Application of ground expanding agents in cement

Patent metadata

Field	Value
Publication number	US-2017349805-A1
Application number	US-201615171014-A
Country	US
Kind code	A1
Filing date	Jun 2, 2016
Priority date	Jun 2, 2016
Publication date	Dec 7, 2017
Grant date	—

Abstract

Embodiments may include cement compositions containing an expanding agent encapsulated with a polymeric material, wherein the polymeric material is permeable to aqueous fluids. Methods may include emplacing a cement slurry into a wellbore traversing a subterranean formation, wherein the cement slurry contains an expanding agent encapsulated with a polymeric material, wherein the polymeric material is permeable to aqueous fluids; allowing the cement slurry to harden; contacting the expanding agent encapsulated with a polymeric material with an aqueous fluid; and allowing the expanding agent to hydrate.

First claim

1 . A composition comprising:
a cement slurry comprising an expanding agent encapsulated with a polymeric material, wherein the polymeric material is permeable to aqueous fluids.

2 . The composition of claim 1 , wherein the expanding agent is one or more selected from a group consisting of MgO and CaO.

3 . The composition of claim 1 , wherein the polymeric material is one or more selected from a group consisting of nitrile butadiene rubber, hydrogenated nitrile butadiene rubber, carboxylated nitrile rubber, carboxylated hydrogenated nitrile rubber, silicone rubber, ethylene-propylene-diene copolymer, fluoroelastomer, and perfluoroelastomer.

4 . The composition of claim 1 , wherein the expanding agent encapsulated with a polymeric material comprises polymeric material that has been crosslinked following compounding with the expansion agent.

5 . The composition of claim 1 , wherein the expanding agent encapsulated with a polymeric material comprises expanding agent compounded in an amount that ranges from 50 phr to 250 phr of polymeric material.

6 . The composition of claim 1 , wherein in the expanding agent encapsulated with a polymeric material is present in the cement slurry at a concentration in the range of 5% to 50% bwoc.

7 . The composition of claim 1 , wherein the average particle size of the expanding agent encapsulated with a polymeric material is within the range of 100 μm to 1 mm.

8 . The composition of claim 1 , wherein the w/c ratio of the cement slurry is from 0.30 to 1.

9 . The composition of claim 1 , wherein the cement slurry further comprises additional polymeric material free of expanding agent.

10 . The composition of claim 1 , further comprising a super absorbent polymer.

11 . A method comprising:
emplacing a cement slurry into a wellbore traversing a subterranean formation, wherein the cement slurry comprises an expanding agent encapsulated with a polymeric material, wherein the polymeric material is permeable to aqueous fluids; allowing the cement slurry to harden; contacting the expanding agent encapsulated with a polymeric material with an aqueous fluid; and allowing the expanding agent to hydrate.

12 . The method of claim 11 , wherein the cement slurry is injected into one or more annuli created within the subterranean formation.

13 . The method of claim 11 , wherein the expanding agent is one or more selected from a group consisting of MgO and CaO.

14 . The method of claim 11 , wherein the polymeric material is one or more selected from a group consisting of: nitrile butadiene rubber, hydrogenated nitrile butadiene rubber, carboxylated nitrile rubber, carboxylated hydrogenated nitrile rubber, silicone rubber, ethylene-propylene-diene copolymer, fluoroelastomer, and perfluoroelastomer.

15 . The method of claim 11 , wherein the expanding agent encapsulated with a polymeric material comprises expanding agent compounded in an amount that ranges from 50 phr to 250 phr of polymeric material.

16 . The method of claim 11 , wherein the expanding agent encapsulated with a polymeric material is present in the cement slurry at a concentration in the range of 5% to 50% bwoc.

17 . The method of claim 11 , wherein the average particle size of the expanding agent encapsulated with a polymeric material is within the range of 100 μm to 1 mm.

18 . The method of claim 11 , wherein the w/c ratio of the cement slurry is from 0.30 to 1.

19 . The method of claim 11 , further comprising a super absorbent polymer.

20 . The method of claim 12 , wherein the expanding agent encapsulated with a polymeric material comprises polymeric material that has been crosslinked following compounding with the expansion agent.

21 . The method of claim 11 , wherein the expanding agent encapsulated with a polymeric material prevents gelation of the cement slurry.

22 . The method of claim 11 , wherein the polymeric material controls a rate of hydration of the expanding agent.

Assignees

• Schlumberger Technology Corp

Inventors

• Musso Simone
• Thomas Jeffrey J

Classifications

• C04B2103/42

  Pore formers · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B2103/0035

  Type G · CPC title

• C04B20/0004

  Microcomposites or nanocomposites, e.g. composite particles obtained by polymerising monomers onto inorganic materials · CPC title