Patents by Inventor Slaheddine Kefi
Slaheddine Kefi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11091686Abstract: Well treatment compositions comprise water, a lipophilic anionic surfactant, a hydrophilic non-ionic surfactant, a second non-ionic surfactant, a water-solubilizing solvent, a water-immiscible solvent and a lipophilic non-ionic surfactant. Optionally, a second solvent may be incorporated. When added to spacer fluids, chemical washes or both, the compositions promote the removal of non-aqueous drilling fluids from casing surfaces. Additionally, the treated casing surfaces are water wet, thereby promoting optimal bonding to cement.Type: GrantFiled: January 7, 2016Date of Patent: August 17, 2021Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Quentin Barral, Nicolas Droger, Slaheddine Kefi, Loic Regnault De La Mothe
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Patent number: 9896612Abstract: Method for controlling lost circulation in a subterranean well using oil-dispersible lost-circulation materials which comprise fibers that are coated (or sized) with a lipophilic coupling agent, a lipophilic film-forming polymer or both. The fibers are preferably between about 6 mm and about 25 mm long, and between about 10 ?m and about 200 ?m in diameter. The fibers may be added to carrier fluids comprising oil-base fluids, synthetic-base fluids, invert-emulsion-base fluids and combinations thereof. The preferred fiber concentration in the carrier fluid is between about 0.55 g/L and about 28.5 g/L. The carrier fluid may be a drilling fluid, a spacer fluid or a lost-circulation pill.Type: GrantFiled: December 3, 2010Date of Patent: February 20, 2018Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Slaheddine Kefi, Jesse C. Lee, Chrystel Brunet-Cambus, Nikhil Shindgikar
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Publication number: 20180010032Abstract: Well treatment compositions comprise water, a lipophilic anionic surfactant, a hydrophilic non-ionic surfactant, a second non-ionic surfactant, a water-solubilizing solvent, a water-immiscible solvent and a lipophilic non-ionic surfactant. Optionally, a second solvent may be incorporated. When added to spacer fluids, chemical washes or both, the compositions promote the removal of non-aqueous drilling fluids from casing surfaces. Additionally, the treated casing surfaces are water wet, thereby promoting optimal bonding to cement.Type: ApplicationFiled: January 7, 2016Publication date: January 11, 2018Inventors: Quentin BARRAL, Nicolas DROGER, Slaheddine KEFI, Loic REGNAULT DE LA MOTHE
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Patent number: 9528365Abstract: An apparatus may be used to test the ability of a first fluid to remove a second fluid from a surface. The apparatus comprises a reservoir that contains the first fluid and a testing cell that contains the second fluid. The testing cell also contains a rotor within. The first fluid is pumped into the testing cell, thereby displacing the second fluid. The displaced second fluid flows to a collection vessel. The apparatus is particularly useful for determining the ability of a chemical wash or a spacer fluid to remove non-aqueous drilling fluids from a metallic surface.Type: GrantFiled: May 21, 2014Date of Patent: December 27, 2016Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Quentin Barral, Alice Chougnet-Sirapian, Bernard Dargaud, Nora Bennani, Dominique Zamora, Slaheddine Kefi
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Patent number: 9290689Abstract: A process of making observations of a subterranean reservoir penetrated by a wellbore uses distinguishable sets of tracer particles and comprises steps of: (i) delivering a plurality of sets of tracer particles to respective subterranean locations via the wellbore, the particles in each set comprising a tracer substance which distinguishes that set form the other sets; (ii) causing or allowing the tracer substances to flow out from the tracer particles whilst the particles are at the respective subterranean locations; (iii) causing or allowing production of fluid out of said reservoir via the wellbore; and (iv) detecting the presence or absence of the tracer substances in the produced fluid. The tracer substances are sufficiently distinguishable from each other to enable a tracer substance detected in the produced fluid to identify the set of tracer particles from which it has come and hence identify the location from which it has come.Type: GrantFiled: June 3, 2009Date of Patent: March 22, 2016Assignee: Schlumberger Technology CorporationInventors: Valerie Lafitte, Trevor Hughes, Slaheddine Kefi, Matthew Miller, Gary Tustin, Shiyi Wang
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Publication number: 20160060502Abstract: Well treatment compositions comprise at least one cleavable surfactant. The surfactant may be anionic, nonionic or cationic or a combination thereof. When added to spacer fluids, chemical washes or both, the compositions promote the removal of non-aqueous drilling fluids from casing surfaces. Additionally, the treated casing surfaces are water wet, thereby promoting optimal bonding to cement.Type: ApplicationFiled: April 9, 2013Publication date: March 3, 2016Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventor: Slaheddine Kefi
