Wellbore servicing methods and compositions comprising degradable polymers

Patent metadata

Field	Value
Publication number	US-9410076-B2
Application number	US-201314065701-A
Country	US
Kind code	B2
Filing date	Oct 29, 2013
Priority date	Oct 25, 2012
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A method of servicing a wellbore comprising providing a degradable polymer and a delayed action construct within a portion of a wellbore, a subterranean formation or both; wherein the delayed action construct comprises (i) a degradation accelerator comprising an alkanolamine, an oligomer of aziridine, a polymer of azridine, a diamine, or combinations thereof, (ii) a solid support, and (iii) an encapsulating material; and placing the wellbore servicing fluid comprising the degradable polymer and delayed action construct into the wellbore, the subterranean formation or both.

First claim

What is claimed is:

1. A method of servicing a wellbore comprising:
providing a first component comprising a degradable polymer and a second component
comprising a delayed action construct within a portion of a wellbore, a subterranean formation or both;
wherein the delayed action construct comprises (i) a degradation accelerator comprising an oligomer of aziridine (ii) a solid support, and (iii) an encapsulating material; and
placing the wellbore servicing fluid comprising the degradable polymer and delayed action construct into the wellbore, the subterranean formation or both.

2. The method of claim 1 wherein the oligomer of aziridine is selected from the group consisting of: a linear aziridine oligomer, a branched aziridine oligomer, any derivatives thereof, and any combination thereof.

3. The method of claim 1 wherein the oligomer of aziridine comprises a compound characterized by Formula II:

where n may range from about 2 to about 100 and R 3 comprises a primary amine.

4. The method of claim 1 wherein the oligomer of aziridine comprises a compound characterized by Formula III:

where m ranges from about 2 to about 100 and R 4 comprises a methyl group.

5. The method of claim 1 wherein the oligomer of aziridine comprises a compound characterized by Formula IV:

where the repeating units occur in a total amount of about (x+y) wherein the total value of (x+y) ranges from about 2 to about 50.

6. The method of claim 1 wherein the degradation accelerator is present in the well bore servicing fluid in an amount of from about 0.1 wt. % to about 50 wt. % based on the total weight of the wellbore servicing fluid.

7. The method of claim 1 wherein the degradable polymer comprises a polymer selected from the group consisting of: a poly(lactide).

8. The method of claim 1 wherein the solid support comprises a particulate porous material.

9. The method of claim 8 wherein the particulate porous material is selected from the group consisting of: diatomaceous earth, silica, alumina, a metal salt of an alumino-silicate, a clay, hydrotalcite, a styrenedivinylbenzene-based material, a cross-linked polyalkylacrylate ester, a cross-linked modified starch, and any combination thereof.

10. The method of claim 1 wherein the encapsulating material is selected from the group consisting of: a crosslinked polyurethane.

11. The method of claim 1 wherein the degradation accelerator is spray coated onto the solid support.

12. A method of servicing a wellbore comprising:
providing a degradable polymer and a delayed action construct within a portion of a wellbore, a subterranean formation or both;
wherein the delayed action construct comprises (i) a degradation accelerator comprises an oligomer of aziridine, (ii) a solid support, and (iii) an encapsulating material;
wherein the oligomer of aziridine comprises a compound characterized by Formula VI:

where m ranges from about 2 to 100 and R 4 comprises a methyl group; and

placing the wellbore servicing fluid comprising the degradable polymer and delayed action construct into the wellbore, the subterranean formation or both.

Assignees

• Halliburton Energy Services Inc

Inventors

• Reddy B Raghava
• Cortez Janette
• Ogle James William

Classifications

• E21B43/26

  by forming crevices or fractures · CPC title

• C09K8/40

  Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses · CPC title

• C09K8/885 Primary

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09K8/44

  containing organic binders only · CPC title

• C09K8/035 Primary

  Organic additives · CPC title