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Methods for Using High-Yielding Non-Newtonian Fluids for Severe Lost Circulation Prevention

  • US 20080147367A1
  • Filed: 07/06/2005
  • Published: 06/19/2008
  • Est. Priority Date: 07/06/2005
  • Status: Active Grant
First Claim
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1. A method of remotely mixing a wellbore fluid and a lost circulation treatment material being pumped into a wellbore where the resulting mixture exhibits non-Newtonian qualities, comprising the steps of:

  • determining a mathematical function relating integral shear history to yield point for a mixture of a lost circulation treatment material and a wellbore fluid using bench top testing;

    modeling downhole integral shear history as a function of flow rate of said lost circulation treatment material being pumped downhole into a given wellbore using a similitude model;

    using said mathematical function to determine a downhole integral shear history to achieve an acceptable downhole yield point for said mixture;

    determining a downhole flow rate of said lost circulation treatment material based on said downhole integral shear history and said modeling action; and

    pumping said lost circulation treatment material downhole into said given wellbore at said determined downhole flow rate.

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