Production Enhancement Workflow Unlocks the Potential of Tight Carbonate Middle Marrat Reservoir, South Kuwait

Production enhancement from tight carbonate reservoirs is essential to reach Kuwait's oil production target by 2030. This paper will demonstrate an integrated workflow that includes advanced reservoir characterization to optimize the stimulation design with enhanced zonal coverage in a heterogenous Jurassic reservoir, Middle Marrat of South Kuwait. It is crucial to accurately select the candidates based on precise determination of the reservoir permeability contrast across the different layers. Representative fluid samples have been captured to map the asphaltene envelope. The injection logging survey was a key input to determine the permeability profile and to evaluate the integrity of the patchy cement through temperature analysis. Pressure Transient Analysis (PTA) were essential to evaluate the significance of the depletion across the different areas of the field as well as to determine the total skin of the reservoir. The integration of these data in a structured workflow enhanced the stimulation design. Based on the significant permeability contrast, Single-Phase Retarded Acid System (SPRAS) and Degradable Diverter System (DDS) were found to be essential to unlock the tighter layers. Five wells were stimulated utilizing the above workflow resulting in 7 folds of increase in the oil production versus 4 folds of increase before implementing this workflow. Another important observation is the sustainability of these wells for over 1 year with less frequency in asphaltene clean-out treatments. It can be observed that meticulous characterization, planning and execution for tight carbonate reservoirs is critical for a sustained production enhancement. This reservoir oil production has increased by 150% from existing wells with rigless intervention. This paper demonstrates the economical development of deep tight carbonate reservoirs through fit-for-purpose workflows. The findings were utilized to update the full field development strategy.