Transformation method for irregular salt cavern

Abstract

The embodiment of the invention provides a transformation method for an irregular salt cavern. The method comprises the steps that compressed air is injected into the irregular salt cavern via a casing; fresh water is injected to the bottom of the irregular salt cavern via a center pipe; the pressure of the compressed air is adjusted, and thus hydraulic balance between the pressure of the compressed air and the pressure of the fresh water can be achieved, and an air-water interface is formed, wherein the air-water interface prevents the fresh water from flowing to the upper part of the salt cavern with the air-water interface and dissolves salt rocks on the lateral side of the upper part of the salt cavern with the air-water interface; and the fresh water dissolves salt rocks of the irregular salt cavern located on the lateral face of the lower part of the air-water interface, thus the radius of the irregular salt cavern on the lateral face of the lower part of the air-water interface can be increased, and the transformed salt cavern can be obtained when the expanded irregular salt cavern reaches a preset scope. The method has the advantages that the high cost generated by use of an oil cushion can be reduced; the method can be easily implemented from the technological level; and finally the irregular salt cavern can be transformed into an oil-gas storage cavern with high values.

Description

technical field [0001] The invention relates to the field of salt chambers, in particular to a method for transforming deformed salt chambers. Background technique [0002] At present, in order to solve the increasingly serious energy crisis, it is imperative to establish an energy strategic reserve, and the construction of an underground salt cavern reserve is the most important part of the energy strategic reserve. The underground salt cavern store is generally based on a single well oil pad The water-soluble mining method is used for construction, and the oil density is lower than water, and the characteristics of floating on the upper part to control the upper dissolution are used to help build the cavity; but when the process is not implemented properly, or the geological conditions are not clearly understood, it is easy to appear columnar with too small lateral size Malformed cavities, rendering the cavities unusable for energy storage. At this time, if the oil cushio...

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Problems solved by technology

[0002] At present, in order to solve the increasingly serious energy crisis, it is imperative to establish an energy strategic reserve, and the construction of an underground salt cavern reserve is the most important part of the energy strategic reserve. The underground salt cavern store is generally based on a single well oil pad The water-soluble mining method is used for construction, and the oil density is lower than water, and the characteristics of floating on the upper part to control the upper dissolution are used to help build the cavity; but when the process is not implemented properly, or the geological conditions are not clearly understood, it is easy to appear columnar with too small lateral size Malformed cavity, rendering the cavity unusable for energy storage

At this time, if the oil cushion mining method is still used to modify the dissolved cavity, it will not only consume a lot of oil and cost a lot, but also the technology is difficult to implement

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