+200 Petroleum Company Interview Questions part.1

a very big collection of more than 200 questions asked in petroleum companies exams and interviews, enjoy!

Define
—————
Condenser – Sp.Gr – Dynamic viscosity – Reid vapor pressure – True pressure – Diesel index – Heat exchanger – Ideal fluid – Fire point – Flash point – Pour point

True or false
——————
– Gear pump is used in gasoline ( )
– The most losses in energy is in the stack of the Furnace ( )
– Octane of iso p < n.p ( )
–  – In h.ex cp=cal/(Lb.f.sec.) ( )
Cetane number of normal cetane >80 ( )

Choose
———-
1- To increase the reflux ratio what about the heat removed from the cooler (decrease – increase or unaffected)
2- Characterization factor =12.5 (parrafine base- intermediate – naphthenic)
3- True pressure is …………. reid vapor pressure( higher (5-10%) than –lower (10-20%) than – equal)
4- Excess air in furnace in case of N.g is ( 20-15-25 %)

Complete
—————
1- Q=U * …. * ∆Tlm
2- API =141.5/(….) -131.5
3- 130 oC =…1.8*130 -32 =….. oF
4- Furnace efficiency =Q duty / Q fired
5- Pump efficiency = work out / work in
6- Sp.Gr =P*Mwt/ ZRT

Define these equipment
——————————-
1- heat exchanger
2- expansion valve
3- control valve
—————————-
Draw the Figure express each of:
1- tower
2- Condenser
3- Drain
4- reboiler
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Answer these questions:

1-Dew point is:
2-Bubble point is:
3-Define octane number?
4-How to increase O.N?
5-Why salt is removed from crude?
6-Why we make vacuum distillation to fuel oil?
7-Why we separate produced water from crude in the field?
8-What is the greater P1 or P2? Considering that d1 is greater than d2.
9.What are the types of flow?
10. Reasons effecting putting liquid in shell or tube?
11. Q=U*A*∆T = M*CP*∆ T
What is the different between the two ∆T?
12-What are the units of U?
13. Convert from british to metric if 1 BTU=5Kcal?
————————————————-

A- Briefly explain two criteria to distinguish between shallow marine and deep marine environments.

B- How can you explain presence of dry reservoir although there is Source rock, Reservoir rock and Trap?

C- Write briefly on the listric faults and structure associated with it.

D- Write briefly on the types of kerogen and the composition of generated HC from each.

GEOPHYSICS EXAM
—————————-
1- What is that survey geometry look like? (Shot , Receiver )
2- Plot on the right hand side the trace corresponding to the recording locations in the figure.
Let Sandstone Layer be 24m thick with velocity of 3000m/sec. A down going wave strikes the top of the sandstone and is reflected by 0.1 reflection coefficient. The part of the transmitted wavelet into the sandstone is reflected by -0.1 reflection coefficient at the base of the layer. Neglect the amplitude loss in transmission through the sand layer.

-What is the composition wavelet if the input wavelet @ 4 ms sample rate is (8, 7,-7.-5, 0, 4, 2)?
-Explain Why the sandstone top and base are “Resolved”?

Top

24 m

Base

Given the trace amplitudes (2, -1, 5, -4, 3, -2, and 6).

a) Calculate the average absolute amplitude for the trace?
b) Calculate the root mean square amplitude for the trace?
c) What is the instantaneous frequency if this trace is sampled every 4 ms sample rate?

1- Permeability and porosity. (Define)
2- Reverse and Thrust Fault (Differences)
3-Dolomite, Anhydrite, Limestone (How to differentiate)
4-What is the major structure which separate between Tertiary and Pre-tertiary in NileDelta.
5-What is Nile Delta stratigraphic Colum?
6-What is the difference between Porosity and Effective Porosity?
7-What do you know about miscellaneous reservoirs and what is the most famous example in Gulf of Suez?
8-What do you know about SP& GR tools?
9- Talk about yourself and what did you do from the morning after the exam till now?

————————————————-

-Draw both of Western desert and Gulf of Suez stratigraphic Colum
– Write the Chemical composition of ( (Salts-dolomite- anhydrite-Gypsum
– Draw with mentioning type of the force (Thrust fault- reverse Fault- Grabben- Horest).
– Draw a simplified map for Egypt with illustrating provinces.

– Define :-

(Unconformity- Sedimentary rock- Porosity)

===============================================

Choose the right answer:

1. Which of the following types of mass storage provides the fastest access:

• Magnetic tape.
• CD-ROM.
• Flash memory.
• Hard drive.

2. WWW means:

• World windows web.
• World wide web.
• Windows web world.
• Wide windows web.

3. For any PC, the processor speed mostly characterized by

• Cash memory.
• RAM.
• Data processing speed.
• Hard disk speed.

4. An ion:

• Is electrically neutral.
• Has positive electric charge.
• Has negative electric charge.
• Might have either positive or negative charge.

