Method for constructing salt-cavern gas storage base

Abstract

The invention relates to a method for constructing a salt-cavern gas storage base. The method comprises the following steps that 1, an L-shaped horizontal well is drilled from the ground, wherein theL-shaped horizontal well comprises a vertical well segment, an inclined well segment communicated with the vertical well segment and a horizontal well segment communicated with the inclined well segment, and the horizontal well segment of the L-shaped horizontal well is located in the middle of a salt layer; 2, an upper casing pipe column is disposed on the vertical well segment and the inclined well segment, a fixing structure for fixed connection and sealing is adopted between the upper casing pipe column and a stratum, and a combined pipe string is placed in the horizontal well segment; 3,a flushing pipe column is placed into the combined pipe string, water is sprayed to the surrounding salt wall through a mesh hole of a screen pipe in order to impact the salt wall to form melting chambers, jetting nozzles are located from far to near, each screen pipe sub-segment is adopted for melting the salt layer, finally a series of the melting chambers are formed, and thus the salt-cavern gas storage base is obtained. According to the method for constructing the salt-cavern gas storage base, the construction speed is high, the capacity is large, and the comprehensive cost is low.

Description

technical field [0001] The invention relates to the field of natural gas utilization, in particular to a construction method of a salt cavern gas storage. Background technique [0002] In order to solve the contradiction between the constancy of upstream natural gas supply and the volatility of downstream natural gas demand, many countries and companies choose to build gas storage near the consumption area. Salt cavern gas storage is the main one. The existing salt cavern gas storage construction method mainly includes: drilling a vertical well in a salt-bearing stratum, injecting fresh water to dissolve the salt rock to form an inverted pear-shaped salt cavern gas storage, such as the salt cavern gas storage disclosed in the invention patent with the publication number of CN102720538B. The cavern gas storage structure, or the salt cavern gas storage in the shape of a gourd and an upper cylinder and a lower cone, such as the gas storage structure disclosed in the invention ...

AI Technical Summary

Problems solved by technology

To build a cavity in a vertical well, layered dissolution is required to obtain the corresponding shape, the construction speed is slow, the cost of the gas storage is high, and the gas storage capacity is limited, especially for relatively thin saline formations, because the vertical length of the gas storage is reduced, compared with In thick saline formations, the volume of the gas storage is relatively small, and the cost performance is very low, and even loses the value of building the gas storage, resulting in a waste of resources

Moreover, if multiple such vertical well-type gas storages are to be built, the ground floor area and the cost of ground treatment equipment will be greatly increased, which will also seriously restrict the enthusiasm of salt cavern gas storage.

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