摘要 |
The application describes method and apparatus for determining the relative orientation of objects downwell, and especially to determining perforator orientation. The method involves varying the orientation of an object, such as a perforator gun (303) in the wellbore (202) and activating at least one directional acoustic source (402a-c). Each directional acoustic source is fixed in a predetermined location to the object and transmits an acoustic signal preferentially in a known direction. The directional acoustic source(s) is/are activated so as to generate sound in a plurality of different orientations of said object. An optical fibre (104) deployed down the wellbore is interrogated to provide distributed acoustic sensing in the vicinity of the object; and the acoustic signals detected by the optical fibre are analysed so as to determine the orientation of the at least one directional acoustic source relative to the optical fibre, for instance by looking at the relative intensity in the different orientations. |