Recovering energy from a subsurface formation
First Claim
1. A method of recovering energy from a subsurface hydrocarbon containing formation, comprising:
- introducing an oxidizing fluid in a wellbore positioned in at least a first portion of a subsurface hydrocarbon containing formation, wherein at least a part of the first portion of the subsurface hydrocarbon containing formation has been subjected to an in situ heat treatment process prior to introduction of the oxidizing fluid, and wherein the part comprises a treatment area comprising elevated levels of coke substantially adjacent the wellbore;
increasing a pressure in the wellbore by introducing the oxidizing fluid under pressure such that the oxidizing fluid substantially permeates a majority of the treatment area and initiates a combustion process;
allowing heat from the combustion process to transfer to some of the fluids in the treatment area;
decreasing the pressure in the wellbore such that at least some heated fluids from the part of the formation are conveyed into the wellbore; and
transferring the heated fluids conveyed into the wellbore to the surface to a heat exchanger configured to collect thermal energy.
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Accused Products
Abstract
A method of recovering energy from a subsurface hydrocarbon containing formation includes introducing an oxidizing fluid in a wellbore positioned in at least a first portion of the formation. At least a portion of the first portion of the formation has been subjected to an in situ heat treatment process. The portion includes a treatment area having elevated levels of coke substantially adjacent the wellbore. The pressure in the wellbore is increased by introducing the oxidizing fluid under pressure such that the oxidizing fluid substantially permeates a majority of the treatment area and initiates a combustion process. Heat from the combustion process is allowed to transfer to fluids in the treatment area. Pressure decreases in the wellbore such that heated fluids from the portion of the formation are conveyed into the wellbore. The heated fluids are transferred to a heat exchanger configured to collect thermal energy.
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Citations
48 Claims
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1. A method of recovering energy from a subsurface hydrocarbon containing formation, comprising:
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introducing an oxidizing fluid in a wellbore positioned in at least a first portion of a subsurface hydrocarbon containing formation, wherein at least a part of the first portion of the subsurface hydrocarbon containing formation has been subjected to an in situ heat treatment process prior to introduction of the oxidizing fluid, and wherein the part comprises a treatment area comprising elevated levels of coke substantially adjacent the wellbore; increasing a pressure in the wellbore by introducing the oxidizing fluid under pressure such that the oxidizing fluid substantially permeates a majority of the treatment area and initiates a combustion process; allowing heat from the combustion process to transfer to some of the fluids in the treatment area; decreasing the pressure in the wellbore such that at least some heated fluids from the part of the formation are conveyed into the wellbore; and transferring the heated fluids conveyed into the wellbore to the surface to a heat exchanger configured to collect thermal energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of recovering energy from a subsurface hydrocarbon containing formation, comprising:
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introducing an oxidizing fluid in a wellbore positioned in at least a first portion of a subsurface hydrocarbon containing formation, wherein at least a part of the first portion of the subsurface hydrocarbon containing formation has been subjected to an in situ heat treatment process prior to introduction of the oxidizing fluid, and wherein the part comprises a treatment area comprising elevated levels of coke substantially adjacent the wellbore; increasing a pressure in the wellbore by introducing the oxidizing fluid under pressure such that the oxidizing fluid substantially permeates a majority of the treatment area and initiates a combustion process; allowing heat from the combustion process to transfer to fluids in the treatment area; decreasing the pressure in the wellbore such that at least some heated fluids from the treatment area are conveyed into the wellbore; and introducing a heat transfer fluid in the wellbore such that heat is transferred from the wellbore to the heat transfer fluid. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification