List of practice Questions

A cylindrical crude oil reservoir with a radius of 3000 ft is under water influx from a cylindrical aquifer with an estimated radius of 9000 ft. The reservoir has the following properties. 
\(\text{Aquifer thickness, } h = 40 \, \text{ft}, \text{ Porosity, } \phi = 15%, \)
\(\text{Formation compressibility, } C_f = 4.5 \times 10^{-6} \, \text{psi}^{-1}, \text{ Water compressibility, } C_w = 4.0 \times 10^{-6} \, {psi}^{-1}.\) 
Assuming a pot reservoir model with fractional encroachment angle as unity, the water influx into the reservoir for a pressure drop of 700 psi is \(\underline{\hspace{2cm}}\) MMbbl (million barrels) (round off to two decimal places).

Match the platforms (GROUP I) with appropriate support systems (GROUP II). 
 

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

The following equations describe the transient fluid flow in a typical petroleum reservoir system. Here, \( p \) is pressure, \( x \) and \( r \) are the spatial coordinates in rectangular and cylindrical systems respectively, and \( t \) is time. Also, \( \phi \) (porosity), \( \mu \) (viscosity), \( c_f \) (formation compressibility), \( c_t \) (total compressibility) and \( k \) (permeability) are constant coefficients. 
Match the equations (GROUP I) with their corresponding descriptions (GROUP II). 
 

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

Match the following wire-line logging methods (GROUP I) based on the physical principles of measurements (GROUP II). 

Identify the following well test methods corresponding to the transient pressure profiles in the figures given below. (BHP: Bottom-hole pressure, BOPD: Barrels of oil per day) 
 

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

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

The estimate for the root of the function \( f(x) = e^{2x} + 2x \) after one iteration with an initial guess of \( x_0 = 0 \), using the Newton-Raphson method is \(\underline{\hspace{2cm}}\) (correct up to two decimal places).

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. 

Heavy oil recovered from reservoirs can be represented by $C_xH_{1.5x}$. Suitable processes to reduce the density of heavy oil are
 

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

The primary function of the thruster in the Dynamic Positioning System of an offshore installation is
Which ONE of the following offshore installations uses Dynamic Positioning System for station keeping?
Which ONE of the following is NOT a primary safety system for offshore installations?
Which ONE of the following statements is INCORRECT?
MOPU (in the context of offshore drilling and production systems) stands for
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?
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?
Which ONE of the following options can be used to quantify secondary porosity?
Select the CORRECT firefighting system for electrical switchgear room in an offshore facility.
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:
- \( R = 8.314 \, \text{m}^3 \, \text{Pa.K}^{-1} \, \text{mol}^{-1} \)
- \( R = 10.731 \, \text{psi.ft}^3 \, \text{lb.mol}^{-1} \, \text{ºR}^{-1} \)
- \( R = 0.082 \, \text{L} \, \text{atm.K}^{-1} \, \text{mol}^{-1} \)
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).