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In this paper, the matrix for evaluating feasible concepts for oil rim development has been redefined to provide a stronger basis for selecting development options for oil rim reservoirs. The development matrix proposed in this paper incorporates three additional reservoir parameters that strongly influence the oil recovery factor: horizontal permeability, reservoir dip, and oil viscosity. The effect of reservoir energy balance on the selection of development options for oil rim reservoirs is further captured by including the reservoir’s water drive in the form of the dimensionless water influx. Relevant rock and fluid data were obtained from published studies on clastic and carbonate environments. Improvements to the oil rim development matrix are made based on parametric reservoir simulation studies to establish the correlation between oil recovery and the dominant parameters for conventional and concurrent oil and gas production. The results from box-type simulation models were compared with history-matched reservoirs for validity. The application of the improved matrix was demonstrated by comparing model-based recovery factors to recovery efficiencies from mature reservoirs with oil rims and initial gas caps. Developing oil rims 10 ft or less should only be considered using opportunistic completions in high permeability, low dip reservoirs with gas–oil ratio constraints. However, gas-only developments are recommended for these ultra-thin oil rim cases. Adopting concurrent production from both the oil rim and the gas cap is quite sensitive to the reservoir dip when the gas cap offtake is limited to 10% of the initial gas in place per annum, and the oil viscosity exceeds 1 cp. This development scheme is recommended when the reservoir thickness exceeds 50 ft, the reservoir dip is less than 3°, horizontal permeability exceeds 1500 md, and the ratio of gas to oil pore volume exceeds one; otherwise, conventional sequential oil and gas development should be adopted. The improved matrix presented in this paper provides a robust qualitative basis for screening oil rim and gas cap systems with due consideration to several key subsurface and operational parameters.

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An Improved Matrix for Selecting Oil Rim Development Options When Gas Production is a Priority

  • 会议论文

  • 发表日期：

    2025年

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  • Olugbenga Olamigoke,
  • Sunday Isehunwa

摘要

In this paper, the matrix for evaluating feasible concepts for oil rim development has been redefined to provide a stronger basis for selecting development options for oil rim reservoirs. The development matrix proposed in this paper incorporates three additional reservoir parameters that strongly influence the oil recovery factor: horizontal permeability, reservoir dip, and oil viscosity. The effect of reservoir energy balance on the selection of development options for oil rim reservoirs is further captured by including the reservoir’s water drive in the form of the dimensionless water influx. Relevant rock and fluid data were obtained from published studies on clastic and carbonate environments. Improvements to the oil rim development matrix are made based on parametric reservoir simulation studies to establish the correlation between oil recovery and the dominant parameters for conventional and concurrent oil and gas production. The results from box-type simulation models were compared with history-matched reservoirs for validity. The application of the improved matrix was demonstrated by comparing model-based recovery factors to recovery efficiencies from mature reservoirs with oil rims and initial gas caps. Developing oil rims 10 ft or less should only be considered using opportunistic completions in high permeability, low dip reservoirs with gas–oil ratio constraints. However, gas-only developments are recommended for these ultra-thin oil rim cases. Adopting concurrent production from both the oil rim and the gas cap is quite sensitive to the reservoir dip when the gas cap offtake is limited to 10% of the initial gas in place per annum, and the oil viscosity exceeds 1 cp. This development scheme is recommended when the reservoir thickness exceeds 50 ft, the reservoir dip is less than 3°, horizontal permeability exceeds 1500 md, and the ratio of gas to oil pore volume exceeds one; otherwise, conventional sequential oil and gas development should be adopted. The improved matrix presented in this paper provides a robust qualitative basis for screening oil rim and gas cap systems with due consideration to several key subsurface and operational parameters.