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SAP IS OIL AND GAS INTERVIEW QUESTIONS AND ANSWERS
What are offshore installations?
Oil and gas offshore installations are industrial towns at sea, carrying the personnel and equipment needed to access reservoirs thousands of feet below the seabed, and maintain continuous hydrocarbon production. The most important functions are drilling, preparing water or gas for injection into the reservoir, processing the oil and gas before sending it ashore, and cleaning the produced water for disposal into the sea.
Big fixed platforms may have all these functions in one location, but smaller platforms may be dedicated to just one function, such as drilling or gas compression. Some installations can be moved from one location to another, for example mobile drilling rigs and production FPSOs.
What are onshore installations?
These are installations on land and usually close to the sea which receive oil and gas from offshore installations via pipeline (or in the case of oil sometimes by tanker). These installations prepare the liquid products for further refining - but they are not the refineries. They also take the natural gas and make it suitable for piping into the National Grid. At some installations gas liquids are processed.
What actually happens offshore?
The popular image of offshore work often centers on a muddy drill floor, where wells are drilled to target the reservoirs of oil and gas below the surface - but this is only the beginning of the story.
The top end of each production well sprouts a branching series of pipes, gauges and valves called the 'Christmas tree'. At this point, crude oil is a hot, frothy, corrosive, high-pressure fluid containing gas, water and sand.