Creating and maintaining a gas cap in tar sands formations
First Claim
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1. A method for treating a tar sands formation, comprising:
- providing heat to at least part of a hydrocarbon layer in the formation from one or more heaters located in the formation;
increasing the pressure in an upper portion of the formation with heat provided from one or more of the heaters located in the upper portion, wherein increasing the pressure provides a gas cap in the upper portion; and
producing at least some hydrocarbons from a lower portion of the formation.
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Abstract
Methods for treating a tar sands formation are disclosed herein. Methods for treating a tar sands formation may include providing heat to at least part of a hydrocarbon layer in the formation from one or more heaters located in the formation. Pressure may be allowed to increase in an upper portion of the formation to provide a gas cap in the upper portion. At least some hydrocarbons are produced from a lower portion of the formation.
1117 Citations
23 Claims
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1. A method for treating a tar sands formation, comprising:
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providing heat to at least part of a hydrocarbon layer in the formation from one or more heaters located in the formation; increasing the pressure in an upper portion of the formation with heat provided from one or more of the heaters located in the upper portion, wherein increasing the pressure provides a gas cap in the upper portion; and producing at least some hydrocarbons from a lower portion of the formation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for treating a karsted formation containing heavy hydrocarbons, comprising:
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providing heat to at least part of one or more karsted layers in the formation from one or more heaters located in the karsted layers; allowing a temperature in at least one of the karsted layers to reach a decomposition temperature of dolomite in the formation; allowing the dolomite to decompose and produce carbon dioxide; maintaining the carbon dioxide in the formation to provide a gas cap in an upper portion of at least one of the karsted layers; and producing at least some hydrocarbons from at least one of the karsted layers of the formation. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification