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Phase Change Fluid Spring and Method for Use of Same

  • US 20090250224A1
  • Filed: 04/04/2008
  • Published: 10/08/2009
  • Est. Priority Date: 04/04/2008
  • Status: Abandoned Application
First Claim
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1. A tool for use in a testing string disposed in a wellbore and forming an annulus therewith, the tool comprising:

  • a housing defining a central flow conducting passage;

    a circulating valve disposed within the housing operable to control fluid communication between the central flow conducting passage and the exterior of the housing;

    a passageway valve disposed within the central flow conducting passage operable to control fluid flow through the central flow conducting passage; and

    a phase change fluid spring operably associated with the circulating valve and the passageway valve, the phase change fluid spring operates in response to changes in pressure in the annulus, wherein the phase change fluid spring contains a fluid that is in a first phase at a first pressure at the surface and a second phase at a second pressure in the wellbore, the second pressure being greater than the first pressure.

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