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Method of production stimulation and enhanced recovery of oil

  • US 4,084,638 A
  • Filed: 10/16/1975
  • Issued: 04/18/1978
  • Est. Priority Date: 10/16/1975
  • Status: Expired due to Term
First Claim
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1. A method of production stimulation and enhanced oil recovery from existing oil wells, comprising the steps of:

  • (a) disposing an insulated high voltage cable within an injection well and embedding a conductive probe at the end of said cable within an oil-bearing stratum;

    (b) disposing an insulating high voltage cable within a recovery well and embedding a probe at the end of said cable within an oil-bearing stratum, said recovery well being between 25 feet and 3,000 feet distance from said injection well;

    (c) connecting a high energy charging and discharge circuit, at the surface level, between each of said cables associated with said injection and recovery wells;

    (d) applying a voltage, current, frequency and pulse width control circuit to said charging and discharge circuit; and

    (e) selectively actuating the above circuitry in order to produce sequential high energy electrical impulses originating at the electrode embedded within the injection well, thereby producing electrical, thermal, physical and sonic shock effects sufficient to produce geological fracturing and, thereby, oil flow between said electrodes.

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