Study On Injection And Production Well Location Optimization For Fracture-vuggy Reservoir

At present,the development of oil and gas resources in China is becoming more and more difficult,and the development direction is also changing from the traditional clastic reservoir to the carbonate reservoir,in which the fracture-vuggy reservoir has become an important replacement field for oil and gas accumulation.In the middle and later period of production and exploitation,this kind of reservoir will generally face the problem of imperfect well location.In addition,the fracture cave reservoir is different from the traditional clastic rock reservoir,which has strong heterogeneity and does not conform to Darcy’s seepage law.Therefore,the traditional injection and production well location optimization measures cannot effectively solve the problem of imperfect well location in this kind of reservoir.In this paper,the reservoir numerical simulation method is used to study the injection and production well location optimization for fracture cave reservoir.The following operations are carried out: the conceptual model of typical fracture cave reservoir is established to study the influence of different cave size,number of caves,vertical and horizontal ratio of caves on cumulative oil production,water cut,oil recovery and remaining oil.Different reservoir geological models are established to study the water drive effect of different reservoir types,the optimization of vertical injection production structure,and the optimization of well reservoir matching relationship are studied.The geological model of block S74 in Ta He is established and fitted with history.On this basis,the remaining oil distribution,injection and production well location optimization design and effect prediction in block S74 are studied.The results show that the larger the cavern is and the larger the aspect ratio is,the more cumulative oil production will be.The water cut will be reduced and the recovery factor will be lower.With the increase of the number of caverns,the change of cumulative oil production and water cut will be smaller,but the recovery ratio will be lower.Low injection and high production is better than high injection and high production;fracture injection and hole production is better than hole injection and fracture production,fracture injection and cavern production is better than cavern injection and fracture production,hole injection and cavern production is better than cavern injection and hole production;water drive effect of single large karst cave reservoir is the best,fracture and karst cave reservoir is the second,fracture and hole reservoir water drive effect is the worst.The remaining oil in S74 block is mainly distributed between injection and production wells,the edge of the reservoir and the top of the reservoir.Close the lower perforation interval of TK6100 production well in single karst cave well group and reperforate the upper one,Periodic water injection for TK612 of fracture and cave well group,The new water injection well TK617 CH of fracture and hole well group can achieve better stimulation effect.