Patents by Inventor Manilal S. Dahanayake
Manilal S. Dahanayake 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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Publication number: 20170107423Abstract: Methods of acidizing a subterranean formation penetrated by a wellbore that include the steps of (a) injecting into the wellbore at a pressure below subterranean formation fracturing pressure a treatment fluid having a first viscosity and including an aqueous acid and a gelling agent of Formula II: wherein R1 is (CxHy), wherein x ranges from 17 to 21 and y=2x+1 or 2x?1; R5 is hydrogen or —CH3; R6 is —CH2—CH2—CH2—; and R2, R3, and R4 are each —CH3; (b) forming at least one void in the subterranean formation with the treatment fluid; and (c) allowing the treatment fluid to attain a second viscosity that is greater than the first viscosity.Type: ApplicationFiled: October 14, 2016Publication date: April 20, 2017Applicant: RHODIA OPERATIONSInventors: SueAnn LIM, Rose NDONG, Lingjuan SHEN, Ahmed RABIE, Manilal S. DAHANAYAKE
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Patent number: 9062238Abstract: A method for viscosifying brine systems utilized in oilfield applications comprising: a) preparing a heavy brine system comprising obtaining an aqueous brine system comprising a hydrated polysaccharide and at least one multivalent salt, wherein the density of the aqueous brine system is greater than about 10 pounds per gallon (ppg), and adding an effective amount of an alkaline agent, thereby increasing the viscosity of the brine system.Type: GrantFiled: June 4, 2010Date of Patent: June 23, 2015Assignee: RHODIA OPERATIONSInventors: Subramanian Kesavan, Manilal S. Dahanayake, Gary Woodward
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Patent number: 9035104Abstract: Disclosed are processes relating to the production of polyglycerol ethers of fatty alcohols, in particular, one step process using fatty alcohol and glycerine to synthesize polyglycerides of fatty alcohols will provide a 100% renewable surfactant that is cost effective efficient and CMR free. The synthetic methods mentioned in prior art uses hazardous chemicals as glycidyl ethers, epichlorohydrin that are listed as CMR and known carcinogens and hazardous to handle.Type: GrantFiled: December 15, 2011Date of Patent: May 19, 2015Assignee: Rhodia OperationsInventors: Manilal S. Dahanayake, Andrew Douglass, Robert Lee Reierson
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Patent number: 8985206Abstract: A method for enhancing foam stability in foaming compositions for use in oilfield treatment application, including but not limited to use in mobility control for gas flooding. The method comprises the step of adding to a foaming composition a foam stabilizer of formula (I): wherein R1 is an alkylamido group or a branched or linear alkyl group; R2 and R3 are individually hydrogen or a methyl group; R4, R5 and R6 are individually hydrogen or a hydroxy group, with the proviso that at least one of R4, R5 or R6 is a hydroxyl group; wherein the alkyl group has greater than about 10 carbon atoms. Also disclosed are methods to enhance foam stability in an aqueous foaming composition.Type: GrantFiled: May 11, 2012Date of Patent: March 24, 2015Assignee: Rhodia OperationsInventors: Mikel Morvan, Max Chabert, Manilal S. Dahanayake
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Publication number: 20140005079Abstract: A oil field production fluid, namely a drilling mud composition, comprising a mixture of: (a) at least one base oil component; and (b) an additive component comprising a blend of dibasic esters. The functional fluid can optionally comprise additional additive components. The blend of dibasic esters comprises two or more of dialkyl methylglutarate, dialkyl adipate, dialkyl ethylsuccinate, dialkyl succinate, dialkyl glutarate.Type: ApplicationFiled: June 28, 2013Publication date: January 2, 2014Applicant: RHODIA OPERATIONSInventors: Manilal S. DAHANAYAKE, Subramanian KESAVAN, David FLUCK
