METHOD AND APPARATUS FOR DOWNHOLE WELLBORE PLACEMENT

摘要

A method of drilling multiple wellbores in close proximity to one another involves providing a primary wellbore; equipped with a fiber Bragg grating sensor (FBG) line. The FBG sensor line extends along at least a portion of the primary wellbore. The method drills at least one secondary wellbore using a directional drill. Data from the FBG sensor line is processed to determine locations of acoustic sources corresponding to the directional drill relative to the FBG sensor line. Locations of the acoustic sources are used to compare a trajectory of the secondary wellbore to a desired trajectory. Corrections to the trajectory may be made as the secondary wellbore is drilled. The methods may be applied, for example, to drilling formations of wellbores for SAGD applications. Associated apparatus and computer program products are also described.