The Research Of Early Polymer Flooding Technical In Offshore Oil Field

The development strategy of offshore oil field is limited by the investment risk and the limitation of the platform.In order to achieve high speed and high efficiency development,the early polymer injection is a feasible development strategy.Research on the reservoir conditions and technical parameters in the early stage of polymer injection development can guide the development of the adjustment work of the oil field and the development policy of the newly developed oil field.In this paper,taking the large 10-1 oilfield as an example,based on the development of early polymer flooding in offshore oilfield,the dynamic analysis of the development of ten years of large oil field has been developed.At the same time,residual oil distribution,reservoir thickness,porosity,permeability variation coefficient,formation oil viscosity,optimum distribution pattern,reasonable density of well pattern,reasonable production fluid velocity,and other specific development parameters of oil field were studied Finally,we hope that this study have some reference value for the early development of polymer injection.The results of the study indicate that early after polymer flooding,the remaining oil is mainly distributed in the lower reservoir interlayer development region and the top of the injection production well pattern control area,the future of tapping the potential of remaining oil need to move in this direction.The study is suitable for early polymer flooding parameters to get the boundary: the thickness of reservoir is less than 30 m,the positive rhythm formation is less than 15 m,the porosity is less than 0.24,the permeability coefficient of variation is 0.64~0.75,the viscosity is less than 90mPa·s.The staggered pattern is nine point,five point pattern is more suitable for the early polymer flooding oilfield.In economic optimization as the goal,research a method to determine the reasonable well spacing density,fluid velocity.