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Method of coating core samples

  • US 4,419,314 A
  • Filed: 05/26/1981
  • Issued: 12/06/1983
  • Est. Priority Date: 05/26/1981
  • Status: Expired due to Term
First Claim
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1. A method of preparing a geological core sample containing pore spaces and representative of an underground formation from which the sample is taken to prepare the core sample for testing in testing apparatus in which pressures are applied to the core sample to simulate approximate overburden pressure to which the sample material was subjected in its underground formation, the method comprising;

  • applying a petroleum based release material to the exterior surface of the core sample;

    partially filling a mold with a plastic mixture of hardenable epoxy resin and hardener therefor;

    inserting one end of said core sample into the partially filled mold, the space between said sample and the interior of said mold lying within the range of from about 0.010 cm. to about 0.050 cm, to form a plastic coating on said sample substantially free of voids and having a thickness within said range so that the plastic coating on the thus coated sample is sufficiently thick and stiff to prevent intrusion into the pores of the core sample during testing of the core sample under confining pressure yet is sufficiently thin to transmit the confining pressure to the sample;

    applying a sufficient pressure to the opposite end of the core sample to slowly urge said sample into said mold until the plastic mixture therein covers the entire surface of said sample;

    curing the plastic material for a period of time sufficient to form a stiff coating on the core sample;

    removing the thus-coated core sample from said mold; and

    cutting off the ends of the core sample to remove the coating from said ends.

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