Study Of The Physical Model Of Single-well Commingling Production In The Low Pressure And Tight Gas Reservoirs And Geologic Agent Analysis

Thesis is assessed based on the types of sub-facies, reservoir petrologic characteristics, physical characterization, pore structural features and reservoir heterogeneity characteristics in Daniudi gas field. This paper have analyzed the energy of gas pools, fluid properties, T P system, gas pool type and process engineering of commingling production in combination with development geologic feature in gas field. The essay concludes that commingling production probable made interlayer interference because the pressure system, reservoir petrophysical and productivity difference. Those reasons made the commingled producing well of productivity inhibition and reduced formation final recovery. In order to ensure high-efficiency development gas fields and pay attention to recovery efficiency, and many factors that physical model of gas reservoir, fluid, pressure, temperature and rate of production are considered in this research. We design combined core experimental facility of petrophysics and it can reflect fact of gas reservoirs. According to the microfacies, lithology, porosity and permeability of principal producing formation in researched area, combined cores are selected and assembled for experiments. Neural network mathematics model applied for analysis results and prediction of the physical simulation experiments. The effects of recovery gas reservoirs are evaluated by different geologic feature of productions and the different time of commingling production. It can provide reference for time of commingling production in different geologic feature of productions. When commingling production develop these low pressure and tight gas reservoirs, through the above analysis, we need pay attention to recovery efficiency of single-well, for higher levels of gas reservoirs development are obtained. Under avoid interlayer interference conditions, when the pressures of different productions are equation, commingling production need carry out as early as possible. Maximum pressure difference in different productions is 3.67MPa in upper Paleozoic of Daniudi gas field. It has built solid material foundation which is early stage commingling production.