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Borehole tool, procedures, and interpretation for making permeability measurements of subsurface formations

  • US 5,269,180 A
  • Filed: 09/17/1991
  • Issued: 12/14/1993
  • Est. Priority Date: 09/17/1991
  • Status: Expired due to Term
First Claim
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1. A borehole tool for use in an uncased borehole in a formation, comprising:

  • a) a source probe means for making fluid contact with a wall of said borehole;

    b) a fluid flow line for bringing fluids to said source probe;

    c) at least one injection fluid chamber containing one of clean oil and clean water, with said injection fluid chamber being in fluid communication with said fluid flow line;

    d) pressure measurement means for measuring pressure resulting from the injection of said one of clear oil and clean water through said source probe means and into said formation; and

    e) cleaning means for cleaning said source probe means and at least a portion of said fluid flow line prior to the injection of said one of clean oil and clean water into said formation.

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