Schlumberger Technology Corporation

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Prad Research and Development Limited

Sylvaine Leroy-Delage

Bernard Dargaud

Marc J Thiercelin

Jean-François Baret

Jean-Fran&ccedil;ois Baret

Laure Martin

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.

Cementing compositions and the use of such compositions for cementing wells

The slurries were prepared using a reference slurry having a density of 16.4 lb/gal(US) (1.965 g/cm ) of cement, with porosity of 55.18%. The cement was a class G Dickerhoff North cement. The slurries were prepared in the presence of on agent at a concentration of 0.4% by weight of cemenit (BWOC) and of an anti-foaming agent at a concentration of 0.03 gallons per (94 pound) sack of cement (gps); (a concentration of 0.1 gps corresponds to 0.90 liters of anti-foaming agent per 100 kg of cement). The suspension agent was added to the mixing water, and mixing took place at 4000 revolutions.

Cementing compositions and use of such compositions for cementing oil wells or the like

Growing community of inventors

Paris, France

Sylvaine Leroy-Delage