Research On The Factors Of Development Index And Rules Of Polymer Flooding With Close Spacing

Most of the current block of Daqing oilfield has entered the stage of polymer flooding, polymer flooding has become an important way of keeping Daqing oilfield stable production. However, the effect of differences in the development of different types of wells, so in order to optimize the polymer flooding effect, we must study the impact of polymer flooding effect of polymer flooding development factors and laws, in order to guide reasonable oil production and to maximize economic benefits.In this paper, we used Eclipse software to simulate the development process of polymer flooding in Apricot M block, according to the statistics of production data,obtaining the change law of polymer flooding in block. At the same time, combined with the grey correlation theory, the factors that affect the development of polymer flooding are analyzed from three aspects, such as static factors, dynamic factors and injection factors.According to the analysis, draw conclusion as follows:(1) The main factors affecting the water content change of polymer flooding are the oil saturation, the amount of polymer, the degree of polymer flooding control and the permeability;(2)The reasonable well spacing of polymer flooding is 150 meters, the reasonable injection production ratio is 1, the reasonable injection rate is 0.2PV/a;(3) Polymer injection about 4 months, Block began to take effect, water content decreased about 7.17%, low value time about 13 months; after injecting polymer, block’s oil production and oil increment multiplier are rising, near water the minimum value when oil production and oil increment multiple reached maximum, subsequently, water began to return, then oil production and oil increment multiple have begun to decline;(4) After the polymer injection block’s optic absorption index began to decline, declining about 18.55%~43.32%;In the early stage of polymer flooding, the cumulative injection production ratio of polymer flooding is low, and the accumulation of water cut into the late stage of low value period, the cumulative injection production ratio is 1;The injection pressure of the block mainly raised during the period of decline and low value, when water content began to return, injection pressure tended to be stable.