CPC G01V 1/46 (2013.01) [G01L 19/0092 (2013.01); G01V 1/48 (2013.01); G01V 1/52 (2013.01); G01V 2001/526 (2013.01); G01V 2210/121 (2013.01); G01V 2210/1299 (2013.01); G01V 2210/1429 (2013.01); G01V 2210/54 (2013.01)] | 15 Claims |
1. A method of determining an am pressure in an annulus between an inner casing and an outer casing, comprising:
generating an acoustic pulse at an acoustic transducer disposed within the inner casing at a selected depth;
measuring, at a processor, a time of flight of the acoustic pulse to an inner surface of the inner casing;
determining, at the processor, an inner diameter of the inner casing from the time of flight;
a comparing, at the processor, the determined inner diameter to a known inner diameter for the inner casing at a known annulus pressure to determine the annulus pressure related to the determined inner diameter; and
detecting a flow of fluid from a formation into the annulus based on the annulus pressure.
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