Research On The Theory Of Complicated Porous Flow And Analysis Method Of Well Test For Multilayer Reservoirs

Many of the multilayer reservoirs were developed using multilayer commingling with the underground oil and gas percolation theory being the basis of development well testing analysis technology can provide technical support for the efficient development of oil reservoir. To settle the series of complicated oil and gas porous flow caused by multilayer commingled production, a model for multilayer commingled production porous flow was established and a study on well test analysis was conducted. According to the characteristics of different reservoirs, all kinds of physical mathematical models about multilayer commingled production porous flow was established and solved; the sample curve of well test analysis theory was drew and sensitivity characteristics of parameters was analyzed. At the same time. research into the unification of the re’servoir porous flow model and into the modern well test analysis methods of multilayer reservoir commingled production was also conducted.Main research models include:(1) Multilayer commingled production porous flow model without interlayer channeling(N-layer commingled production homogeneous model, N-layer commingled production two composite reservoir model and N-layer three composite reservoir commingled production model), study was focused on the effect of variable wellbore storage coefficient and other parameters on the sensitivity characteristics of type curves. Study also went’to the production changing curves of every layer;(2) Multilayer commingled production porous flow model with consideration interzonal crossflow (two layers commingled production model, Three layers commingled production model and four layers of commingled production model), emphasis was attached to the effect of interzonal crossflow coefficient and parameters such as storage ratio on the sensitivity characteristics of type curves;(3) Multilayer commingled production composite porous flow model with consideration interzonal crossflow (two layers commingled production two composite reservoir model and three layers commingled production three composite reservoir model), study focused on the effect of composite radius and parameters such as permeability ratio of every composite on the sensitivity characteristics of the type curves of well test;(4) Double medium reservoir porous flow model of multilayer commingled production(N-layer commingling model without interlayer channeling, double-layer commingling model with interzonal crossflow, three-layer commingling model with interzonal crossflow. four-layer commingling model with interzonal crossflow). study focused on the effect of interzonal crossflow coefficient of the matrix to crack and parameters such as crack storage ratio on the sensitivity characteristics of the type curves:(5) Triple media reservoir porous flow model of multilayer commingled production (double-layer, three-layer and four-layer commingling model with interlayer channeling and N-layer commingling model without interzonal crossflow). Finally, useful reservoir parameters were gained through the interpretations of field cases of different oil and gas reservoirs.The research finding has been developed into professional well test interpretation software that has been used widely in the field, which serves the production and development of oil and gas field. Research results can also provide reference and guidance for the theory and application research of multilayer reservoir commingling porous flow at home and abroad.