Electrical Resistivity of Rock
Resistivity is a physical property of the rock which is of interest to the petroleum
engineer since it can be related to the porosity of the rock and to the water
saturation present in the pore space.
Electrical resistivity

Exam 2
Reservoir Rock Properties, Fall 2009
12:10-1:20 pm, November 3 (Tuesday)
Type A
Name (Last name, First name) _ , _
Exam Location (either PTH 1109 or PTH 2427) _
Academic misconduct and/or dishonesty will not be tolerated. If occurs, it will be
imme

Exam 1
Reservoir Rock Properties, Fall 2009
12:10-1:20 pm, September 29 (Tuesday)
Type A
Name (Last name, First name) _ , _ (+1)
Exam Location (either HRC E130 or PTH 2427) _ (+1)
Academic misconduct and/or dishonesty will not be tolerated. If occurs, it

I.
Common Oil Field Units and Measurements
a. Linear and Distance Measurements
i. 1 inch = 2.54 cm
ii. 1 feet = 30.48 cm
iii. 1 feet = 12 inches
iv. 1 yard = 3 feet
v. 1 mile = 5280 feet
b. Area
i. 1 acre = 1 furlong (660 ft) * 1 chain (66 ft) = 43560 ft2

Projecting P x A force on sphere
To find the x component of force due to pressure in a sphere, we look at a circle in the first
quadrant:
F = P x A = P (2 y dS)
dS
F cos()
y
r
x
Arc length on the circle is
dS = r d
By rotating about the x axis, half a sph

Homework 3: Physics of uids
I. By denition. liquid comptessibility can be determined using the following formula:
1 0p
c=-
pap
Show that for slightly compressible uids, the above equation becomes:
9 = P0 +C(P'Po)
lnwhichpoandpomdietefmdmsityuidm.
2. Drawa

Homework 5: Capillary pressure
I. Comidet following sandstone layers with the given height of water-oil mition zone.
what is your prediction of the permeability of the byes.
2. Capillty pressure is measured as 2l700 N/m2 for Sw=0.8 using air-water in th

Homework # l: UNITS & DIMENSIONS
l. According to the following equation. what are the dimmiom ofviscosity?
=£_A_(P1-P2)
u L
2. Considerasystemwith8molesol'OZatthetempenhneofSlORmdavohnneof6
liters. Usingtheidealgaslaw.detetminetheptessmeofthesystemin(a)la

Homework 4: Surface tension and capillary pressure
I. The diagram shown below represents the capillary-rise experiment.
Given the parameters. determine h:
dyne a 9
=72 ,=13°. =. ,=,=.
a m 9 5r. con-mp. I p. 0001cc
.4:
.Jc_
m?
h:
2. A cylindrical meta

Homework 6
1. Calculate the rate of flow into a well from a reservoir with the following
characteristics: -
Permeability- 100 md q : .00 . (EL , (a { kc - wk) 1
Thickness - 30 it I , q
Pressure at the well - 100 psi 5 I l ( 4- /¢w)
Effective radius of t

Dimensional Systems and Their Use
An inherent source of error and confusion for the engineer is the use of dimensional unit
systems, particularly inconsistent ones. The engineer must use both metric and English units
because of the differences between sci

Klinkenberg Effect gas Slippage
The true absolute permeability of porous rock is an intrinsic property of the rock,
reflecting its internal structure. The permeability of a rock is a constant value, unchanged by
different types of fluids at laminar flow r

Answers to homework on flow potential
1)
= + , assume Z= 0 at point B and Z is positive upward
= 500() + 1 (
) 980.7 ( 2 ) 200() 30.48 1.45 105
= . () ()
= +
= 0 = 800() + 0
= ()
() = = ()
Flow direction is always from high potential to low potent

Acoustic Rock Properties
The velocity of sound in reservoir rocks is a useful property that
can provide information on porosity, fluid content and elastic constants.
Velocity is measured by the time it takes a sound wave to travel from a
source (typically

Oil Window Between 7,500 and
12,000 ft. deep at around 150 F; the
point where conditions are right for
organic matter to decompose and form
oil.
Three types of hydrocarbon traps are:
Anticlines, Salt Dome Traps, Fault
Traps, Unconformities, and Reefs
Visc

Reservoir Rock
Properties
PETE 2031, Spring 2013
,
q
2kh ( pe pw )
ln( re / rw )
OOIP = cfw_[7758 (1-Sw) h ] x acres/Bo
,
D = 214/Pc (air-Hg)
Reservoir Rock Properties (PETE 2031) Spring 2013
Course Description
Course Objective
Develop understanding of p

Homework 8: Relative Permeability
1. For a 2 cm x 1 cm core sample, calculate the permeability to air (in D) given the following
information. The inlet pressure (P1) is 5 atm and the outlet pressure (P2) is 2 atm. The
length of the sample 4 cm and the vis

Homework 10: Compressiblllty (Week of April 8. 13)
, j 1. Define the following terms both verbally and mathematically and be able to
7 ' I; distinguish the differences between them
a. Compressibility
f -7 b. Averagecompressibility
. . - c Formation compr

Final Exam
Reservoir Rock Properties, Fall 2009
12:30-2:30 pm, December 10 (Thursday)
Type A
Name (Last name, First name) _ , _
Academic misconduct and/or dishonesty will not be tolerated. If occurs, it will be
immediately reported to the department chair

RADIOACTIVE PROPERTIES OF ROCKS
Z
E
A
where:
E is the symbol for the specific element
Z is the number of protons contained in the nucleus
A is the total number of neutrons + protons in the nucleus
4
He
is Helium, with 2 protons, 2 neutrons,
2
and 2 electr

Rock Permeability
- a measure of a rocks ability to transmit fluids
- number, size, shape, and continuity of
the pores
- oil bearing rocks vary from a few millidarcy
to several thousand darcy
- unit of permeability named for Henri DArcy,
a French engineer

Electrical Resistivity of Rock
Resistivity is an intrinsic physical property of the rock
Resistance is the proportionality constant in Ohms Law
V I or V = R I
The shape of the material of a given resistivity determines
its resistance
For example, Copper i

Exam 3
Reservoir Rock Properties, Fall 2012
Nov. 13 (Tuesday) Type B
DO NOT TEAR OFF THIS COVER PAGE!
Name (Last name, First name) _, _
Exam Location (circle)
Tureaud Hall
or
PFT Hall
(1 point)
Academic misconduct and/or dishonesty will not be tolerated.