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US 6,907,929 B2Granted
Cementing compositions and the use of such compositions for cementing wells
AssigneeSchlumberger Technology Corporation
InventorsSylvaine Leroy-Delage, Bernard Dargaud, Marc Thiercelin, Jean-François Baret
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Abstract
Cementing compositions for oil wells or the like comprise between 30% and 100% (by weight of cement) of rubber particles, with grain size in the 40-60 mesh range. Adding rubber particles in accordance with the invention produces a low density slurry while keeping the cement permeability low. Compositions of the invention are particularly advantageous for cementing zones subjected to extreme dynamic stresses such as perforation zones and the junctions of branches in a multi-sidetrack well.
Claims10
A method of cementing a well, comprising:
- (a) preparing a pumpable slurry by mixing
- i) cement;
- ii) rubber particles having grain sizes in the range 250-425 μm in an amount of between 30% and 100% by weight of cement;
- iii) water;
- and
- iv) an antifoam agent;
- so as to form a slurry having a density below 1.70 g/cm3;
- and
- (b) pumping the slurry into the well.
6 more elements
Dependencies are inferred from the claim text.