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Publication number: 20120285694Abstract: A method for enhancing foam stability in foaming compositions for use in oilfield treatment application, including but not limited to use in mobility control for gas flooding. The method comprises the step of adding to a foaming composition a foam stabilizer of formula (I): wherein R1 is an alkylamido group or a branched or linear alkyl group; R2 and R3 are individually hydrogen or a methyl group; R4, R5 and R6 are individually hydrogen or a hydroxy group, with the proviso that at least one of R4, R5 or R6 is a hydroxyl group; wherein the alkyl group has greater than about 10 carbon atoms. Also disclosed are methods to enhance foam stability in an aqueous foaming composition.Type: ApplicationFiled: May 11, 2012Publication date: November 15, 2012Applicant: RHODIA OPERATIONSInventors: Mikel MORVAN, Max CHABERT, Manilal S. DAHANAYAKE
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Publication number: 20120215031Abstract: Disclosed are processes relating to the production of polyglycerol ethers of fatty alcohols, in particular, one step process using fatty alcohol and glycerine to synthesize polyglycerides of fatty alcohols will provide a 100% renewable surfactant that is cost effective efficient and CMR free. The synthetic methods mentioned in prior art uses hazardous chemicals as glycidyl ethers, epichlorohydrin that are listed as CMR and known carcinogens and hazardous to handle.Type: ApplicationFiled: December 15, 2011Publication date: August 23, 2012Applicant: RHODIA OPERATIONSInventors: Manilal S. Dahanayake, Andrew Douglass, Robert Lee Reierson
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Patent number: 8222194Abstract: An environmentally-friendly cleaning composition for industrial and consumer applications comprising (a) a blend of dibasic esters, (b) one or more surfactants (c) and, optionally, (d) water or a solvent. The dibasic esters are be derived from a blend of adipic, glutaric, and succinic diacids, and, in one particular embodiment, the blend comprises dialkyl adipate, dialkyl methylglutarate and dialkyl ethylsuccinate, wherein the alkyl groups individually comprise a C1-C12 hydrocarbon group. The one or more surfactants are typically chosen from alcohol alkoxylate, an alkyl phenol ethoxylate, a terpene, a terpene alkoxylate or any derivates thereof. Optionally, additional components or additives including delaminates such as pinene and d-limonene, fragrances, whiteners, stabilizers, thickeners and the like can be added to the composition.Type: GrantFiled: May 8, 2009Date of Patent: July 17, 2012Assignee: Rhodia OperationsInventors: Satyen Trivedi, David Fluck, Amit Sehgal, Alexandra Osborne, Manilal S. Dahanayake, Ruela Talingting-Pabalan, Jose Ruiz, Charles Aymes
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Patent number: 8133924Abstract: Demulsifiers containing an anionic surfactant selected from alkylsulfosuccinates, alkylsulfonates, alkylphosphonic acids, and their salts; a nonionic surfactant selected from ethylene oxide/propylene oxide copolymers, ethoxylated fatty acids of polyethylene glycol, terpene alkoxylates, and modified alkanolamides; or a combination of an anionic and a nonionic surfactant, and methods of use thereof in breaking emulsions.Type: GrantFiled: April 2, 2009Date of Patent: March 13, 2012Assignee: Rhodia OperationsInventors: Ruela Talingting-Pabalan, Manilal S. Dahanayake, Gary Woodward, Herve Adam
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Publication number: 20110092398Abstract: Viscoelastic surfactant based aqueous fluid systems useful as thickening agents in various applications, e.g. to suspend particles produced during the excavation of geologic formations. The surfactants are zwitterionic/amphoteric surfactants such as dihydroxyl alkyl glycinate, alkyl ampho acetate or propionate, alkyl betaine, alkyl amidopropyl betaine and alkylimino mono- or di-propionates derived from certain waxes, fats and oils. The thickening agent is used in conjunction with an inorganic water-soluble salt or organic additive such as phthalic acid, salicylic acid or their salts.Type: ApplicationFiled: December 22, 2010Publication date: April 21, 2011Inventors: Manilal S. Dahanayake, Jiang Yang, Joseph H.Y. Niu, Paul Joel Derian, Ruoxin Li, David Dino
