Acidizing and proppant transport with emulsified fluid

Patent metadata

Field	Value
Publication number	US-11124698-B2
Application number	US-201616339458-A
Country	US
Kind code	B2
Filing date	Nov 7, 2016
Priority date	Nov 7, 2016
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

Methods and compositions for stimulating oil or gas production from a well with a single treatment fluid for use in a combined acidizing and hydraulic fracturing treatment are provided. An embodiment is a method comprising: coating a plurality of proppant particulates with oil to form oil-coated proppant particulates; adding the oil-coated proppant particulates to a solution comprising water, an acid source, and an emulsifier, wherein the ratio of the oil coating the proppant particulates to the water in the solution is less than 20:80 by volume; and mixing the solution and the oil-coated proppant particulates to form a treatment fluid comprising a water-in-oil emulsion and the oil-coated proppant particulates.

First claim

What is claimed is:

1. A method comprising:
coating a plurality of proppant particulates with oil to form oil-coated proppant particulates;
adding the oil-coated proppant particulates to a solution comprising water, an acid source, and an emulsifier; and
mixing the solution, an oil, and the oil-coated proppant particulates to form a treatment fluid comprising a water-in-oil emulsion and the oil-coated proppant particulates, wherein the water-in-oil emulsion has an oil to water ratio of less than 20:80 by volume.

2. The method of claim 1 wherein the water-in-oil emulsion has an oil to water ratio of less than 10:90 by volume.

3. The method of claim 1 wherein the water-in-oil emulsion has an oil to water ratio of about 1:20 by volume.

4. The method of claim 1 wherein the acid source comprises an acid selected from the group consisting of: hydrochloric acid, hydrofluoric acid, fluoroboric acid, methanesulfonic acid, formic acid, phosphoric acid, sulfuric acid, chlorosulfonic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid; MGDA; GLDA; EDDS; HIDS; HEDTA; IDA; gluconic acid; lactic acid; glycolic acid; maleic acid; citric acid; and any combination thereof.

5. The method of claim 1 wherein the emulsifier has an HLB of from about 4 to about 12.

6. The method of claim 1 further comprising the step of injecting the treatment fluid into a well bore penetrating at least a portion of a subterranean formation at pressure greater than a fracture gradient of the subterranean formation.

7. The method of claim 6 further comprising the step of injecting a displacement fluid into the well bore after injecting the treatment fluid.

8. The method of claim 7 wherein the water-in-oil emulsion has an oil to water ratio of less than 10:90 by volume.

9. The method of claim 7 wherein the water-in-oil emulsion has an oil to water ratio of about 1:20 by volume.

10. The method of claim 7 wherein the acid source is hydrochloric acid and the emulsifier has an HLB of from about 4 to about 12.

11. The method of claim 6 wherein the treatment fluid is injected into the well bore using one or more pumps.

12. The method of claim 1 wherein the water-in-oil emulsion has an oil to water ratio of about 5:95 by volume.

13. The method of claim 1 wherein the acid source is hydrochloric acid.

14. The method of claim 1 wherein the acid source is hydrofluoric acid.

15. The method of claim 1 wherein the acid source has a pKa from about −3.0 to about 5.5.

16. The method of claim 1 wherein the emulsifier has a concentration of at least 1% by weight of the water-in-oil emulsion.

17. The method of claim 1 wherein the emulsifier has a concentration in a range from 1% to 10% by weight of the water-in-oil emulsion.

18. The method of claim 1 wherein the treatment fluid comprises a salt selected from the group consisting of: calcium chloride, sodium chloride, magnesium chloride, potassium chloride, sodium bromide, potassium bromide, ammonium chloride, sodium formate, potassium formate, cesium formate, and any combination thereof.

19. The method of claim 1 wherein the treatment fluid comprises calcium chloride.

20. The method of claim 1 wherein the treatment fluid comprises the oil-coated proppant particulates in an amount from about 0.01 to about 25 pounds per gallon of the treatment fluid.

Assignees

• Halliburton Energy Services Inc

Inventors

• Chopade Prashant D
• Salla Rajender
• Dandawate Monica Rajendra
• Reyes Enrique Antonio
• Stephens Walter T

Classifications

• C09K8/72

  Eroding chemicals, e.g. acids · CPC title

• C09K8/82

  Oil-based compositions (C09K8/64 takes precedence) · CPC title

• E21B43/267 Primary

  reinforcing fractures by propping · CPC title

• C09K8/805 Primary

  Coated proppants · CPC title