US 11,898,437 B2
Method and system for determining fluid level change using pressure monitoring of annular gas
Jianhui Xu, Dhahran (SA); Bodong Li, Dhahran (SA); Guodong Zhan, Dhahran (SA); Chinthaka P. Gooneratne, Dhahran (SA); Timothy Eric Moellendick, Dhahran (SA); and Graham Hitchcock, Westhill (GB)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Dec. 17, 2021, as Appl. No. 17/555,048.
Prior Publication US 2023/0193745 A1, Jun. 22, 2023
Int. Cl. E21B 47/047 (2012.01); E21B 33/127 (2006.01); E21B 33/06 (2006.01); E21B 47/06 (2012.01)
CPC E21B 47/047 (2020.05) [E21B 33/06 (2013.01); E21B 33/127 (2013.01); E21B 47/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method, comprising:
creating a chamber within an annulus between a wellbore casing and a drillpipe, wherein an upper boundary of the chamber comprises a seal and a lower boundary of the chamber comprises a liquid surface;
determining a volume of the chamber at a first time, wherein determining the volume of the chamber comprises:
measuring, using a pressure gauge, a first pressure within the chamber,
changing an amount of a gas in the chamber using a gas pump,
measuring, using the pressure gauge, a second pressure within the chamber,
determining a first volume of gas within the chamber based on the first and second pressure measurements and the change in the amount of gas, and
determining a first fluid level based on the first volume of the chamber.