In situ oxidation of subsurface formations
First Claim
1. A method for treating a subsurface formation, comprising:
- heating a first portion of the formation from one or more heaters located in the first portion;
producing hydrocarbons from the first portion;
reducing or turning off the heat provided to the first portion after a selected time;
injecting an oxidizing fluid in the first portion to cause a temperature of the first portion to increase sufficiently to oxidize hydrocarbons in the first portion and a third portion of the formation, the third portion being substantially below the first portion;
heating a second portion of the formation from heat transferred from the first portion and/or third portion and/or one or more heaters located in the second portion such that an average temperature in the second portion is at least about 100°
C., wherein the second portion is substantially adjacent to the first portion;
allowing hydrocarbons to flow from the second portion into the first portion and/or third portion;
discontinuing or reducing injection of the oxidizing fluid in the first portion; and
producing additional hydrocarbons from the first portion of the formation, the additional hydrocarbons comprising hydrocarbons oxidized in the first portion, at least some hydrocarbons from the second portion, at least some hydrocarbons from the third portion of the formation, or mixtures thereof, and wherein a temperature of the first portion is below 600°
C.
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Accused Products
Abstract
Methods and systems for treating a hydrocarbon containing formation described herein include providing heat to a first portion of the formation from a plurality of heaters in the first portion, producing produced through one or more production wells in a second portion of the formation, reducing or turning off heat provided to the first portion after a selected time, providing an oxidizing fluid through one or more of the heater wells in the first portion, providing heat to the first portion and the second portion through oxidation of at least some hydrocarbons in the first portion, and producing fluids through at least one of the production wells in the second portion. The produced fluids may include at least some oxidized hydrocarbons produced in the first portion.
1238 Citations
34 Claims
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1. A method for treating a subsurface formation, comprising:
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heating a first portion of the formation from one or more heaters located in the first portion; producing hydrocarbons from the first portion; reducing or turning off the heat provided to the first portion after a selected time; injecting an oxidizing fluid in the first portion to cause a temperature of the first portion to increase sufficiently to oxidize hydrocarbons in the first portion and a third portion of the formation, the third portion being substantially below the first portion; heating a second portion of the formation from heat transferred from the first portion and/or third portion and/or one or more heaters located in the second portion such that an average temperature in the second portion is at least about 100°
C., wherein the second portion is substantially adjacent to the first portion;allowing hydrocarbons to flow from the second portion into the first portion and/or third portion; discontinuing or reducing injection of the oxidizing fluid in the first portion; and producing additional hydrocarbons from the first portion of the formation, the additional hydrocarbons comprising hydrocarbons oxidized in the first portion, at least some hydrocarbons from the second portion, at least some hydrocarbons from the third portion of the formation, or mixtures thereof, and wherein a temperature of the first portion is below 600°
C. - 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 treating a subsurface formation, comprising:
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producing a majority of hydrocarbons from a first portion of the formation and/or a third portion of the formation by in situ heat treatment of the portions, heating a second portion of the formation with one or more heaters to an average temperature of at least about 100°
C., the first portion and third portion being separated by the second portion;reducing or turning off the heat provided to the first portion and/or the third portion after a selected time; injecting an oxidizing fluid in the first portion to cause a temperature of the first portion to increase sufficiently to oxidize hydrocarbons in the first portion; injecting an oxidizing fluid and/or a drive fluid and/or creating a drive fluid in the third portion to cause at least some hydrocarbons to move from the third portion through the second portion to the first portion of the formation; reducing or discontinuing injection of the oxidizing fluid in the first portion; and producing additional hydrocarbons and/or syngas from the first portion of the formation, the additional hydrocarbons and/or syngas comprising at least some hydrocarbons from the second and third portions of the formation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification