1
Drochon Bruno, Kefi Slaheddine: Very low-density cement slurry. Schlumberger Technology, Schlumberger Services Petrol, Schlumberger Holdings, September 4, 2002: EP1236701-A1 (97 worldwide citation)

A cement slurry having a density between 750 kg/m and 1,000 kg/m, comprising a solid fraction comprising: either 75% - 90% (by volume) of lightweight particles having a mean particle size between 10 and 60 mu m; 10% - 25% (by volume) of Portland cement having a mean particle size of between 10 and 5 ...


2
Sawdon Christopher Alan, Bailey Louise, Kefi Slaheddine, Phipps Jonathan: Emulsifier-free wellbore fluid. M I, Sawdon Christopher Alan, Bailey Louise, Kefi Slaheddine, Phipps Jonathan, GILL Stephen, June 1, 2006: WO/2006/056774 (5 worldwide citation)

A wellbore fluid is described having a continuous non-aqueous phase and inorganic particles wherein said particles are coated with essentially permanently adsorbed amphiphilic molecules causing a lipophilic behavior of said particles under operating conditions.


3
Maroy Pierre, Kefi Slaheddine, Schulz Joachim, Garnier Andre: Cementing compositions and application of such compositions to cementing oil wells or the like. Sofitech, Dowell Schlumberger Services, December 5, 2001: EP1159234-A1 (3 worldwide citation)

The invention provides a method of cementing an oil well or the like comprising injecting a cement slurry comprising a surfactant, and foaming said slurry before allowing the cement to set. The water content of the slurry used is very low (less than 50 % by volume for systems based on an ordinary ce ...


4
SHINDGIKAR NIKHIL, LEE JESSE, KEFI SLAHEDDINE: [fr] Procédé pour fournir de la thixotropie à des fluides au fond de puits, [de] Verfahren zur unterirdischen Erzeugung von Thixotropie in Flüssigkeiten, [en] Method for providing thixotropy to fluids downhole. SCHLUMBERGER HOLDINGS, Schlumberger Technology, PRAD RES & DEV, SCHLUMBERGER SERVICES PETROL, December 23, 2009: EP2135914-A1 (2 worldwide citation)

[en] A method of providing thixotropy to a fluid downhole comprising: adding an encapsulated thixotropic agent to a fluid at the surface introducing the fluid into a borehole and subjecting the fluid to a shearing action so as to release the thixotropic agent into the fluid.


5

6
SHINDGIKAR NIKHIL, LEE JESSE, KEFI SLAHEDDINE, CAMBUS BRUNET CHRYSTEL, ERMEL MICHEL: [fr] Fibres sophistiquées pour traitements de puits, [de] Fasern nach Mass für Bohrlochbehandlungen, [en] Engineered fibers for well treatments. SCHLUMBERGER SERVICES PETROL, Schlumberger Technology, SCHLUMBERGER HOLDINGS, PRAD RES & DEV, December 15, 2010: EP2261458-A1 (1 worldwide citation)

[en] The present invention pertains to the use of mixtures of fibers and solid particles to cure fluid losses and lost circulation. A method involving such fibers and solid particles is disclosed. The mechanism for curing lost circulation and fluid losses is described in detail.


7
Shindgikar Nikhil, Lee Jesse, Kefi Slaheddine: Method for providing thixotropy to fluids downhole. Services Petroliers Schlumberger, Schlumberger Technology, Schlumberger Holdings, Schlumberger Canada, Prad Research And Development, Shindgikar Nikhil, Lee Jesse, Kefi Slaheddine, Vandermolen Matthieu, December 23, 2009: WO/2009/152989 (1 worldwide citation)

A method of providing thixotropy to a fluid downhole comprising: adding an encapsulated thixotropic agent to a fluid at the surface; introducing the fluid into a borehole; and subjecting the fluid to a shearing action so as to release the thixotropic agent into the fluid.


8
Bruno Drochon, Kefi Slaheddine: Very low-density cement slurry. Sofitech, fan menge wu xiaonan, May 26, 2004: CN01823085 (1 worldwide citation)

A cement slurry having a density between 750 kg/m and 1,000 kg/m, comprising a solid fraction comprising: either 75% - 90% (by volume) of lightweight particles having a mean particle size between 10 and 60 mu m; 10% - 25% (by volume) of Portland cement having a mean particle size of between 10 and 5 ...


9
Maroy Pierre, Schulz Joachim, Kefi Slaheddine, Garnier Andre: Cementing compositions and application of such compositions to cementing oil wells or the like. Schlumberger Cie Dowell, September 1, 2000: FR2790258-A1

The invention provides a method of cementing an oil well or the like comprising injecting a cement slurry comprising a surfactant, and foaming said slurry before allowing the cement to set. The water content of the slurry used is very low (less than 50 % by volume for systems based on an ordinary ce ...


10
Sawdon Christopher Alan, Bailey Louise, Kefi Slaheddine, Phipps Jonathan: Drilling fluid having amphiphilic coated particles. Mi, June 14, 2006: GB2421038-A

A wellbore fluid has a continuous non-aqueous phase and inorganic particles which are coated with permanently adsorbed amphiphilic molecules, such that said molecules cause lipophilic behaviour under operating conditions. The adsorbed molecules may be block copolymers with at least one hydrophilic b ...