Study On The Development And Adjustment Of Hydrodynamics In The High Water Cut Stage Of Xianhe Fault Block Reservoir

XianHe fault-block oilfiled have the feature of cracked geological structure.many vertical thin layer,obvious lateral alternation,complex relationship between oil and water and serious longitudinal and the plane heterogeneity.Over the years many programs have been implemented in main fault block reservoirs such as strata series subdividing.But by the influence of geological conditions,well pattern and well spacing,fluid properties and other factors,the waterflood effect is still unbalanced in fault-block oilfield.In order to obtain higher economic benefits,it is very important to choose low cost and high performance price ratio development mode in the case of low oil prices.In order to select the appropriate development method,it is necessary to evaluate the economic benefits of different development adjustment measures and establish different measures to adjust the balance oil price.In this paper,we use the method of theoretical analysis and numerical simulation of typical models,combined with reservoir development and economic evaluation to design programs of the fault-block reservoir.Establish balanced oil prices for different development measures.Analysis of low-cost development of technical mechanisms.The main results of the fault-block oilfield are as follows: determine the boundaries of layers recombination and economic evaluation in high water cut stage and the economic evaluation,analysis the enhanced oil recovery mechanism by hydrodynamic method and economic evaluation.The economic evaluation of the effect of hydrodynamic development is carried out by taking the actual block as an example.According to the economic performance,the best development plan is symmetrical injection-production coupling for He68 well group.Theequilibrium price is 46 dollars/barrel when the injection production ratio is 0.8 and the injection and production coupling cycle is a month.the cycling water flooding,injection-production coupling and cyclic production can gain good effects for Liang 13-27 well group,while the effect of cyclic production decreased significantly in later stage.The economic performance of injection-production coupling is best.For He50 fault-block well group,both alternate oil producing and alternate water injecting can improve the development effect of reservoirs,the equilibrium price is 44 dollars barrel.While for the alternate oil producing program,the cumulative oil production is the most and the effect of water cut reduce is best.