| Polymer flooding has been applied at Daqing and Shengli oilfield as a good method to improve recovery efficiency, and high economical effect has been achieved. The effect is different in all the polymer flooding blocks along with the polymer flooding scale being enlarged. Many influence factors affect the effect of polymer flooding, such as reservoir condition, injecting and producing parameter, injection occasion, development status, injecting program, technology design and the status of field applying, which is one aspect of affecting the polymer flooding effect. On the other hand, the applying effect is reduced when injecting because of some influence of low injection pressure wells, polymer solution and high pressure wells. This will cause low use factor of polymer, and can not attain the ideal effect about the polymer trial.The paper decribes four technologies to solve the existing questions during injecting, they are low pressure well attending crosslinker, composite channeling resistance, separated layer polymer-flooding and composite broken down technology. Every technology is researched in lab, and concluded the applying effect. Field applying showed that these technologies can improve polymer flooding effect, and reduce the risk of polymer flooding, and enhance economical benefit. |
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