Generally the hydrocarbon recovery factor and the complexity of the recovery mechanism are directly related. With the maturation of a producing field, enhanced monitoring plans and the implementation of fit-for-purpose data analyses workflows become necessary to understand well and reservoir dynamics for adequate reservoir management decisions. However, in reality, shifting the paradigm to adopt appropriate work strategies can, in certain circumstances, be restrained by several factors, including organizational issues.
In this paper, the risk of implementing simplified reservoir management practices in a complex carbonate field is evaluated. An extensive study carried out in a thin oil-rim carbonate reservoir which undergoes substantial gas and water injection in its huge gas cap and aquifer respectively. The objective of the study is to review the use of conventional lift curves i.e., oil rate – well head pressure cross plot, to:
Predict well performance changes under varying production conditions.
Accurately allocate daily well production.
It is found that the use of a simplified approach for well performance analyses and production allocation may not be representative in this particular case. The potential risks of using simplified approach are identified and the need of adopting sophisticated processes, to carry out appropriate modelling for representative results, are also discussed in this work.
This study conceptually demonstrates that a fully integrated reservoir/well/network coupled model is required to accurately address such cases. An integrated approach would not only benefit better understanding of well and reservoir behavior, but it would also aid meaningful decisions for establishing reservoir management best practices and strategies.