Abstract
The RF reservoir is a dry gas reservoir located in Northeast java offshore that has been produced since 2018. The RF reservoir has produced 2 wells with cumulative production until December 2019 is 31.83 BSCF. In January 2018 the gas production rate from the two wells was 36 MMSCFD and the reservoir pressure at the beginning of production was 2449.5 psia, peak production occurred in April 2019 with a gas flow rate of 98 MMSCFD but in December 2019 the gas production rate from both wells decreased to 30 MMSCFD with reservoir pressure decreased to 1607.8 psia. Changes in gas flow rate and pressure in the RF reservoir will affect changes in reservoir performance, so it is necessary to analyze reservoir performance to determine reservoir performance in the future with the material balance method. Based on the results the initial gas in place (IGIP) is 80.08 BSCF. The drive mechanism worked on the RF reservoir until December 2019 was a depletion drive with a recovery factor up to 88% and a current recovery factor (CRF) is 40%. The remaining gas reserves in December 2019 is 39 BSCF and the reservoir will be made a production prediction until December 2032. Based on production predictions of the four scenarios, scenario 2 was chosen as the best scenario to develop the RF reservoir with a cumulative production is 66.1 BSCF and a recovery factor of 82.6%.
Highlights
The recovery factor (RF) gas reservoir in the NK field is in the northeast java offshore and began to be explored in 2018
At the beginning of production, namely January 2018 the gas production rate from the two wells was 36 MMSCFD, and the reservoir pressure at the beginning of production was 2449.5 psia, peak production occurred in April 2019 with a gas flow rate of 98 MMSCFD but overtime in December 2019 the gas production rate from both wells decreased to 30 MMSCFD with reservoir pressure decreased to 1607.8 psia
In the havlena odeh method, the initial gas in place (IGIP) reservoir RF is 78.5 BSCF, and the initial gas in place (IGIP) using the IPM-MBAL software is 80.09 BSCF and based on graphic analysis formed from GpBg/(Bg-Bgi) vs GpBg and Plot of Plot (F-We)/Eg vs Efw/Eg the in Figure 8 and Figure 9 shows that the graph formed is a straight line or there is no deflection which indicates that the drive mechanism that is working is the depletion drive
Summary
The RF gas reservoir in the NK field is in the northeast java offshore and began to be explored in 2018. Gas production that is carried out continuously causes a decrease in the rate of gas production and reservoir pressure. Changes in gas flow rate and pressure in the RF reservoir will affect changes in reservoir performance, both static reservoir performance, namely the number of gas reserves, and dynamic reservoir performance, namely daily gas production rate, cumulative production, and reservoir pressure. The material balance analysis using straight lines allows estimating the original volume of hydrocarbons and the parameters characterizing the aquifer, it is essential to corroborate the estimations by means of the history matching of average reservoir pressure or production (Fuentes-Cruz, Gorgonio., et al.,2021)
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