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公开(公告)号：US10975291B2
公开(公告)日：2021-04-13
申请号：US15890459
申请日：2018-02-07
Applicant: Chevron U.S.A. Inc.
Inventor： Cesar Ovalles , Estrella Rogel , Ian Phillip Benson , Ronald A. Behrens
Abstract: In-situ upgrading of heavy hydrocarbons includes injecting into a reservoir solvent, an asphaltene precipitant additive and optionally steam, at a ratio of solvent to heavy hydrocarbon between 0.1:1 and 20:1 under reservoir conditions. The additive has C—H, C—C and/or C—O bonds that thermally crack to generate free radicals in the vapor phase after injection. Formed downhole are a blend containing an upgraded hydrocarbon, and precipitated asphaltenes. The upgraded hydrocarbon is produced such that the precipitated asphaltenes remain in the reservoir. The upgraded hydrocarbon has a greater API gravity, lower asphaltene content, and lower viscosity than the heavy hydrocarbon. The precipitated asphaltenes are present in a higher amount than a similar blend not containing the additive. A method for selecting the additive includes identifying candidate additives having bonds that crack to generate free radicals in the vapor phase at the operating temperature, and calculating percent increase of asphaltenes precipitated for each.
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2.发明申请公开(公告)号：US20190170725A1
公开(公告)日：2019-06-06
申请号：US16272659
申请日：2019-02-11
Applicant: Chevron U.S.A. Inc.
Inventor： Estrella Rogel , Cesar Ovalles , Pak Leung
IPC: G01N33/28
Abstract: Disclosed herein is a method of estimating sediment content of a hydroprocessed hydrocarbon-containing feedstock. The method involves the steps of: (a) precipitating an amount of asphaltenes from a liquid sample of a first hydroprocessed hydrocarbon-containing feedstock having solvated asphaltenes therein with one or more first solvents in a column; (b) determining one or more solubility characteristics of the precipitated asphaltenes; (c) analyzing the one or more solubility characteristics of the precipitated asphaltenes; (d) determining asphaltene content of the liquid sample from the results of analyzing the one or more solubility characteristics of the precipitated asphaltenes; (e) determining one or more asphaltene stability parameters of the liquid sample from the results of analyzing the one or more solubility characteristics of the precipitated asphaltenes; and (f) correlating the asphaltene content and one of the asphaltene stability parameters of the liquid sample to estimate sediment content of the liquid sample.
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公开(公告)号：US12299863B2
公开(公告)日：2025-05-13
申请号：US17384883
申请日：2021-07-26
Applicant: CHEVRON U.S.A. INC.
Inventor： Kaustav Chaudhuri , Thomas M. Rea , Estrella Rogel , Cesar Ovalles , Paul E. Hajdu
Abstract: The present invention is directed to a method for the prediction of coke morphology from feed characteristics using cross-polarized light optical microscopy, image segmentation, and statistical analysis.
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公开(公告)号：US11948666B2
公开(公告)日：2024-04-02
申请号：US17882284
申请日：2022-08-05
Applicant: CHEVRON U.S.A. INC.
Inventor： Estrella Rogel , Toni Miao , Eddy Lee , Kyle Hench
IPC: G01N31/16 , G01N21/3577 , G01N21/359 , G01N33/28 , G16C20/30
CPC classification number: G16C20/30 , G01N21/3577 , G01N21/359 , G01N31/16 , G01N33/2823
Abstract: The present disclosure advantageously refers to systems and methods for predicting an oil mixture's blend compatibility without mixing the components and/or without performing direct blend testing. The techniques described use a correlation between near infrared spectroscopic information, asphaltene solubility parameter Ra, and maltene solubility parameter Po to accurately predict blend compatibility using the equation P=Po(blend)/Ra(blend). A P≥1 indicates the blend is compatible. These techniques are useful in, for example, refineries to predict and therefore reduce or eliminate fouling due to asphaltene deposits.
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公开(公告)号：US20240047017A1
公开(公告)日：2024-02-08
申请号：US17882284
申请日：2022-08-05
Applicant: CHEVRON U.S.A. INC.
Inventor： Estrella Rogel , Toni Miao , Eddy Lee , Kyle Hench
IPC: G16C20/30 , G01N31/16 , G01N21/3577 , G01N21/359 , G01N33/28
CPC classification number: G16C20/30 , G01N31/16 , G01N21/3577 , G01N21/359 , G01N33/2823
Abstract: The present disclosure advantageously refers to systems and methods for predicting an oil mixture's blend compatibility without mixing the components and/or without performing direct blend testing. The techniques described use a correlation between near infrared spectroscopic information, asphaltene solubility parameter Ra, and maltene solubility parameter Po to accurately predict blend compatibility using the equation P=Po(blend)/Ra(blend). A P≥1 indicates the blend is compatible. These techniques are useful in, for example, refineries to predict and therefore reduce or eliminate fouling due to asphaltene deposits.
