Co-axial well construction technique for hazardous waste assessm

Details Co-axial well construction technique for hazardous waste assessm Co-axial well construction technique for hazardous waste assessm

1996-07-12

1998-09-29

Tsay, Frank

Wells

Processes

Sampling well fluid

166 975, 1662421, E21B 4908, E21B 33047

Patent

active

058134611

ABSTRACT:
A device for use in remediation of a multiplicity of adjacent subsurface geologic strata is described. The device comprises co-axially or concentrically positioned conduits installed in a borehole with an inner conduit extending below an outer conduit through a seal attached to the distal end of the outer conduit. The distal ends of both the outer, upper and the inner, lower conduits are perforated to allow the flow of liquids or gases through the conduits between ground surface and the geologic stratum adjacent to the perforated sections of both conduits. The annular spaces between the borehole wall and the unperforated portions of both the inner and outer conduits are sealed with impermeable barrier plugs to prevent flow parallel to the borehole axis between the borehole wall and the outer surface of the conduits. The annular spaces between the perforated sections of both conduits and the borehole wall is filled with a permeable granular filtration material.

REFERENCES:
patent: 2261292 (1941-11-01), Salnikov
patent: 2885008 (1959-05-01), Hoffer
patent: 2994380 (1961-08-01), Tausch et al.
patent: 3011552 (1961-12-01), Rhodes et al.
patent: 3039535 (1962-06-01), Hathorn et al.
patent: 3195638 (1965-07-01), Rouax
patent: 3976130 (1976-08-01), Chambless et al.
patent: 5092401 (1992-03-01), Heynen

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