Methods of pre-flushing reservoir paths for higher return of hydrocarbon fluids

Patent metadata

Field	Value
Publication number	US-9944842-B2
Application number	US-201514599165-A
Country	US
Kind code	B2
Filing date	Jan 16, 2015
Priority date	Feb 5, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

Pumping a pre-flush composition into a subterranean reservoir may contact at least a portion of non-polar material within a reservoir path. The pre-flush composition may have or include a polar fluid and at least one surfactant. The pre-flush composition may in situ form an in situ fluid in the reservoir path. The in situ formed fluid may include a portion of the non-polar material from the reservoir path, a polar phase from the polar fluid, and at least one surfactant. Pre-flushing the reservoir path may allow for greater hydrocarbon recovery when performing a subsequent operation as compared to an otherwise identical operation absent the pre-flushing the reservoir.

First claim

What is claimed is:

1. A method of pre-flushing a subterranean reservoir path to improve a subsequent operation; wherein the operation is a secondary operation, a tertiary operation, and combinations thereof; wherein the method comprises:
pumping a multiple phase composition through an injection well into a subterranean reservoir to contact at least a portion of non-polar material within the subterranean reservoir path; wherein the multiple phase composition comprises a polar phase, a non-polar phase, and at least one surfactant, and the multiple phase composition is an emulsion within an emulsion;
breaking the multiple phase composition;
contacting at least a portion of non-polar material in the subterranean reservoir path with the broken multiple phase composition; and
in situ forming an in situ fluid downhole, wherein the in situ formed fluid comprises a portion of non-polar material from the subterranean reservoir path, a polar phase, and the at least one surfactant;

where the subterranean reservoir path is between the injection well and a production well.

2. The method of claim 1 , wherein the multiple phase composition further comprises an additional component selected from the group consisting of a solvent, a co-surfactant, a co-solvent, an organic acid, an inorganic acid, a surfactant having a liphophilic linker, a surfactant having a hydrophilic linker, a chelating agent, and combinations thereof.

3. The method of claim 2 , wherein the co-surfactant is selected from the group consisting of alcohols, glycols, ethoxylated alcohols, ethoxylated glycols, ethoxylated phenols, propoxylated alcohols, propoxylated glycols, propoxylated phenols, ethoxylated and propoxylated alcohols, ethoxylated and propoxylated glycols, ethoxylated and propoxylated phenols, and combinations thereof.

4. The method of claim 1 , further comprising performing the operation after forming the in situ fluid downhole, wherein the operation is selected from the group consisting of water-based flooding, gas injection method, thermal recovery methods, and combinations thereof.

5. The method of claim 4 , further comprising recovering more hydrocarbon fluids from the subterranean reservoir as compared to an otherwise identical operation absent the pre-flushing the subterranean reservoir path.

6. The method of claim 4 , further comprising recovering more hydrocarbon fluids from the subterranean reservoir as compared to an otherwise identical operation absent the pre-flushing the subterranean reservoir path.

7. The method of claim 1 , wherein the at least one surfactant is present in the multiple phase composition in an amount ranging from about 0.01 vol % to about 10 vol %.

8. The method of claim 1 , wherein the in situ fluid is selected from the group consisting of a miniemulsion, a nanoemulsion, a single-phase microemulsion, a Winsor III microemulsion, and combinations thereof.

9. A method of pre-flushing a subterranean reservoir path to improve a subsequent operation; wherein the operation is a secondary operation, a tertiary operation, and combinations thereof; wherein the method comprises:
pumping a multiple phase composition through an injection well into a subterranean reservoir to contact at least a portion of non-polar material within the subterranean reservoir path; wherein the multiple phase composition comprises a polar phase, a non-polar phase, and at least one surfactant, and the multiple phase composition is an emulsion within an emulsion, wherein the at least one surfactant is present in the multiple phase composition in an amount ranging from about 0.01 vol % to about 10 vol %;
breaking the multiple phase composition;
contacting at least a portion of non-polar material in the subterranean reservoir path with the broken multiple phase composition; and
in situ forming an in situ fluid downhole, wherein the in situ formed fluid comprises a portion of non-polar material from the subterranean reservoir path, a polar phase, and the at least one surfactant;

where the subterranean reservoir path is between the injection well and a production well; and
performing the operation after forming the in situ fluid downhole, wherein the operation is selected from the group consisting of water-based flooding, gas injection method, thermal recovery methods, and combinations thereof.

10. The method of claim 9 , wherein the multiple phase composition further comprises an additional component selected from the group consisting of a solvent, a co-surfactant, a co-solvent, an organic acid, an inorganic acid, a surfactant having a liphophilic linker, a surfactant having a hydrophilic linker, a chelating agent, and combinations thereof.

11. The method of claim 9 , wherein the co-surfactant is selected from the group consisting of alcohols, glycols, ethoxylated alcohols, ethoxylated glycols, ethoxylated phenols, propoxylated alcohols, propoxylated glycols, propoxylated phenols, ethoxylated and propoxylated alcohols, ethoxylated and propoxylated glycols, ethoxylated and propoxylated phenols, and combinations thereof.

12. The method of claim 9 , wherein the in situ fluid is selected from the group consisting of a miniemulsion, a nanoemulsion, a single-phase microemulsion, a Winsor III microemulsion, and combinations thereof.

Assignees

• Baker Hughes Inc
• Baker Hughes A Ge Co Llc

Inventors

• Quintero Lirio
• Weghorn Steven

Classifications

• C09K8/594

  Compositions used in combination with injected gas {, e.g. CO2 orcarbonated gas}(C09K8/592 takes precedence) · CPC title

• C09K8/584 Primary

  characterised by the use of specific surfactants · CPC title

• C09K8/592

  Compositions used in combination with generated heat, e.g. by steam injection · CPC title

• E21B21/00

  Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) · CPC title