Cementing compositions and application of such compositions for cementing oil wells or the like
AssigneeSchlumberger Technology Corporation
InventorsBernard Dargaud, Sylvaine Le Roy-Delage, Marc Thiercelin
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Abstract
The present invention provides cementing compositions for oil wells or the like comprising an hydraulic binder and reinforcing particles constituted by a flexible material of low compressibility, and with an average grain size of less than 500 μm. The compositions of the invention are of particular advantage when cementing zones which are subjected to extreme dynamic stresses, such as perforation zones and the junctions of a multi-branch lateral well. They are also highly suitable for producing plugs.
Claims14
A cementing composition, comprising:
- (i) an hydraulic binder;
- and
- (ii) reinforcing particles having an average grain size not exceeding 500 μm, and being formed from a flexible material selected from the group consisting of polyamide, polypropylene, polyethylene, styrene butadiene and styrene divinylbenzene and having a Poisson ratio of more than 0.3;
- and
- (iii) water in sufficient quantity to form a pumpable slurry when mixed with the binder and reinforcing particles.
A well cementing composition, comprising:
- (i) a cement;
- (ii) reinforcing particles having an average grain size in the range 80 μm to 500 μm, and being formed from a flexible material having a Poisson ratio of more than 0.3, the flexible material being selected from the group consisting of polyamide, polypropylene, polyethylene, styrene butadiene and styrene divinylbenzene;
- and
- (iii) water in sufficient quantity to form a pumpable slurry when mixed with the binder and reinforcing particles.
Dependencies are inferred from the claim text.