APPLICATION OF POLYMER FLOODING TECHNOLOGY IN LOW PERMEABILITY OILFIELD DEVELOPMENT: A CASE STUDY.

In traditional polymer flooding technology, the flooding effect is affected by mechanical degradation, adsorption, dilution of polymer molecules during formation, and injection concentration variations. In the application of polymer flooding technology, how to optimize the polymer type and injection parameters to improve the oil displacement effect is very important. This paper conducts simulation experiments on polymer type, injection concentration, injection volume, etc., and evaluates the advantages of two polymers for flooding through the recovery factor and injection pressure. Studies have shown that when the concentration of ordinary intermediate polymer solution is 1200 mg/L and the concentration of salt-resistant polymer solution is 700 mg/L, the oil displacement effect for X low permeability reservoir is the most obvious. When the injection volume of two polymer solutions is 0.64 PV, the two polymers have the best increase in oil recover. When natural cores are used to study the oil displacement effect, salt-tolerant polymer floods the enhanced oil recovery value to 13.32%, which is higher 10.1% than that of ordinary middle-separation polymerization. Moreover, considering the polymer flooding effect and input cost, the pollution-distributed dilute salt-resistant polymer solution is used for flooding. The optimal injection concentration of the salt-resistant polymer solution is 700 mg/L and the optimal injection volume is 0.64 PV. [ABSTRACT FROM AUTHOR]