Oil-gas displacement process for underwater oil storage tank
An oil storage tank and process technology, applied in the field of offshore petroleum engineering, can solve the problems of difficult to maintain crude oil temperature, heat loss, complicated replacement process, etc., and achieve the effect of avoiding heat loss, reducing process, avoiding environmental pollution and oil loss.
Active Publication Date: 2011-05-11
CHINA NAT OFFSHORE OIL CORP +1
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In addition, there is heat loss during the replacement process, it is difficult to maintain the temperature of crude oil and the replacement process is complicated
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[0027] Such as Figure 1-Figure 3 As shown, the underwater oil storage tank is provided with several ballast tanks 17 and several oil storage tanks 18. The ballast tanks 17 are generally arranged on both sides and the middle and lower parts of the underwater oil storage tanks, and the interior is filled with sea water as underwater storage tanks. Ballast of oil tanks. The present invention adopts the following steps:
[0028] The first step is to replace the air in the storage tank with nitrogen:
[0029] The initial state of the underwater oil storage tank 18 is as figure 1 As shown, after the underwater oil storage tank 18 is in place, the oil storage tank 18 is empty. At this time, the oil storage tank 18 is air. Before putting into production, all the air in the oil storage tank 18 Replace with nitrogen.
[0030] There are two ways to replace air with nitrogen.
[0031] One is the boost replacement method: namely
[0032] (1) Fill the oil storage tank 18 with a certain amount of...
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The invention discloses an oil-gas displacement process for an underwater oil storage tank, which comprises the following steps of: 1, in an empty state, displacing all air in the oil storage tank into nitrogen by using nitrogen; 2, when oil is fed, delivering the crude oil into the underwater oil storage tank, and discharging the nitrogen till the crude oil in the oil storage tank reaches the specified height; 3, when the oil is discharged, opening the valve door of an outward delivery control valve, starting a crude oil lift pump, and delivering the crude oil outwards through an oil delivery pipe; meanwhile, after the nitrogen pressure in the oil storage tank is reduced to the specified pressure, opening a pressure control valve so that the nitrogen enters the underwater oil storage tank, and when the liquid level in the oil storage tank is reduced to the specified height, closing the crude oil lift pump to stop outward delivery; and 4, performing outer circular heating, namely when the average temperature of the crude oil in the oil storage tank 18 is reduced to the specified temperature is detected, starting the outer circular heating flow. The process is simple, avoids environmental pollution and oil product loss due to the oil mixing problem, and meanwhile, avoids heat loss because oil and water are directly contacted.
Description
Technical field [0001] The invention relates to an oil and gas replacement process, in particular to an oil and gas replacement process for an underwater oil storage tank that uses nitrogen as a replacement gas source to perform underwater oil and gas replacement, and at the same time, uses external circulation to heat the underwater oil storage tank to maintain the crude oil temperature of the underwater storage tank. It belongs to the field of offshore oil engineering. Background technique [0002] With the expansion of offshore oil exploration and development fields, underwater oil storage methods have broad application prospects in offshore oil exploitation due to their safety, low cost, and large capacity. The underwater oil storage tank can avoid the impact of wind and waves, and the oil well can continue to produce in bad weather; and the sea water above the oil storage tank can protect the oil tank from fire and lightning. It is more suitable for the development of margi...
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IPC IPC(8): B67C3/00B67C9/00
Inventor 钟小侠李志刚刘培林蔡振东曾树兵张艳芳李豫武明
Owner CHINA NAT OFFSHORE OIL CORP