| Bottom water reservoirs occupy a large proportion in China’s oil reservoirs,and their reserves are quite abundant.However,with the deepening of development,the water cut of reservoirs that have entered the middle and late stages of development is constantly rising,and the reservoir heterogeneity.In fact,the remaining oil in reservoirs still has some value.The existing development policy can not fully meet the current development needs.Therefore,researches on late-period adjustment of reservoir development,especially for special reservoirs such as thin-bottomed reservoirs,play an important role in promoting the efficient development of thin-bottom reservoirs.In this paper,we choose the K1h27-5 high-permeability,thin sandstone bottom water reservoir in Luliang Oilfield in Xinjiang as the research object.The effect of K1h27-5 reservoir development was evaluated.It is concluded that the reservoirs of K1h27-5 are poorly developed with waterflooding,Some horizontal wells and other low yield issues.In view of these problems that need to be solved in the middle and later stages of reservoir development,the authors make extensive use of a large number of well logging interpretation data and other data,and apply the precise 3D geological modeling and numerical simulation techniques of reservoir to carry out geological,logging and reservoir engineering,numerical simulation and other multidisciplinary research,finely dissecting the lens bottom water reservoir to deepen understanding of reservoir distribution,and using the well logging interpretation data to verify the structural model,attribute model and water flooded layer,according to the requirements of the dynamic history of production fitting and simulation of flooding location,the thickness and the actual results on the basis of a good study of the remaining oil distribution law and the law of water flooding,the residual distribution law of the reservoir is obtained.Through the numerical simulation technique,the limits of technology policy of reservoir development are calculated,and the optimal fluid-volume ratio of reservoir with reasonable injection-production ratio and different effective thickness horizontal wells is obtained.Based on the actual characteristics and residual distribution of reservoirs.Through the comparison and analysis of the data of accumulated oil production,reservoir water cut-off rate and single-well-off oil production under different adjustment schemes,the comprehensive adjustment plan is determined as the optimal adjustment plan,and after the implementation of the plan.After 10 years of production,the accumulated oil production reached 32.38×104t and the cumulative increase was 4.62×104t.The water content reached 95.84%and the degree of reservoir recovery was 34.15%,4.87%higher than that of the basic plan.The technical ideas of this kind of reservoir development adjustment have been preliminarily obtained.Based on the systematic study of the Luliang K1h27-5 thin-bedded and bottom water reservoir,it provides a good theoretical and technical basis for the follow-up of the reservoir and provides technical support and theory for improving the development effect of the Luliang thin-bedded bottom water reservoir The foundation also laid the foundation for the researches on the adjustment and adjustment of similar reservoir development at home and abroad. |
