Petrobowl Questions
What chemical found in TNT is also found in oil, particularly Borneo crude? - ✔✔ correct answer Toloul
What is the term for the vented or drained off fluids from a pressured well? - ✔✔ correct answer Bleed
Off
Name Five types of Packers used in the oil industry? - ✔✔ correct answer Compression set packer,
drillable packer, hookwall packer, inflatable packer, hydraulic packer
This volume of gas has been separated from produced water. - ✔✔ correct answer Blue gas
What is a raised metal lip that is around a perforation? - ✔✔ correct answer Burr
what is the area of the rock adjacent to the perforation tunnel where permeability may be 50% less than
initial, undamaged permeability? - ✔✔ correct answer Crush Zone
This term describes the difference between average reservoir pressure and the flowing bottomhole
pressure. - ✔✔ correct answer Drawdown
This type of drawdown is the pressure differential from the formation near the wellbore to the wellbore.
- ✔✔ correct answer Completion Drawdown
This is a rubber or plastic material used as a seal. - ✔✔ correct answer Elastomer
In the USA, this type of well is defined as producing 10 BOE/d or less. - ✔✔ correct answer Stripper well
Describe what a z factor is also give the equation for it. - ✔✔ correct answer The "z" factor is the ratio of
the volume actually occupied by a gas at a given pressure and temperature to the volume the gas would
occupy at the same pressure and temperature if it behaved like an ideal gas. Z= VACTUAL /VIDEAL
What is the equation for gas specific gravity? - ✔✔ correct answer Yg = Y/Yair
,Petrobowl Questions
What do the variables represent in the gas specific gravity equation? - ✔✔ correct answer Yg is the
specific gravity of the gas, ?g is the density of the gas, and ?air is the density of dry air.
What would the pressure be in a black oil reservoir at discovery? - ✔✔ correct answer Either above the
bubble point or equal to the bubble point pressure
What are the two types of chemical bonds? - ✔✔ correct answer Covalent and ionic bonds
What is a vessel used to treat or separate water-oil emulsions? - ✔✔ correct answer Treater
In offshore operations, what does FPSO stand for? - ✔✔ correct answer Floating Production, Storage,
and Offloading Vessel
What is vessel used to separate gas oil and water after the mixture is produced from the well? - ✔✔
correct answer Separator
What is the unused world oil production capacity called? - ✔✔ correct answer Spare Capacity
What type of well typically produces a few barrels of oil per day and accounted for 15 percent of total
U.S. production in 1986? - ✔✔ correct answer Stripper wells
What is the average world's water cut associated with oil production? - ✔✔ correct answer 25%
Who is considered the world leader in deep-offshore production? - ✔✔ correct answer Brazil's
Petrobras.
Wildcatter's used to taste and classify oils as sweet, medium sour, and sour based on what property of
oil? - ✔✔ correct answer Sulfur Content.
What term is used to define a higher than expected production from existing oilfields possible due to
improved management, adoption of more sophisticated and costly technologies or previous
miscalculation? - ✔✔ correct answer Production Creeping
,Petrobowl Questions
What are the two possible ways single phase flow can be characterized? - ✔✔ correct answer Laminar or
Turbulent
The velocity profile is parabolic for what type of flow? - ✔✔ correct answer Laminar
Assuming uniform pipe diamters, what will be the pressure drop due to kinetic enery for an
incompressible fluid. - ✔✔ correct answer Zero
When calculating relative pipe roughness, Є=k/d, what is k? - ✔✔ correct answer Length of the
protrusions on the pipe wall.
In two phase flow what is hold up? - ✔✔ correct answer When the lighter phase flows faster than the
denser phase.
What is bubble flow? - ✔✔ correct answer Dispersed bubbles of gas in a continous liquid phase.
What is slug flow? - ✔✔ correct answer At higher gas rates, the bubbles coalesce into larger bubbles,
called Taylor bubbles, that eventually fill the entire pipe cross section. Between the large gas bubbles are
slugs of liquid that contain smaller bubbles of gas entrained in the liquid.
