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Reservoir Fluid Properties > test 3 > Flashcards

test 3 Flashcards

1
Q

The _____phase has a greater tendency than the gas to wet the solid.

A
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2
Q

why is 2 phase analysis satisfactory

A
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3
Q

what are the curved lines

A

relative permeability

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4
Q

describe this chart

A
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5
Q

If the porous medium is assumed to be a bundle of capillary tubes of various radii, then the capillary-pressure-saturation curve relates ____________

A
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6
Q

describe how to measure kr in the lab using the unsteady state method

A
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7
Q

how is permeability of oil reported with the saturation of oil is 60% and water 13%

A
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8
Q

what is the drainage curve

A
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9
Q

what is the equation for gas saturation at the outflow during the Welge method of measuring kr

A
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10
Q

describe the shape of the graph

A
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11
Q

Its not possible to measure ______ directly in the reservoir

A
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12
Q

a wettability number of zero means what

A
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13
Q

________ is a generalized form of Darcy’s law which describes simultaneous flow of two or more immiscible fluids.

A
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14
Q

what is point 3 on this curve

A
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15
Q

•Darcy’s law, originally formulated and developed to apply when the porous medium was ___saturated with a ____ , ______ fluid.

A
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16
Q

what are the assumptions in the Welge method of measuring kr

A
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17
Q

if you were to graph the size distribution of the poor size, what would be the distrbution for each of the graphs below

A

unimodel/bimodal vs. trimodal+

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18
Q

effective permeability is measured in the ___

A
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19
Q

As the saturation of the nonwetting phase increases, the average pore size saturated with wetting fluid becomes …

A
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20
Q

The area under the right curve gives you what?

A

permeability of sample

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21
Q

what is point 5 on this curve

A
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22
Q

At lower water saturations the oil occupies _____ of the smaller pores.

A
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23
Q

a wettability number of 1 means what

A
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24
Q

describe this graph

A
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25
Q

what factors affect kr data

A
  1. ) Wetting characteristics of the system can affect the data.
  2. ) Saturation history is important in obtaining the curves, and relevant curve to the reservoir should be applied.
  3. ) Pore size and pore geometry of the medium
  4. ) The connate water saturation.
  5. ) The effect of overburden pressure
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26
Q

is water or oil easier to inject into the rock

A

water, p1 is less than p2

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27
Q

what quantities are measured during the Welge method of measuring kr

A
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28
Q

what’s the difference between curves 1 and 2

A
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29
Q

what are the equations for relative permeability of each phase

A
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30
Q

limestone / carbonates are ____ wet

A

oil wet

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31
Q

what is the purcell equation

A
32
Q

what does the graph output of the Welge method of kr measurement look like

A
33
Q

curvature of the interface is a funciton of ___________

A
34
Q

what is the equation for contact angle

A
35
Q

describe these charts

A
36
Q

what are the 4 ways to measure kr

A
37
Q

describe these two charts

A
38
Q

what are the advantages and disadvantages of using the Welge methdo to measure kr

A
39
Q

what is threshold pressure

A
40
Q

krg is dependent only on the total saturation of ________and independent of _________

A
41
Q

•The degree of wetting is a function of_______ between fluids and fluid-solid.

A
42
Q

describe this graph

A
43
Q

describe lab measurement of kr using steady state method

A
44
Q

describe this chart

A
45
Q

The interfacial tension between water and oil is _____than that between water and gas.

A
46
Q

what is effective permeability

A
47
Q

_____ is least likely to wet the surface of rock

A
48
Q

imbibition represents _________

A

production

49
Q

what is the imbibition curve

A
50
Q

describe the Weldge method to measure kr

A
51
Q

how is the relative permeability of oil determined mathematically using the Welge method

A
52
Q

effective permability is a function of what?

A
53
Q

describe this chart

A
54
Q

what is the equation of wettability number

A
55
Q

what is point 2 on this curve

A
56
Q

what is point A in the system

A
57
Q

The extended ________ caused by oil occupying smaller pores accounts for the change in relative permeability to oil at constant oil saturations and varying water saturations.

A
58
Q

The oil occupies portions of the rock ______ to the water

A
59
Q

describe these two graphs

A

the graph on the right takes an increase in capilarry pressure for the wetting phase to fill the pores

60
Q

The attainment of 100 %, krnw at saturations of less than 100% indicates ….

A
61
Q

what is point 1 on this curve

A
62
Q

permeability data ______ when overburden pressure is applied

A

increases

63
Q

sandstones are _____ wet

A

water wet

64
Q

why use mercurity injection capillary pressure measurement (MICP)

A

to create a pore size distribution plot

65
Q

which types of formation would we prefer?

A

Left, because the rocks have good poor networks and are well sorted

66
Q

threshold pressure is used to measure ______ in the reservoir

A
67
Q

Above equilibrium saturation, the nonwetting fluid occupies….

A
68
Q

what is the equation for relative permeability

A
69
Q

what are the two ways to express wettability

A
70
Q

what is point 4 on this curve

A
71
Q

The imbibition technique causes the nonwetting phase to lose its ______ at higher values of saturation than drainage

A
72
Q

how is the cumulative gas injected as a function of time in pore volume measured during the Welge meathod of measuring kr

A
73
Q

how is average gas saturation measured during the Welge method of measuring kr

A
74
Q

how is kr determined in the field

A
75
Q

Contact angle is a function of ______ of the fluid and solid

A
76
Q

rapid decline in krw indicates what

A
77
Q

draw the tertiary phase diagrams for all three relative permeabilities

A

Reservoir Fluid Properties (3 decks)

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