Reservoir Exploitation Rule And Parameter Optimization Of SP Flooding In Conglomerate Reservoir

The conglomerate oil reservoir is an important part of our energy structure,such as Xinjiang contains a large area of the conglomerate oil reservoir.Because the conglomerate reservoir has complex rock skeleton particles,the grain size is very uneven,resulting in the reservoir pore structure complex,pore scale difference,showing extremely heterogeneous characteristics.Therefore,it has become an inevitable trend to implement polymer flooding and polymer/surface flooding technology to improve oil recovery in conglomerate reservoir.It is of great guiding significance for the efficient development of conglomerate reservoir to clarify the production rule of remaining oil in conglomerate reservoir and the compatibility between polymer flooding and polymer/surface flooding..This paper is the applied in polymer and surfactant for the optimization of conglomerate reservoir,and to gather/table oil displacement effect of binary system of the evaluation of the system,and the obtained optimum surfactant for CEDA peptide often alcohol amine,the compound with the polymer H-12 as chemical flooding the binary system of viscosity and reduce the effect of oil-water interfacial tension is best.After that,indoor oil displacement efficiency evaluation and injection and production parameter optimization experiment of conglomerate core were carried out,and it was concluded that the best injection rate was0.2m L/min for both polymer flooding and binary composite flooding stages.The pore throat size of conglomerate core and the distribution law of remaining oil and the characteristics of remaining oil production under different modes were obtained by NMR and CT scanning.Model of conglomerate through three core displacement experiment found that the dual mode and complex mode conglomerate cores of polymer displacement and binary displacement effect is better than the singlemode core,and the core mercury injection pore size analysis and comparison of oil displacement experiment research,the application of poly table 2 yuan for conglomerate reservoirs system during oil displacement,not the higher the permeability of the core,the better,It is that there is an optimal permeability interval.By measuring the polymer molecular pellet size and corepore radius,it can be seen that with the increase of the ratio of "median pore radius/polymer molecular pellet size(Dh)",the increase of recovery efficiency of binary composite flooding increases first and then decreases.When the ratio of "median pore radius/polymer molecular coil size(Dh)" is in the range of 10～15,the yield of binary composite flooding in EOR is greater.Finally,through the numerical simulation method,the related parameters in the polysurface binary system experiment are simulated to study the effect of oil flooding in conglomerate reservoir to improve oil recovery.It is found that the simulation results are consistent with the experimental conclusion,indicating that the conclusion of the oil flooding experiment is more credible.