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Patent Agency Ranking
公开(公告)号：US11236281B2
公开(公告)日：2022-02-01
申请号：US16801374
申请日：2020-02-26
Applicant: CHEVRON U.S.A. INC.
Inventor： Estrella Rogel , Kyle Matthew Hench , Christopher J. Wilson , David A. Dahlin , Michael Moir
Abstract: Low sulfur marine fuel compositions and methods for making the same are provided. The compositions exhibit a sulfur content of at most 0.50 wt. %, a solvent power of at least 0.30, and a P-value of at least 1.15.
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7.发明授权公开(公告)号：US09670760B2
公开(公告)日：2017-06-06
申请号：US14066993
申请日：2013-10-30
Applicant: Chevron U.S.A. Inc.
Inventor： Cesar Ovalles , Estrella Rogel
CPC classification number: E21B43/16 , C09K8/594 , C09K2208/10 , C10G73/38 , C10G2300/302 , C10G2300/4037 , E21B43/28
Abstract: A process for in-situ upgrading of a heavy hydrocarbon includes positioning a well in a reservoir containing a heavy hydrocarbon having an initial API gravity no greater than about 20, an n-heptane asphaltene content at least about 1 wt. %, and a viscosity at 35° C. greater than about 350 centistokes; injecting hydrocarbon solvent(s) and asphaltene precipitant additive(s) into the well at a ratio by volume of the solvent to the heavy hydrocarbon of about 0.1:1 to about 20:1 under reservoir conditions so as to provide an upgraded hydrocarbon in the reservoir having an improved API gravity, a reduced asphaltene content, and a lower viscosity; and producing the upgraded hydrocarbon from the well. The process of the present invention can be also carried out at higher temperatures such as by injecting steam with the one or more hydrocarbon solvents and the one or more asphaltene precipitant additives into the well.
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公开(公告)号：US10907473B2
公开(公告)日：2021-02-02
申请号：US15811972
申请日：2017-11-14
Applicant: Chevron U.S.A. Inc.
Inventor： Estrella Rogel , Cesar Ovalles , Michael Moir
Abstract: A method includes analyzing a carbonaceous deposit for an asphaltene content from a hydrocarbon-containing fluid located in a well, a wellhead or a production line proximate the wellhead, and applying one or more preventative measures to the hydrocarbon-containing fluid located in the well, the wellhead or the production line proximate the wellhead based on the asphaltene content.
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9.发明申请公开(公告)号：US20190241795A1
公开(公告)日：2019-08-08
申请号：US15890459
申请日：2018-02-07
Applicant: Chevron U.S.A. Inc.
Inventor： Cesar Ovalles , Estrella Rogel , Ian Phillip Benson , Ronald A. Behrens
Abstract: In-situ upgrading of heavy hydrocarbons includes injecting into a reservoir solvent, an asphaltene precipitant additive and optionally steam, at a ratio of solvent to heavy hydrocarbon between 0.1:1 and 20:1 under reservoir conditions. The additive has C—H, C—C and/or C—O bonds that thermally crack to generate free radicals in the vapor phase after injection. Formed downhole are a blend containing an upgraded hydrocarbon, and precipitated asphaltenes. The upgraded hydrocarbon is produced such that the precipitated asphaltenes remain in the reservoir. The upgraded hydrocarbon has a greater API gravity, lower asphaltene content, and lower viscosity than the heavy hydrocarbon. The precipitated asphaltenes are present in a higher amount than a similar blend not containing the additive. A method for selecting the additive includes identifying candidate additives having bonds that crack to generate free radicals in the vapor phase at the operating temperature, and calculating percent increase of asphaltenes precipitated for each.
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公开(公告)号：US20190169512A1
公开(公告)日：2019-06-06
申请号：US16272725
申请日：2019-02-11
Applicant: Chevron U.S.A. Inc.
Inventor： Estrella Rogel , Cesar Ovalles , Michael E. Moir
Abstract: A method for determining asphaltene stability in a hydrocarbon-containing material having solvated asphaltenes therein is disclosed. The method involves the steps of: (a) precipitating an amount of the asphaltenes from a liquid sample of the hydrocarbon-containing material with an alkane mobile phase solvent in a column; (b) dissolving a first amount and a second amount of the precipitated asphaltenes by gradually and continuously changing the alkane mobile phase solvent to a final mobile phase solvent having a solubility parameter at least 1 MPa0.5 higher than the alkane mobile phase solvent; (c) monitoring the concentration of eluted fractions from the column; (d) creating a solubility profile of the dissolved asphaltenes in the hydrocarbon-containing material; and (e) determining one or more asphaltene stability parameters of the hydrocarbon-containing material.
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