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Method and apparatus for injecting particulate media into the ground

United States Patent

December 28, 2004
View the Complete Patent at the US Patent & Trademark Office
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An improved method and apparatus for injecting particulate media into the ground for constructing underground permeable reactive barriers, which are used for environmental remediation of subsurface contaminated soil and water. A media injector sub-assembly attached to a triple wall drill string pipe sprays a mixture of active particulate media suspended in a carrier fluid radially outwards from the sub-assembly, at the same time that a mixing fluid is sprayed radially outwards. The media spray intersects the mixing spray at a relatively close distance from the point of injection, which entrains the particulate media into the mixing spray and ensures a uniform and deep dispersion of the active media in the surrounding soil. The media injector sub-assembly can optionally include channels for supplying compressed air to an attached down-the-hole hammer drive assembly for use during drilling.
Dwyer; Brian P. (Albuquerque, NM), Dwyer; Stephen F. (Albuquerque, NM), Vigil; Francine S. (Albuquerque, NM), Stewart; Willis E. (W. Richland, WA)
Sandia Corporation (Albuquerque, NM)
10/ 309,502
December 3, 2002
FEDERALLY SPONSORED RESEARCH The United States Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.