Cementing Composition Comprising within Un-Reacted Cement

• US 20120312535A1
• Filed: 07/13/2012
• Published: 12/13/2012
• Est. Priority Date: 09/20/2006
• Status: Active Grant

• Current Assignee: Michel Michaux, Sylvaine Le Roy-Delage
• Original Assignee: Michel Michaux, Sylvaine Le Roy-Delage
• Inventors: Michaux, Michel, Le Roy-Delage, Sylvaine
• Granted Patent: US 8,517,101 B2
• Time in Patent Office: Days
• US Class Current: 166/292
• CPC Class Codes: C04B 16/04 Macromolecular compounds C04B16/02 takes precedence
• CPC Class Codes: C04B 20/0076 characterised by the grain distribution
• CPC Class Codes: C04B 20/1018 with organic materials pigments or dyes C04B20/1096
• CPC Class Codes: C04B 2103/0049 Water-swellable polymers
• CPC Class Codes: C04B 2103/40 Surface-active agents, dispersants
• CPC Class Codes: C04B 2111/00068 Mortar or concrete mixtures with an unusual water/cement ratio
• CPC Class Codes: C04B 2111/50 Flexible or elastic materials
• CPC Class Codes: C04B 24/2676 Polystyrenes
• CPC Class Codes: C04B 24/36 Bituminous materials, e.g. tar, pitch C04B24/243 takes precedence
• CPC Class Codes: C04B 28/02 containing hydraulic cements other than calcium sulfates
• CPC Class Codes: C04B 40/0675 Mortars activated by rain, percolating or sucked-up water; Self-healing mortars or concrete
• CPC Class Codes: C04B 7/00 Hydraulic cements calcium sulfate cements C04B11/00
• CPC Class Codes: C09K 8/42 Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells compositions for plastering C09K8/50
• CPC Class Codes: C09K 8/428 for squeeze cementing, e.g. for repairing
• CPC Class Codes: C09K 8/467 containing additives for specific purposes

Abstract

The invention provides a cementing composition for use in oilfield application, wherein a significant amount of cement is left intentionally un-hydrated when the cement is set; such that said amount of un-hydrated cement becomes hydrated when the set cement is damaged.

Claims

1-14. -14. (canceled)

15. A cementing composition for use in oilfield applications, comprising a cement, an emulsion and water, the water-to-cement ratio being between 0.04 and 0.29 by weight;

wherein emulsion allows an amount of cement to be left un-hydrated when the cement is set; and

allows said amount of un-hydrated cement to become hydrated when the set cement is damaged.

16. The cementing composition of claim 15, wherein the emulsion is an oil-in-water emulsion and is stabilized with a surfactant.

17. The cementing composition of claim 16, wherein the emulsion contains up to 50% by volume of oil.

18. The cementing composition of claim 15, wherein the emulsion is an aqueous suspension of latex particles.

19. The cementing composition of claim 18, wherein the latex particles is a styrene-butadiene latex.

20. The cementing composition of claim 18, wherein the suspension contains up to 45% by volume of latex.

21. The cementing composition of claim 15, wherein the emulsion is a suspension of nano organic solid or nano inorganic solid.

22. The cementing composition of claim 15, wherein the emulsion is a mixture of water and solvent, wherein the solvent is highly miscible and does not react with the cement.

23. The cementing composition according to claim 15, further comprising flexible particles.

24. The cementing composition according to claim 15, further comprising swellable particles wherein particles are swellable with hydrocarbon (gas and/or oil) and/or water.

25. The cementing composition according to claim 15, further comprising flexible additives and/or fibers to improve the toughness and to prevent crack creation and propagation.

26. The composition of claim 18, further comprising flexible particles.

27. The composition of claim 19, wherein the suspension contains up to 45% by volume of styrene-butadiene latex.

28. A method for cementing a subterranean well, comprising:

(i) preparing a slurry comprising cement, water, and an emulsion; and

(ii) placing the slurry in the well,

wherein the water-to-cement ratio is between 0.04 and 0.29 by weight, and wherein the emulsion comprises a water-in-oil emulsion whose oil-to-water ratio is higher than 50% by weight, or a water-in-solvent emulsion.

29. The method of claim 28, wherein the slurry further comprises flexible particles, fibers, particles that swell in the presence of a hydrocarbon, particles that swell in the presence of water, or a combination thereof.

30. The method of claim 28, wherein the emulsion is stabilized by a surfactant.

31. The method of claim 28, wherein the solvent is miscible and does not react with the cement.