List of top Petroleum Production Operations Questions

The effect of pressure on various properties of black oil is shown in the figure. The bubble point pressure is \(P_b\). 

Which of the following option(s) is/are CORRECT?

An electrical submersible pump is to be installed to lift oil of \(30^\circ API\) in a 10000 ft deep well. The oil formation volume factor (\(B_o\)) is \(1.25 \, rb/stb\). The desired flow rate is \(8000 \, stb/day\). Minimum suction pressure of the chosen pump is \(200 \, psi\). Inflow performance relationship shows a flowing bottomhole pressure of \(2820 \, psi\) at the desired flow rate. Assuming casing pressure and weight of the gas in the annulus to be negligible, the minimum pump setting depth is \(\underline{\hspace{1cm}} \, ft\) (rounded off to one decimal place).

A production tubing string of length \(1500 \, m\) is tightly held by packers. Production of hot gases increases tubing temperature by \(20^\circ C\). The tubing's Young's modulus is \(3000 \, N/m^2\), and thermal expansion coefficient is \(5 \times 10^{-6} /^\circ C\). The increase in stress due to temperature rise is ______, \( \N/m^2 \) (rounded off to two decimal places).

A Newtonian fluid flows through a smooth horizontal pipe of diameter \(1 \, \text{m}\), length \(1 \, \text{km}\), flow rate \(3.14 \, \text{m}^3/\text{s}\). Viscosity \(\mu = 0.02 \, \mathrm{Pa\cdot s}\), density \(\rho = 800 \, \mathrm{kg/m^3}\). The Darcy friction factor for turbulent flow is: \[ f = \frac{0.316}{Re^{0.25}} \] Find pressure drop due to friction (kPa).

Natural gas is produced at a flow rate of 2 MMscf/day at the wellhead having temperature and pressure of \(560^\circ R\) and 200 psi, respectively. The apparent molecular weight and compressibility factor (\(z\)) of the gas are estimated to be 20 g/g-mole and 0.8, respectively, at wellhead conditions. The gas formation volume factor (\(B_g\)) at the wellhead condition is ............ \(\times 10^{-2} \, \text{ft}^3/\text{scf}\) (rounded off to one decimal place).
Which of the following statement(s) is/are CORRECT about the chemicals used for the processing of sour crude oil and natural gas?
Match the entries in GROUP I with the entries in GROUP II. \begin{tabular}{|c|c|} \hline GROUP I & GROUP II
\hline (P) Liquid hold-up & (I) Water removal
(Q) Liquid carryover & (II) Free gas escaping with liquid phase
(R) Gas blowby & (III) Free liquid escaping with gas phase
(S) Gas dehydration & (IV) Fraction of pipe volume occupied by liquid
\hline \end{tabular}
The primary objective of the electrostatic grid in electrostatic heater-treater used in crude oil processing is to:
The maximum Polished Rod Load (PRL) in the operation of the sucker rod pump is observed near the:
A Newtonian fluid is transported through a smooth horizontal pipe of diameter 1 m at a flow rate of 3.14 m³/s. The length of the pipe is 1 km. The viscosity of the oil is 0.02 Pa.s and its density is 800 kg/m³. Consider the Darcy friction factor (\( f \)) for turbulent flow in a smooth pipe is given as
\[ f = \frac{0.316}{{Re}^{0.25}} \] where \( {Re} \) is the Reynolds number.
Assuming fully-developed flow in the pipe, the pressure drop due to the frictional effect is .......... kPa (rounded off to two decimal places).

The effect of pressure on various properties of black oil is shown in the figure. The bubble point pressure is \( P_b \). 
 


Which of the following option(s) is/are CORRECT? 
 

A stationary tank is cylindrical in shape with two hemispherical ends and is horizontal, as shown in the figure. \( R \) is the radius of the cylinder as well as of the hemispherical ends. The tank is half filled with an oil of density \( \rho \) and the rest of the space in the tank is occupied by air. The air pressure, inside the tank as well as outside it, is atmospheric. The acceleration due to gravity (\( g \)) acts vertically downward. 
The net horizontal force applied by the oil on the right hemispherical end (shown by the bold outline in the figure) is: 

Match the entries in GROUP I with the entries in GROUP II. 

Which ONE of the following options is CORRECT?

Four curves designated as I, II, III, and IV are shown in the figure. \( q_f \) is the bottomhole oil flow rate, \( q_s \) is the surface oil flow rate, and \( B_o \) is the oil formation volume factor. Which ONE of the following curves depicts the minimum wellbore storage effect? 

Four curves designated as I, II, III, and IV are shown in the figure. \( P_b \) is the bubble point pressure of a crude oil at the given temperature. Which ONE of the following options correctly depicts the solubility of asphaltene (\( q_a \)) in the crude oil with pressure (\( P \)) at a given temperature? 

The laboratory analysis data obtained from the core is as follows:
Weight of clean dry core in air = 30 g
Weight of core completely saturated with oil = 32 g
Weight of saturated core completely immersed in oil = 24 g
If the density of oil used for saturation of core during the experiment is 0.88 g/cc, then the effective porosity of the core is .......... % (rounded off to two decimal places).
An electrical submersible pump is to be installed to lift oil of 30° API in a 10000 ft deep well. The oil formation volume factor (\( B_o \)) is 1.25 rb/stb. The desired flow rate is 8000 stb/day. Minimum suction pressure of the chosen pump is 200 psi. Inflow performance relationship shows a flowing bottomhole pressure of 2820 psi at the desired flow rate.
Assuming casing pressure and weight of the gas in the annulus to be negligible, the minimum pump setting depth is .......... ft (rounded off to one decimal place).
Which of the following statement(s) is/are CORRECT about the chemicals used for the processing of sour crude oil and natural gas?
Which of the following statement(s) is/are CORRECT about polymer flooding?
Crude oil denser than pure water has the API gravity:
The primary objective of the electrostatic grid in electrostatic heater-treater used in crude oil processing is to
An underwater riser with an outer diameter of 250 mm and wall thickness of 20 mm is subjected to tension and pressure. The effective tension is $1200$ kN wherein the internal and external pressures of the riser are $25$ MPa and $6$ MPa, respectively. The true wall tension in the riser is $\times 10^{6}$ N (rounded to two decimal places).
A four–column semi–submersible floater is located offshore. The diameter of each column is $5~\text{m}$. Consider the total displaced weight of seawater of the semi–submersible as $4000~\text{tonnes}$. Assume added mass contribution as $50\%$ of the semi–submersible weight, and seawater density as $1025~\text{kg/m}^3$. (Acceleration due to gravity $=9.81~\text{m/s}^2$.) The natural period of oscillation of the floater in vertical mode is __________ seconds (rounded to one decimal place).
An empty steel pipeline with massless endcaps has an outer diameter, $D$, and thickness, $t$. The density of steel is $7850\ \mathrm{kg/m^3}$. The critical $D/t$ ratio at which the pipeline starts floating in seawater of density $1025\ \mathrm{kg/m^3}$ is _________ (rounded to two decimal places).

Figure shows an inextensible catenary mooring cable in still water. The submerged weight (per meter length), and the anchor radius are 100 kg/m and 50 m, respectively. If horizontal tension ($T_h$) in the catenary is 1600 kg, the catenary length (AB) is ............. m (rounded to two decimal places).