Gas-metering device
First Claim
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1. Apparatus for collecting gas from the ground comprising:
- blower means above ground for generating a negative pressure gradient;
a plurality of wellheads for drawing gas from a plurality of localized areas in the ground to the surface;
a network of lateral pipes on the surface for connecting the wellheads to the blower means, thereby collecting gas from the wellheads using the negative pressure gradient of the blower means; and
means for monitoring the flow rate in each of the wellheads comprising for each wellhead,a metering pipe extending along part of its length within said wellhead such that the end of the metering pipe protrudes from the wellhead and the remainder of the metering pipe lies within the wellhead, the metering pipe having a uniform diameter,means for causing all gas that flows within said wellhead to also flow through said metering pipe to the pipe network, andfirst and second means for sensing pressure at first and second points of said metering pipe, said metering pipe being free of any obstructions between said first and second points.
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Reexamination
Accused Products
Abstract
A metering pipe is telescoped, at least partially, within a pipe through which gas flow rate is to be measured. Gas flow is routed through the metering pipe and is measured by means of pressure sensors monitoring gas pressure therein.
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Citations
5 Claims
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1. Apparatus for collecting gas from the ground comprising:
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blower means above ground for generating a negative pressure gradient; a plurality of wellheads for drawing gas from a plurality of localized areas in the ground to the surface; a network of lateral pipes on the surface for connecting the wellheads to the blower means, thereby collecting gas from the wellheads using the negative pressure gradient of the blower means; and means for monitoring the flow rate in each of the wellheads comprising for each wellhead, a metering pipe extending along part of its length within said wellhead such that the end of the metering pipe protrudes from the wellhead and the remainder of the metering pipe lies within the wellhead, the metering pipe having a uniform diameter, means for causing all gas that flows within said wellhead to also flow through said metering pipe to the pipe network, and first and second means for sensing pressure at first and second points of said metering pipe, said metering pipe being free of any obstructions between said first and second points. - View Dependent Claims (2, 3, 4)
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5. Apparatus for collecting gas from the ground comprising:
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blower means above ground for generating a negative pressure gradient; a plurality of wellheads for drawing gas from a plurality of localized areas in the ground to the surface; a network of lateral pipes on the surface for connecting the wellheads to the blower means, thereby collecting gas from the wellheads using the negative pressure gradient of the blower means; and means for monitoring the flow rate in each of the wellheads comprising for each wellhead, a metering pipe extending along part of its length within said wellhead such that the end of the metering pipe protrudes from the wellhead and the remainder of the metering pipe lies within the wellhead, means for causing all gas that flows within said wellhead to also flow through said metering pipe to the pipe network, the causing means comprising, for each wellhead, a bushing through which the end of the metering pipe protrudes from the wellhead and an elbow that couples the end of the metering pipe to the lateral pipe network, and means for sensing gas flow rate within said metering pipe.
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Specification