Cementing compositions and applications of such compositions for cementing oil wells or the like
AssigneeSchlumberger Technology Corporation
InventorsSylvaine Le Roy-Delage, Marc Thiercelin
Life of this patent
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Abstract
The present invention provides cementing compositions for an oil well or the like, comprising an hydraulic binder, dense particles with a density higher than the density of the hydraulic binder, and reinforcing particles with a density of less than 1.5 g/cm3, preferably less than 1.2 g/cm3, constituted by a flexible material or rubber, of low compressibility and with an average grain size of less than 600 μm. The compositions of the invention are of particular advantage when preventing zones which are subjected to extreme stresses, such as perforation zones and the junctions of a multi-branch lateral well. They are also highly suitable for producing plugs.
Claims16
A method of cementing a zone of a well, comprising pumping into the well a cementing composition which comprises:
- (i) a hydraulic binder;
- (ii) a particulate material that has a specific gravity of greater than 3;
- and
- (iii) reinforcing particles which:
- comprise a flexible material;
- have a density of less than about 1.5 g/cm3;
- have a Poisson ratio of more than 0.3;
- and
- have an average grain size of less than about 600 μm.
A method of setting a cement plug in a well, comprising pumping into the well a cementing composition which comprises:
- (i) a hydraulic binder;
- (ii) a particulate material that has a specific gravity of greater than 3;
- and
- (iii) reinforcing particles which:
- comprise a flexible material;
- have a density of less than about 1.5 g/cm3;
- have a Poisson ratio of more than 0.3;
- and
- have an average grain size of less than about 600 μm.
Dependencies are inferred from the claim text.