An operator in Colombia retained Sproule to evaluate and optimize the conversion of five fields from cyclic steam stimulation (CSS) to continuous steam flood under various development scenarios and determine the most optimal development strategy including pilot designs per field.
Project Highlights
- Complex Reservoir
- Fully Integrated Field Development Study
- Simulation of Conversion to Continuous Steam Flooding
Challenge
- A client wanted to determine the feasibility of implementing continuous steam flood stimulation to increase oil recovery in five fields within a common regional area
- Analysis to establish economic viability to aid in the client’s decision to assume full ownership and operatorship of the fields at the expiry of their existing partner contract was needed
- The fields are large, multi-zoned, with complex geology. There are approximately one thousand wells and 20 individual reservoir units currently being developed with cyclic steam stimulation (CSS) through a variety of well configurations including vertical, deviated, and horizontal wells
Solution
- Sproule completed a one year fully integrated reservoir and field development study to help the client understand the remaining potential of the fields
- A representative static reservoir model encompassing all five fields and surrounding area was constructed by combining a structural interpretation based on 2D seismic with petrophysical evaluation and the conceptual geological interpretation in the study area.
- Sproule reservoir engineers determined the optimal development strategy for continuous steam flooding in each of the five fields, which involved integrating the static reservoir model into standalone dynamic sector reservoir models.
- The dynamic reservoir models were calibrated to available performance data. Pattern models were extracted from the sector models and used to determine viability and an optimal development plan.
Value
- Sproule’s technical and economic modelling allowed the client to understand the remaining potential of the fields if developed with steam flooding. This aided them in their decision process regarding assuming full ownership and operatorship of the fields when the current contract expires.
- Key reservoir risks for well performance were identified. Various economics scenarios were completed to indicate which sectors had positive Net Present Value (NPV) for a full field continuous steam flooding operation
- A pilot model was recommended to evaluate and optimize the conversion of the fields from cyclic steam stimulation (CSS) to continuous steam flood under various development scenarios.
Managing Director, Reservoir Services
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