Physical Simulation Experiment Method Of Fractured Ultra-low Permeability Reservoir And Its Application

In this paper, the main content is about the fractured ultra-low permeability reservoir physical simulation experiment method and its application. The one-dimensional core micro-fracture physical simulation method and two-dimensional outcrop model high-pressure physical simulation method were established for the first time. The influence of different factors on fluid porous flow rule in fractured ultra-low permeability reservoir was studied. Water flooding sweeping rule and oil distribution rule of oil field typical well group were analysed by using the physical simulation method. The main research results and understandings are as follows:(1) According to the micro-fracture generation mechanism in the ultra-low permeability reservoir, the tri-axial core testing experiment system was designed. Then the one-dimensional core micro-fracture formation method was formed. The dry sample fracture formation rule was then obtained by using this method, and the influence of creep deformation, confining pressure and the formation fluid on the formation of the micro-fracture was studied. According to the flow experiment result of the core samples with the micro-fracture in them, the influence of micro-fracture on formation fluid non-linear porous flow characteristics and oil-water two phase flow characteristics was analysed.(2) The scaling laws of two-dimensional model water flooding physical simulation was studied, which considering the nonlinear flow characteristics. After the ultra-low permeability outcrop model screening method, plate model vacuum pumping and saturation method, pressure field and flow field measuring method, natural fracture and hydraulic frature simulation method were established, the fractured ultra-low permeability reservoir two-dimensional high-pressure physical simulation experiment technology was formed combining the above methods. Then then influence of natural fracture and hydraulic fracture on porous flow rule was studied.(3) According to the oil field typical well group geological data, production data and the scaling laws, the well group experiment model was made. Then the physical simulation experiment was performed. The water flooding sweeping rule, oil distribution and the water source of the production well were analysed according to the experiment result. The initial well pattern deployment and high water cut stage well pattern adjustment suggestion of this kind of reservoir was finally provided.