Method and apparatus for monitoring acoustic activity in a subsurface formation

摘要

A method and apparatus is disclosed for monitoring microseismic activity in a formation. The method and apparatus include placing a tool string having a shuttle including a sensor thereon in a stimulation well, and activating the shuttle to acoustically couple the sensor to an inner surface of a casing. The sensor is acoustically decoupled from the tool string. Fluid is then injected into the formation via the tool string. The sensor is reengaged with the tool string. The tool string may then be removed from the stimulation well or moved to another position along the wellbore.

主权项

1. A method of monitoring microseismic activity around a stimulation well, the method comprising:
activating a packer disposed at a lower end of the tool string to seal an annulus defined by the tool string and an inner casing surface; temporarily attaching at least one shuttle comprising a sensor able to detect microseismic events to the exterior of the tool string; activating the shuttle in the wellbore by acoustically coupling the sensor to the inner casing surface; physically detaching the sensor from the tool string so that the sensor is acoustically decoupled therefrom; hydraulic fracturing the formation via the tool string; recording microseismic data-via the sensor; and reattaching the sensor to the tool string.