Patents by Inventor Adwait Chawathe
Adwait Chawathe 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: 10865341Abstract: Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.Type: GrantFiled: April 10, 2019Date of Patent: December 15, 2020Assignee: CHEVRON U.S.A. INC.Inventors: Nariman Fathi Najafabadi, Jagannathan Mahadevan, Adwait Chawathe
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Patent number: 10711177Abstract: Embodiments herein select a brine composition to be injected into a formation to alter wettability at a surface of the formation to enhance recovery of hydrocarbons from the formation. One embodiment comprises providing: a plurality of substrates representative of a formation, a plurality of brine compositions, and a plurality of reducing agents characterized as yielding oxyanions when added to an aqueous stream. The embodiment comprises selecting a brine composition with at least one reducing agent to be injected into the formation to alter wettability at a surface of the formation to enhance recovery of hydrocarbons from the formation and injecting the selected brine composition into the formation to alter wettability at the surface of the formation to enhance recovery of the hydrocarbons from the formation. The brine composition is selected based on interactions between the plurality of substrates, the plurality of brine compositions, and the plurality of reducing agents.Type: GrantFiled: April 10, 2019Date of Patent: July 14, 2020Assignee: CHEVRON U.S.A. INC.Inventors: Adwait Chawathe, Nariman Fathi Najafabadi, Jagannathan Mahadevan
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Publication number: 20190323324Abstract: One embodiment includes generating a polymer partitioning model that determines a concentration of the polymer in a brine phase of the microemulsion system and a concentration of the polymer in an aqueous component of a microemulsion phase of the microemulsion system. The embodiment includes determining a viscosity of the brine phase of the microemulsion system using the concentration of the polymer in the brine phase of the microemulsion system, determining a viscosity of the aqueous component of the microemulsion phase of the microemulsion system using the concentration of the polymer in the aqueous component of the microemulsion phase of the microemulsion system, and determining a viscosity of the microemulsion phase of the microemulsion system using the viscosity of the aqueous component of the microemulsion phase of the microemulsion system. The embodiment includes using determined viscosities to determine performance of a chemical enhanced oil recovery process scenario.Type: ApplicationFiled: April 18, 2019Publication date: October 24, 2019Inventors: Soumyadeep GHOSH, Nariman Fathi NAJAFABADI, Adwait CHAWATHE, Sophany THACH, Anil AMBASTHA
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Publication number: 20190233712Abstract: Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.Type: ApplicationFiled: April 10, 2019Publication date: August 1, 2019Inventors: Nariman FATHI NAJAFABADI, Jagannathan MAHADEVAN, Adwait CHAWATHE
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Publication number: 20190233713Abstract: Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.Type: ApplicationFiled: April 10, 2019Publication date: August 1, 2019Inventors: Adwait CHAWATHE, Nariman FATHI NAJAFABADI, Jagannathan MAHADEVAN
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Patent number: 10301532Abstract: Embodiments to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet are provided. One embodiment comprises providing a formation, providing an aqueous stream for injecting into the formation, adding a reducing agent to the aqueous stream, and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. The embodiment also comprises injecting a second aqueous stream into the formation after injection of the aqueous stream with the reducing agent. The second aqueous stream comprises surfactant, mobility control agent, the reducing agent, or a combination thereof.Type: GrantFiled: March 17, 2016Date of Patent: May 28, 2019Assignee: CHEVRON U.S.A. INC.Inventors: Jagannathan Mahadevan, Nariman Fathi Najafabadi, Adwait Chawathe
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Publication number: 20190138672Abstract: A system and method for characterizing uncertainty in a subterranean fracture network by obtaining a natural fracture network, obtaining dynamic data, simulating hydraulic fracturing and microseismic events based on the natural fracture network and the dynamic data, generating a stimulated reservoir volume (SRV), and quantifying the uncertainty in the SRV. It may also include narrowing the uncertainty in the SRV through the use of Design of Experiment methods and characterizing the SRV using static and/or dynamic data.Type: ApplicationFiled: September 6, 2018Publication date: May 9, 2019Applicant: Chevron U.S.A. Inc.Inventors: Sudipta Sarkar, Adwait Chawathe
