Offshore Platforms and Station Keeping - Offshore Drilling and Production Practices - Petroleum Engineering Previous Year Questions

1

2016 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2016

The three translational motions for a floating vessel are

A

Roll-Pitch-Yaw.

B

Heave-Pitch-Sway.

C

Surge-Sway-Heave.

D

Roll-Sway-Heave.

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2

2016 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2016

For a floating vessel, match the CORRECT pairs from Group 1 and Group 2 among the options given below. (B = Centre of buoyancy, G = Centre of gravity and M = Metacentre)

A

P-II, Q-III, R-I and S-II

B

P-I, Q-III, R-II and S-I

C

P-III, Q-I, R-II and S-III

D

P-I, Q-II, R-III and S-I

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3

2018 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2018

The factor on which the selection of an offshore platform for the reservoir does NOT depend:

A

Water depth

B

Reservoir fluid properties

C

Sea bed conditions

D

Best case weather forecast

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4

2020 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2020

Select the correct combination of a floating vessel motion in a horizontal plane (P) and a vertical plane (Q)

A

P: (Surge, Sway, Yaw) and Q: (Heave, Roll, Pitch)

B

P: (Heave, Roll, Pitch) and Q: (Surge, Sway, Yaw)

C

P: (Surge, Roll, Pitch) and Q: (Heave, Sway, Yaw)

D

P: (Surge, Sway, Pitch) and Q: (Heave, Roll, Yaw)

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5

2020 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2020

Q.No. 46 A cuboidal wooden block of density 750 kg/m³, with horizontal dimensions of 2.0 m × 1.0 m and vertical height of 0.8 m, floats in water (density = 1000 kg/m³). The acceleration due to gravity is 9.81 m/s². The distance between center of gravity and metacenter of the block (rounded off to two decimal places) is ______ m.

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6

2021 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2021

MOPU (in the context of offshore drilling and production systems) stands for

A

Mobile Offshore Process Unit

B

Mobile Offshore Piping Unit

C

Mobile Offshore Production Unit

D

Mobile Oil Production Unit

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7

2021 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2021

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

GROUP I	GROUP II
(P) Semi-submersible platform	(I) Tether
(Q) Spar platform	(II) Turret Mooring
(R) Tension leg platform	(III) Catenary Mooring
(S) FPSO	(IV) Column Stabilised Unit

A

P – IV, Q – III, R – I, S – II

B

P – II, Q – III, R – I, S – IV

C

P – III, Q – I, R – IV, S – II

D

P – I, Q – IV, R – II, S – III

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8

2022 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2022

‘Cupola’ offshore storage tank is an example of

A

floating storage type.

B

above-water storage type.

C

submerged storage type.

D

platform storage type.

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9

2024 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2024

The speed of Tsunami is a function of

A

only water depth.

B

only wave height.

C

both water depth and wave height.

D

both wind speed and wave height.

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10

2024 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2024

Which ONE of the following is a POSITIVELY BUOYANT floating structure?

A

Jacket Platform

B

Semi-Submersible

C

Tension Leg Platform

D

Barge

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11

2024 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2024

The diameter and draft of a freely floating classical upright spar without moonpool is 30 m and 75 m, respectively. The added mass in heave mode is 1.8 times the mass of the spar.
The critical damping of the spar in heave mode is ______ × 10⁶ kg/s (round off to one decimal place).
Take, π = 3.14.
Density of seawater = 1025 kg/m³.
Acceleration due to gravity = 10 m/s².

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12

2024 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2024

A long vertical hollow steel pipe used as a column in an offshore structure follows Euler’s column theory. The length, outer diameter and thickness of the pipe are 30 m, 0.50 m, and 0.03 m, respectively.
The Euler buckling load (assuming no environmental loads) of the pipe pinned at both the ends, is ______ kN (round off to one decimal place).
Take \(\pi = 3.14\).
Young’s modulus of elasticity for steel = 210 GPa.

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13

2025 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2025

Which of the following offshore drilling platform(s) has/have legs on the seabed?

A

Jack up

B

Tension leg

C

Concrete gravity

D

Semi-submersible

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14

2023 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2023

Which of the following offshore rigs has the HIGHEST water depth of operation?

A

Submersible drilling barge

B

Jackup rig

C

Jacket platform

D

Semi-submersible rig

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15

2023 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2023

Figure shows an inextensible catenary mooring cable in still water. The submerged weight (per meter length), and the anchor radius (x) are 100 kg/m and 50 m, respectively. If horizontal tension (T_h) in the catenary is 1600 kg, the catenary length (AB) is __________ m (rounded to two decimal places).

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16

2023 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2023

An empty steel pipeline with massless endcaps has an outer diameter, D, and thickness, t. The density of steel is 7850 kg/m³. The critical D/t ratio at which the pipeline starts floating in seawater of density 1025 kg/m³ is __________ (rounded to two decimal places).

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17

2023 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2023

A four-column semi-submersible floater is located offshore. The diameter of each column is 5 m. Consider the total displaced weight of seawater of the semi-submersible as 4000 tonnes. Assume added mass contribution as 50% of the semi-submersible weight, and seawater density as 1025 kg/m³.
(Acceleration due to gravity = 9.81 m/s²)
The natural period of oscillation of the floater in vertical mode is __________ seconds (rounded to one decimal place).

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18

2026 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2026

Which of the following statements is NOT CORRECT in the context of offshore operational environment?

A

The motion of ocean’s surface can be due to energy transfer from wind to water.

B

Lunar tides are caused by the moon.

C

Solar tides are caused by the sun.

D

The motion of ocean’s surface can be due to energy transfer from water to wind.

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19

2026 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2026

Which of the following statements is/are CORRECT about the water injection well platforms?

A

These are meant for injection of gas through the injection well.

B

Metering devices are not required to determine injection rate of injection wells.

C

Metering devices are required to determine injection rate of injection wells.

D

Firefighting and life-saving equipment should be present on the platform.

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20

2026 · Petroleum Engineering · Offshore Drilling and Production Practices · Offshore Platforms and Station Keeping

Petroleum Engineering (PE) 2026

Which of the following statements is/are CORRECT about the floating production, storage, and offloading systems (FPSOs)?

A

Existing tankers cannot be converted into FPSOs.

B

FPSOs can be selected in the absence of any pipeline infrastructure.

C

FPSOs cannot process the produced fluids.

D

FPSOs can be used for the storage of produced crude oil.

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