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Publication number: 20160060500Abstract: Well treatment compositions comprise at least one surfactant, and an ionic liquid, a deep eutectic solvent or both. When added to spacer fluids, chemical washes or both, the compositions promote the removal of non-aqueous drilling fluids from casing surfaces. Additionally, the treated casing surfaces are water wet, thereby promoting optimal bonding to cement.Type: ApplicationFiled: April 9, 2013Publication date: March 3, 2016Inventor: Slaheddine Kefi
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Publication number: 20160060501Abstract: Method for controlling lost circulation in a subterranean well using oil-dispersible lost-circulation materials which comprise fibers that are coated (or sized) with a lipophilic coupling agent, a lipophilic film-forming polymer or both. The fibers are preferably between about 6 mm and about 25 mm long, and between about 10 ?m and about 200 ?m in diameter. The fibers may be added to carrier fluids comprising oil-base fluids, synthetic-base fluids, invert-emulsion-base fluids and combinations thereof. The preferred fiber concentration in the carrier fluid is between about 0.55 g/L and about 28.5 g/L. The carrier fluid may be a drilling fluid, a spacer fluid or a lost-circulation pill.Type: ApplicationFiled: November 10, 2015Publication date: March 3, 2016Inventors: Slaheddine Kefi, Jesse C. Lee, Chrystel Brunet-Cambus, Nikhil Shindgikar
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Patent number: 9206343Abstract: A carbohydrate-based compound is used as a setting accelerator in a pumpable geopolymeric suspension for oil and/or gas industry applications. The suspension further comprises an aluminosilicate source, a carrier fluid, and an activator. The suspensions may be placed in a subterranean well and used for well primary cementing operations and/or remedial applications.Type: GrantFiled: November 10, 2010Date of Patent: December 8, 2015Assignee: Schlumberger Technology CorporationInventors: Elena Pershikova, Olivier Porcherie, Slaheddine Kefi, Yamina Boubeguira, Hafida Achtal
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Publication number: 20150240142Abstract: Well treatment compositions comprise water, a lipophilic anionic surfactant, a hydrophilic non-ionic surfactant, a second non-ionic surfactant and a water-miscible solvent. Optionally, a second solvent may be incorporated. When added to spacer fluids, chemical washes or both, the compositions promote the removal of non-aqueous drilling fluids from casing surfaces. Additionally, the treated casing surfaces are water wet, thereby promoting optimal bonding to cement.Type: ApplicationFiled: April 9, 2013Publication date: August 27, 2015Inventors: Slaheddine Kefi, Nora Bennani, Elena Pershikova Tomilina
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Publication number: 20150159080Abstract: The following describes a novel and alternative mechanism in regards to releasing reactive chemicals. Namely, utilizing shells containing multiple emulsions that can be blended with the base fluids, and then react with said base fluid upon exposure to a trigger e.g. high shear and/or elongation flow, therefore plugging even large fractures. Such gelling lost circulation material allows to obtain a reliable carrier and fast reaction when triggered.Type: ApplicationFiled: February 17, 2015Publication date: June 11, 2015Inventors: Jesse C. Lee, Stephane Boulard, Nikhil Shindgikar, Slaheddine Kefi
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Patent number: 8991497Abstract: The following describes a novel and alternative mechanism in regards to releasing reactive chemicals. Namely, utilizing shells containing multiple emulsions that can be blended with the base fluids, and then react with said base fluid upon exposure to a trigger e.g. high shear and/or elongation flow, therefore plugging even large fractures. Such gelling lost circulation material allows to obtain a reliable carrier and fast reaction when triggered.Type: GrantFiled: February 22, 2012Date of Patent: March 31, 2015Assignee: Schlumberger Technology CorporationInventors: Jesse C. Lee, Stephane Boulard, Nikhil Shindgikar, Slaheddine Kefi
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Publication number: 20140352948Abstract: An apparatus may be used to test the ability of a first fluid to remove a second fluid from a surface. The apparatus comprises a reservoir that contains the first fluid and a testing cell that contains the second fluid. The testing cell also contains a rotor within. The first fluid is pumped into the testing cell, thereby displacing the second fluid. The displaced second fluid flows to a collection vessel. The apparatus is particularly useful for determining the ability of a chemical wash or a spacer fluid to remove non-aqueous drilling fluids from a metallic surface.Type: ApplicationFiled: May 21, 2014Publication date: December 4, 2014Applicant: Schlumberger Technology CorporationInventors: Quentin Barral, Alice Chougnet-Sirapian, Bernard Dargaud, Nora Bennani, Dominique Zamora, Slaheddine Kefi
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Patent number: 8776882Abstract: Mixtures of fibers and solid particles are effective for curing fluid losses and lost circulation in a subterranean well. Stiff fibers are more effective than flexible ones; however, mixtures of stiff and flexible fibers have a synergistic effect. The quantity and particle-size distribution of the solids are optimized according to the stiffness, dimensions and concentrations of fibers.Type: GrantFiled: January 6, 2013Date of Patent: July 15, 2014Assignee: Schlumberger Technology CorporationInventors: Nikhil Shindgikar, Jesse C. Lee, Slaheddine Kefi, Chrystel Brunet-Cambus, Michel Ermel