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Publication number: 20190079066Abstract: A method for predicting phase behavior includes determining a hydrophilic-lipophilic difference based on a ratio of salinity to optimum salinity in the microemulsion system. The method further includes determining a mean solubilization ratio as a direct function of the hydrophilic-lipophilic difference at a same state as an optimum solubilization. The method also includes predicting phase behavior based on the determined mean solubilization ratio. The method additionally includes injecting a surfactant into a reservoir according to the predicted phase behavior.Type: ApplicationFiled: September 11, 2018Publication date: March 14, 2019Applicant: Chevron U.S.A. Inc.Inventors: Soumyadeep Ghosh, Adwait Chawathe, Sophany Thach
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Patent number: 10208577Abstract: A method, system and computer readable medium is presented for use in enhancing oil recovery in a subsurface reservoir comprising. The method, system and computer readable medium defines a plurality of grid levels on a geological model of a subsurface reservoir. Connectivities and transmissibilities are calculated between neighboring cells in the same grid and between connecting cells between different grid levels. Gas and/or fluid dynamics are simulated using dynamic grid refinement where the connectivities and transmissibilities are updated at each time step based on the previously calculated connectivities and transmissibilities.Type: GrantFiled: October 9, 2013Date of Patent: February 19, 2019Assignee: CHEVRON U.S.A. INC.Inventors: Hussein Hoteit, Adwait Chawathe
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Publication number: 20160272873Abstract: Methods and systems are provided to enhance recovery of hydrocarbons from a formation by altering wettability at a surface of the formation towards more water-wet. One method includes: providing a formation; providing an aqueous stream for injecting into the formation; adding a reducing agent to the aqueous stream; and injecting the aqueous stream with the reducing agent into the formation to alter a surface charge of the surface of the formation to become more water-wet to enhance recovery of hydrocarbons from the formation. The reducing agent is responsive to characteristics of the formation, characteristics of brine of the formation, and characteristics of hydrocarbons of the formation. Also provided is a method to select a brine composition to be injected into a formation to alter wettability at a surface of the formation towards more water-wet to enhance recovery of hydrocarbons from the formation.Type: ApplicationFiled: March 17, 2016Publication date: September 22, 2016Inventors: Jagannathan Mahadevan, Nariman Fathi Najafabadi, Adwait Chawathe
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Publication number: 20150100293Abstract: A method, system and computer readable medium is presented for use in enhancing oil recovery in a subsurface reservoir comprising. The method, system and computer readable medium defines a plurality of grid levels on a geological model of a subsurface reservoir. Connectivities and transmissibilities are calculated between neighboring cells in the same grid and between connecting cells between different grid levels. Gas and/or fluid dynamics are simulated using dynamic grid refinement where the connectivities and transmissibilities are updated at each time step based on the previously calculated connectivities and transmissibilities.Type: ApplicationFiled: October 9, 2013Publication date: April 9, 2015Inventors: Hussein Hoteit, Adwait Chawathe
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Publication number: 20140358510Abstract: A system and method for characterizing uncertainty in a subterranean fracture network by obtaining a natural fracture network, obtaining dynamic data, simulating hydraulic fracturing and microseismic events based on the natural fracture network and the dynamic data, generating a stimulated reservoir volume (SRV), and quantifying the uncertainty in the SRV. It may also include narrowing the uncertainty in the SRV through the use of Design of Experiment methods and characterizing the SRV using static and/or dynamic data.Type: ApplicationFiled: May 29, 2013Publication date: December 4, 2014Applicant: CHEVRON U.S.A. INC.Inventors: Sudipta Sarkar, Adwait Chawathe