Study on prediction method of minimum miscibility pressure in gas displacement

In recent years, an increasing effort has been put into the study of enhanced oil recovery (EOR) processes, especially miscible gas injection. A multiple-mixing-cell model is a discrete model of a continuous gas injection process in the slim tube experiment. A packed slim tube is discretized into a series of constant volume cells and the continuous gas injection is discretized into a series of constant batch volumes. In this approach, for n_c components, we find that there are n_c+1 constant-composition zones and n_c-1 key tie lines. Upon increasing the batch number of the injected gas, these key tie lines appear in a reverse order, i.e., the initial tie line appears first and the injection tie line appears last. Predicted results from this proposed approach are shown to be in excellent agreement with slim tube data and other slim tube simulators presented in the literature.