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Patent number: 8689869Abstract: An encapsulated thixotropy agent may be added to aqueous well service fluids. Such fluids include drilling fluids, cement slurries and polymer pills. The well service fluid may be subjected to shearing action downhole, causing the thixotropy agent to be released and imparting thixotropy to the fluid. The thixotropy agent comprises a dry suspension of synthetic layered silicates.Type: GrantFiled: June 9, 2009Date of Patent: April 8, 2014Assignee: Schlumberger Technology CorporationInventors: Nikhil Shindgikar, Jesse Lee, Slaheddine Kefi
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Patent number: 8535437Abstract: The invention concerns the use of a fluid loss control additive in a pumpable geopolymeric suspension for oil and/or gas industry applications, said suspension further comprising an aluminosilicate source, a carrier fluid, and an activator, and method of providing such a suspension in a borehole. In particular, the suspension according to the invention is used for well primary cementing operations and/or remedial applications.Type: GrantFiled: November 10, 2010Date of Patent: September 17, 2013Assignee: Schlumberger Technology CorporationInventors: Elena Pershikova, Olivier Porcherie, Slaheddine Kefi, Yamina Boubeguira, Hafida Achtal
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Publication number: 20130160998Abstract: Compositions of lost circulation materials are provided that are useful for identifying the location of fluid loss in a wellbore. The compositions include additives which enhance a property of the composition such that they can be detected by an LWD or MWD tool capable of measuring the property when the composition is deployed in a region of loss, and can be distinguished by the LWD or MWD tool from the formation and mud fluid. Methods are also provided for using the composition to detect the location of fluid loss and for controlling the loss of fluid from the wellbore. The methods involve deploying the compositions in loss regions by adding the compositions to drilling mud, and measuring a property of the compositions using an LWD or MWD tool.Type: ApplicationFiled: December 23, 2011Publication date: June 27, 2013Inventors: Francois M. Auzerais, Dzevat Omeragic, Slaheddine Kefi, Dean M. Homan, John P. Horkowitz, Benoit Vidick, Dominique Malard, Robert Utter, Andrew Hawthorn
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Patent number: 8393395Abstract: A process for hydraulic fracturing of a subterranean reservoir formation penetrated by a wellbore includes pumping a fracturing fluid or other aqueous fluid from the surface via the wellbore and into the reservoir. This fluid is an aqueous suspension of particles which each comprise an oilfield chemical distributed within an encapsulating matrix of water-insoluble carrier material. The encapsulating matrix is chosen so as to provide a delayed release of the oilfield chemical from the particles into surrounding fluid, such that oilfield chemical is liberated from the particles after they have entered the fracture. The encapsulating matrix may be a polymer which is at least partially amorphous, with a glass transition temperature below the reservoir temperature.Type: GrantFiled: June 3, 2009Date of Patent: March 12, 2013Assignee: Schlumberger Technology CorporationInventors: Thomas Cochet, Trevor Hughes, Slaheddine Kefi, Valerie Lafitte, Khooi Tan, Gary Tustin, Shiyi Wang
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Patent number: 8371381Abstract: Mixtures of fibers and solid particles are effective for curing fluid losses and lost circulation in a subterranean well. Stiff fibers are more effective than flexible ones; however, mixtures of stiff and flexible fibers have a synergistic effect. The quantity and particle-size distribution of the solids are optimized according to the stiffness, dimensions and concentrations of fibers.Type: GrantFiled: May 19, 2010Date of Patent: February 12, 2013Assignee: Schlumberger Technology CorporationInventors: Nikhil Shindgikar, Jesse Lee, Slaheddine Kefi, Chrystel Cambus-Brunet, Michel Ermel
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Publication number: 20120322695Abstract: Method for controlling lost circulation in a subterranean well using oil-dispersible lost-circulation materials which comprise fibers that are coated (or sized) with a lipophilic coupling agent, a lipophilic film-forming polymer or both. The fibers are preferably between about 6 mm and about 25 mm long, and between about 10 ?m and about 200 ?m in diameter. The fibers may be added to carrier fluids comprising oil-base fluids, synthetic-base fluids, invert-emulsion-base fluids and combinations thereof. The preferred fiber concentration in the carrier fluid is between about 0.55 g/L and about 28.5 g/L. The carrier fluid may be a drilling fluid, a spacer fluid or a lost-circulation pill.Type: ApplicationFiled: December 3, 2010Publication date: December 20, 2012Inventors: Slaheddine Kefi, Jesse C. Lee, Chrystel Brunet-Cambus, Nikhil Shindgikar