Study On Well Pattern Reconstruction Scheme For Secondary Development Of H Reservoir

With the constantly development of waterflooding,quite a few oil fields in China have been in the stage of high water-cut.Under the condition that long-term waterflooding has led to the increase of reservoir nonhomogeneity and there is still a certain regularity in the remaining oil distribution,the original flood pattern and layers division cannot meet the current development needs.Hence,the optimization of both the well pattern and the strata in the high water cut stage matters a lot in promoting the efficiency of the oil field development.According to the issues of the unclear distribution of the oil and water of H reservoir,the imperfect well pattern,the increasing rise of the water,as well as the serious flooding in the upper part.This thesis,combined with quantities of data in drilling,logging and production dynamics,does research on the H reservoir development area to explore on the oil and gas layer identification.Besides it studies the characteristics of the remaining oil distribution in the block based on the geological modeling.Also,it explores the optimization of the layer system and the adjustment of the well pattern by employing the fuzzy clustering method,the reservoir engineering method and the reservoir numerical simulation method in the fuzzy mathematics.This thesis consequently develops the second well pattern reconstruction program,which is as follows:(1)By employing cross plot and overlay technique,the oil and gas reservoirs of H reservoirs are re-identified and the oil-gas interface is re-divided,which lays a foundation for the three-dimensional fine geological modeling of reservoirs.(2)Based on the knowledge of the date about the logging and geology,the three-dimensional geological model of block is established by facies controlled method and the geological model is tested by diluting.On this basis,a suitable reservoir simulation model is finally completed by coarsening.(3)The producing history matching for both regional wells and a single well is completed,base on which the research on the distribution rule is carried out.As a result,five kinds of control types of the remaining oil distribution are summarized,which provide the basis for further well pattern reconstruction.(4)Based on the parameters such as degree of reserve recovery,porosity,reservoir depth and remaining reserves abundance,the layer optimization study has been carried out,according to the fuzzy clustering analysis.(5)Five sets of adjustment schemes on follow-up development are designed for the remaining oil area and the re-combination layer,and the prediction research is carried out to determine the optimal adjustment scheme.According to the current results of the well adaptability analysis and the reasonable mining policy,this paper mainly researches on the well pattern reconstruction from the aspects of layer optimization and well pattern adjustment,aiming at solving the problems of the fast rise of the water-cut level in the H reservoir development area,the serious flooding of the upper main layer and the prominent contradiction between layers.Consequently,a reasonable adjustment plan has been worked out,which lays a foundation for the sustained and stable development of the reservoir.