What is churn flow? - ✔✔ correct answer With a further increase in gas rate, the larger gas bubbles
become unstable and collapse, resulting in churn flow, a highly turbulent flow pattern with both phases
dipsersed. Churn flow is characterized by oscillatory, up and down motions of the liquid.
What is annular flow? - ✔✔ correct answer At higher gas rates, gas becomes the continous phase, with
liquid flowing in an annulus coating the surface of the pipe and with liquid droplets entrained in the gas
phase.
Which two phase pressure gradient correlation can be used for any pipe inclination and flow direction? -
✔✔ correct answer Beggs and Brill
, Petrobowl Questions
Why for two phase flow would an increase in the imposed well head pressur result in a proportionaltely
larger increase in the corresponding bottom hole pressure? - ✔✔ correct answer Because gas would be
re-dissolved, increasing the density of the fluid in the wellbore.
What is the concept of a gas lift? - ✔✔ correct answer Increase gas liquid ratio resulting in a reduction to
bottomhole pressure
There exists a limting gas liquid ratio, where the decrease in hydrostatic pressure will be offset by what? -
✔✔ correct answer Increase in frictional pressure drop
The instersection of the IPR curve and VLP curve gives what result? - ✔✔ correct answer Well
deliverability
The integration fo flow rate versus time results in what? - ✔✔ correct answer Cummulative Production
The fluid recover from an undersaturated oil reservoir depends entirely on what? - ✔✔ correct answer
The fluid expansion as a result of underground withdrawal and associated pressure reduction.
In Havlena and Odehs application of the material balance what is m? - ✔✔ correct answer m= vol of gas
cap/vol of oil
Graphing F vs Eo (underground withdrawals vs Oil Expansion) would result in a slope of what, for
saturated reservoirs and with no gas cap. - ✔✔ correct answer Slope of N, original oil in place
Which type of reservoir drive system is happening when a reservoir contains no gas cap but rapidly
passes below the bubble point pressure after production commences. - ✔✔ correct answer Solution gas
drive
With two phase flow, why does the flow regime not affect the pressure drop in horizontal flow as it does
in vertical flow? - ✔✔ correct answer No potential energy contribution to the pressure drop in horizontal
flow
What chemical found in TNT is also found in oil, particularly Borneo crude? - ✔✔ correct answer Toloul
What is the term for the vented or drained off fluids from a pressured well? - ✔✔ correct answer Bleed
Off
Name Five types of Packers used in the oil industry? - ✔✔ correct answer Compression set packer,
drillable packer, hookwall packer, inflatable packer, hydraulic packer
This volume of gas has been separated from produced water. - ✔✔ correct answer Blue gas
What is a raised metal lip that is around a perforation? - ✔✔ correct answer Burr
what is the area of the rock adjacent to the perforation tunnel where permeability may be 50% less than
initial, undamaged permeability? - ✔✔ correct answer Crush Zone
This term describes the difference between average reservoir pressure and the flowing bottomhole
pressure. - ✔✔ correct answer Drawdown
This type of drawdown is the pressure differential from the formation near the wellbore to the wellbore.
- ✔✔ correct answer Completion Drawdown
This is a rubber or plastic material used as a seal. - ✔✔ correct answer Elastomer
In the USA, this type of well is defined as producing 10 BOE/d or less. - ✔✔ correct answer Stripper well
Describe what a z factor is also give the equation for it. - ✔✔ correct answer The "z" factor is the ratio of
the volume actually occupied by a gas at a given pressure and temperature to the volume the gas would
occupy at the same pressure and temperature if it behaved like an ideal gas. Z= VACTUAL /VIDEAL
What is the equation for gas specific gravity? - ✔✔ correct answer Yg = Y/Yair
,Petrobowl Questions
What do the variables represent in the gas specific gravity equation? - ✔✔ correct answer Yg is the
specific gravity of the gas, ?g is the density of the gas, and ?air is the density of dry air.
