Oil-gas displacement process for underwater oil storage tank
An oil storage tank, oil and gas technology, applied in the field of offshore oil engineering, can solve the problems of heat loss, complex replacement process, difficult to maintain the temperature of crude oil, etc., to achieve the effect of reducing process, avoiding environmental pollution and oil loss, and avoiding heat loss
Active Publication Date: 2012-07-11
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 tank, and seawater is poured into the interior as the underwater storage tank. Ballasting of oil tanks. The present invention adopts following steps:
[0028] The first step is to replace the air in the oil storage tank with nitrogen:
[0029] The initial state of the underwater oil storage tank 18 is as follows: figure 1 As shown, after the underwater oil storage tank 18 is in place, it is an empty state in the oil storage tank 18. At this time, there is air in the oil storage tank 18. Before putting into production, the air in the oil storage tank 18 is all Replaced with nitrogen.
[0030] Use nitrogen to replace the air. There are two ways to replace the air.
[0031] One is the step-up replacement meth...
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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 whenthe 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-gas replacement process, in particular to an oil-gas replacement process in an underwater oil storage tank that uses nitrogen as a replacement gas source for underwater oil-gas replacement and at the same time uses external circulation heating to maintain the crude oil temperature of the underwater oil storage tank. It belongs to the field of offshore oil engineering. Background technique [0002] With the expansion of the field of offshore oil exploration and development, the underwater oil storage method has broad application prospects in offshore oil exploitation because of its safety, low cost, and large capacity. The underwater oil storage tank can avoid the impact of wind and waves. When the weather is bad, the oil well can continue to produce; and the seawater above the oil storage tank can protect the oil tank from danger caused by fire and lightning. It is more suitable for the development of marginal oil field...
Claims
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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