METHOD FOR EXTRACTING LANDFILL GAS
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Abstract
An apparatus and method to internally provide apertures inside polyvinyl chloride (PVC), high density polyethylene (HDPE), or any polymeric pie, plastic pipe-riser (blank casing) in existing landfill gas recovery wells (extraction wells) that have been installed at Municipal Solid Waste Facilities are described. By creating additional apertures in landfill gas recovery well risers, landfill gas derived from the decomposition of waste is allowed to enter the existing riser and extraction/recovery system. This process saves time and cost associated with drilling additional wells to capture landfill gas from subsequent layers of the waste body. The process assists in maintaining regulatory compliance by capturing landfill gas and preventing it from being emitted into the atmosphere.
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Citations
26 Claims
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1-18. -18. (canceled)
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19. A method for producing land fill gas from an existing pipe of a landfill gas recovery well comprising the steps of
(a) transporting a tool, for creating apertures by extending pistons from inside of a housing of the tool to penetrate a wall of the pipe, with a carrier capable of traveling in terrain typical for the location of the landfill gas recovery well; -
(b) positioning the tool within the landfill gas recovery well; (c) lowering the tool to a first preselected depth in the landfill gas recovery well; (d) extending the pistons with a motive fluid pumped from the carrier into the tool to extend the pistons outside the housing of the tool creating apertures in the pipe; (e) retracting the pistons after creating the aperture; (f) re-positioning the tool to a second pre-selected depth of the landfill gas recovery well; (g) repeating steps (d), (e) and (f) until a desired number of apertures are created in the pipe; (h) removing the tool from landfill gas recovery well; and (i) extracting the landfill gas from the landfill gas recovery well with the newly created apertures. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification