Inverted-pear-shaped underground salt cavern gas storage field and establishing method thereof

Abstract

The invention belongs to the field of oil and gas resource development, and particularly relates to an inverted-pear-shaped underground salt cavern gas storage field and an establishing method thereof, wherein the salt carven gas storage field comprises a well completion tubular column, an injection-production tubular column, a central tubular column, cement rings and a salt cavern; the well completion tubular column extends from the ground surface into the salt cavern and is connected with the top of the salt cavern; the injection-production tubular column is positioned in the well completion tubular column and connected with the bottom of the well completion tubular column through a packer; and the central tubular column is positioned in the injection-production tubular column and hung on well head equipment. The salt cavern is shaped as an inverted pear, with the top part taking a round plane, the middle part taking a combined surface of a paraboloid and a spherical surface, and the bottom part taking a round plane. The establishing method of the salt cavern comprises steps as follows: determining the height, determining the lower structure size, determining the bottom round plane size, determining the upper structure size, determining the top round plane size, determining the thickness of the salt rock layers at the top and the bottom, selecting the tubular columns, and controlling the cavity shape. The salt cavern gas storage field has simple design process and clear mechanic mechanism, does not increase the difficulty and time for forming the cavity, and does not remarkably increase the cost.

Description

technical field [0001] The invention belongs to the field of oil and gas resource development, and in particular relates to an inverted pear-shaped underground salt cavern gas storage and a construction method thereof. Background technique [0002] Field engineering experience and existing research results show that rationally designing the shape of the salt cavern gas storage can effectively reduce the volume shrinkage rate and cavity wall deformation of the salt cavern, and improve its stability and safety. Since the shape design of salt-cavern gas storage involves many issues, such as geomechanics theory, salt rock strength, creep characteristics, and criteria for salt-cavern failure discrimination, etc., the shape design of salt-cavern gas storage has always been a difficult point in the construction of salt-cavern gas storage. one of the problems. [0003] Many scholars have conducted research on related issues. For example, Dennis studied the shape of underground salt...

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Problems solved by technology

[0005] (1) The mechanical mechanism of the shape design of the underground salt cavern gas storage is not clear, and the design parameters of the salt cavern shape have not been optimized;

[0006] (2) The design method is relatively simple, mainly based on numerical

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