US 11,697,983 B2
Producing hydrocarbons with carbon dioxide and water injection through stacked lateral dual injection
AbdulAziz Salah AlKhateeb, Al Khobar (SA); Amar Jaber M. Alshehri, Dhahran (SA); Surajit Haldar, Udhailiyah (SA); and Fahmi Aulia, Udhailiyah (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Aug. 10, 2020, as Appl. No. 16/989,382.
Prior Publication US 2022/0042404 A1, Feb. 10, 2022
Int. Cl. E21B 43/16 (2006.01); E21B 43/20 (2006.01); E21B 43/30 (2006.01)
CPC E21B 43/164 (2013.01) [E21B 43/20 (2013.01); E21B 43/305 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method comprising:
forming a first well at a first depth within a geologic formation, wherein the first well comprises a first horizontal portion, and wherein the first well is configured to act as a production well or as an injection well;
forming a second well at a second depth within the geologic formation, wherein the second depth is four hundred feet above the first depth, wherein the second well comprises a second horizontal portion that is parallel to the first horizontal portion, and wherein the second well is configured to act as a production well or as an injection well;
during a first three-month period of time:
injecting first CO2 into the geologic formation through the first well to sweep first hydrocarbons within the geologic formation upward towards the second well,
producing first production fluids from the geologic formation through the second well, the first production fluids comprising the first hydrocarbons, and
separating second CO2 from the first production fluids;
during a second three-month period of time occurring after the first three-month period of time:
injecting water into the geologic formation through the first well to sweep second hydrocarbons within the geologic formation upward towards the second well, and
producing the second hydrocarbons from the geologic formation through the second well;
during a third three-month period of time occurring after the second three-month period of time:
injecting the second CO2 into the geologic formation through the second well to sweep third hydrocarbons within the geologic formation downward towards the first well,
producing second production fluids from the geologic formation through the first well, the second production fluids comprising the third hydrocarbons, and
separating third CO2 from the second production fluids; and
during a fourth three-month period of time occurring after the third three-month period of time, injecting the third CO2 into the geologic formation through the first well to sweep fourth hydrocarbons within the geologic formation upward towards the second well.