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US 10,883,040 B2Granted
Injection fluids for oil recovery and methods of making and using the same
AssigneeExxonMobil Research and Engineering Company
InventorsAditya Jaishankar, Mohsen S. Yeganeh, Jessica L. Vreeland, Daniel P. Cherney
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Abstract
Viscous aqueous injections fluids including polymers having hydrophilic moieties and hydrophobic groups and at least one of crude oil emulsions and amphiphilic diblock copolymers are provided herein. Methods of making the aqueous injection fluids, and methods of using the aqueous injection fluids for oil recovery are also provided.
Claims17
A method for recovering oil from an oil reservoir, wherein the method comprises:
- introducing an aqueous injection fluid into the oil reservoir having a salinity concentration of at least about 5,000 ppm to force the oil into a producing well for recovery,
- wherein the aqueous injection fluid comprises:
- a polymer comprising hydrophilic moieties and a plurality of hydrophobic groups;
- an aqueous crude oil microemulsion, wherein the crude oil of the aqueous crude oil microemulsion has a total acid number (TAN) greater than about 0.4;
- a basic compound;
- and
- an amphiphilic diblock copolymer;
- wherein the amphiphilic diblock copolymer is selected from the group consisting of polyethylene-block-polyethylene glycol, polyethylene-block-polypropylene glycol, polyethylene glycol-block-polystyrene, polyethylene oxide-block-polycaprolactone, and a combination thereof;
- wherein the amphiphilic diblock copolymer prevents phase separation of the aqueous crude oil emulsion in the oil reservoir.
6 more elements
Dependencies are inferred from the claim text.