Patent ID: 8047276
Filing Date: 2011-11-01
Classification: E21B,E21F

Abstract:
1. An aperture tool for producing landfill gas from the pipe of a landfill gas recovery well comprising a housing with a cavity inside the housing; at least one piston positioned within the cavity having an outer end of the piston capable of extending through an opening in the housing sized to receive the outer end of the piston; a first bore in the housing for providing a channel for flow of motive fluid into and out of the cavity in the housing so that when motive fluid is introduced into the cavity behind the outer end of the piston via the first bore, the fluid provides pressure to the piston and pushes the outer end of the piston through the opening in the housing with sufficient force to create an aperture through the pipe of the landfill recovery well; and a second bore in the housing for providing a channel for flow of motive fluid into and out of the cavity so that when motive fluid is introduced into the cavity via the second bore it provides pressure to the piston and retracts the outer end of the piston through the opening in the housing, wherein the housing is generally spherical in shape.