System and method for enhanced oil recovery

A system (100) for enhanced oil recovery comprising:

• a vertical and/or lateral string section (20, 30, 40, 50) configured for installation in a wellbore (10),
• a production segment (110) with an uphole production packer (111) and a production valve (112) that allows a fluid flow into the string section (20, 30, 40) and prevents a fluid flow in the reverse direction, and
• an injection segment (120) with an uphole injection packer (121) and an injection valve (122) that allows a fluid flow out from the string section (20, 30, 50) and prevents a fluid flow in the reverse direction,
• wherein
• the production segment (110) and the injection segment (120) are configured to be installed in fluid communication with each other through a reservoir within one well;
• the production valve (112) is configured to open when the pressure within the production segment (110) is at or below an ambient pressure and to close when the pressure within the production segment (110) exceeds the ambient pressure;
• and
• the injection valve (122) is configured to open when the pressure within the injection segment (110) exceeds the ambient pressure and to close when the pressure within the injection segment (110) is at or below the ambient pressure.