No abstract

The MRA platform is one of the offshore platforms located in the north of the Java Sea. The MRA platform has 4 production wells, namely MRA-2ST, MRA-4ST, MRA-5, and MRA-6 wells. The 4 production wells are produced using an artificial lift in the form of a gas lift. The limited gas lift at the MRA Platform at 3.1 MMSCFD makes the production of wells at the MRA Platform not optimal because the wells in the MRA Platform are experiencing insufficient gas lift. Optimization of gas lift injection is obtained by redistribution of gas lift injection for each. The results of the analysis in this study indicate that the optimum gas lift injection for the MRA-2ST well is 0.5552 MMSCFD, the MRA-6 well is 1.0445 MMSCFD, the MRA-5 well is 0.7657 MMSCFD, finally the MRA-4ST well with gas injection. lift is 0.7346 MMSCFD. The manual gas lift in the MRA-4ST is also replaced based on an economic feasibility analysis to ensure that the gas lift injection for each well can be kept constant. The redistribution of gas lift carried out by the author has increased the total production rate of the MRA Platform by 11,160 BO/year or approximately USD 781,200/year. Keywords: Gas lift; Insufficient; Optimization

Hydraulic fracturing is one of the stimulation methods to increase rock permeability. Hydraulic fracturing is commonly used in reservoir that have low permeability and wells which have a decline in production rate. In many cases, hydraulic fracturing show significant success which is marked by an increase in the production rates. In this paper, hydraulic fracturing will be conducted by observing the effects of pumping rates. A case example is taken from an oil well that has a low resistivity reservoir, which is HAP#532 well. This low resistivity causes the reservoir to have low permeability and small production rates. The scenario of hydraulic fracturing in HAP#532 well is done by using several different pumping rate sensitivity, start from 10 BPM, 20 BPM, and 30 BPM, as based on 15 BPM base case pumping rates to obtain the most optimal pumping rate. Therefore, it can be seen how much the effect of pumping rates on hydraulic fracturing. From three scenarios performed by using FracCADE and Prosper, author get the optimal pumping rate is 20 BPM. At this pumping rate, the fracture geometry obtained fracture half-length (Xf) is 213 ft, fracture height (hf) is 45.6 ft, fracture width (Wavg) is 0.56 inch, average permeability is 58.09 mD, and the production rate is 348 BOPD.

Line packing adalah suatu proses penyimpanan gas dalam pipa dengan cara memperbesar laju alir di inlet sementara laju alir outlet dipertahankan konstan. Perbedaan laju alir ini menyebabkan sifat alirannya menjadi unsteadystate (transient). Proses line packing dilakukan untuk menjamin pasokan gas selama terjadi masalah. Pada makalah ini, model aliran transient beserta permasalahan pada batas akan diselesaikan secara numerik menggunakan skema Richtmyer, hal ini disebabkan karena analisis kestabilan menunjukkan bahwa skema Richtmyer lebih baik dari skema eksplisit lainnya. Dari contoh kasus yang diberikan, diperoleh hasil bahwa skema Richtmyer cukup mendekati data di lapangan, yang kebanyakan merupakan kasus aliran unsteady-state.

Biosurfactants “U-Champ” is made by microorganisms, it could be changes the fluid characteristics which are, viscosity and Interfacial tension (IFT). In this study, will be presented the effect of Biosurfactan “U-Champ” injection into the heavy oil sample on laboratory experiment. Viscosity and IFT measurement was carried out in this experiment to analyze the characteristic changes. Coreflooding experiment also occur to measure the incremental of oil recovery. We used some of concetration of Biousrfactant “U-Champ” (1%;2,5%;5%;10%). In this experiment, we found 5% concetration of Biosurfactant “U-Champ” as the CMC value. The result of observation indicates the reduction of viscosity from 5.57 cp to 1.76 cp at 30oC, and from 1 cp to 0.95 cp at 80oC, and reduced the IFT value from 10.05 mN/m to 3.81 mN/m. Based on the result, Coreflooding experiment was occur to measure the incremental of oil recovery and obtained the increasing of recovery factor from 37,5% after waterflooding process to 81,25%. Finally, this studies feasible to continue in pilot project.