US 12,146,103 B1
Pressure injection method for recovering hydrocarbons
Shams Kalam, Dhahran (SA); Sidqi Ahmad Mohammad Abu-Khamsin, Dhahran (SA); Shirish Liladhar Patil, Dhahran (SA); and Muhammad Shahzad Kamal, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jul. 24, 2024, as Appl. No. 18/782,103.
Application 18/782,103 is a continuation of application No. 18/364,580, filed on Aug. 3, 2023.
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/584 (2006.01); C09K 8/588 (2006.01); E21B 43/16 (2006.01)
CPC C09K 8/584 (2013.01) [C09K 8/588 (2013.01); E21B 43/16 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A pressure injection method of enhanced oil recovery, comprising:
injecting a mixture into a carbonate rock formation comprising an oil composition at an injection pressure of 100-5,000 psi; and
extracting the oil composition from the carbonate rock formation,
wherein the mixture comprises 89-98.9 vol % of an aqueous solution, 0.01-1 vol % of a gemini cationic surfactant, and 0.1-10 vol % of formic acid based on a total volume of the mixture, and
wherein during the injecting at least a portion of the gemini cationic surfactant is adsorbed onto the carbonate rock formation, and wherein at least 90% less by volume of the gemini cationic surfactant adsorbs onto the carbonate rock formation compared to a method under the same conditions but without the formic acid.