List of top Questions asked in GATE PE

During the core analysis, the following data are measured at laboratory and reservoir conditions.

The capillary pressure at the laboratory condition is 50 psi. The calculated capillary pressure using the Leverett J-function at the reservoir condition is ________________ psi (rounded off to two decimal places).

An oil well (wellbore radius = 0.5 inch) in a heavy oil reservoir (drainage radius = 745 ft, oil viscosity = 500 cP) is being operated at 200 rb/day and 150 psi under the radial steady state flow regime. A huff and puff steam injection is planned to reduce the oil viscosity to 35 cP. The steam soaks into the reservoir up to a distance of 65 ft from the centre of the wellbore. The new production rate at the downhole condition after the steam stimulation is ____________ rb/day (rounded off to two decimal places).

Well testing is to be conducted on the bounded sandstone reservoirs as shown in the figures. All the reservoirs have the same drainage area, rock and fluid properties, and well bore conditions. Which of the following statements are CORRECT for the given reservoirs?

The log data obtained for a particular well section are shown in the following figures. Identify the CORRECT interpretations for different zones.

Identify the CORRECT match for the flow regimes (Group 1) with the corresponding slopes of the pressure derivative (Group 2) used in the type curve analysis.

Capillary pressure (\(P_c\)) vs water saturation (\(S_w\)) curves for different sandstone reservoirs (I, II, III and IV) are given in the following figure.

Which reservoir has the most uniform pore size distribution?

Flow tests are conducted for oil well in reservoirs P, Q, R and S having different parameters as given in the following table. In all the four cases the wells are tested at 1200 stb/day.

Identify the reservoir in which the pressure transient reaches earliest at a point 2000 ft away from the wellbore.

A real gas is produced from a gas reservoir at a constant temperature of 30°C. The compressibility factor (\(Z\)) is observed to change with pressure (\(P\)) at a rate of \[ \left( \frac{\partial Z}{\partial P} \right)_T = Z^2 \] The difference in the compressibility of the real gas from the ideal gas at a given pressure (\(P\)) and temperature (\(T\)) is:

Which ONE of the following options is the CORRECT match of contaminants and their effluent treatment techniques?

A drilling mud with high gel strength is undesirable because it

An oil well is drilled using an 8.5-inch drill bit at a penetration rate of 30 ft/hr. The rotary speed is 20 rpm and the weight on the bit is 3500 lb. The value of the ‘d’ exponent for the drilled section is ________________ (rounded off to two decimal places).

A vertical wellbore is drilled with a 12.25-inch drill bit. While drilling, the bit could drill a total rock volume of 385 ft\(^3\) in 6.5 hr. After drilling, the hole diameter throughout the depth is found to be 12.49 inch. The average rate of penetration is ____________ ft/hr (rounded off to two decimal places).

A reservoir is producing oil at 7000 stb/day with a producing gas to oil ratio (GOR) of 2000 scf/stb. At a certain point of time, the reservoir pressure is monitored and decided to be maintained at a constant pressure of 2500 psi using water injection. The PVT properties estimated at 2500 psi are:

Bubble point pressure = 3000 psi
Oil formation volume factor = 1.2 rb/stb
Water formation volume factor = 1.0 rb/stb
Gas formation volume factor = 0.0012 rb/scf
Solution GOR = 300 scf/stb
The initial water injection rate (stb/day) required to maintain oil production at 7000 stb/day is ________________ (rounded off to the nearest integer).

A homogeneous sandstone reservoir is under a radial steady state flow. The wellbore radius is 0.1 m. The formation near the wellbore is damaged up to 0.9 m from the sand face. The permeability impairment results in \( k/k_s = 5 \), where \( k \) is the permeability in the undamaged region and \( k_s \) is that of the damaged region. The value of skin factor is (rounded off to two decimal places) ______________.

The flammable gas detector works on which of the following phenomena?

The logging tool(s) preferred for the measurement of formation resistivity in a well drilled with oil-based mud is/are:

Which of the following properties of Matrix \(A = \begin{bmatrix} 1 & 0.5 & 0 \\ 0.5 & 1 & 0.5 \\ 0 & 0.5 & 1 \end{bmatrix}\) are CORRECT?

Simpson’s one-third rule will give the exact value of the integral \[ I=\int_a^b \left[ b_0 + b_1 x + b_2 x^2 + \cdots + b_n x^n \right] dx \] (where \(a, b, b_0, b_1, b_2, \ldots, b_n\) are numeric constants), if the values of \(n\) are:

Which of the following are NOT CORRECT during the operating cycle of a ‘sucker rod pump’?

The liquid shrinkage curves for different types of crude oil are shown in the following figure.

Which curve represents the Black Oil?