Experimental Study And Numerical Simulation Of Flow Field In Cavity Construction Period Of Gas Storage Of Salt Rock

In order to resolve growing energy crisis, it is extraordinarily urgent to build energy strategic reserves among which the construction of underground gas storage is the priority. In the process of building underground gas storage, the manipulation for the form of cavity is the most significant. The popular technique now in producing cavities is to control over the forms of cavities by pumping fresh water or into them. Simultaneously, our country'main geologic condition is characterized with complex salt rock interlayer, which to a large degree, affects the distribution of flow field. Therefore, it is greatly important to carry out research on brines flow regularity and the relationship between the interlayer and flow filed in cavity-building period of salt cavern.This thesis will highlight brines flow regularity and the relationship between the interlayer and flow filed in cavity-building period of salt cavern. And the structure of this thesis is as follows:①The present research on the erosion mechanism of cavities in salt rock and cavity control are analysed and summarized, with the reference to our the sixth subject of our nation's 973 plan"Study on catastrophic Mechanism and Protection Theory of Underground Storages for Energy Reserves", namely"Mechanism of catastrophic Induced in Cavity Construction Period of Oil and Gas Storages", and then the main research contents and technical routes of this thesis are given.②Based on the theory of"Selected Physical Rule", a model experiment platform similar to true flow field in cavity-building period are created, combination with staining methods to test how the speed of pumping water, casing distance, state of interlayer and cavity-building period influence similar model experiments, and result in gaining the general moving regularity of cavity flow field under different circumstances.③This thesis will briefly introduce the measurement techniques and systematic constituents of PIV which will be used to perform flow field experiments on cavity models containing interlayer. Brines movement features in local area in cavity construction period are obtained.④Use of FLUENT software, RNG k-εonflow model theory and material transmission theory are introduced to study on the interaction between mud interlayer and brine moving in cavity construction period, and analyse the forcing situations of interlayer and the coactions between interlayer and flow field. ⑤The vector graph in Numerical Calculation of three observing zones are compared with correspondent PIV experiment results, and then conclude FLUENT numerical simulation in cavity construction period that can reflect real situations of cavity flow field in cavity construction period.