What would the pressure be in a black oil reservoir at discovery? - ✔✔ correct answer Either above the
bubble point or equal to the bubble point pressure
What are the two types of chemical bonds? - ✔✔ correct answer Covalent and ionic bonds
What is a vessel used to treat or separate water-oil emulsions? - ✔✔ correct answer Treater
In offshore operations, what does FPSO stand for? - ✔✔ correct answer Floating Production, Storage,
and Offloading Vessel
What is vessel used to separate gas oil and water after the mixture is produced from the well? - ✔✔
correct answer Separator
What is the unused world oil production capacity called? - ✔✔ correct answer Spare Capacity
What type of well typically produces a few barrels of oil per day and accounted for 15 percent of total
U.S. production in 1986? - ✔✔ correct answer Stripper wells
What is the average world's water cut associated with oil production? - ✔✔ correct answer 25%
Who is considered the world leader in deep-offshore production? - ✔✔ correct answer Brazil's
Petrobras.
Wildcatter's used to taste and classify oils as sweet, medium sour, and sour based on what property of
oil? - ✔✔ correct answer Sulfur Content.
What term is used to define a higher than expected production from existing oilfields possible due to
improved management, adoption of more sophisticated and costly technologies or previous
miscalculation? - ✔✔ correct answer Production Creeping
,Petrobowl Questions
What are the two possible ways single phase flow can be characterized? - ✔✔ correct answer Laminar or
Turbulent
The velocity profile is parabolic for what type of flow? - ✔✔ correct answer Laminar
Assuming uniform pipe diamters, what will be the pressure drop due to kinetic enery for an
incompressible fluid. - ✔✔ correct answer Zero
When calculating relative pipe roughness, Є=k/d, what is k? - ✔✔ correct answer Length of the
protrusions on the pipe wall.
In two phase flow what is hold up? - ✔✔ correct answer When the lighter phase flows faster than the
denser phase.
What is bubble flow? - ✔✔ correct answer Dispersed bubbles of gas in a continous liquid phase.
What is slug flow? - ✔✔ correct answer At higher gas rates, the bubbles coalesce into larger bubbles,
called Taylor bubbles, that eventually fill the entire pipe cross section. Between the large gas bubbles are
slugs of liquid that contain smaller bubbles of gas entrained in the liquid.
What is churn flow? - ✔✔ correct answer With a further increase in gas rate, the larger gas bubbles
become unstable and collapse, resulting in churn flow, a highly turbulent flow pattern with both phases
dipsersed. Churn flow is characterized by oscillatory, up and down motions of the liquid.
What is annular flow? - ✔✔ correct answer At higher gas rates, gas becomes the continous phase, with
liquid flowing in an annulus coating the surface of the pipe and with liquid droplets entrained in the gas
phase.
Which two phase pressure gradient correlation can be used for any pipe inclination and flow direction? -
✔✔ correct answer Beggs and Brill
, Petrobowl Questions
Why for two phase flow would an increase in the imposed well head pressur result in a proportionaltely
larger increase in the corresponding bottom hole pressure? - ✔✔ correct answer Because gas would be
re-dissolved, increasing the density of the fluid in the wellbore.
What is the concept of a gas lift? - ✔✔ correct answer Increase gas liquid ratio resulting in a reduction to
bottomhole pressure
There exists a limting gas liquid ratio, where the decrease in hydrostatic pressure will be offset by what? -
✔✔ correct answer Increase in frictional pressure drop
The instersection of the IPR curve and VLP curve gives what result? - ✔✔ correct answer Well
deliverability
The integration fo flow rate versus time results in what? - ✔✔ correct answer Cummulative Production
The fluid recover from an undersaturated oil reservoir depends entirely on what? - ✔✔ correct answer
The fluid expansion as a result of underground withdrawal and associated pressure reduction.
In Havlena and Odehs application of the material balance what is m? - ✔✔ correct answer m= vol of gas
cap/vol of oil
Graphing F vs Eo (underground withdrawals vs Oil Expansion) would result in a slope of what, for
saturated reservoirs and with no gas cap. - ✔✔ correct answer Slope of N, original oil in place
Which type of reservoir drive system is happening when a reservoir contains no gas cap but rapidly
passes below the bubble point pressure after production commences. - ✔✔ correct answer Solution gas
drive
With two phase flow, why does the flow regime not affect the pressure drop in horizontal flow as it does
in vertical flow? - ✔✔ correct answer No potential energy contribution to the pressure drop in horizontal
flow
