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公开(公告)号：US12208297B2
公开(公告)日：2025-01-28
申请号：US18590894
申请日：2024-02-28
Applicant: Chevron U.S.A. Inc.
Inventor： Thomas P. Hoelen , Cesar Ovalles , Adam J. Dassey , Carl W. Lam , Russell E. Cooper , Janelle L. Lewis
Abstract: Disclosed are systems and methods for treating contaminated material. The material is heated by nonconductive and nonconvective heating in a vacuum chamber such that the surface of the material is heated without significant heating of the air within the chamber. The surface of the material is heated to at least a volatilization temperature of the contaminants or to a decomposition temperature of one or more compounds in intimate contact with the contaminants, so that the concentration of contaminants in the material is reduced. Exhaust is removed from the chamber and cooled. A solids and/or liquids collector removes condensed solids and/or liquids and has a gas outlet connected to a vacuum pump.
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公开(公告)号：US20190112906A1
公开(公告)日：2019-04-18
申请号：US15783640
申请日：2017-10-13
Applicant: Chevron U.S.A. Inc.
Inventor： Gunther H. Dieckmann , Michal Mieczyslaw Okoniewski , Cesar Ovalles , Pedro Vaca , James Dunlavey , Donald Kuehne
Abstract: Embodiments include drilling a wellbore in a hydrocarbon-bearing formation, and the wellbore includes a radio frequency antenna destination portion that is configured to receive a radio frequency antenna; forming a low dielectric zone in the hydrocarbon-bearing formation proximate to the radio frequency antenna destination portion with a cavity based process or a squeezing based process; positioning the radio frequency antenna into the radio frequency antenna destination portion such that the radio frequency antenna is proximate to the low dielectric zone; dielectric heating the hydrocarbon-bearing formation with the radio frequency antenna such that the low dielectric zone increases dissipation of energy from the radio frequency antenna into the hydrocarbon-bearing formation; and extracting hydrocarbons from the heated hydrocarbon-bearing formation. The material has a dielectric constant of less than or equal to 20, a loss tangent of less than or equal to 0.4, and a porosity of less than or equal to 5%.
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3.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：US20160376883A1
公开(公告)日：2016-12-29
申请号：US15192210
申请日：2016-06-24
Applicant: Chevron U.S.A. Inc.
Inventor： Gunther H. Dieckmann , Cesar Ovalles
CPC classification number: E21B43/2401 , H05B6/62 , H05B2214/03
Abstract: Systems and methods are provided for maintaining the performance and operational stability of an RF (radio frequency) antenna that is positioned in a hydrocarbon-bearing formation, for heating the formation using electromagnetic energy in the radio frequency range.Contaminants such as water or brine, metallic particulates and ionic or organic materials frequently occur in a wellbore being prepared for RF heating, or in an RF antenna installed in the wellbore. Prior to applying RF electrical energy to the formation, the antenna is decontaminated by circulating a preconditioning fluid through the antenna and recovering a spent fluid for treating and recycle. Decontamination is continued while the spent fluid from the antenna includes, but not limited to, water, metallic particles, ionic species, organic compounds contaminants, etc. An operational power level of radio frequency electrical energy is then applied to the decontaminated antenna for providing thermal energy to the hydrocarbon-bearing formation.
Abstract translation: 污染物例如水或盐水，金属微粒和离子或有机材料经常发生在准备用于RF加热的井筒中，或在安装在井眼中的RF天线中。 在将RF电能应用于地层之前，通过使预处理流体循环通过天线并且回收用于处理和再循环的废流体来对天线进行净化。 去污是继续的，而来自天线的废流包括但不限于水，金属颗粒，离子物质，有机化合物污染物等。然后将射频电能的工作功率水平施加到去污天线上以提供热 能量到含烃地层。
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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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Patent Agency Ranking
公开(公告)号：US10704371B2
公开(公告)日：2020-07-07
申请号：US15783640
申请日：2017-10-13
Applicant: Chevron U.S.A. Inc.
Inventor： Gunther H. Dieckmann , Michal Mieczyslaw Okoniewski , Cesar Ovalles , Pedro Vaca , James Dunlavey , Donald Kuehne
Abstract: Embodiments include drilling a wellbore in a hydrocarbon-bearing formation, and the wellbore includes a radio frequency antenna destination portion that is configured to receive a radio frequency antenna; forming a low dielectric zone in the hydrocarbon-bearing formation proximate to the radio frequency antenna destination portion with a cavity based process or a squeezing based process; positioning the radio frequency antenna into the radio frequency antenna destination portion such that the radio frequency antenna is proximate to the low dielectric zone; dielectric heating the hydrocarbon-bearing formation with the radio frequency antenna such that the low dielectric zone increases dissipation of energy from the radio frequency antenna into the hydrocarbon-bearing formation; and extracting hydrocarbons from the heated hydrocarbon-bearing formation. The material has a dielectric constant of less than or equal to 20, a loss tangent of less than or equal to 0.4, and a porosity of less than or equal to 5%.
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公开(公告)号：US20240424334A1
公开(公告)日：2024-12-26
申请号：US18590894
申请日：2024-02-28
Applicant: Chevron U.S.A. Inc.
Inventor： Thomas P. Hoelen , Cesar Ovalles , Adam J. Dassey , Carl W. Lam , Russell E. Cooper , Janelle L. Lewis
Abstract: Disclosed are systems and methods for treating contaminated material. The material is heated by nonconductive and nonconvective heating in a vacuum chamber such that the surface of the material is heated without significant heating of the air within the chamber. The surface of the material is heated to at least a volatilization temperature of the contaminants or to a decomposition temperature of one or more compounds in intimate contact with the contaminants, so that the concentration of contaminants in the material is reduced. Exhaust is removed from the chamber and cooled. A solids and/or liquids collector removes condensed solids and/or liquids and has a gas outlet connected to a vacuum pump.
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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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9.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：US10184330B2
公开(公告)日：2019-01-22
申请号：US15192210
申请日：2016-06-24
Applicant: Chevron U.S.A. Inc.
Inventor： Gunther H. Dieckmann , Cesar Ovalles
Abstract: Systems and methods are provided for maintaining the performance and operational stability of an RF (radio frequency) antenna that is positioned in a hydrocarbon-bearing formation, for heating the formation using electromagnetic energy in the radio frequency range. Contaminants such as water or brine, metallic particulates and ionic or organic materials frequently occur in a wellbore being prepared for RF heating, or in an RF antenna installed in the wellbore. Prior to applying RF electrical energy to the formation, the antenna is decontaminated by circulating a preconditioning fluid through the antenna and recovering a spent fluid for treating and recycle. Decontamination is continued while the spent fluid from the antenna includes, but not limited to, water, metallic particles, ionic species, organic compounds contaminants, etc. An operational power level of radio frequency electrical energy is then applied to the decontaminated antenna for providing thermal energy to the hydrocarbon-bearing formation.
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