Wellbore servicing methods and compositions comprising degradable polymers

Patent metadata

Field	Value
Publication number	US-2016304773-A1
Application number	US-201615195724-A
Country	US
Kind code	A1
Filing date	Jun 28, 2016
Priority date	Oct 25, 2012
Publication date	Oct 20, 2016
Grant date	—

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 alkanolamine, a polymer of aziridine, 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.

2 . The method of claim 1 wherein the alkanolamine-is selected from the group consisting of:
ethanolamine, triethanolamine, monoethanolamine, diethanolamine, diglycolamine, di-2-propanolamine, N-ethyldiethanolamine, 2-amino-2-methyl-1-propanol, 2-piperidineethanol, aminopropane diol, and any combination thereof.

3 . The method of claim 1 wherein the alkanolamine comprises a compound characterized by Formula I:

where R 1 and R 2 may each independently be hydrogen, an unsubstituted alkyl chain comprising from about 1 to about 6 carbon atoms, or a substituted alkyl chain comprising from about 3 to about 6 carbon atoms and X comprises a substituted or unsubstituted alkylene having from about 1 to about 4 carbon atoms.

4 . The method of claim 1 wherein the diamine comprises a compound characterized by general Formula V:

where R 5 , R 6 , R 7 , and R 8 may each independently be hydrogen, an unsubstituted alkyl chain having from about 1 to about 3 carbon atoms, or a substituted alkyl chain having from about 2 to about 4 carbon atoms and Z comprises a substituted or unsubstituted alkylene chain having from about 2 to about 6 carbon atoms.

5 . 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.

6 . The method of claim 1 wherein the degradable polymer comprises a polymer selected from the group consisting of: an aliphatic polyester, a poly(lactide), a poly(glycolide), a poly(ε-caprolactone), a poly(hydroxy ester ether), a poly(hydroxybutyrate), a poly(anhydride), a polycarbonate, a polyether ester, a polyester amide, a copolymer thereof, and any combination thereof.

7 . The method of claim 6 wherein the degradable polymer comprises a poly(lactide).

8 . The method of claim 1 wherein the degradable polymer comprises a copolymer of lactic and glycolic acid.

9 . The method of claim 1 wherein the degradable polymer further comprises a plasticizer.

10 . The method of claim 9 wherein the plasticizer is selected from the group consisting of: a polyethylene glycol (PEG); a polyethylene oxide; an oligomeric lactic acid; a citrate ester; a glucose monoester; a partially hydrolyzed fatty acid ester; a PEG monolaurate; a triacetin; a poly(ε-caprolactone); a poly(hydroxybutyrate); a glycerin-1-benzoate-2,3-dilaurate; a glycerin-2-benzoate-1,3-dilaurate; a bis(butyl diethylene glycol)adipate; an ethylphthalylethyl glycolate; a glycerin diacetate monocaprylate; a diacetyl monoacyl glycerol; a polypropylene glycol; an epoxy derivative of a polypropylene glycol; a poly(propylene glycol)dibenzoate; a dipropylene glycol dibenzoate; a glycerol; an ethyl phthalyl ethyl glycolate; a poly(ethylene adipate)distearate; a di-iso-butyl adipate, and any combination thereof.

11 . The method of claim 1 wherein the solid support is selected from the group consisting of: a clay, zeolite, polymeric resin, lignite, inorganic oxide, and any combination thereof.

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

13 . The method of claim 12 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.

14 . The method of claim 1 wherein the encapsulating material is selected from the group consisting of: a cellulose-based polymer, a cellulose ether, a methylcellulose, a hydroxypropyl methylcellulose, an ethylhydroxyethylcellulose, a methylhydroxyethylcellulose, a bacterial based gum, a plant based gum, a xanthan, a diutan, a gellan, a gum tragacanth, a pestan, and any combination thereof.

15 . The method of claim 1 wherein the encapsulating material is selected from the group consisting of: an EDPM rubber, a polyvinyldichloride, a nylon, a wax, a polyurethane, a cross-linked partially hydrolyzed acrylic, a crosslinked polyurethane, and any combination thereof.

16 . The method of claim 1 wherein the encapsulating material is selected from the group consisting of: tung oil, linseed oil, and any combination thereof.

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

18 . The method of claim of claim 1 wherein the degradation accelerator comprises an alkanolamine and wherein the encapsulating material comprises a crosslinked polyurethane.

19 . The method of claim 1 wherein the degradation accelerator comprises a polymer of aziridine and wherein the encapsulating material comprises a crosslinked polyurethane.

20 . The method of claim 1 wherein the degradation accelerator comprises a diamine and wherein the encapsulating material comprises a crosslinked polyurethane.

Assignees

• Halliburton Energy Services Inc

Inventors

• Reddy B Raghava
• Cortez Janette
• Ogle James William

Classifications

• E21B43/26

  by forming crevices or fractures · CPC title

• C09K8/885 Primary

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

• C09K8/74

  combined with additives added for specific purposes · CPC title

• C09K8/035 Primary

  Organic additives · CPC title

• C09K8/40

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