Method and system for enhancing oil recovery (EOR) by injecting treated water into an oil bearing formation
AssigneeShell Oil Company
InventorsAlbert Joseph Hendrik Janssen, Guillo Alexander Schrader, Paulus Henricus Joannes Verbeek
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Abstract
A process and a system for enhancing recovery of oil from an oil-bearing formation are provided in which water having a total dissolved solids content is filtered to remove some solids in a filter assembly, the filtered water is treated to remove some ions in a capacitive deionization assembly, and the filtered deionized water is injected into the oil-bearing formation to mobilize crude oil and enhance oil recovery from the formation.
Claims13
A method for enhancing oil recovery (EOR) from an oil bearing formation, the method comprising:
- filtering at least some solids from a source water having a total dissolved solids content of from 10000 ppm to 50000 ppm in a filtration assembly to produce a first pre-treated water;
- treating the first pre-treated water with a nano-filtration (NF) assembly to produce a second pre-treated water wherein the second pre-treated water has reduced hardness and sulphate concentration relative to the source water;
- treating the second pre-treated water in a capacitive de-ionisation (CDI) assembly comprising at least one flowpath for the second pre-treated water arranged between a pair of oppositely charged electrodes which adsorb and thereby remove at least some ions from the second pre-treated water flowing through the flowpath, thereby producing treated water with a reduced salinity and solids content;
- and
- injecting the treated water with reduced salinity and solids content into the oil bearing formation to mobilize crude oil and enhance oil recovery.
A system for enhancing oil recovery (EOR)from an oil bearing formation, the system comprising:
- a filtration assembly for filtering at least some solids from a source water having a total dissolved solids content of from 10000 ppm to 50000 ppm to produce a first pre-treated water;
- a nano-filtration (NF) assembly configured to receive the first pre-treated water and configured to produce a second pre-treated water having a reduced hardness and sulphate concentration relative to the source water;
- a capacitive de-ionisation (CDI) assembly configured to receive the second pre-treated water, comprising at least one flowpath for the second pre-treated water arranged between a pair of substantially parallel oppositely charged electrodes which adsorb and thereby remove at least some ions from the second pre-treated water flowing through the flowpath, for producing treated water with a reduced salinity and solids content relative to the source water;
- and
- an injection well for injecting the treated water with reduced salinity and solids content into the oil bearing formation to mobilize crude oil and thereby enhance crude oil recovery from the formation.
Dependencies are inferred from the claim text.