A Simulation System for the Roof Failure Process of Layered Salt Rock after Water Solution Mining

Abstract

The invention discloses a simulation system for the damage process of the roof after water-soluble mining of layered salt rock, which comprises a cuboid structural material box, the front side and the top surface of which are in an open state, and the front panel and the cover plate are respectively movably installed; the top of the cover plate There are vertical baffles around the surface, and threaded holes are equidistantly opened on the baffle; the inner side of the lower part of the material box is thickened to form a stepped support structure; the rear side of the material box and the top edges of the left and right sides are equidistantly opened Round holes; the thickened parts on the left and right sides of the material box and the front side of the bottom surface are equidistantly provided with round holes, and round holes are set around the front panel; the material box, cover plate and front panel are connected by fastening bolts; simulate the overlying rock formation There is a rock cavity below the rock cavity, and a pressure-resistant water bag is placed above it; a socket is set on the rock cavity, and one end of the cavity water injection pipe is inserted into the rock cavity, and the other end passes through the simulated overlying rock layer and the cover plate to connect to the brine pressurization device. ; The pressure-resistant water bag is connected to the water bag water injection pipe, and the water bag water injection pipe passes through the cover plate to connect to the water pressure pressurization device.

Description

technical field [0001] The present invention relates to the technical field of rock mass simulation test, and more specifically relates to a simulation system for the roof failure process of layered salt rock after water-solution mining. The failure process of the cavity roof after mining. Background technique [0002] my country's salt rock formations have layered characteristics and are thin in thickness. In order to improve the production efficiency, the double-well convection mining method is widely used. It has the advantages of large production capacity, fewer downhole accidents and improved recovery rate. Most of the abandoned salt caverns formed are horizontal cavities with larger spans, which can easily cause surface subsidence or even subsidence. [0003] Abandoned salt caverns can be used to store oil, natural gas and compressed air energy storage if they are properly transformed. Compared with the traditional pear-shaped cavity, when the thickness of the salt la...

AI Technical Summary

Problems solved by technology

Compared with the traditional pear-shaped cavity, when the thickness of the salt layer is constant, the biggest advantage of the horizontal cavity is that it has a larger volume. However, the roof span of the horizontal cavity is larger, and it is easier to scrap the storage due to the unstable roof.

In addition, due to the lack of planning in the early stage, protection measures such as oil cushions and air cushions were not adopted, resulting in many cavity roofs being directly exposed to brine

Under the long-term action of brine, the mechanical properties of the roof will be weakened to a certain extent, and the instability of the layered roof will be aggravated to a certain extent.

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