Abstract:

Optimal parameters of polymer flooding are the key in working out development plans, which determines the effects of polymer flooding. Sensitive parameters are presented which affect the effects of polymer flooding in the Ⅳ series of bottom strata of Shuanghe Oilfield. The sensitive parameters are density of polymer, amount of polymer slug, injecting rate and injectionproduction ratio respectively. Orthogonal test is carried out based on the principle of orthogonal design, involving the four factors and three corresponding levels. Optimal level of the parameters is achieved on the objectives of incremental recovery, cumulative production increment and integrative index. With the methodology, the numbers of tests has been greatly reduced while the scientific results ensured effectively. Then the optimal form of slug group is presented on the objectives of incremental recovery and net present value using reservoir numerical simulation method based on optimal level of the parameters above. These results will provide scientific support to the developing practice of the Ⅳ series of bottom strata of Shuanghe Oilfield.

Key words: polymer flooding, orthogonal test, numerical simulation, optimal parameter, net present value, enhanced oil recovery