Optimization Of Injection Production Parameters For High-cycle Steam Huff And Puff In Y Block Heavy Oil Reservoir

Block y of L oilfield belongs to shallow super heavy oil compound anticline reservoir.After decades of thermal development,there are growing more and more production problems.For example,the water cut of huff and puff wells near the edge water area increases due to the high advance of edge water,and the development effect becomes worse due to the uneven production of vertical and horizontal oil layers.After high-cycle huff and puff in block y,the remaining oil in the area near the edge water gradually advances to the area far away from the edge water,and the overall distribution of the remaining oil is uneven.It is urgent to take measures to stabilize the oil and control water in the low part of the block,and excavate the potential in the high part.Petrel Re geological modeling software and CMG numerical simulation software were applied in the preparation of 3d fine geological model and reservoir numerical model respectively for the target layer in Block Y,and the reserves were fitted.During the fitting process,the model parameters were constantly modified.The residual oil is classified based on the historical production dynamic fitting of the whole region and a single well,and the distribution type and its origin are analyzed.Combining with reservoir geological factors and development factors,the order of the influence degree of the main controlling factors of the remaining oil distribution was determined by orthogonal optimization experiment.Combined with the development status of Block Y and the main controlling factors of the remaining oil distribution,the applicability of the current development plan was evaluated and the periodic production decline law of the whole region and single well was analyzed.In view of the phenomena such as lower output,lower oil-gas ratio and high water cut after high-cycle of huff and puff in the whole block,it is necessary to combine the production dynamics,production parameters and geological factors of huff and puff well,and analyze the reasons for poor efficiency of high-cycle steam huff and puff.After optimizing the production cycle of the high-cycle steam huff and puff well,the production well was subdivided and gradually optimized.After optimizing the steam huff and puff injection-production parameters and nitrogen injection-production parameters respectively,the optimal optimization scheme and results were obtained comprehensively.The results show that the adaptability evaluation of heavy oil reservoir development is the best preliminary work to improve the recovery efficiency of shallow heavy oil reservoir economically and effectively;the development significance and effect of parameter optimization for different types of wells in different periods are demonstrated by making full use of the existing well conditions and starting from improving the single well productivity and oil steam ratio in the later period of steam stimulation,comprehensive recovery degree increased by 3.32% after optimization,the effect of enhanced oil recovery is obvious.The results can be used in reference to the later development of heavy oil reservoir.