Compositions and methods for inhibiting shale and preventing shale accretion

Patent metadata

Field	Value
Publication number	US-2023002664-A1
Application number	US-202217649077-A
Country	US
Kind code	A1
Filing date	Jan 27, 2022
Priority date	Jul 1, 2021
Publication date	Jan 5, 2023
Grant date	—

Abstract

Methods of treating a subterranean formation including shale include preparing a treatment fluid by mixing an aqueous base fluid and a dry polyvinyl pyrrolidone (PVP) in flake or powder form having a molecular weight between about 500,000 and about 2,000,000 and introducing the treatment fluid in the subterranean formation.

First claim

What is claimed is:

1 . A method of treating a subterranean formation comprising shale comprising:
preparing a treatment fluid by mixing an aqueous base fluid and a dry polyvinyl pyrrolidone (PVP) in flake or powder form having a molecular weight between about 500,000 to about 2,000,000; and introducing the treatment fluid in the subterranean formation.

2 . The method of claim 1 , wherein the PVP is present in the treatment fluid in an amount sufficient to inhibit degradation of the shale or prevent accretion of the shale.

3 . The method of claim 2 , wherein the PVP is present in the treatment fluid in an amount in a range of about 0.04 pounds per barrel (ppb) to about 10 ppb of the treatment fluid.

4 . The method of claim 3 , wherein the PVP is present in the treatment fluid in an amount in a range of about 1 ppb to about 8 ppb.

5 . The method of claim 1 , wherein the treatment fluid further comprises a salt.

6 . The method of claim 5 , wherein the salt comprises potassium chloride, calcium chloride, sodium chloride, potassium formate, calcium bromide, potassium carbonate, or a mixture thereof.

7 . The method of claim 1 , wherein the aqueous base fluid comprises fresh water.

8 . The method of claim 1 , wherein the PVP is in flake form and has a molecular weight between about 900,000 to about 2,000,000.

9 . The method of claim 1 , wherein the treatment fluid comprises a drilling fluid.

10 . A method of drilling a well in a subterranean formation comprising shale comprising:
preparing a drilling fluid by mixing an aqueous base fluid and a dry polyvinyl pyrrolidone (PVP) in flake or powder form having a molecular weight between about 500,000 to about 2,000,000; introducing the drilling fluid into a well bore in contact with a drill bit and the subterranean formation; and using the drilling fluid to drill in at least a portion of the subterranean formation.

11 . The method of claim 10 , wherein the PVP is present in the drilling fluid in an amount in a range of about 0.04 pounds per barrel (ppb) to about 10 ppb of the drilling fluid.

12 . The method of claim 10 , wherein the drilling fluid further comprises a salt.

13 . The method of claim 12 , wherein the salt comprises potassium chloride, calcium chloride, sodium chloride, potassium formate, calcium bromide, potassium carbonate, or a mixture thereof.

14 . The method of claim 1 , wherein the PVP is in flake form and has a molecular weight between about 900,000 to about 2,000,000.

15 . A method of preparing a drilling fluid comprising:
mixing (1) an aqueous base fluid, (2) a dry polyvinyl pyrrolidone (PVP) in flake or powder form having a molecular weight between about 500,000 and about 2,000,000, and (3) at least one of the following: a salt; an antifoam; a biocide; a bridging agent; a corrosion control agent; a dispersant; a flocculant; a fluid loss additive; a foamer; a gas; an H 2 S scavenger; a lubricant; an oxygen scavenger; a scale inhibitor; a viscosifier; or a weighting agent, wherein the PVP is present in the drilling fluid in an amount in a range of about 0.04 pounds per barrel (ppb) to about 10 ppb of the drilling fluid.

16 . The method of claim 15 , wherein the PVP is in flake form and has a molecular weight between about 900,000 to about 2,000,000.

17 . A drilling fluid prepared by the method of claim 15 .

18 . The drilling fluid of claim 17 , wherein the PVP is present in the drilling fluid in an amount in a range of about 1 ppb to about 8 ppb.

19 . The drilling fluid of claim 17 , comprising the aqueous base fluid, the PVP, and the salt.

20 . The drilling fluid of claim 19 , wherein the salt comprises potassium chloride, calcium chloride, sodium chloride, potassium formate, calcium bromide, potassium carbonate, or a mixture thereof.

Assignees

• Halliburton Energy Services Inc

Inventors

• Chavan Sandeep
• Miller Jeffrey J

Classifications

• C09K2208/12

  Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating · CPC title

• C09K8/12 Primary

  containing synthetic organic macromolecular compounds or their precursors · CPC title

• E21B21/062

  by mixing components · CPC title

• C09K8/035 Primary

  Organic additives · CPC title