| Today our country’s oil demand is growing steadily, but The people living on oilconsumption and the production of oil and gas is currently showing a decreasing trend on land,So the continuous growth of offshore oil production has played an important role in thegrowth and stabilization of national oil production. Chinese offshore oil and oil production aremainly located in the Bohai Bay, and its total reserves of heavy oil account for2/3or more.However, Because of the heavy oil reservoir with large reservoir thickness、The average highpermeability、Heterogeneity is strong、The characteristics of high viscosity of crude oil androck cemented loose, Water flooding development effect is poorer, the recovery water cut isonly about20%. Therefore, the efficient development of heavy in offshore oil field oil hasalways been a technical difficulty in petroleum science and technology workers.On the baseof extant research and its achievement, guided by reservoir engineering, by means ofnumerical simulation technique and taking NB35-2oilfield as research platform, research onnumerical simulation of “profile controlling and flooding and thermal recovery” combinationwas carried out. The development method adopted the combination of polymer-weak gelflooding and multiple thermal fluid throughput, which made use of the synergistic effect ofthem. Through the well injection of polymer gel, to adjust the suction profile and complementformation. And inject the multiple thermal fluid, reduce the viscosity of crude oil nearwellbore area, reduce filtrational resistance, improve the liquid producing capacity.Researches show that, Displacement effect of main influencing factors for well oil profilecontrolling and flooding are: concentration of polymer、 polymer slug size and floodingdisplacement time. Main factors influencing oil well thermal fluid stimulation effect are:thermal fluid velocity、soak time、thermal injection、Fluid temperature and fluid injectioncycle time. From the output or recovery growth and the comprehensive evaluation,“profilecontrolling and flooding and thermal recovery” combination recovery increased could reach7%~14%. combination development was obviously superior to single profile controlling andflooding or single thermal recovery, Even higher than the sum of the both. Results ofnumerical simulation showed that, B17well group single profile controlling and floodinginjection parameters optimization results: concentration of polymer、polymer slug size、“polymer：Cr3+” and flooding displacement time vaule is3000mg/L、0.06PV、180:1and12month. B28and B29in this well group thermal recovery parameters optimization results:thermal injection is4000m3、thermal fluid velocity is200m3/d、fluid temperature is280℃、dry degree is0.6、soak time is4d、thermal cycle injection is4000m3、and fluid injection cycletime is9month. Numerical simulation also shows that, B6、B20m and B3m well group“profile controlling and flooding and thermal recovery” parameters optimization results: B6well group thermal fluid velocity、soak time、thermal cycle injection、fluid temperature、fluid injection cycle time、concentration of polymer、polymer slug size、flooding displacement timeand production-injection ratio the best level are:150t/d、3d、3500t、275℃、18month、3000mg/L、0.04PV、6month and1.5.B20m well group the best level are:140t/d、3d、3500t、270℃、18month、3500mg/L、0.1PV、6month and1.5. B3m well group the best level are:150t/d、2d、4500t、270℃、9month、3000mg/L、0.1PV、15month and1.4. The constructionresults show that,“profile controlling and flooding and thermal recovery” had the effect of“increasing oil and decreasing water cut”, have been NB35-2oil field development importanttechnical measures. Through analyzing field construction and the results of numericalsimulation, Adjusted the geological model of some physical parameters, improved theprecision of the numerical simulation prediction. |
PDF Full Text Request