Adjustments And Researches On Polymer-flooding Well Pattern Thickening In Pâ…°oil Layer In East Block Of The Eastern Northâ…±region In Saertu Oilfield

This paper analyzes and studies the feasibility of well pattern thickening in polymer-flooding block of the eastern Northâ… region during the middle period of polymer injection. Also, it makes systematic analysis about its effects. It makes clarifications on feasibility, analysis and studies about the regional effect diversity from many views, such as oil layer development, reserve features, well pattern allocation and well spacing fixity. Therefore, the adjustment principle on individual schemes subject to different blocks is confirmed. Besides, it achieves the preferable effects of polymer flooding development.The east block of the eastern Northâ… region is the second industrial polymer-flooding block in the east of the pure oil zone. It is also the first block whose well pattern is thickened during the middle period of polymer injection in Daqing Oilfield Company. Researchers analyze the causes which are subject to the various problems existing in the development process of east block of the eastern Northâ… region. Moreover, the exploitation effects on high-concentration polymer-flooding are analyzed from many views, such as water content, injection pressure, reservoir pressure, injection profile and extraction profile. People work to find the effect diversity of adjusting different wells and make comprehensive analysis by the numerical simulation so as to learn the scheme-adapted conditions. In addition, to the exploitation contradictions, people take a series of measures such as well pattern thickening technology, individual adjustments to different regions and means which can increase the production and augment the injection of the water wells and oil wells. The thesis also makes the assessments about the overall and partition effects of the thickened-block. It provides the theoretical basis for the follow-up polymer flooding development of this block, such as choosing measures and adjusting the optimal index of injected wells. Also, it contributes the experiences to the other blocks which are going to be thickened in future.