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Method and apparatus for actuating a downhole device carried by a pipe string

  • US 3,967,680 A
  • Filed: 08/01/1974
  • Issued: 07/06/1976
  • Est. Priority Date: 08/01/1974
  • Status: Expired due to Term
First Claim
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1. A method for selectively actuating downhole devices carried by a pipe string comprising;

  • the establishment of a preselected rotation rate of said pipe string to select the function, for subsequent execution, to be carried out down hole, then changing the rate of flow of fluid through said pipe string from one preselected rate to another to cause execution of the function, then changing at least one of said rates to another value to secure the selected function against further change.

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