Accelerated production of gas from a subterranean zone
First Claim
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1. A method for surface production of gas from a subterranean zone, comprising:
- lowering reservoir pressure in an area of a subterranean zone having a medium to low effective permeability through a multi-branching well bore pattern providing a drainage network for the area;
producing gas from the area of the subterranean zone in two-phase flow with water from the area;
producing twenty-five percent of total gas in the area of the subterranean zone within three years of a start of production; and
wherein the subterranean zone comprises a coal bed.
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Abstract
A method and system for surface production of gas from a subterranean zone includes lowering reservoir pressure in an area of a subterranean zone having a medium to low effective permeability through a multi-branching well bore pattern. At least twenty-five percent of the total gas in the area of the subterranean zone is produced within three years of the start of production.
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Citations
139 Claims
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1. A method for surface production of gas from a subterranean zone, comprising:
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lowering reservoir pressure in an area of a subterranean zone having a medium to low effective permeability through a multi-branching well bore pattern providing a drainage network for the area; producing gas from the area of the subterranean zone in two-phase flow with water from the area; producing twenty-five percent of total gas in the area of the subterranean zone within three years of a start of production; and wherein the subterranean zone comprises a coal bed. - 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, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104)
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105. A method for producing gas from a tight coal formation, comprising:
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using a well bore pattern providing coverage of an area of a coal seam having an effective permeability below seven millidarcies to remove water from the area of the coal seam; and removing a sufficient volume of water from the area of the coal seam to obtain at substantially continuous flow conditions and within two years of a start of water production a gas production peak rate having a decline that reaches one-third of the peak rate after at least twenty-five percent of gas in the area has been produced, wherein at least a portion of the gas is produced in a two-phase flow with at least some of the water from the area of the coal seam. - View Dependent Claims (106, 107, 108, 109, 110, 111, 112, 113, 114, 115)
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116. A method for producing gas from a tight coal formation, comprising:
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using a well bore pattern providing coverage of an area of a coal seam having an effective permeability below seven millidarcies to remove water from the area of the coal seam; and removing a sufficient volume of water from the area of the coal seam to obtain at substantially continuous flow conditions and within two years of a start of water production a gas production peak rate having an exponential decline that reaches one-quarter of the gas production peak rate after at least thirty percent of gas in the area has been produced, wherein at least a portion of the gas is produced in a two-phase flow with at least some of the water from the area of the coal seam. - View Dependent Claims (117, 118, 119, 120)
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121. A method for surface production of gas from a subterranean zone, comprising:
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lowering water pressure throughout an area of a subterranean zone having a medium to low effective permeability by removing water from the area through a well bore pattern providing coverage of the area to the surface; producing gas from the area of the subterranean zone in two-phase flow with at least some of the water from the area; producing gas in a self-sustaining flow from the area of the subterranean zone within two years of a start of water production; and wherein the subterranean zone comprises a coal bed. - View Dependent Claims (122, 123, 124, 125, 126)
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127. A method for surface production of gas from a subterranean zone, comprising:
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providing a well bore pattern in a subterranean zone having a medium to low effective permeability, the well bore pattern comprising at least one bore and providing coverage of an area of the subterranean zone; lowering water pressure in the area of the subterranean zone by using gas lift to produce to the surface at least some water collected by the well bore pattern from the subterranean zone; producing gas from the area of the subterranean zone in two-phase flow with at least some water from the area; and wherein the subterranean zone comprises a coal bed. - View Dependent Claims (128, 129)
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130. A method for surface production of gas from a coal seam, comprising:
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providing an onini-directional horizontal well bore pattern in a medium to low effective permeability coal seam, the well bore pattern providing coverage of an area of the coal seam and operable to intersect a substantial number of natural fractures in the area of the coal seam; producing gas from the area of the coal seam in two-phase flow with water from the area; and obtaining a majority of gas from the area into the well bore pattern from the natural fractures intersecting the well bore pattern. - View Dependent Claims (131, 132, 133, 134, 135, 136)
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137. A method for surface production of gas from a subterranean coal seam, comprising;
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providing an omni-directional horizontal well bore pattern operable to intersect a number of natural fractures in a coal seam having medium to low effective permeability; producing gas from an area of the coal seam covered by the well bore pattern in two-phase flow with water from the area; and producing thirty percent of gas from the area of the coal seam covered by the well bore pattern while relative permeability of coal to gas of a matrix coal in the coal seam remains below ten percent of absolute permeability. - View Dependent Claims (138)
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139. A method for surface production of gas from a subterranean zone, comprising:
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forming a horizontal drainage pattern in a subterranean zone having a medium to low effective permeability; the horizontal drainage pattern including a plurality of cooperation bores and connected to a surface well bore; collecting fluids from an area of the subterranean zone covered by the horizontal drainage pattern through the horizontal drainage pattern, the area comprising at least one hundred acres; producing fluids collected from the subterranean zone to the surface through the surface well bore; and producing twenty-five percent of total gas in the area of the subsurface zone within two years of the start of water production.
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Specification