Method and system for surface production of gas from a subterranean zone
First Claim
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1. A method for producing coal seam gas from a coal seam comprising:
- forming a drainage pattern in a coal seam, the drainage pattern comprising a plurality of auxiliary drainage bores extending from, and arranged in substantially equal and parallel spacing on opposite sides of, a main drainage bore such that the drainage pattern provides substantially uniform coverage of a selected area of the coal seam in which the drainage pattern is located; and
simultaneously removing water and coal seam gas substantially uniformly from the selected area of the coal seam through the drainage pattern.
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Abstract
A method and system for surface production of gas from a subterranean zone includes forming a drainage pattern in a subsurface zone. The drainage pattern includes a plurality of cooperating bores and has a coverage area extending between the cooperating bores. Water pressure is lowered throughout the coverage area of the subsurface zone without significant subsurface drainage by producing water through the cooperating bores of the drainage pattern to the surface. Gas is produced from the coverage area of the subsurface zone with at least some of the water.
378 Citations
20 Claims
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1. A method for producing coal seam gas from a coal seam comprising:
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forming a drainage pattern in a coal seam, the drainage pattern comprising a plurality of auxiliary drainage bores extending from, and arranged in substantially equal and parallel spacing on opposite sides of, a main drainage bore such that the drainage pattern provides substantially uniform coverage of a selected area of the coal seam in which the drainage pattern is located; and simultaneously removing water and coal seam gas substantially uniformly from the selected area of the coal seam through the drainage pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for producing formation gas from a gas bearing formation, comprising:
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forming a drainage pattern in a gas bearing formation, the drainage pattern comprising a plurality of auxiliary drainage bores extending from, and arranged in substantially equal and parallel spacing on opposite sides, a main drainage bore such that the drainage pattern provides substantially uniform coverage of a selected area of the gas bearing formation in which the drainage pattern is located; and simultaneously moving water and formation gas substantially uniformly from the selected area of the gas bearing formation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification