US 11,753,927 B2
Collapse pressure in-situ tester
Khalid Mohammed Alruwaili, Dammam (SA); Murtadha J. AlTammar, Al Olaya (SA); and Khaqan Khan, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Nov. 23, 2021, as Appl. No. 17/456,325.
Prior Publication US 2023/0160296 A1, May 25, 2023
Int. Cl. E21B 47/06 (2012.01)
CPC E21B 47/06 (2013.01) 16 Claims
OG exemplary drawing
 
1. A method for determining a collapse pressure of a well using a drill stem test tool (DSTT), the method comprising:
deploying the DSTT via a drill string into a wellbore, the DSTT comprising a plurality of sensors;
isolating, using straddle packers, a zone of interest in the wellbore;
reducing and recording pressure inside the drill string which is in fluid communication with the wellbore;
recording acoustic emissions from the plurality of sensors disposed on the DSTT in the zone of interest while reducing pressure inside the drill string;
correlating the recordings of the acoustic emissions with the pressure inside the drill string;
processing, using a computer processor, the acoustic emissions;
using the processed acoustic emissions to determine a candidate sound of interest and a pressure at which the candidate sound of interest is recorded;
comparing the candidate sound of interest with a reference lookup table of known lithology classifications;
determining a lithology of the wellbore from the lookup table; and
determining a collapse pressure of the wellbore using the lithology of the wellbore and the pressure at which the candidate sound of interest is recorded.