A method and compounds for enhanced oil recovery (EOR) including flooding of a mixture of water and one or more of the compounds in a geological formation. The compounds have a fluoroalkyl group.

A method and compounds for enhanced oil recovery (EOR) including flooding of a mixture of water and one or more of the compounds in a geological formation. The compounds have a fluoroalkyl group.

Disclosed are methods, systems, and computer-readable medium to perform operations including performing, using a nanoscale model, a simulation of fluid-fluid and fluid-rock interactions in the subterranean formation. The operations also include upscaling first results of the simulation of fluid-fluid and fluid-rock interactions to a microscale level. The operations further include performing, using a microscale model and the upscaled first results, a simulation of fluid flow inside rocks of the subterranean formation. Additionally, the operations include upscaling second results of the simulation of fluid flow inside rocks to a macroscale level. Further, the operations include performing, using a core-scale model and the upscaled second results, a simulation of fluid flow across the subterranean formation.

Disclosed are methods, systems, and computer-readable medium to perform operations including performing, using a nanoscale model, a simulation of fluid-fluid and fluid-rock interactions in the subterranean formation. The operations also include upscaling first results of the simulation of fluid-fluid and fluid-rock interactions to a microscale level. The operations further include performing, using a microscale model and the upscaled first results, a simulation of fluid flow inside rocks of the subterranean formation. Additionally, the operations include upscaling second results of the simulation of fluid flow inside rocks to a macroscale level. Further, the operations include performing, using a core-scale model and the upscaled second results, a simulation of fluid flow across the subterranean formation.

A method for selectively optimizing water chemistry within a wellbore may include positioning a system tubing in the wellbore. The system tubing may include an electrochemical cell, a first chamber, and a second chamber. The method may also include injecting a fluid into the electrochemical cell and directing an electrical current into the electrochemical cell wherein the fluid separates by charge into a first fluid and a second fluid. The method may also include passing the first fluid into the first chamber and the second fluid into the second chamber. Also, the method may include rotating the system tubing, wherein the first fluid flows from the first chamber to the wellbore though a first radial conduit and the second fluid flows from the second chamber to the wellbore through a second radial conduit.

A method for selectively optimizing water chemistry within a wellbore may include positioning a system tubing in the wellbore. The system tubing may include an electrochemical cell, a first chamber, and a second chamber. The method may also include injecting a fluid into the electrochemical cell and directing an electrical current into the electrochemical cell wherein the fluid separates by charge into a first fluid and a second fluid. The method may also include passing the first fluid into the first chamber and the second fluid into the second chamber. Also, the method may include rotating the system tubing, wherein the first fluid flows from the first chamber to the wellbore though a first radial conduit and the second fluid flows from the second chamber to the wellbore through a second radial conduit.

A high salinity feed water such as seawater is treated to produce a reverse osmosis (RO) concentrate and an RO permeate. Optionally, some or all of the RO concentrate may be filtered to produce a nanofiltration (NF) permeate. Optionally, some feed water can also be filtered to produce NF permeate without first being concentrated by RO treatment. The NF permeate, or a blend of the RO permeate and NF permeate, may be used to produce a product water for injection into an oil-bearing reservoir to enhance oil recovery. Optionally, the product water may have salinity greater than the feedwater, or at least 30 g/L. The product water may have hardness of less than 20 mg/L.

System and method for conducting enhanced oil recovery by establishing a plurality of stacked, alternating slugs of gas and liquid travelling downhole into a subterranean well. The system can include a buffer tank including a liquid inlet through which liquid is received from a liquids source into the buffer tank, a gas inlet through which gas is received from a pressured gas source into the buffer tank, a gas outlet in fluid communication with gas reservoired in the buffer tank, and a liquid outlet in fluid communication with liquid reservoired in the buffer tank. The system can further include a pressure control configured to maintain a specified pressure in gas reservoired within the buffer tank and a fluid dispensing system in fluid communication with the gas and liquid outlets of the buffer tank.

Systems, methods, and computer program products can be used for determining the amount of oil removed by a miscible gas flood. One of the methods includes identifying locations of oil within a volume representing a reservoir rock sample. The method includes identifying locations of gas within the volume. The method also includes determining the amount of oil removed based on locations within the volume where oil is either coincident with the gas or is connected to the gas by a continuous oil path.

Systems, methods, and computer program products can be used for determining the amount of oil removed by a miscible gas flood. One of the methods includes identifying locations of oil within a volume representing a reservoir rock sample. The method includes identifying locations of gas within the volume. The method also includes determining the amount of oil removed based on locations within the volume where oil is either coincident with the gas or is connected to the gas by a continuous oil path.