Wellbore servicing methods and compositions comprising degradable polymers
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.
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.