Systems and methods for generating in-situ carbon dioxide driver gas for use in enhanced oil recovery
First Claim
1. An in-situ apparatus for generating carbon dioxide gas near an oil site for use in enhanced oil recovery, comprising:
- a steam generator adapted to boil and superheat water to generate a source of superheated steam;
a source of essentially pure oxygen;
a steam reformer, located adjacent to the oil site, adapted to react a carbonaceous material with the superheated steam and the pure oxygen, in an absence of air, to generate a driver gas comprising primarily carbon dioxide gas and hydrogen gas, wherein at least a portion of the carbonaceous material is obtained from a location outside the oil site;
a separator adapted to separate at least a portion of the carbon dioxide gas from the driver gas to generate a carbon dioxide-rich driver gas and a hydrogen-rich fuel gas;
a compressor for compressing the carbon dioxide-rich driver gas for use in enhanced oil recovery, wherein the compressed carbon dioxide-rich driver gas, with substantially no oxygen, is injected to a predetermined depth in order to enhance oil recovery at the oil site; and
a control system adapted to control an operation of the apparatus based on a temperature, a pressure, and a gas composition of the driver gas in real-time by controlling an input oxygen-to-steam ratio.
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Accused Products
Abstract
The present invention is an in-situ apparatus for generating carbon dioxide gas at an oil site for use in enhanced oil recovery (EOR). The apparatus includes a steam generator adapted to boil and superheat water to generate a source of superheated steam, as well as a source of essentially pure oxygen. The apparatus also includes a steam reformer adapted to react a carbonaceous material with the superheated steam and the pure oxygen, in an absence of air, to generate a driver gas comprising primarily carbon dioxide gas and hydrogen gas. A separator is adapted to separate at least a portion of the carbon dioxide gas from the rest of the driver gas to generate a carbon dioxide-rich driver gas and a hydrogen-rich fuel gas. A compressor is used for compressing the carbon dioxide-rich driver gas for use in enhanced oil recovery, and the compressed carbon dioxide-rich driver gas, with substantially no oxygen, is injected to a predetermined depth in order to enhance oil recovery at the oil site. Unlike traditional CO2-EOR, which requires large power plants stationed near metropolitan areas and expensive pipeline networks, the in-situ apparatus can be placed or constructed at the site of the oil field, while a portion of the carbonaceous material may be obtained from a site outside the oil field.
213 Citations
20 Claims
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1. An in-situ apparatus for generating carbon dioxide gas near an oil site for use in enhanced oil recovery, comprising:
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a steam generator adapted to boil and superheat water to generate a source of superheated steam; a source of essentially pure oxygen; a steam reformer, located adjacent to the oil site, adapted to react a carbonaceous material with the superheated steam and the pure oxygen, in an absence of air, to generate a driver gas comprising primarily carbon dioxide gas and hydrogen gas, wherein at least a portion of the carbonaceous material is obtained from a location outside the oil site; a separator adapted to separate at least a portion of the carbon dioxide gas from the driver gas to generate a carbon dioxide-rich driver gas and a hydrogen-rich fuel gas; a compressor for compressing the carbon dioxide-rich driver gas for use in enhanced oil recovery, wherein the compressed carbon dioxide-rich driver gas, with substantially no oxygen, is injected to a predetermined depth in order to enhance oil recovery at the oil site; and a control system adapted to control an operation of the apparatus based on a temperature, a pressure, and a gas composition of the driver gas in real-time by controlling an input oxygen-to-steam ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for generating carbon dioxide gas near an oil site for use in enhanced oil recovery, comprising:
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providing a source of superheated steam; providing a source of essentially pure oxygen; controlling an input oxygen-to-steam ratio based on a temperature, a pressure, and a gas composition of a driver gas in real-time; steam reforming a carbonaceous material with the superheated steam and the pure oxygen to generate a driver gas comprising primarily carbon dioxide gas and hydrogen gas, wherein the steam reforming reaction is performed adjacent to the oil site and in an absence of air; separating at least a portion of the carbon dioxide gas from the driver gas to generate a carbon dioxide-rich driver gas and a hydrogen-rich fuel gas; compressing the carbon dioxide-rich driver gas for use in enhanced oil recovery; and injecting the compressed portion of the carbon dioxide-rich driver gas, with substantially no oxygen, to a predetermined depth in order to enhance oil recovery at the oil site. - View Dependent Claims (17, 18, 19)
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20. An in-situ apparatus for generating carbon dioxide gas near an oil site for use in enhanced oil recovery, comprising:
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a steam generator adapted to boil and superheat water to generate a source of superheated steam; a source of essentially pure oxygen; a steam reformer, located adjacent to the oil site, adapted to react a carbonaceous material with the superheated steam and the pure oxygen, in an absence of air, to generate a driver gas comprising primarily carbon dioxide gas and hydrogen gas, wherein at least a portion of the carbonaceous material is obtained from a location outside the oil site; a separator adapted to separate at least a portion of the carbon dioxide gas from the driver gas to generate a carbon dioxide-rich driver gas and a hydrogen-rich fuel gas, wherein the separator is a methanol-based separator operating in a temperature-swing cycle between approximately −
60°
C. and +40°
C., or a pressure-swing cycle between approximately 1 bar and 100 bar.
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Specification