US 12,448,869 B2
CO2 operation temperature and pressure analysis and well design with CO2 modeling with equation of state method
Yongfeng Kang, Houston, TX (US); Adolfo Gonzales, Houston, TX (US); Robello Samuel, Houston, TX (US); and Zhengchun Liu, Houston, TX (US)
Assigned to Landmark Graphics Corporation, Houston, TX (US)
Appl. No. 17/607,545
Filed by Landmark Graphics Corporation, Houston, TX (US)
PCT Filed Jan. 29, 2020, PCT No. PCT/US2020/015660
§ 371(c)(1), (2) Date Oct. 29, 2021,
PCT Pub. No. WO2021/040783, PCT Pub. Date Mar. 4, 2021.
Claims priority of provisional application 62/891,108, filed on Aug. 23, 2019.
Prior Publication US 2022/0220830 A1, Jul. 14, 2022
Int. Cl. E21B 41/00 (2006.01); E21B 43/26 (2006.01); E21B 47/06 (2012.01)
CPC E21B 41/0064 (2013.01) [E21B 43/26 (2013.01); E21B 47/06 (2013.01); E21B 2200/20 (2020.05)] 20 Claims
OG exemplary drawing
 
1. A method of designing a casing string for an oil well, comprising:
modeling carbon dioxide (CO2) material by a thermodynamic modeling application using a carbon dioxide equation of state (EoS) to determine thermodynamic properties of the CO2 material, wherein the thermodynamic modeling application executes on a computer system;
providing the thermodynamic properties of the CO2 material by the thermodynamic modeling application to a downhole environment modeling application executing on the computer system, whereby the thermodynamic modeling application is integrated with the downhole environment modeling application;
determining temperatures of oil well components by the downhole environment modeling application at each of a plurality of points of a casing string design based in part on the thermodynamic properties of the CO2 material determined by the thermodynamic modeling application;
determining pressures in the casing string design by the downhole environment modeling application at each of the plurality of points of the casing string design based in part on the thermodynamic properties of the CO2 material determined by the thermodynamic modeling application;
providing the temperatures of oil well components and the pressures in the casing string design at each of the plurality of points of the casing string design by the downhole environment modeling application to a casing string strength analysis application executing on the computer system, whereby the downhole environment modeling application and the thermodynamic application are integrated with the casing string strength analysis application;
analyzing a plurality of safety factors of the casing string design based on the temperatures of oil well components and pressures in the casing string design during a CO2-based completion activity by the casing string strength analysis application, wherein the plurality of safety factors comprise a casing burst strength safety factor, a casing collapse strength safety factor, a casing axial strength safety factor, and a casing triaxial strength safety factor;
presenting safety factor reports by the casing string strength analysis application;
receiving input from a user to adapt at least one element of the casing string design;
reiterating the analyzing the plurality of safety factors of the casing string based on the adapted at least one element of the casing string design and based on the temperatures of oil well components and pressures in the casing string design during the CO2-based completion activity by the casing string strength analysis application, whereby to optimize the casing string design.