Applying the calibrated Todd and Longstaff's mixing parameter value for miscible slug size wag injection on field scale

This paper presents the application of the calibrated values of the Todd and Longstaff's mixing parameter, ω, for miscible finite-sized slug WAG (FSS WAG) injection on a field scale. This work is an extension of the work of calibrating the mixing parameter value (Al-Haboobi, 2019) where Al-Haboobi showed there is a relationship between the value of ω with specific slug size and WAG ratio. The application on a field scale was through the use of a black oil simulator, Eclipse E100, and was designed to show the reservoir performance obtained using the calibrated values of ω for 1:1 WAG ratio at different slug sizes. Also, to compare the reservoir performance at the calibrated value with a full mixing ω =1 and with Todd and Longstaff's value = . Todd and Longstaff recommended a value of to be applied on a field scale to take into account the effect of heterogeneity. However, the value of is used in this comparison, because this comparison was established in the original work of calibrating the mixing parameter value (Al-Haboobi, 2019). Two case studies were used to test the reservoir performance and the impact of the calibrated value of ω on the reservoir performance, a synthetic quarter five spot model and a semi-synthetic model (the Watt field model). The quarter five-spot model allowed the demonstration of some of the key features of FSS WAG injection in a 3D model without the additional complexity of multiple wells, horizontal producers, faults, and complex permeability and porosity distributions, such as those in the Watt field model. The paper begins by presenting the models under study, their fluid properties and the grid-refinement study conducted on both models. Then, the paper provides the assumptions of applying the calibrated value of ω on a field scale. Finally, it shows the results and the impact of the calibrated value of ω on the WAG zone and the oil recovery factor.