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Method and apparatus for determining properties of reservoir rock

  • US 5,442,950 A
  • Filed: 10/18/1993
  • Issued: 08/22/1995
  • Est. Priority Date: 10/18/1993
  • Status: Expired due to Term
First Claim
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1. A method for determining pore volume compressibility of a rock sample comprising the steps of:

  • (a) measuring the pore volume of the rock sample at a first pressure;

    (b) varying the external pressure on said rock sample while keeping the pore pressure constant at about atmospheric pressure to attain a second pressure;

    (c) measuring the pore volume of the rock sample at the second pressure;

    (d) defining a log pore volume versus log pressure relation from the pore volume measurements of steps a and c, which relation is linear; and

    (e) determining the pore volume compressibility of the rock sample at any pressure according to ##EQU8## where;

    Cp is the pore volume compressibility,m is the slope of the log pore volume versus log pressure relation, andP is the simulated overburden (external) pressure.

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