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Publication number: 20100311621Abstract: A method for viscosifying brine systems utilized in oilfield applications comprising: a) preparing a heavy brine system comprising obtaining an aqueous brine system comprising a hydrated polysaccharide and at least one multivalent salt, wherein the density of the aqueous brine system is greater than about 10 pounds per gallon (ppg), and adding an effective amount of an alkaline agent, thereby increasing the viscosity of the brine system.Type: ApplicationFiled: June 4, 2010Publication date: December 9, 2010Applicant: Rhodia OperationsInventors: Subramanian Kesavan, Manilal S. Dahanayake, Gary Woodward
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Patent number: 7789143Abstract: There is a method for enhancing the recovery of oil from a reservoir. The method has the step of a) introducing a flooding fluid into the reservoir and b) extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid into the reservoir. The flooding fluid has water and an amount of one or more non-polymeric viscoelastic surfactants sufficient to provide an interfacial surface tension of about 1 mNm or less and a viscosity of about 10 cps or more. The one or more surfactants is selected from the group of one or more cationic surfactants, one or more zwitterionic surfactants, one or more amphoteric surfactants, one or more anionic surfactants, and combinations thereof.Type: GrantFiled: October 30, 2008Date of Patent: September 7, 2010Assignee: Rhodia, Inc.Inventors: Manilal S. Dahanayake, Jean-Pierre Marchand
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Patent number: 7789144Abstract: There is a method for enhancing the recovery of oil from a reservoir. The method has the step of a) introducing a flooding fluid into the reservoir and b) extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid into the reservoir. The flooding fluid has water and an amount of one or more non-polymeric viscoelastic surfactants sufficient to provide an interfacial surface tension of about 1 mNm or less and a viscosity of about 10 cps or more. The one or more surfactants is selected from the group of one or more cationic surfactants, one or more zwitterionic surfactants, one or more amphoteric surfactants, one or more anionic surfactants, and combinations thereof.Type: GrantFiled: October 30, 2008Date of Patent: September 7, 2010Assignee: Rhodia, Inc.Inventors: Manilal S. Dahanayake, Bruno Langlois, Paul-Joel Derian, Jean-Pierre Marchand
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Patent number: 7786179Abstract: Demulsifiers containing an anionic surfactant selected from alkylsulfosuccinates, alkylphosphonic acids, and their salts; a nonionic surfactant selected from ethylene oxide/propylene oxide copolymers, ethoxylated fatty acids of polyethylene glycol, terpene alkoxylates, and modified alkanolamides; and solvent bases comprising blends of dibasic esters. Methods for breaking emulsions using such demulsifiers and solvent bases are also disclosed.Type: GrantFiled: January 7, 2009Date of Patent: August 31, 2010Assignee: Rhodia Inc.Inventors: Ruela Talingting-Pabalan, Gary Woodward, Manilal S. Dahanayake, Herve Adam
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Patent number: 7784540Abstract: There is a method for enhancing the recovery of oil from a reservoir. The method has the step of a) introducing a flooding fluid into the reservoir and b) extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid into the reservoir. The flooding fluid has water and an amount of one or more non-polymeric viscoelastic surfactants sufficient to provide an interfacial surface tension of about 1 mNm or less and a viscosity of about 10 cps or more. The one or more surfactants is selected from the group of one or more cationic surfactants, one or more zwitterionic surfactants, one or more amphoteric surfactants, one or more anionic surfactants, and combinations thereof.Type: GrantFiled: October 30, 2008Date of Patent: August 31, 2010Assignee: Rhodia, Inc.Inventors: Manilal S. Dahanayake, Bruno Langlois, Paul-Joel Derian, Jean-Pierre Marchand
