Refined Numerical Simulation Technology Research Based On Facies Controlled Modeling

With reservoir unevenly employed and highly scattered and locally enriched description of the remaining oil in the high water cut stage, the late oilfield exploitation is more and more difficult and it is rather hard to realize the stabilizing oil production and controlling water cut by conventional redevelopment technology. Now fine reservoir numerical simulation can't meet the demand for reservoir heterogeneity fined to microfacies and residual oil quantized to layers in high water cut period. In order to tap the remaining oil ultimately, it is necessary to develop existing oil-field fine reservoir description technology, fine numerical simulation method and adjusting tapping technology. In this paper,we achieve the fine numerical simulation based on facies-controlled model, put forward the fine water control and tapping method for high water cut stage of sandstone such as "extract, control, governance, subdivision and measured tone", and optimize the fine adjustment and tapping projects in high water cut stage in Duandong,Gaotaizi of Beiyi block and optimize the binary combination flooding injection projects in West block of Sazhong developing area. All of this provides important theoretical and technical support for oilfield to keep stable production. The main research results are as follows:We should ensure to choose the VIP-polymer software which has perfect flooding mechanism and can realize water flooding and polymer flooding integration simulation on the basis of comprehensive research of the percolation mechanism, physical and chemical phenomena about the mathematical model of water flooding and chemical flooding and related business software. This software can complete the water flooding and polymer flooding fine numerical simulation in high water cut period and achieves the binary compound system simulation of arbitrary alkali, surfactants, and polymer. And we precede the fine reservoir numerical simulation of binary combination flooding by the FACS whose physical-chemical parameters are available after water and polymer flooding.We have establish rivers-delta depositional microfacies recognition,the division standard and operation process,formed the fine recognition and description method which takes sub phase control, causes constraints, mode guiding, microfacies characterization as the core of these sedimentary sand and realized the relative permeability assignment to microfacies, test profile subdivided to unit and the remaining oil quantized to layers.Base on the 3D fine facies-controlled model of Duandong,Gaotaizi of Beiyi block, we carry out the fine numerical simulation research and confirm the potential types of all the sedimentary units. It indicates the remaining oil plane distribution of research area by water cut equivalent figure, remaining and moving oil proportion equivalent figure, recovery degree equivalent figure, oil saturation equivalent figure. It also indicates the longitudinal employing difference and the distribution of remaining oil of single well and group by applying the fine numerical simulation results such as water cut ratio in small layers, liquid production proportion, water suction proportion to establish auxiliary fluid production profile and water suction profile. It also indicates the difference about reserve producing degree and the total amount of remaining oil in each unit of development blocks.We put forward the fine water control methods mainly according to the following technology means such as:coping with the high shut-in well, casing collapse well and deficient well, perfecting the injection-production relation, subdividing the injection wells and trimming to improve the employing condition, supporting to implement the "extract, control" oil well measures. And we also optimize the fine adjustment and tapping projects in high water cut stage in Duandong,Gaotaizi of Beiyi block.We have established the facies controlled geological model in West block of Sazhong development area and the VIP numerical simulation software and FACS combinational flooding software are selected. Combined with monitoring data, we carry out the entire process of tracking and prediction for water flooding, polymer flooding and binary combination flooding in the study area. The remaining oil distribution is researched and the binary combination flooding scheme is optimized. The conclusions are as follows:polymer flooding pilot area increased 333,200 tons of crude oil, enhanced oil recovery rate of 11.82%. After polymer flooding, the reasonable control of chemical flooding are required to satisfy the conditions of interfacial tension 10-3mN/m and resistance coefficient≥3. In the binary combination flooding test area after polymer flooding, oil recovery rate and cumulative crude oil can be enhanced 5.96% and 16.48×104t. In the central well Area, recovery can be improved of 6.3%, and cumulative crude oil is increased 4.33×104t. Binary flooding is superior to the single polymer flooding in both technology and economy.This paper provides significant theory value and guiding significance for the further research of remaining oil tapped in the ultra-high water cut stage and after polymer flooding and the optimization of the binary combination flooding injection projects.