Matrix acidizing stimulation evaluation of well I-25 field Jatibarang.

Well I-25 of Field Jatibarang is an oil well that produces at 3746-3753 ft depth. The well perforation penetrates Pre Parigi unit of Cibulakan formation. The formation has porosity and permeability of 18 and 62 mD respectively. This specific unit is majorly consisted of limestone. I-25 has been indicated with CaCO₃ scale and formation damage based on Stability Index method proposed by Stiff and Davis. The Stability index number obtained was +1.373 and skin factor was +0.85. Based on these numbers, it was then decided to perform matrix acidizing on I-25. Acid selection was based on the rock lithology. Chloride acid (HCl) was proposed due to its soluble products and high reactivity whenever the reaction involves limestone or dolomite. This paper's methodology begins with data acquisition, followed by calculation-based evaluation. The comparison of evaluation parameters ultimately tells if the stimulation succeeded or not. These parameters are as follows: flow rate, productivity index, inflow performance relationship, Skin factor, and flow efficiency,. Flow rate increased from 40 bfpd to 195 bfpd. Oil flow rate increased from 10 bopd to 35.3 bopd. Flow efficiency improved from 0.93 to 4.55 which indicates permeability improvement, primarily within the damage radius. Skin factor improved from +0.85 to -5.625, and transmissibility factor increased from 271 md-ft/cp to 276 md-ft/cp. Based on these numbers, it can be concluded that matrix acidizing performed on I-25 succeeded. [ABSTRACT FROM AUTHOR]