Question

Which of the following is/are objective(s) of a safety system in offshore production platforms?

• A. To prevent leak or overflow of hydrocarbons
• B. To prevent ignition of hydrocarbons released on the platform
• C. To prevent water coning in the reservoir
• D. To prevent gas coning in the reservoir

Hint:

Platform safety systems guard against hydrocarbon release and ignition, not reservoir coning behavior.

Answer 1

The Correct Option is A, B

Step 1: Understand the scope of an offshore platform safety system:
Offshore production platforms use dedicated process safety systems, including emergency shutdown systems, pressure safety valves, level controls, blowdown systems, and fire and gas detection networks. These systems are all designed around one central goal, keeping hydrocarbons safely contained within the process equipment and preventing any release from turning into a fire or explosion. They operate at the surface facility and are separate from reservoir management decisions made below the seabed.
Step 2: Check option A, prevent leak or overflow of hydrocarbons:
Level controllers, high level alarms, pressure safety valves, and emergency shutdown valves are all installed specifically to detect an abnormal condition, such as rising liquid level in a separator or overpressure in a vessel, and to isolate or vent the system before hydrocarbons leak or overflow from the equipment. This containment function is the first and most direct objective of the safety system, so option A is correct.
Step 3: Check option B, prevent ignition of hydrocarbons released on the platform:
Even with containment measures in place, a small release can still occur, so the safety system also includes fire and gas detectors, explosion proof and intrinsically safe electrical equipment, hazardous area classification, and automatic shutdown of ignition sources the moment gas is detected. The purpose is to stop any released hydrocarbon vapor from finding an ignition source and causing a fire or explosion, so option B is correct.
Step 4: Check option C, prevent water coning in the reservoir:
Water coning is the upward movement of the water oil contact toward a perforation interval caused by excessive drawdown, and it is controlled through reservoir engineering decisions such as limiting production rate, adjusting perforation placement, or using downhole completion design. This is a reservoir management issue, not something handled by the platform's process safety system, so option C is not correct.
Step 5: Check option D, prevent gas coning in the reservoir:
In the same way, gas coning from an overlying gas cap toward the perforations is also managed through reservoir and production engineering choices, such as controlling drawdown and choke settings, and again has nothing to do with the platform's leak, fire, and explosion prevention systems, so option D is not correct.
Final Answer:
\[ \boxed{\text{Options A and B: preventing leaks and preventing ignition}} \]