Underground water-sealing cave depot system, and oil storage method of underground water-sealing cave depot

Abstract

The invention provides an underground water-sealing cave depot system provided with a pressure adjusting gas chamber, and an oil storage method of an underground water-sealing cave depot. The pressureadjusting gas chamber arranged above an oil storage cave chamber is utilized for meeting a gas phase space requirement brought by a stored oil filling volume and an oil product medium physical change; and meanwhile, through controlling the gas pressure in the pressure adjusting gas chamber, a pressure difference between the oil product pressure in the oil storage cave chamber and the undergroundwater pressure outside the cave chamber can be balanced and adjusted, so that an effect on reducing the underground water inflow volume in the cave chamber is achieved. According to the technical scheme provided by the invention, the problems of oil gas leakage and large water seepage quantity easily caused by a gas phase space left in the cave chamber through a water level fixing method are solved, meanwhile, the water supply water seal pressure of a water curtain system is indirectly reduced, the problems of frequent equipment startup, complicated process control and high operation cost caused by a frequent water level change of a water level fluctuation method are further solved, and the underground water-sealing cave depot system and the oil storage method of the underground water-sealing cave depot have positive significances on construction and development of the underground water-sealing cave depot in China so as to have a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of underground water-sealed caverns, in particular to an underground water-sealed cavern system provided with a pressure-regulating air chamber, and also relates to an underground water-sealed cavern oil storage method. Background technique [0002] In 1939, Swede Jansson proposed the idea of ​​storing oil directly in unlined caverns below the groundwater level, and applied for a patent for the invention. In the late 1940s, the Swedes used fluorite pits to build the first underground unlined oil depot. This was the first time that heavy fuel oil was successfully stored in underground caverns. Around the 1960s, Sweden built the first underground unlined oil storage depot based on a fixed water cushion. Since then, underground water-sealed cavern oil storage depots (ie, underground water-sealed caverns) have been opened and widely used around the world. The technology of storing crude oil in underground water...

AI Technical Summary

Problems solved by technology

[0009] The inventor fully compared and deeply analyzed the characteristics of the fixed water level method and the variable water level method, and found that the biggest difference between the two methods lies in the way of handling the oil product loading and the change of the oil product medium. Therefore, on the basis of the existing technology, in order to overcome the defects in the prior art, the present invention provides a method that combines the fixed water level method and the variable water level method. Based on the new oil storage technology based on the storage principle, a set of underground water-sealed cavern system compatible with the new oil storage technology is provided, which not only solves the problem of gas phase space in the cavern of the fixed water level method, which is easy to cause oil and gas leakage and The problem of large water seepage, at the same time indirectly reduces the water supply water seal pressure of the water curtain system, and solves the problems of frequent equipment start-up, complicated process control and huge operating costs caused by frequent water level changes in the variable water level method.

Images