Research On Potential Tapping Measures Of Remaining Oil In The Middle And Late Stages Of Water Injection Development In P Reservoir

With the development and utilization of onshore oil and gas resources,offshore and deep-water oil and gas resources have gradually become an important direction for exploration and development in various countries.Turbidite sandstone reservoirs are an important type of deep-water reservoirs.high-speed water injection is generally adopted as the development method.In the middle and late stages of water injection development,the water content of production wells rises faster and the production decline rate is high,but the reservoir is still rich in potential value of remaining oil.It is urgent to be solved that distribution of remaining oil in the reservoir in the middle and late stages of water injection development and the corresponding potential tapping measures.Based on the investigation of relevant literature at home and abroad,this paper takes the first and second areas of the P reservoir as the research objectives.Firstly,combine static geological data and production performance data for analysis and research,clarifie the distribution characteristics of remaining oil in the study area,and determine heterogeneity characteristics in the study area.Secondly,combine the remaining oil distribution and heterogeneity characteristics of the study area,potential extraction measures of liquid extraction,gas-water alternation and nitrogen foam flooding are put forward and their respective applicability are analyzed from a theoretical level.On this basis,according to the principle of similarity,core materials are prepared and physical experiments corresponding to potential tapping measures are carried out,and the experimental results of each group are analyzed and compared.Finally,based on the results of physical experiments,a numerical simulation study of gas-water alternation at the core scale and nitrogen foam flooding is conducted,and the results of the physical experiments are mutually verified,confirming that the two measures are effective for the remaining oil utilization caused by planar heterogeneity in the existing reservoir model,the liquid extraction adjustment measures of the P reservoir area 1 were compared,and 1.2 times liquid extraction is selected as the final measure.The research results of this paper can provide strong theoretical and technical support for the actual production on site.