Patent ID: 6999883

Claim:
A method of regulating landfill gas well production flow rate comprising: a. installing a constant flow control wellhead assembly gas path in a section of piping between each well, or grouping of wells with a single extraction pipe, and a well extraction vacuum source, b. opening a differential pressure-regulating valve in the wellhead assembly gas path to a nominal position, c. opening a manual valve in the same wellhead assembly gas path partially, d. measuring the differential pressure across the differential pressure-regulating valve, e. adjusting the manual valve position to set the desired differential pressure across the differential pressure-regulating valve, f. measuring the differential pressure equivalent to the entire flow through the wellhead assembly gas path, g. adjusting the differential pressure-regulating valve, as needed, to maintain the desired differential pressure equivalent to the entire flow through the wellhead assembly gas path, h. measuring the gas composition at the wellhead assembly gas path on a periodic basis, i. re-adjusting the differential pressure-regulating valve position periodically, if needed, using the result of the gas composition measurement to determine the desired direction of adjustment, j. measuring the adjusted differential pressure across the differential pressure-regulating valve, k. adjusting the position of the manual valve to obtain the desired differential pressure across the differential pressure-regulating valve, l. measuring the adjusted differential pressure across the complete wellhead assembly gas path, and m. adjusting the regulating valve, as needed, to maintain the desired differential pressure across the complete wellhead assembly gas path.