DAS) and discrete sensors for use in Vertical Seismic Profiling (VSP) and permanent monitoring in the borehole. Advances continue to be made in fibre optic cable design and interrogation systems. Fibre optic sensing is also widely used in wells for distributed temperature sensing (DTS), distributed pressure sensing, well and overburden integrity monitoring, sand influx monitoring, production profiling and new types of distributed measurements.

Future directions
Driven by the need for lower maintenance costs and more remote operations, developments in fibre optic sensing are rapidly gaining acceptance in the oil field. What other physical measurements can be made using fibre optic sensors? How can they be used to further improve operations in hazardous environments? What’s next?

 
Workshop Format 

The workshop format will include a combination of presentations and panel discussion.

 

Workshop Programme 

09:00 Opening  
Session: Context 
09:10 Seismic and Microseismic Detection Using a Wide Dynamic-range Distributed and Engineered Fiber Optic Acoustic Sensor
M. Farhadiroushan (Silixa)
09:35 Reservoir Monitoring through DAS Measurements
A. Chavarria (Optasense)
10:00 Discussion
10:15 Coffee break
Session: Learnings 
10:30 Vertical Seismic Profiling Combining Three-component Geophones with Single-axis DAS Sensors
J. Haldorsen* (READ), L. Jahren (READ), M. Milenkovic (READ), T. Hilton (READ)
10:55 Results from a Clair DAS VSP Pilot and Lessons Learned for DAS Surveillance on Clair Ridge
L. Saxton* (BP), M. Ball (BP), S. Soulas (BP), G. Zhan (BP), M. Webster (BP)
11:20 Comparative Study of DAS and Geophone VSP Data 
Y. Chen* (BGP), G. Yu (BGP/CNPC), Y.P. Li (BGP/CNPC), X.L. Guo (BGP/CNPC), J.H. Hyang (BGP/CNPC), J.J. Wu (BGP/CNPC)
11:45 Discussion
12:10 Lunch break 
Session: Engineering opportunities 
13:10 Continuous DAS VSP Monitoring Using Surface Orbital Vibrators - Field trials for optimal configuration at the CO2CRC Otway Project
J. Correa* (Curtin Univ.), B.M. Freifeld (Lawrence Berkeley National Laboratory), R. Pevzner (Curtin Univ.), T. Wood (Lawrence Berkeley National Laboratory), K. Tertyshnikov (Curtin Univ.), A. Bona (Curtin Univ.)
13:35 Looking Beyond Seismic Sensors - Engineering considerations for topside and subsea PRM interfaces
L.A. Woodhouse* (Equinor), H. Frøyshov (Equinor), M. Thompson (Equinor)
14:00 Discussion
14:15 Coffee break 
Session: Planning considerations
14:30 Optimising DAS VSP Data Acquisition Parameters - Theory and experiments at Curtin training well facility
R. Pevzner* (Curtin Univ.), A. Bona (Curtin Univ.), J. Correa (Curtin Univ.), K. Tertyshnikov (Curtin Univ.), G. Palmer (Fotech Solutions), O. Valishin (Sercel)
14:55 Effect of the Angular Response of a Fiber-optic Cable on DAS VSP Recordings in Lateral Wells 
M. Willis* (Halliburton), X. Wu (Halliburton), A. Padhi (Halliburton)
15:20 Discussion & Wrap-up
16:00 End of workshop 
 
Please note that this programme is subject to change.