Wells – Processes – Graveling or filter forming
Patent
1994-02-22
1995-03-21
Novosad, Stephen J.
Wells
Processes
Graveling or filter forming
166228, 166370, 166372, 210170, 210747, E21B 4318, E21B 4304, B01D 1900
Patent
active
053987578
ABSTRACT:
In accordance with this invention, a well for soil sparging and soil vapor extraction is provided. The well comprises a bore hole extending from the surface of the earth for several feet and preferably to the base of the clay layer. An impervious casing having a larger diameter than the bore hole is mounted concentrically around the bore hole and extends from a point above the surface of the earth to a point below the surface of the earth. The impervious casing is sealed at its top end by a cover plate. An injection tube is inserted into the bore hole wherein the injection tube terminates at a point above the bottom of the bore hole. The bottom most portion of the bore hole is filled with granular material. Above the granular material, the bore hole is filled with packing material that is substantially impervious to liquid and gas. Above the packing material, the remaining space in the bore hole is filled with permeable material which allows passage of gas or liquid. Means is connected to the upper end of the casing for injecting remedial fluid into the injection tube whereby the remedial fluid is introduced into the targeted contaminated soil area. Additionally, means is connected to the upper end of the impervious casing for drawing a vacuum to assist in extraction of volatile contaminants from the surrounding soil through the permeable material. The packing material allows for selectively concentrating remediation at a specified area within the soil.
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Uren, L. C., Petroleum Production Engineering, Oil Field Development, 4th Ed., McGraw-Hill Book Co., N.Y., pp. 398-401.
Brown Adrian
Corte Lawrence J.
K N Energy, Inc.
Novosad Stephen J.
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