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Method of hydrofracture in underground formations

  • US 4,442,895 A
  • Filed: 09/07/1982
  • Issued: 04/17/1984
  • Est. Priority Date: 09/07/1982
  • Status: Expired due to Fees
First Claim
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1. In a method for causing hydrofracture in an underground formation having a borehole extending therethrough and/or thereinto, the steps comprisingdefining an isolated test interval along the borehole with at least one primary packer,defining at least one isolated guard region at one end of the test interval with a guard packer spaced apart from the one primary packer,filling the test interval with a selected fluid and increasing pressure within the test interval to a level for initiating fracture of the formation surrounding the borehole, andsimultaneously and separately monitoring selected conditions such as pressure and/or flow in the test interval and guard region.

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