The Optimal Design Of Flooding Scheme Of Gao7Fault Block In Jiangsu Oilfield

After domestic and foreign oilfield water injection development ten years to decades, most fields have entered extra-high water cut period. Due to the presence of large pores and high permeability layers, making the water injected into the development of low water use, development ineffective. Therefore, how to improve the injection of water in the formation and wave to and improve the injection coefficient is extraordinarily important. Through domestic and international research shows that EOR technology by changing the flow of water injection, adjust the injection wells injection profile, reduce the injection water invalid cycle in hypertonic layer, start low permeability layer, improve sweep efficiency, so as to improve the effect of water flooding, enhance oil recovery. Before taking effective measures, oilfieldwill evaluate the development effect of water flooding, through the development potential analysis to decide whether to take such measures aswater plugging and profile control. And a lot of water flooding effect evaluation index, generally through the prediction of recoverable reserves, recovery rate to evaluate the oilfield development potential.In taking water plugging and profile control measures, first of all need to be screened flooding wells and layers. The need for flooding the wells,during the waterflood development, due to the interlayer and intralayer heterogeneity is serious, the injected water prior to entering into the high permeability layer, with water power erosion and fluid friction carrying, high permeability layer is scoured by more and more serious, more easy to form large pore. As for the injection well flow field and flow field strength, we can get the theory supporting them from streamline model. The basic idea of streamline simulation is to decompose the3D problem into a series of one-dimensional problems, fluid movement along the natural streamline grid, keep clear of displacing front and reduce grid orientation effects, improve the simulation speed and accuracy. Based on the flow line model, this paper mainly studies the gravity and capillary forces consideration of factors oil-water flow line model, and using a numerical method to solve it. Because of its high efficiency, the streamline simulation technology is more and more widely used in many fields.At present, there are a lot of types of blocking agents applied in water plugging and profile control technology. Among them, the use of cross-linked polymer flooding is more extensive. It is the organic combination of oil displacement and profile control, injected The polymer and crosslinking agent into the reservoir, so that they form a gel in strata blocking the high permeability layer, changing the injection water flow in reservoir, which initiates low permeability layer, adjusts injection wells injection profile, to improve water flooding effect. Gel polymer and crosslinking agent is mainly composed of two parts, the polymer used here is the largest polyacrylamide (HPAM). In this paper, the experiment involved profile control agent is chromium crosslinking system.Based on the analysis of basic data of Gao7block Jiangsu oilfield, combined with reservoir situation and development characteristics, evaluating the development effect of water flooding of Gao7block, predicting the recovery rate and the remaining recoverable reserves of water drive,in order to know the potential of oilfield development. Based on grid flow simulation technology and reservoir geological data, making full use of the oil wells static data and dynamic data production, using Rdosv software and dynamic reservoir information retrieval system to simulate the flow tube between layers of oil wells diagram, flow chart and residual oil distribution, Combined with the principle of well and layer selection, reservoir physical properties, interlayer contradiction, sedimentary facies, fault to analysis and optimize profile control wells and layer, combined with the results of numerical inversion physical model test,conformed that, when injected0.033PV drawn chrome crosslinking system,the best profile. Based on the results of numerical inversion physical model test, design the flooding program and the amount of gel per single-well, through the input-output ratio to get the optimal construction program.