Research Of The Technology In Enhanced Oil Recovery By Artificial Water Drive In Edge And Bottom Water Reservoir In Linpan Oil-field

The linpanl3-9 block is a typical complicated fault block,and the main reservoir is the sub segment of ES2. Because of the prominent contradictions in layers, high heterogeneous, serious decline of the reservoir energy, complicate relationship between oil and water and unclear distribution of the remaining oil,The main purpose of the study is figuring out the distribution of remaining oil.The south block of ES2 of Lin13-9 is our experimental unit,reserves is 470×104t.The first operation is in June 2007,and thear are 24 oil-wells producting in June 2013 from June 2007, Daily oil is 37t/d, comprehensive water cut rate is 96.5%,oil recovery rate is 0.29%,cumulative oil production is 131.5×104t, recovery percent of reserves is 28.0%. According to the characteristics of this block,3-D geological modeling and reservoir numerical simulation methods are used to illustrate the distribution of the remaining oil.1. The modeling process and research results.The delicate 3-D geological model consists mainly of the model of three-dimensional structure, property model (porosity, permeability, saturation model), calculation of reserves.(1)According to the delicate comparison and division between each layer based on the cycle of sedimentary, we build the structure model.(2)Lithofacies model is set up with Truncated Gaussian simulation and Kriging interpolation, porosity and permeability model are set up with Kriging interpolation and water saturation model is set up with Kriging interpolation and Assignment method.(3)The model test with histogram analysis method shows the difference is small between simulation results of reservoir parameters and the actual interpretation,the model is available. (4) The model reserves of ES2 of Linl3-9 block calculated by grid is 261.18 X 104t,and actual reserves is 258.80× 104t, Deviation between them is 0.92,so we think the model is realistic in Reservoir geology.2. Numerical reservoir simulation and remaining oil distributionThe research work consisted primarily of numerical simulation model establishment and selection, production history matching and analysis of situation of remaining oil.The model is a black oil model simulated by Eclipse,The step length is 20m both in I direction and J direction, There are 42 grids in the I direction,29 grids in the J direction and 93 layers in Z direction, the total number of nodes is 113274.we choose July 1973 to May 2014 as history matching duration,the step length is a month,the last error is 0.67%,and the liquid production is unchanged during the history matching, single well matchs 82%.The remaining oil on the plane are mainly in where well net is imperfect and where nearby the high position of the structure, fault and Micro structure. The interlayer remaining oil are spread across 2-5+6,2-7、3-2、3-4、4-2、4-3.4-4+5、4-6+7、4-8. 4-12、4-13、5-2.The inner-layer remaining oil mainly found in layers with poor property.