Study Of Mechanism And Optimization Setting About Large Underground Water Oil Storage's Water Curtain System

Underground water seal oil with less land,high safety,and the advantages of short construction period,become the strategic petroleum reserve the preferred way to many countries.Underground water-sealing oil storage is the main way of underground gas storage,storage,water seal is the key to whether the above the cavity to form a stable water cover layer,the formation of water cover need cavity at the top of the water curtain hole has good connectivity.Due to the imperfection of the water seal conditions theory,by setting the artificial water curtain to provide water,make the cavity in a saturated state.Thus,drencher system set up complete,can achieve the desired effect,can be connected each other enough to make the cavity overall is in a state of full water is the key of the underground structure can safe storage.Based on the national natural science foundation of China(40902086?41572301),the energy department of underground water seal oil depot based on relevant research projects,national strategic petroleum reserve the engineering background of huizhou water seal terminal,research library site area of joints and fissures and groundwater distribution,based on the analysis of the water curtain connectivity test results under the condition of existing water curtain setting,studies the connectivity of the whole water curtain system discriminant criteria and improvement measures.Under this premise,constructs the fissure water curtain hole injection diffusion model,the water curtain hole water injection conditions,the pore water pressure diffusion equation,and on this basis,applied to the numerical model,for the water curtain hole setting scheme provides the basis for more reasonable.This paper mainly in the following aspects to do the research and the corresponding conclusions:(1)Through the analysis of hydrological geology survey,combined borehole hydrogeological test,research library site area groundwater types and distribution of combined with years of rainfall data repository site area,the change law of underground water level.(2)Roadway and location main cavity on the surface,water curtain of structural plane occurrence measurement statistical analysis,to read and parse drencher borehole imaging data.Research based on the statistical data of the whole library site area advantage of joint development regularities,focusing on water curtain hole in the flat joint fissure occurrence,to optimize the setting scheme of water curtain.(3)Drencher connectivity test results based on the field(single-hole water injection-down test and water curtain effectiveness test)analysis of the existing water curtain setconditions,studies the connectivity of the whole water curtain system discriminant criteria and improvement measures.(4)Based on 3DEC discrete element software,set the parameters of water curtain system(aperture,hole spacing,azimuth,etc.)through numerical optimization.(5)By using the theory of fluid-structure interaction based on 3DEC discrete element software research water curtain hole equivalent to the feasibility of the stable water cap and presence of drencher system under the condition of surrounding rockmass stress field,seepage field and the change of displacement field.