Subsurface Monitoring Using Distributed Acoustic Sensors
First Claim
1. A method of geophysical monitoring within a wellbore comprising interrogating an optical fibre deployed along substantially the entire length of the wellbore to provide distributed acoustic sensing and detecting the acoustic response from substantially the entire length of the wellbore in response to a seismic stimulus.
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Abstract
This application relates to methods and apparatus for geophysical monitoring within wellbores. The method involves interrogating an optical fibre (106) deployed along substantially the entire length of the wellbore (201) to provide distributed acoustic sensing and detecting the acoustic response from substantially the entire length of the wellbore in response to a seismic stimulus (204). The acoustic returns from individual sensing portions of the optical fibre can be processed to provide a profile such as a vertical seismic profile (VSP). An acoustic response from the entire length of the well can be recorded using a single shot of the seismic source.
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Citations
22 Claims
- 1. A method of geophysical monitoring within a wellbore comprising interrogating an optical fibre deployed along substantially the entire length of the wellbore to provide distributed acoustic sensing and detecting the acoustic response from substantially the entire length of the wellbore in response to a seismic stimulus.
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20. An apparatus for geophysical monitoring in a wellbore comprising an optical fibre deployed along substantially the entire length of the wellbore;
- a source of electromagnetic radiation configured to launch electromagnetic radiation into said fibre;
a detector for detecting electromagnetic radiation back-scattered from said fibre; and
a processor configured to;
analyse the back-scattered radiation to determine a measurement signal for a plurality of discrete longitudinal sensing portions of the optic fibre and analyses said measurement signals to detect incident seismic signals. - View Dependent Claims (21)
- a source of electromagnetic radiation configured to launch electromagnetic radiation into said fibre;
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22. (canceled)
Specification