List of top Petroleum Production Operations Questions on Multiphase Flow

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).

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 maximum Polished Rod Load (PRL) in the operation of the sucker rod pump is observed near the:

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

Which ONE of the following options is CORRECT?

Match the suitable artificial lift methods (GROUP I) to meet the requirements (GROUP II) given in the table.

A tubing with an inner diameter of 2.259 inch delivers oil from a well at the rate of 1000 bbl/day. The API gravity and viscosity of the oil are 40° and 1.2 cP, respectively. The tubing makes an angle of 15° with the vertical. Assuming a fanning friction factor of 0.006, the pressure-drop over a length of 1000 ft tubing is \(\underline{\hspace{2cm}}\) psi (round off to nearest integer).

If the specific heat ratio of natural gas is 1.28, the critical pressure ratio (ratio of outlet pressure to upstream pressure) through a choke is \(\underline{\hspace{2cm}}\) (round off to two decimal places).