ABSTRACT:

Taking the project in China as background, established a physical model experimental platform to simulate the cavity construction using the similar theory. The influence of interlayer to the cavity construction was studied. It was found: when the interlayer exists, the flow field becomes more complex; and the brine distribution besides the interlayer will be changed. Thus the dissolution of salt rock besides the interlayer was affected which results the triangle insoluble inclination appearing on the top of the interlayer, making the cave building inefficient and being not conducive to the cave shape control. It is the key to make the interlayer reasonable collapse in cavity construction.

1 INTRODUCTION

Rock salt is a kind of soft rock, and it has excellent physical and mechanical properties of the low permeability and good self-healing ability which make it to be widely recognized as the ideal energy underground storage sites. The underground energy storage of Salt rock has been built and accomplished successfully widely in many countries. Foreign researchers have studied on the mechanism of flow and controlled dissolution of salt in solution mining, the solubility properties of rock salt, and the shape control techniques of cavities in salt formation for underground gas storage (Hossein & Jessen 1964, Ehgartner et al. 2009, Fuenkajorn 2010). Relative to the foreign large salt dome landscape, there are many layers of mudstone in salt beds which has a thin single layer. And such special geological conditions increase the difficulty of solution mining in the control of cavity shape and stability of the cavity, making caverns irregular shape and poor mechanical properties, which is less than the expectations of the desired effect. The collapse of the interlayer may damage the casing of the cave, and influence the shape of the cavity, which is a trouble for cavity building.

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