Reservoir Engineering Lecture: Pore Throat Sorting
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Questions and Answers

Why does the fluid rise to the same height in an area with well-sorted and rounded grains and no clay present?

  • Due to the presence of clay minerals
  • Due to high permeability
  • Due to high capillary pressure
  • Due to low connate water (correct)
  • What is the main reason for lower connate water in areas with higher permeability and well-sorted grains?

  • Presence of clay minerals
  • Higher displacement pressure
  • Poorly sorted grains
  • Lower displacement pressure (correct)
  • In the capillary pressure curve, what does the Pd represent in the context of the drainage process?

  • Fluid rising due to high permeability
  • Effect of PSD on capillary pressure
  • Wetting phase pushing the nonwetting phase
  • Pressure required for wetting phase displacement (correct)
  • What parameter affects capillary pressure along with PSD and permeability in comparing capillary pressure curves from different core samples of a reservoir?

    <p>Pore aperture radius</p> Signup and view all the answers

    What did Leverett aim to achieve by developing a relationship that could combine capillary pressure data from sands of varying porosity and permeability?

    <p>Develop a generalized form for capillary pressure data</p> Signup and view all the answers

    What characteristic allows for the expression of capillary pressure data from sands of varying porosity and permeability values?

    <p>Pore structure and size</p> Signup and view all the answers

    What does the Pore Throat Sorting (PTS) coefficient measure?

    <p>The sorting of pore throats within a rock sample</p> Signup and view all the answers

    In the PTS range of 1.0 to 8.0, what value indicates perfect sorting?

    <p>1.5</p> Signup and view all the answers

    What does a PTS coefficient much greater than 1 indicate?

    <p>Poorly sorted rock sample</p> Signup and view all the answers

    How are the first and third quartile pressures defined in the context of PTS calculation?

    <p>As pressures at 25% and 75% saturation</p> Signup and view all the answers

    What range of values do most rock samples fall within for the Pore Throat Sorting (PTS)?

    <p>1.2 to 5.0</p> Signup and view all the answers

    What does a rapid jump in the capillary pressure curve after crossing the 25% saturation indicate?

    <p>Poorly sorted rock sample</p> Signup and view all the answers

    What does the MICP equation relate?

    <p>Capillary pressure and pore aperture radius</p> Signup and view all the answers

    What is the purpose of the mercury injection process?

    <p>To determine the pore size distribution (PSD) characteristics</p> Signup and view all the answers

    What happens as the applied pressure increases during the mercury injection process?

    <p>The radius of the pores that can be filled with mercury decreases</p> Signup and view all the answers

    What is the relationship between capillary pressure and pore aperture radius according to the MICP equation?

    <p>Capillary pressure is inversely proportional to pore aperture radius</p> Signup and view all the answers

    What is the purpose of plotting the fractional mercury saturation against the pore aperture radius?

    <p>To obtain the pore size distribution (PSD) characteristics</p> Signup and view all the answers

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