Systems and methods for treating a subsurface formation with electrical conductors
First Claim
1. A system for treating a subsurface formation, comprising:
- a wellbore at least partially located in a hydrocarbon containing formation, the wellbore comprising a substantially vertical portion and at least two substantially horizontal or inclined portions coupled to the vertical portion;
a single, first elongated conductor extending continuously along a length of a first of the two substantially horizontal or inclined portions of the wellbore, wherein the first elongated conductor comprises electrically conductive material along a length of the first elongated conductor;
a single, second elongated conductor extending continuously along a length of a second of the two substantially horizontal or inclined portions of the wellbore, wherein the second elongated conductor comprises electrically conductive material along a length of the second elongated conductor, and wherein at least a portion of the first elongated conductor and at least a portion of the second elongated conductor are vertically displaced in the formation;
wherein the first elongated conductor and the second elongated conductor comprise substantially vertical portions positioned adjacent and non-concentric in the substantially vertical portion of the wellbore with current flow in the substantially vertical portion of the first elongated conductor approximately equal and opposite to current flow in the substantially vertical portion of the second elongated conductor; and
a power supply coupled to at least the first conductor, the power supply configured to electrically excite the electrically conductive materials of the first elongated conductor such that current flows between the electrically conductive materials in the first elongated conductor, through at least a portion of the formation, to the electrically conductive materials in the second elongated conductor, and the current resistively heats at least a portion of the formation between the two substantially horizontally oriented or inclined portions of the wellbore.
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Accused Products
Abstract
A system for treating a subsurface formation includes a wellbore at least partially located in a hydrocarbon containing formation. The wellbore includes a substantially vertical portion and at least two substantially horizontal or inclined portions coupled to the vertical portion. A first conductor is at least partially positioned in a first of the two substantially horizontal or inclined portions of the wellbore. At least the first conductor includes electrically conductive material. A power supply electrically excites the electrically conductive materials of the first conductor such that current flows between the electrically conductive materials in the first conductor, through at least a portion of the formation, to a second conductor at least partially positioned in a second of the two substantially horizontal or inclined portions of the wellbore. The current resistively heats at least a portion of the formation between the two substantially horizontally oriented or inclined portions of the wellbore.
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Citations
38 Claims
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1. A system for treating a subsurface formation, comprising:
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a wellbore at least partially located in a hydrocarbon containing formation, the wellbore comprising a substantially vertical portion and at least two substantially horizontal or inclined portions coupled to the vertical portion; a single, first elongated conductor extending continuously along a length of a first of the two substantially horizontal or inclined portions of the wellbore, wherein the first elongated conductor comprises electrically conductive material along a length of the first elongated conductor; a single, second elongated conductor extending continuously along a length of a second of the two substantially horizontal or inclined portions of the wellbore, wherein the second elongated conductor comprises electrically conductive material along a length of the second elongated conductor, and wherein at least a portion of the first elongated conductor and at least a portion of the second elongated conductor are vertically displaced in the formation; wherein the first elongated conductor and the second elongated conductor comprise substantially vertical portions positioned adjacent and non-concentric in the substantially vertical portion of the wellbore with current flow in the substantially vertical portion of the first elongated conductor approximately equal and opposite to current flow in the substantially vertical portion of the second elongated conductor; and a power supply coupled to at least the first conductor, the power supply configured to electrically excite the electrically conductive materials of the first elongated conductor such that current flows between the electrically conductive materials in the first elongated conductor, through at least a portion of the formation, to the electrically conductive materials in the second elongated conductor, and the current resistively heats at least a portion of the formation between the two substantially horizontally oriented or inclined portions of the wellbore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 29, 30, 31, 32, 33, 34)
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17. A method for treating a subsurface formation, comprising:
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providing electrical current to a first elongated conductor in a first substantially horizontal or inclined position in a section of the formation such that electrical current flows in substantially one direction from the first substantially horizontal or inclined position to a second substantially horizontal or inclined position in the section of the formation with a second elongated conductor in the second substantially horizontal or inclined position, wherein the first elongated conductor is located in a common wellbore with a substantially vertical portion and a substantially horizontal or inclined portion extending from an end of the vertical portion, wherein the second elongated conductor is located in a substantially horizontal or inclined portion coupled to the vertical portion of the common wellbore above the end of the vertical portion, wherein the first elongated conductor and the second elongated conductor comprise substantially vertical portions positioned adjacent and non-concentric in the vertical portion of the common wellbore with current flow in the substantially vertical portion of the first elongated conductor approximately equal and opposite to current flow in the substantially vertical portion of the second elongated conductor, and wherein at least a portion of the first elongated conductor and at least a portion of the second elongated conductor are vertically displaced in the formation, wherein the first elongated conductor comprises a single, elongated conductor extending continuously along the length of the wellbore portion; and heating a least a portion of the hydrocarbon layer between the first and second elongated conductors with heat generated by the electrical current flow. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 35, 36, 37, 38)
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Specification