Producing hydrocarbons with carbon dioxide and water injection through stacked lateral dual injection

A method of producing hydrocarbons from a geologic formation, the method comprising:

• during a first three-month period of time:
• injecting first CO2 into the geologic formation through a first well to sweep first hydrocarbons within the geologic formation upward, the first well comprising a first horizontal portion located at a first depth within the geologic formation,
• producing first production fluids from the geologic formation through a second well, wherein the second well comprises a second horizontal portion that is located at a second depth within the geologic formation, wherein the second depth is four hundred feet above the first depth, wherein the second horizontal portion is parallel and vertically aligned with the first horizontal portion, and wherein the first production fluids comprise 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.

A well system comprising:

• a first well at a first depth within a geologic formation, wherein the first well is configured to act as a production well or an injection well, and wherein the first well comprises a first horizontal portion;
• 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 is configured to act as a production well or an injection well, wherein the second well comprises a second horizontal portion that is parallel and vertically aligned with the first horizontal portion;
• and
• a topside facility configured to:
• during a first three-month period of time:
• inject first CO2 into the geologic formation through the first well to sweep first hydrocarbons within the geologic formation upward towards the second well,
• produce first production fluids from the geologic formation through the second well, the first production fluids comprising the first hydrocarbons, and
• separate second CO2 from the first production fluids;
• during a second three-month period of time occurring after the first three-month period of time:
• inject water into the geologic formation through the first well to sweep second hydrocarbons within the geologic formation upward towards the second well, and
• produce 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:
• inject the second CO2 into the geologic formation through the second well to sweep third hydrocarbons within the geologic formation downward towards the first well,
• produce second production fluids from the geologic formation through the first well, the second production fluids comprising the third hydrocarbons, and
• separate 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, inject the third CO2 into the geologic formation through the first well to sweep fourth hydrocarbons within the geologic formation upward towards the second well.