5. If a material has low resistance:

• It is a good conductor.
• It is a poor conductor.
• The current flow mainly in the form of holes.
• The current flow only in one direction.

6. A current of 25 A is most likely drawn by:

• A flash light bulb.
• A typical household.
• A power plant.
• A clock radio.

7. a low voltage such as 12 v.

• Is never dangerous.
• Is always dangerous.
• Is dangerous if it is ac, but not if it is dc.
• Can be dangerous under certain conditions.

8. If X = 1 and Y = 1, then (X or YZ) is:

• Always 0.
• 0 if Z = 0and 1 if Z = 1.
• 1 if Z = 0 and 0 if Z = 1.
• Always 1.

9. Image resolution can be specified in terms of:

• Megahertz.
• Color intensity.
• Wavelength.
• Dot pitch.

10. Bits per second (bps) is a unit of:

• Computer memory.
• Mass storage.
• Image resolution.
• Data speed.

11. Give the DOS command on a PC to copy the whole content from drive A to an existing directory called Atlas on a hard drive C:

• Copy a, c/atlas
• dcopy a:, c\atlas
• Copy a *.* c\atlas
• Copy a: *.* c:\ atlas
• dcopy a: *.* c:\ atlas
• copy a *.* c\:atlas

12. In a series connected string of holiday ornament bulbs, if one bulb gets shorted out, which of these is most likely?

• All the other bulbs will go out.
• The current in the string will go up.
• The current in the string will go down.
• The current in the string will stay the same.

13. Which of the following can vary with ac, but not with dc?

• Power.
• Voltage.
• Frequency.
• Magnitude.

14. You should remember that:
P = IV
V = IR (Ohms Law)
As you may find some problems about them in the exam

Geology section:
———————–

Answer the following questions

1. Although shale is not regarded as reservoir because its permeability is almost nothing, hydrocarbons might move from the source rock shale by one or more of the following causes, select:

• Through shale fissility.
• Through micro-permeability caused by sand size fraction content.
• By high pore pressure associating hydrocarbon maturity and increasing distance between grain boundaries.

2. The Gulf of Suez rift basin was formed due to:

• Collision of Eurasia against Africa.
• Subduction of Africa against Arabia.
• Extension between Arabia and Africa.

3. The Gulf of Suez was formed through:

• Early Paleozoic.
• Late Triassic.
• Early Miocene.

4. The Syrian Arc Structures are :
• Tilted fault blocks.
• Shallow Rift Basins.
• Asymmetrical folds.

5. Clastic Rocks:

• Are formed due to reaction between Calcium and Sulphate.
• Are formed from weathered particles of Sand, Clay and Silt.
• Are formed from chemical precipitation of Calcium Carbonate.

6. The most common reservoirs are:

• Sandstone and Carbonate rocks.
• Shale and Sandstone rocks.
• Anhydrite and Dolomite rocks.

7. Shale is:

• Compaction processing of clay minerals.
• Made of Calcium Carbonate and Sodium Sulphate.
• Originated in deep marine water.

8. The faults can be divided into:

• Dextral and sinistral faults.
• Normal, reverse, thrust faults.
• Regional and tectonic faults.

9. The most common tools used to determine hydrocarbon are:

• Sonic, gamma rays.
• Resistivity and Neutron density.
• Dipmeter, borehole geometry tool.

10. Anhydrite plays an important role as:

• Reservoir potential rocks.
• Good source rocks.
• As ultimate scaling rocks.

11. The oil can be trapped in the:

• Structure trap only.
• Structure and stratigraphic traps.
• stratigraphic traps only.

12. Calculate the time for a ray to travel vertically from point “A” to point “B”:

D1 = 2000 ft.
D2 = 4000 ft.
D3 = 6000 ft.

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Math and Geometry (Calculators are not allowed)
—————————————

1. Add 788632 + 39678 + 56831 + 21. (Don’t use calculator – your sheet has to show all workings).

2. Convert the following fractions into decimal: (Don’t use calculator – your sheet has to show all workings).
16/80 1/8 5/16 6/32

3. Multiply 983724 by 79. (Don’t use calculator – your sheet has to show all workings).

4. Find the area of a circle 2 inches in diameter. (Don’t use calculator – your sheet has to show all workings).

5. Find the flat surface area in square inches of this rectangle 8 3/4 inches x 6 inches.

6. What’s the effective area (shaded) of a piece of pipe 3 inch OD and 2 inch ID?

7. If you have a piece of pipe with a 9.68 inches OD x 8.837 inches ID and 320 ft long weighing 40 lbs per foot, what would the weight be in air?

8. Find the volume of this cylinder in cubic feet, in barrels and in gallons. d=16 ft and height=20 ft

9. The formula to convert degrees centigrade (o C) to degrees Fahrenheit (o F) is: o F = ( o C * 1.+32. What is 60 o C in o F?

