Cementing composition comprising within un-reacted cement

• US 8,517,101 B2
• Filed: 07/13/2012
• Issued: 08/27/2013
• Est. Priority Date: 09/20/2006
• Status: Expired due to Fees

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Michaux, Michel, Le Roy-Delage, Sylvaine
• Primary Examiner(s): USELDING, JOHN E
• Application Number:
  US13/548,246
• Publication Number:
  US 20120312535A1
• Time in Patent Office: 410 Days
• Field of Search: 166/292, 166/295, 524/2
• US Class Current: 166/295
• 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. 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 the emulsion comprises a oil in water emulsion whose oil-to-water ratio is higher than 50% by weight, or a water-in-solvent emulsion.

2. The method of claim 1, 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.

3. The method of claim 1, wherein the emulsion is stabilized by a surfactant.

4. The method of claim 1, wherein the solvent is miscible and does not react with the cement.