公开(公告)号：WO2020154040A1

公开(公告)日：2020-07-30

申请号：PCT/US2019/064111

申请日：2019-12-03

Applicant: BAKER HUGHES, A GE COMPANY, LLC

Inventor： BISHOP, David ,  RIVERO, Carlos Felipe ,  FREEMAN, James J. ,  STEINSIEK, Roger ,  SAMUELSON, Marc ,  RAHMAN, Shaela ,  HARRIS, Jason

IPC: E21B47/06 ,  E21B47/08 ,  G01L9/00

Abstract: A method and apparatus for determining a pressure in an annulus between an inner casing and an outer casing. An acoustic transducer is disposed within the casing at a selected depth within the inner casing and is configured to generate an acoustic pulse and receive a reflection of the acoustic pulse from the inner casing. A time of flight is measured of the acoustic pulse to the inner surface of the inner casing. An inner diameter of the inner casing is determined from the time of flight. The pressure in the annulus is determined from the inner diameter. A processor can be used to measure time and determine inner diameter and annulus pressure.