• 1690
• 2.8125
• 59077
• 140

10. Put each of these words into its correct place:
Diameter – radius – circumference >> Draw

11. How many sides are there in a rectangle?

• 6
• 4
• 2
• 8

12. 67% of 100 is equal to what whole number?

• 34
• 67
• 3/4
• 2/3

13. Find the volume of the below box in cubic feet and in U.S. barrels.
1 cubic feet = 0.1781 U.S. barrels

14. If 100 kilograms (Kg) is equal to 220 pounds, what’s 1100 pounds equal to in kilograms?

• 2200 Kg.
• 242000 Kg.
• 11 Kg.
• 500 Kg.

Basic Electronics:
————————

1. A meter used to measure voltage in an electrical circuit is called:

• Ammeter.
• Ohmmeter.
• Odometer.
• Voltmeter.

2. A device used to store electrical charge:

• Diode.
• Capacitor.
• Resistor.
• Transistor.

3. Formula of Ohm’s Law:
…………………………………………..

4. When electrical current is flowing, the circuit being tested is said to be a “closed circuit”. If electrical current is unable to flow, the circuit is said to be an “open circuit”. With a meter which measures resistivity, which value of resistivity should you expect in measure in an open circuit?

• 0.2 Ω.
• 2000 Ω.
• Infinity Ω.
• None of the above.

Basic Geology:
——————–

1. Which of the following is not a stratigraphic oil trap?

• Unconformity.
• Reef.
• Anticline.
• Pinchout.

2. Index fossils are most useful when they cover a large geological age while exist in a limited geographical area so that they identify (or date) the rock formation in which they are found.

• True.
• False.

3. The SaSO4 is known in nature as:

• Limestone
• Anhydrite.
• Gypsum.
• None of the above.

4. Fissility is a rock sample description specific for:

• Limestone.
• Shale.
• Sandstone.
• Salt.

5. Which of the following is not a hydrocarbon:

• Methane.
• Pentane.
• Acetylene.
• None of the above.
• All of the above.

6. The definition: “the pore spaces – connected or disconnected – resulting through alteration of a rock, commonly by processes such as dolimitization, dissolution or fracturing” belongs to:

• Primary porosity.
• Permeability.
• Secondary porosity.
• Effective porosity.

7. According to moh’s scale of rock hardness, which of the following minerals is the softest:

• Orthoclase.
• Gypsum.
• Quartz.
• Fluorite.

8. Which of the following describes a rock with clay content:

• Calcareous.
• Fossiliferous.
• Arenaceous.
• Argillaceous.

9. Which of the following is not a fault type:

• Strike- slip.
• Oblique – slip.
• Anti- dip.
• Dip- slip.

10. Give an example of a rock with high porosity and high permeability.
………………………………………….

11. Give an example of a rock with high porosity and low permeability.
………………………………………….

12. Give an example of a rock with low porosity and low permeability.
………………………………………….

13. Which of the following is not an evaporite rock:

• Gypsum.
• Evaporite.
• Muscovite.
• Salt.

14. Arrange the following ages chronologically (mark them 1 to 5 where 1 is the oldest):

• Tertiary.
• Cambrian.
• Triassic.
• Jurassic.
• Quaternary.

=============================================

1. Write the geologic column.

2. What is the difference between:

• Limestone, dolomite and anhydrite.
• Shale and sandstone.

3. Nubia S. St. or Nubian S. St., why?

• Continental or marine?
• What is the age?
• Does it contain fossils?

4. What are types of faults?

5. What are types of traps?

6. Write the geological column and formations for the Gulf of Suez.
• Write the main traps in this section.

7. Write the geological column and formations for the Western desert.

8. Indicate whether the following increase (I), decrease (D) or remain the same (S) with increasing depth in normally compacted shales:

• Porosity.
• Density.
• Seismic velocity.
• Sonic transit time.
• Electrical resistivity.
• Matrix stress gradient.
• Compressive strength.

9. Porosity of shales for a geologic environment which is characterized by continuous, uninterrupted deposition and normal pore pressure:

A. Increases linearly with increasing depth.
B. Decreases linearly with increasing depth.
C. Decreases basically exponentially with increasing depth.
D. Exhibits an inversely proportional behavior to density.
E. A and D above.
F. C and D above.

10. The diagenesis of montmorillonite to illite and mixed-layer clays:

A. Requires only particular conditions of temperature.
B. Occurs only at depths normally exceeding 5000 ft.
C. Occurs only after most free pore water has been expelled.
D. Requires particular conditions of temperature and (somewhat) pressure and the availability of potassium ions.
E. May occur at relatively shallow depths.
F. B, C and D above.
G. D and E above.

11. During compaction, particularly shales, free pore water is expelled:

A. Towards the depositional surface.
B. In any direction including downwards.
C. In a linear fasion.
D. In several stages.
E. A and D.
F. B and C.