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METHOD OF DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS, MEASUREMENT CONTROLLER FOR DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS, AND APPARATUS FOR DOWNHOLE CHARACTERIZATION OF FORMATION FLUIDS

  • US 20100313647A1
  • Filed: 08/02/2010
  • Published: 12/16/2010
  • Est. Priority Date: 09/20/2007
  • Status: Active Grant
First Claim
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1. A measurement controller for downhole characterization of formation fluids which controls a downhole tool,said downhole tool including a flowline for flowing said formation fluids capable of isolating a quantity of said formation fluids in a portion thereof;

  • and a pump unit for depressurizing the isolated formation fluid, comprising;

    a rough value estimation unit which estimates a rough value of a bubble point pressure of said isolated formation fluids; and

    a speed controller which controls the depressurizing speed of said pump unit such that said isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.

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