Research And Test On Water Flooding Converting To Steam Flooding In Tan 91 Block

Fuyu oilfield exploration 91 block oil viscosity is relatively high,the viscosity of crude oil reservoir conditions for50-100mPa.s,water injection development for more than 30 years,the development of the block in high water cut,low recovery and development stage,the recovery is 13%,rate of oil production of 0.3%,water content 95%,and water cut rise faster.year increase about 1%.water flooding pattern prediction of low recovery rate,to water flooding development potential is not great,explore new development way to further improve the effect of block development is becoming a new research task.This article from the domestic and foreign data to start,using physical simulation method for water flooding reservoirs to improve recovery mechanism of steam injection development;enhance oil displacement efficiency,improving the mechanism of steam swept volume,clear the use the steam override properties,can effectively use the positive rhythm thick oil reservoir water flooding reservoir with poorer parts of the upper and the thin and poor reservoir;and the use of steam foam profile control,steam foam flooding can be effectively controlled after water flooding reservoir forming in the big pore path fingering phenomenon,reduce the secondary water to inject steam heat consumption,and can obtain a higher recovery rate.Based on the91 exploration areas of 3D geological modeling and dynamic production history match,remaining oil distribution of block,the main factors to control the residual oil by fracture water channeling and dual control of the remaining oil;the longitudinal properties and interlayer shielding longitudinal residual oil development by steam injection;therefore in the process of adjustment,increase the injection medium swept volume,effective use of now use weak or difficult to use the remaining oil,so that the steam injection development adjustment to obtain remarkable result.Numerical study on the 91 block by steam injection development after water flooding well spacing,injection-production parameters,development patterns are optimized,determine the feasibility of steam injection development.The design of reservoir engineering achievements on the91 block of steam injection development experimental deployment,according to the diamond shaped inverted nine injection-production well pattern deployment of 9test well group,and on the development index and economy undertook forecasting,from look on the index of 91 blocks of steam injection development after water flooding to improve oil recovery potential of the larger.Focus on exploration 91 water flooding after steam stimulation effects of follow-up evaluation,summed up the steam huff and puff effect,production rule and the influence of the main factors.Through this research identified 91 exploration blocks of steam injection development after water flooding to improve recovery rate is feasible.