Analysis Of Water Flooding Characteristics Of Oil Reservoir In Block L And Study On Supplementary Encryption Adjustment Scheme

Block L was developed by water injection with 300 × 300 m anti nine point area well pattern in 1997,and the overall infilling adjustment was carried out in 2007.At present,it has entered the stage of high water cut development.The current well pattern faces the problems of serious water flooding in the main layer,low oil production speed,poor development effect year by year,low control degree of water drive in the main layer,poor adaptability of well pattern and so on.The potential of adjustment and measures is small,and it is difficult to effectively control the rise of water cut Larger.It is urgent to carry out the comprehensive evaluation of water flooded layer,implement the distribution characteristics of remaining oil and study the supplementary infilling adjustment scheme.So as to improve the effect of oilfield development,improve the development efficiency and ultimate recovery.Firstly,according to the characteristics of sand body change,logging interpretation data and dynamic monitoring data after the completion of infill well drilling,this paper summarizes the logging response characteristics of homogeneous rhythmic reservoir,positive rhythmic reservoir and anti rhythmic reservoir in block L,corrects the watered out grade of infill well in block L with the method of combination of dynamic and static,provides guidance for the preparation of supplementary infill scheme.Then on the basis of reservoir numerical simulation research,the plan of movable remaining oil reserve abundance is obtained through calculation.Vertically,the distribution law of remaining oil reserves of different sedimentary units and different sedimentary facies is given through simulation and calculation.The remaining oil is divided into six types: plane interference Type,sand body edge type,interlayer interference type,with or without injection type,fault shielding type and water absorption difference type.The remaining recoverable reserves and the remaining proportion of different types of remaining oil are quantified.The results show that the main factors causing the poor development of block L are the difficulty of effective control of the remaining oil at the edge of the fault and the poor water injection effect of the water injection well.According to the distribution law and development characteristics of the remaining oil in block L,three sets of different supplementary encryption adjustment schemes are determined based on the reasonable encryption adjustment boundary.According to the development effect comparison of each set of encryption schemes,the optimal encryption scheme in block L is determined as follows: the flexible encryption mode in the center of the well pattern and at the edge of the fault is the main way,and the old wells are used to improve the injection production well pattern.At the same time,taking advantage of the favorable opportunity of well pattern adjustment,implementing the corresponding treatment measures for oil and water wells,and improving the injection production relationship,the optimal scheme predicted the recovery factor of 34.64%,which was 2.18% higher than that of unencrypted.This paper can guide the development adjustment and medium and long-term development planning of similar oilfields in high water cut stage,control the decline of developed high water cut blocks,improve the development effect of oilfields,improve the development efficiency and ultimate recovery rate.