Polymer compositions
US-2016122626-A1 · May 5, 2016 · US
Addition of monovalent salts for improved viscosity of polymer solutions used in oil recovery applications
US11124694B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11124694-B2 |
| Application number | US-201916593679-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 4, 2019 |
| Priority date | Jul 26, 2016 |
| Publication date | Sep 21, 2021 |
| Grant date | Sep 21, 2021 |
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- Title
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Abstract
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An oil recovery composition having a brine, a hydrolyzable polymer, and a monovalent cations to divalent cations ration in the range of about 2.5:1 to 3:1 is provided. An oil recovery composition may be formed from a brine recovered from production water and a polymer. A monovalent salt may be added to the brine recovered from production water to form a modified brine and achieve a modified monovalent cations to divalent cations ratio in the range of about 2.5:1 to 3:1. Processes for forming the oil recovery composition and enhanced oil recovery using the oil recovery composition are provided.
First claim
Opening claim text (preview).
What is claimed is: 1. A composition for enhancing oil recovery in a hydrocarbon reservoir formation, comprising: a modified brine having a modified monovalent cations to divalent cations mass ratio in a range of 2.5:1 to 3:1, the modified monovalent cations to divalent cations mass ratio selected to achieve a target viscosity of the composition, the modified brine formed by adding a monovalent salt to a brine to modify the mass ratio of monovalent cations to divalent cations of the brine, the modified brine having a Na + concentration in the range of 22,166 milligrams/liter (mg/L) to 30,624 mg/L and a total dissolved solids (TDS) of at least 84175 mg/L; and a hydrolyzable polymer having a concentration of 0.05 weight (wt) % to 0.5 wt %. 2. The composition of claim 1 , wherein the hydrolyzable polymer comprises polyacrylamide. 3. The composition of claim 1 , wherein the monovalent cations comprise sodium cations. 4. The composition of claim 1 , wherein the divalent cations comprise at least one of calcium cations and magnesium cations. 5. The composition of claim 1 , wherein the target viscosity comprises at least 4 centipoise at conditions of the hydrocarbon reservoir formation. 6. The composition of claim 1 , wherein the brine comprises brine recovered from production water. 7. The composition of claim 1 , wherein the brine comprises treated seawater or untreated seawater. 8. The composition of claim 1 , wherein the brine comprises aquifer water. 9. The composition of claim 1 , wherein the monovalent salt comprises sodium chloride (NaCl). 10. The composition of claim 1 , comprising a surfactant.
Assignees
Inventors
Classifications
- C09K8/588Primary
characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} · CPC title
Acrylamide; Methacrylamide · CPC title
Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties · CPC title
Compositions based on water or polar solvents (C09K8/565 takes precedence) · CPC title
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- What does patent US11124694B2 cover?
- An oil recovery composition having a brine, a hydrolyzable polymer, and a monovalent cations to divalent cations ration in the range of about 2.5:1 to 3:1 is provided. An oil recovery composition may be formed from a brine recovered from production water and a polymer. A monovalent salt may be added to the brine recovered from production water to form a modified brine and achieve a modified mon…
- Who is the assignee on this patent?
- Saudi Arabian Oil Co
- What technology area does this patent fall under?
- Primary CPC classification C09K8/588. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 21 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).