List of top Petroleum Engineering Questions

‘Cupola’ offshore storage tank is an example of:
The general equation for the production rate decline can be expressed as \[ \frac{1}{q} \frac{dq}{dt} = -bq^d \] where, b and d are empirical constants, and q is the production rate.
Match the value of \(d\) (Group 1) with the appropriate decline curves (Group 2).
The production optimization is evaluated on the basis of discounted revenue to be generated by the projects. The net present value (NPV) for calculating the discounted revenue is defined by
\[ NPV = NPV_R - \text{cost} \] where, \(NPV_R\) = present value of cash flow discounted at a given rate \(i\).
If \(\Delta R_n\) is the annual incremental revenue after optimization for the \(n^{th}\) year, and \(m\) is the remaining life of the project at the end of \(n^{th}\) year, then which ONE of the following options for \(NPV_R\) is CORRECT?

Surface tension of liquid A in a capillary is being measured in the laboratory using capillary rise (refer the figure given below). The capillary radius \( r \) is 100 \(\mu\)m, the height of liquid column \( h \) is 10 cm and \( \Theta = 38^\circ \). Density of air can be neglected. Assume liquid A to have the same density as water. Surface tension of liquid A at room temperature is \(\underline{\hspace{2cm}}\) dyne/cm (round off to one decimal place). 

A porous medium (shown schematically in the figure) has the following properties. 
\(\text{Length } L = 600 \, \text{m}, \text{ Width } W = 8 \, \text{m}, \text{ Height } h = 0.5 \, \text{m}, \text{ Permeability } k = 100 \, \text{mD}, \text{ Porosity } \phi = 15%.} \)

An incompressible fluid having a viscosity of 2 cP is flowing through a porous medium at the inlet and exit pressures of \(7 \times 10^6 \, \text{Pa and } 6 \times 10^6 \, \text{Pa, respectively.} \) The actual fluid velocity through the porous medium is \(\underline{\hspace{2cm}} \times 10^{-7} \, \text{m/s.}\)

Match the petroleum reservoir forming traps (GROUP I) with their general classifications (GROUP II). 
 

Match the following rock types (GROUP I) with their respective chemical compositions (GROUP II) from the given options. 

Match the Enhanced Oil Recovery (EOR) methods (GROUP I) with the corresponding laboratory tests (GROUP II). 

When CO\(_2\) and liquid water are brought in contact with each other, they may form solid hydrates. The three-phase hydrate boundary is shown in the Pressure-Temperature plot given below. Identify the correct statements. 

Pressure – Temperature phase diagram of CO\(_2\) is shown below. Identify the correct phases from the given options. 
 

In the original Darcy's law as proposed by Henry Darcy, which of the following drives the fluid flow through a fully saturated sand column?
At which ONE of the following scales is Darcy's law for fluid flow through a porous medium applicable?
Among the options given below, what is the typical temperature range for significant oil generation in a source rock associated with conventional crude-oil reservoirs?
Miscible displacement process is one of the EOR techniques. The performance of this process depends on fluid physical properties that affect flow behavior in a reservoir. Two of the important properties are density and viscosity. Consider the use of CO\(_2\) for one such process. The density of CO\(_2\) at the reservoir condition is \(\underline{\hspace{2cm}}\) lb/ft\(^3\) (round off to one decimal place). Relevant data for this calculation are given below.
- Reservoir temperature = 300 ºF (422 K)
- Reservoir pressure = 1470 psig (100 atm)
- Compressibility factor (\(z\)) at the reservoir condition = 0.5
- Values of Universal Gas Constant (\(R\)) in different units are listed below:
- \( R = 8.314 \, \text{m}^3 \, \text{Pa.K}^{-1} \, \text{mol}^{-1} \)
- \( R = 10.731 \, \text{psi.ft}^3 \, \text{lb.mol}^{-1} \, \text{ºR}^{-1} \)
- \( R = 0.082 \, \text{L} \, \text{atm.K}^{-1} \, \text{mol}^{-1} \)
Coal bed methane is methane gas adsorbed in coal seams. To desorb the methane from the coal seam it should be exposed to CO\(_2\) and/or N\(_2\). Which ONE of the following is an appropriate reason to enhance the desorption process?
When two immiscible fluid phases are placed in contact with a solid surface, one phase usually is attracted to solid more strongly than the other phase. The more strongly attracted phase is called the 'wetting phase'. The inter-molecular interaction of the non-wetting phase with the solid is \(\underline{\hspace{2cm}}\)I\(\underline{\hspace{2cm}}\) than its intra-molecular interaction. Due to this, the non-wetting phase tends to occupy the \(\underline{\hspace{2cm}}\)II\(\underline{\hspace{2cm}}\) of the reservoir.
Select the INCORRECT statement related to Enhanced Oil Recovery (EOR) techniques from the following options.
A measure of the potential of crude oil to form surfactants for Enhanced Oil Recovery (EOR) is given by the Total Acid Number (TAN). TAN is the mass of \(\underline{\hspace{2cm}}\) (in milligrams) that is required to neutralize one gram of crude oil.
In Water-Alternating-Gas (WAG) injection, the purpose of the injection is to \(\underline{I}\) \(\underline{\hspace{2cm}}\) the "relative permeability" of gas and to \(\underline{II}\) \(\underline{\hspace{2cm}}\) the "mobility" of the gas.