tailieunhanh - Orr, F. M. - Theory of Gas Injection Processes Episode 13

Tham khảo tài liệu 'orr, f. m. - theory of gas injection processes episode 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . CALCULATION OF MMP AND MME 231 sequence of calculations 1. Mix a quantity of injection gas with the initial oil to make a mixture with an overall composition in the two-phase region that lies on the dilution line that connects the initial oil and injection gas compositions. This composition could be created physically by mixing the same quantities of oil and gas in a high pressure cell used to measure equilibrium phase compositions. 2. Calculate the equilibrium compositions of the liquid and vapor phases that form for the overall composition in the mixing cell using an equation of state and an appropriate set of parameters that describe the components in the mixture. 3. Mix the vapor phase that results from the previous contact with an additional quantity of original oil in quantities sufficient to make a new mixture in the two-phase region and calculate the resulting equilibrium vapor and liquid phase compositions. 4. Repeat the mixing of fresh oil with the equilibrium vapor until the compositions of the resulting liquid and vapor phases converge. When they do the liquid and vapor phase compositions will lie on the tie line that extends through the initial oil composition. This process of repeated mixing of an equilibrium vapor phase with fresh oil is sometimes called forward contacts. The injection gas tie line can be identified by a similar sequence of calculations in which the liquid phase that results from each mixing step is mixed with fresh injection gas sometimes called reverse contacts. This calculation converges to the liquid and vapor compositions that lie on the tie line that extends through the injection gas composition. Once the injection gas and initial oil tie lines have been identified by the mixing cell procedure the MMP or MME is calculated by changing the pressure or injection gas enrichment until the one of the key tie lines injection or initial oil has zero length. This procedure produces the correct MMP or MME for ternary systems but it