Effect Evaluation Of Water Injection Development In Low Abundance Low Permeability And Low Pressure Reservoir

Nowadays,most low-permeability reservoirs in China are developed by means of water injection,but there are few studies on the evaluation methods of water injection development in low permeability shallow sandstone reservoirs.In order to study the evaluation method of water injection development effect of this kind of reservoir,this paper takes the Chang 3sandstone reservoir in Weibei Oilfield of Ordos Basin as the research object.Firstly,injection dynamic development is analyzed based on the features of reservoir geology,development and production.Secondly,Application of reservoir engineering method to evaluate the development effect of water consumption,comprehensive water content,water use utilization rate,water injection volume,reserve utilization degree,reserve control degree and reservoir water absorption capacity.Lastly,The optimization scheme of injection and production parameters is put forward through the adaptability analysis of well pattern.The results show that the water injection development of Chang 3 reservoir in Weibei Oilfield is poor for the flowing reason:(1)Difference of oil-water mobility ratio of Peripheral area and 30,000 tons area is large and using the same well pattern will lead to the poor coupling of injection-production spacing and physical.(2)In the horizontal well area,the well pattern is not perfect and the formation pressure is decreasing dramatically.(3)The water pressure areas of which oil-water mobility ratio is relatively small rise faster to form a flooding wells due to interbed crack opening.(4)Great Interlayer heterogeneity,communication of artificial cracks and natural fractures,low flood conformance.Therefore,the similar reservoir development process should be based on reservoir physical zoning using different injection and production well,and we should be focus on advance water injection and maintaining the formation of the main pressure.It is of great theoretical significance to evaluate the development of water injection in shallow low permeability sandstone reservoirs.