| S field H oil group has been developed more than30years, and production difficult isbigger and bigger. According to the problems that we will fact in the extra high water cutperiod of water flooding process in S oilfield, we mainly research on the following aspects:With natural cores, he experimental study the influence of different permeability, differentinjection rate and different total injection volume on the displacement characteristics. Theresults show: under high multiples injecting water and the same injection rate. With theincrease of the permeability, the ncrease of recovery ratio is increasing. But, the recovery ratiowith larger permeability will be higher, and injection pressure and permeability are inverselyproportional relationship; Under high multiples injecting water and the same permeability.With the increase of injection rate, recovery ratio is increased gradually, and injectionpressure and injection rate are direct ratio relationship. When injection rate is bigger, recoveryratio is very close.With artificial heterogeneous cores,the experimental study the relationship of multipleinjection,injection rate and heterogeneity. The results show: under high multiples injectingwater,although the moisture is very high, the cumulative oil production is still considerable;permeability ratio have a great impact on low-permeability layer; improving multipleinjection and the injection rate,the ultimate recovery of laboratory experiments can beincreased.With the results and data of the experiment, We establish the theoretical equation of totalinjection volume and recovery ratio, and the theoretical equation of injection rate andrecovery ratio. The results show: The recovery ratio and the total injection volume arelogarithmic relationship, and the relative error is less than10%. The recovery ratio andinjection rate are a linear relationship. and the relative error is less than5%. The theoreticalequation can guide the oilfield wiht high total injection volume water flooding. |
PDF Full Text Request