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US 4,734,649 AGranted
Apparatus for measuring the resistivity of a sample
AssigneeWestern Atlas International, Inc.
InventorHarold T. Barnaby
Life of this patent
Estimating the term…
Abstract
A core holder is provided for making petrophysical measurements of core samples from a borehole. The core holder is designed to make resistivity measurements and fluid-flow tests under reproduced conditions of in-situ fluid saturation, reservoir pressure and reservoir temperature.
Claims13
An apparatus for measuring the resistivity of a sample having opposite end faces, comprising:
- a barrel having an inner wall surface;
- a flexible sleeve mounted within said barrel, said flexible sleeve having inner and outer wall surfaces, said flexible sleeve defining an annular chamber between the inner wall surface of said barrel and the outer surface of said flexible sleeve;
- upstream and downstream end-cap assembly means for sealing said flexible sleeve against said barrel;
- a first and a second current electrode for electrically contacting the opposite end faces of said sample received by said flexible sleeve;
- a first and a second voltage collector, insulated from said first and second current electrode, mounted outboard of and concentric with said first and second current electrode;
- a first and a second voltage electrode embedded in said flexible sleeve, in spaced-apart relationship, said first and second voltage electrode having laterally spaced-apart contacts arranged flush with the inner wall surface of said flexible sleeve, the spaced apart contacts of each said voltage electrode straddling said first and second current electrode, encircling and contacting the received sample and said first and second voltage collector for electrically coupling said sample with said first and second voltage collector, respectively;
- and
- means for axially and laterally loading said received sample.
5 more elements
An apparatus for measuring the petrophysical characteristics of a sample recovered from a borehole, said sample having been subjected to in-situ reservoir conditions of temperature and pressure, comprising:
- a barrel;
- a flexible sleeve mounted in said barrel, said sleeve being sealed to said barrel at the ends thereof;
- current-electrode means for applying a current through a sample received by said flexible sleeve;
- voltage-electrode means, axially disposed exterior of said current-electrode means, for sensing a potential difference across the received sample due to application of a current therethrough, said voltage-electrode means also being embedded in said sleeve and insulated from said current-electrode means and adapted to extend inboard and around said current-electrode means and engage the received sample;
- means for simulating in said apparatus the in-situ reservoir conditions of interstitial fluid saturation, pressure and temperature to which said sample was originally subjected.
2 more elements
Dependencies are inferred from the claim text.