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Patent number: 7779913Abstract: There is a method for enhancing the recovery of oil from a reservoir. The method has the step of a) introducing a flooding fluid into the reservoir and b) extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid into the reservoir. The flooding fluid has water and an amount of one or more non-polymeric viscoelastic surfactants sufficient to provide an interfacial surface tension of about 1 mNm or less and a viscosity of about 10 cps or more. The one or more surfactants is selected from the group of one or more cationic surfactants, one or more zwitterionic surfactants, one or more amphoteric surfactants, one or more anionic surfactants, and combinations thereof.Type: GrantFiled: October 30, 2008Date of Patent: August 24, 2010Assignee: Rhodia, Inc.Inventors: Manilal S. Dahanayake, Bruno Langlois, Paul-Joel Derian, Jean-Pierre Marchand
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Patent number: 7770642Abstract: There is a method for enhancing the recovery of oil from a reservoir. The method has the step of a) introducing a flooding fluid into the reservoir and b) extracting the oil through a wellbore at a location different than the point of introduction of the flooding fluid into the reservoir. The flooding fluid has water and an amount of one or more non-polymeric viscoelastic surfactants sufficient to provide an interfacial surface tension of about 1 mNm or less and a viscosity of about 10 cps or more. The one or more surfactants is selected from the group of one or more cationic surfactants, one or more zwitterionic surfactants, one or more amphoteric surfactants, one or more anionic surfactants, and combinations thereof.Type: GrantFiled: October 30, 2008Date of Patent: August 10, 2010Assignee: Rhodia, Inc.Inventors: Manilal S. Dahanayake, Bruno Langlois, Paul-Joel Derian, Jean-Pierre Marchand
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Patent number: 7629296Abstract: A process of preparing a well servicing fluid comprising viscosifying a heavy brine by contacting with a cationic polysaccharide and a composition thereof.Type: GrantFiled: November 16, 2005Date of Patent: December 8, 2009Assignee: Rhodia Inc.Inventors: Manilal S. Dahanayake, Subramanian Kesavan, Allwyn Colaco
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Publication number: 20090281012Abstract: An environmentally-friendly cleaning composition for industrial and consumer applications comprising (a) a blend of dibasic esters, (b) one or more surfactants (c) and, optionally, (d) water or a solvent. The dibasic esters are be derived from a blend of adipic, glutaric, and succinic diacids, and, in one particular embodiment, the blend comprises dialkyl adipate, dialkyl methylglutarate and dialkyl ethylsuccinate, wherein the alkyl groups individually comprise a C1-C12 hydrocarbon group. The one or more surfactants are typically chosen from alcohol alkoxylate, an alkyl phenol ethoxylate, a terpene, a terpene alkoxylate or any derivates thereof. Optionally, additional components or additives including delaminates such as pinene and d-limonene, fragrances, whiteners, stabilizers, thickeners and the like can be added to the composition.Type: ApplicationFiled: May 8, 2009Publication date: November 12, 2009Applicant: Rhodia Inc.Inventors: Satyen Trivedi, David Fluck, Amit Sehgal, Alexandra Osborne, Manilal S. Dahanayake, Ruela Talingting-Pabalan, Jose Ruiz, Charles Aymes
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Publication number: 20090209664Abstract: Demulsifiers containing an anionic surfactant selected from alkylsulfosuccinates, alkylsulfonates, alkylphosphonic acids, and their salts; a nonionic surfactant selected from ethylene oxide/propylene oxide copolymers, ethoxylated fatty acids of polyethylene glycol, terpene alkoxylates, and modified alkanolamides; or a combination of an anionic and a nonionic surfactant, and methods of use thereof in breaking emulsions.Type: ApplicationFiled: April 2, 2009Publication date: August 20, 2009Applicant: Rhodia Inc.Inventors: Ruela Talingting-Pabalan, Manilal S. Dahanayake, Gary Woodward, Herve Adam