The impact of calibrating Todd and Longstaff's mixing parameter on optimising miscible finite sized slug wag injection

This paper presents the work of optimising the WAG ratio and slug size in miscible finite sized slug WAG (FSSWAG) injection on a field scale, considering the impact of Todd and Longstaff's mixing parameter (ω, also known as TLMIXPAR) value. This work is an extension of Al-Haboobi's (2019) work where Al-Haboobi showed there is a relationship between the value of ω with specific slug size and WAG ratio. This relationship was used in the optimisation of slug size and WAG ratio by updating ω (TLMIXPAR) in the Eclipse 100 data deck using a Python code. In order to identify the impact of the calibrated value of ω on the optimisation of miscible FSS WAG injection, the slug size, WAG ratio, type of fluid injected (so-called WAG pattern injection) and the flow rate were optimised. The optimisation scenario is performed with the assumption that there is an unlimited supply of gas to inject, what if the gas supply was finite (limited)? Therefore, the impact of the calibrated value of ω on the optimisation results has been investigated by adding the assumption that there is a limited amount of gas to inject for the optimisation of WAG ratio, slug size, WAG pattern injection and the amount of flow rate to inject. The results of the previous optimisation scenarios for the calibrated value of ω are compared with the results of the optimisation at a fixed value of ω=1 for both secondary and tertiary recovery. The full details of this work can be found in (Al-Haboobi, 2019).