methods for monitoring a borehole below hydraulic fracturing process, for hydraulic borehole fracturing, and for fracture mapping during a hydraulic fracturing process, borehole monitoring system, computer program product, and use of a sensor acoustic.

摘要

Methods and apparatus for downhole monitoring are provided by interrogating an unmodified optic fibre (102) arranged along the path of a well bore (106) to provide a distributed acoustic sensor and sampling data gathered from a plurality of contiguous sensing portions of the fibre. The sampled data is processed to determine one or more well bore parameters. The well bore parameters may comprise a well condition profile, and may be obtained in response to an acoustic stimulus.