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WorksheetsPETE 3050 Exam 2
Total questions: 34
Worksheet time: 20mins
Consider linear flow at constant mass rate into a reservoir. Mass balance implies that mass inflow rate must be equal to the mass outflow rate.
True
False
Consider linear flow at constant mass rate into n incompressible rock and fluid system. Mass balance implies that mass inflow rate must be equal to the mass outflow rate.
True
False
If the rock and fluid system is compressible, mass inflow rate may be different from mass outflow rate.
True
False
For a compressible rock and fluid system, the mass inflow rate will eventually get equal to the mass outflow rate.
True
False
Equal mass rates into and out of the system imply that the corresponding volumetric rates would be identical.
True
False
𝑚̇ 𝑖𝑛 = 𝑚̇ 𝑜𝑢𝑡 → 𝑞𝑟𝑐,𝑖𝑛 = 𝑞𝑟𝑐,𝑜𝑢𝑡.
True
False
𝑚̇ 𝑖𝑛 = 𝑚̇ 𝑜𝑢𝑡 → ( (𝑘𝐴/𝜇) (𝑑𝑝/𝑑𝑥)) 𝑖𝑛 = ( (𝑘𝐴/𝜇) (𝑑𝑝/𝑑𝑥)) 𝑜𝑢𝑡 .
True
False
𝑚̇ 𝑖𝑛 = 𝑚̇ 𝑜𝑢𝑡 → 𝑞𝑠𝑐,𝑖𝑛 = 𝑞𝑠𝑐,𝑜𝑢𝑡.
True
False
𝑚̇ 𝑖𝑛 = 𝑚̇ 𝑜𝑢𝑡 → ( (𝑘𝐴/𝜇𝐵) (𝑑𝑝/𝑑𝑥)) 𝑖𝑛 = ( (𝑘𝐴/𝜇𝐵) (𝑑𝑝/𝑑𝑥)) 𝑜𝑢𝑡 .
True
False
For incompressible linear flow, the mass rate is identical at any cross section perpendicular to the flow
True
False
For incompressible linear flow, the pressure does not change with distance.
True
False
For incompressible linear flow, the pressure gradient does not change with distance.
True
False
For incompressible radial flow, the pressure gradient does not change with distance.
True
False
The pressure gradient increases toward the well for both incompressible radial and spherical flow.
True
False
Plotting pressure with respect to which of the following provides linear behavior for radial flow?
r
1/r
log(r)
ln(r)
log(r) and ln(r)
Plotting pressure with respect to which of the following provides linear behavior for spherical flow?
r
1/r
log(r)
ln(r)
log(r) and ln(r)
Which of the following statements is incorrect regarding the skin factor?
Skin factor is dimensionless
The skin factor is more impacted by permeability of the damaged zone than its radius.
The skin factor can theoretically take any negative or positive number
Skin factor is negative if reservoir is stimulated.
A stimulated well acts as if its radius is larger than its actual radius.
True
False
The fracture length of a fractured well is 500 ft. Calculate its skin factor. Wellbore radius is 0.5 ft.
(a)
Flow efficiency of a damaged well is less then unity.
True
False
For a well in the center of a closed circular drainage area with typical wellbore radius, a rule of thumb value of 𝑙𝑛 ( 𝑟𝑒 𝑟𝑤 ) ≈ 7 is often used. Calculate the fold of increase in a well productivity, if its skin factor is dropped (using an acid job) from 49 to 7.
(a)
Oil formation volume factor increases with decreasing pressure associated with production.
True
False
Considering fluid compressibility, the oil flow rate is proportional to pressure drop.
True
False
Considering fluid compressibility, the gas flow rate is proportional to pressure drop.
True
False
Considering fluid compressibility, the gas flow rate is proportional to pressure drop if the pressure is sufficiently high.
True
False
Which of the following is relatively constant for gas flow at low pressures (<1500 psi)?
Viscosity
z-factor
Viscosity x z-factor
(Viscosity x z-factor)/pressure
Which of the following is relatively constant for gas flow at high pressures (>4000 psi)?
Viscosity
z-factor
Viscosity x z-factor
(Viscosity x z-factor)/pressure
How many approaches were introduced for steady-state gas flow calculations?
1
2
3
4
Adjusted pressure is independent of reservoir initial conditions.
True
False
For steady-state gas flow, which approach is most accurate at low pressures?
Low pressure approach
High pressure approach
Rigorous approach
Consider a u-tube partially filled with water. Does water flow in any direction?
(a)
Calculate specific gravity of an oil with 50 lb/ft3 density.
(a)
Calculate the bottom-hole pressure (in psi) of a 10,000-ft deep well filled with 50 lb/ft3 density oil.
(a)
Calculate the bottom-hole pressure (in psi) of a 10,000-ft deep well filled with a gas with 5 lb/ft3 average density.
(a)
