GATE Petroleum Engineering Practice Quiz

Question 1

A sandstone core plug has length $5\,\text{cm}$, cross-sectional area $10\,\text{cm}^2$, and is fully saturated with brine of viscosity $1\,\text{cP}$. Under a pressure drop of $2\,\text{atm}$, the measured flow rate is $4\,\text{cm}^3/\text{s}$. Using Darcy's law, the absolute permeability is closest to

Accepted Answer

$10\,\text{D}$

Question 2

A reservoir oil has initial oil formation volume factor $B_{oi}=1.25\,\text{rb/STB}$. If the stock-tank oil initially in place is $8\times 10^6\,\text{STB}$, the initial reservoir volume occupied by oil is

Accepted Answer

$1.0\times 10^7\,\text{rb}$

Question 3

For a normally pressured hydrostatic water column with density $1.0\,\text{g/cm}^3$, the pressure gradient is approximately

Accepted Answer

$0.433\,\text{psi/ft}$

Question 4

A well is producing at stabilized radial flow from a reservoir with $k=50\,\text{mD}$, $h=30\,\text{ft}$, $\mu_o=2\,\text{cP}$, $B_o=1.2\,\text{rb/STB}$, $p_e=3000\,\text{psi}$, $p_{wf}=2500\,\text{psi}$, $r_e=1000\,\text{ft}$, $r_w=0.5\,\text{ft}$, and skin $s=0$. Using $q=\frac{0.00708kh(p_e-p_{wf})}{\mu B[\ln(r_e/r_w)+s]}$, the oil rate is closest to

Accepted Answer

$290\,\text{STB/day}$

Question 5

In a drillstring, if weight on bit is increased beyond the optimum while rotary speed and hydraulics remain unchanged, which outcome is most likely in many formations?

Accepted Answer

Rate of penetration may decrease due to bit balling, poor cleaning, or inefficient cutting removal

GATE Petroleum Engineering

Practice Quizzes

GATE Petroleum Engineering Practice Quiz

Porosity and Permeability Measurement Fundamentals | GATE Petroleum Engineering