Physical Simulation Study On Water Injection Development Law Of Fracture-cavity Carbonate Reservoirs In 6-7 Area Of ??Tahe

With the continuous development of petroleum exploration on deep marine strata, an increasing number of fractured-vuggy carbonate reservoirs have been discovered, which will greatly facilitate oil and gas recovery. The block 6-7 is the main waterflooded reservoir of Tahe oilfield. The reservoir of this block has a various features, such as complicated reservoir space extremely heterogeneity of reservoirs. Water injection has achieved some effects but not significant in Tahe block 6-7. And, ultimately the law of water injection is unclear.For the purpose of make the law of water injection out, similarity criteria have been built, through equation analysis method and dimension analysis method respectively. Fellow the guide of similarity criteria six models have been manufactured. Using above models, the law of water injection has been studied, through experiment and numerical simulation. By research the following conclusions have been drawn:(1) Build up similarity criteria.33 criteria have been built, through equation analysis method and dimension analysis method respectively.4 criteria have been picked up, which have clear physical significance.(2) Complete model production, which based on similarity criteria and seismic data. According to the type of reservoir small-scaled have been made. Injection-production well group have made by face extrude and surface fitting.(3) The law of water injection has been studied, through numerical simulation and physics experiment, includes the influence of injection rate and injection-production relationship and the intensity of bottom water. The results show that:the oil production decreased with increasing injection velocity, in pure oil production stage. The law of oil production in oil-water production stage just opposite to pure oil production stage's. The faster the speed, the greater the water cut increased and the slower decrease of oil production rate. Different injection-production relationships show that:high injection and high production's cumulative oil production> low injection and high production's cumulative oil production> high injection and low production's cumulative oil production. The rising speed of water cut decreased with increasing cumulative oil production. Fracture injection and vuggy production is better than vuggy injection and fracture production.The bigger of the bottom water's speed, the bigger cumulative oil production and oil production rate and water cut rising speed is.