17 Questions
Why does the fluid rise to the same height in an area with well-sorted and rounded grains and no clay present?
Due to low connate water
What is the main reason for lower connate water in areas with higher permeability and well-sorted grains?
Lower displacement pressure
In the capillary pressure curve, what does the Pd represent in the context of the drainage process?
Pressure required for wetting phase displacement
What parameter affects capillary pressure along with PSD and permeability in comparing capillary pressure curves from different core samples of a reservoir?
Pore aperture radius
What did Leverett aim to achieve by developing a relationship that could combine capillary pressure data from sands of varying porosity and permeability?
Develop a generalized form for capillary pressure data
What characteristic allows for the expression of capillary pressure data from sands of varying porosity and permeability values?
Pore structure and size
What does the Pore Throat Sorting (PTS) coefficient measure?
The sorting of pore throats within a rock sample
In the PTS range of 1.0 to 8.0, what value indicates perfect sorting?
1.5
What does a PTS coefficient much greater than 1 indicate?
Poorly sorted rock sample
How are the first and third quartile pressures defined in the context of PTS calculation?
As pressures at 25% and 75% saturation
What range of values do most rock samples fall within for the Pore Throat Sorting (PTS)?
1.2 to 5.0
What does a rapid jump in the capillary pressure curve after crossing the 25% saturation indicate?
Poorly sorted rock sample
What does the MICP equation relate?
Capillary pressure and pore aperture radius
What is the purpose of the mercury injection process?
To determine the pore size distribution (PSD) characteristics
What happens as the applied pressure increases during the mercury injection process?
The radius of the pores that can be filled with mercury decreases
What is the relationship between capillary pressure and pore aperture radius according to the MICP equation?
Capillary pressure is inversely proportional to pore aperture radius
What is the purpose of plotting the fractional mercury saturation against the pore aperture radius?
To obtain the pore size distribution (PSD) characteristics
Learn about Pore Throat Sorting (PTS) in reservoir engineering, covering the measurement of pore geometry and sorting of pore throats in rock samples. Explore the concept with examples of sandstone and carbonate samples plotted as pore aperture radius versus fractional mercury saturation.
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