Complex Well Modeling Workflow Enabling Full Field Optimization and Forward Decisions

Abstract

Abstract The application of Complex Wells (CW) as a component of an optimized field development strategy at single well, sector model and or small scale multi-well level is generally well understood. In contrast, the application, modeling and optimization of a full field strategy inclusive of CW remains a daunting industry challenge. This paper describes a highly successful four-step workflow to manage, assess and model the qualification of a CW optimization strategy at a full field model scale. The paper utilizes a field case to illuminate a CW field wide optimization – extended production plateau, increased production rates and CW completion strategies – approach as compared to single, sector and or multi-well level CW model derived field development decisions. In this paper, complex wells include; Multi-laterals (ML) and Maximum Reservoir Contact wells (MRC) inclusive of down-hole Internal Control Devices (ICD), Equalizers (ICD or equalizers) and or Internal Control Valves (ICV). The workflow starts with reservoir understanding and identifying the need for CW. A sector model is then extracted from the full field model to conduct detailed well level analysis. This is followed by defining well sensitivity cases, that may include a range of field development decision scenarios and a resultant optimization strategy that recommends a combined conventional and CW field optimization approach. From sensitivity cases, the best fit well(s) case scenario is identified. Thereafter, the optimized well(s) strategy is applied to the full field model and evaluated under uncertainty. Detailed analysis is conducted on both the sector and full field models including well location, orientation, placement, length, and target zones for various CW configurations. The resultant development strategy is an optimized full field CW development decision approach including for example; improved sweep efficiency, delayed water breakthrough, improved oil recovery, reduced water handling expense, reduced produced water, extended oil plateau duration and reduced environmental impact.