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Microhydraulic fracturing with downhole acoustic measurement

  • US 9,477,002 B2
  • Filed: 04/28/2009
  • Issued: 10/25/2016
  • Est. Priority Date: 12/21/2007
  • Status: Active Grant
First Claim
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1. A system for measuring acoustic signals during a fracturing operation:

  • a downhole toolstring designed and adapted for deployment in a borehole formed within a subterranean rock formation;

    a downhole rock fracturing tool forming part of the toolstring, designed and adapted to open and propagate a fracture in the rock formation using borehole fluid;

    a first and second member designed and positioned to seal a region between the toolstring and a wall of the borehole such that an annular region is defined by the tool housing, the borehole wall, and the first and second members;

    one or more acoustic sources mounted to the toolstring, designed and adapted to transmit acoustic energy into the rock formation and a fluid in the borehole; and

    one or more sensors mounted to the toolstring, designed and adapted to measure an acoustic response of the formation and the fluid, indicative of a parameter of the fracture propagating in the rock formation;

    wherein at least one of the one or more acoustic sources or the one or more acoustic sensors is mounted outside of the annular region.

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