ZAKI, RIFA AHMAD (2024) PENENTUAN CADANGAN MINYAK SISA LAPISAN X PADA SUMUR “RF-031” & “RF-131” LAPANGAN “RAZ” DENGAN METODE DECLINE CURVE ANALYSIS. Other thesis, UPN Veteran Yogyakarta.
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Abstract
RINGKASAN
PENENTUAN CADANGAN MINYAK SISA LAPISAN X PADA
SUMUR “RF-031” & “RF-131” LAPANGAN “RAZ” DENGAN
METODE DECLINE CURVE ANALYSIS
Oleh
Rifa Ahmad Zaki
NIM: 113190110
(Program Studi Sarjana Teknik Perminyakan)
Sumur RF-031 & RF-131 merupakan sumur yang diproduksikan dari lapisan X
Formasi Duri pada Lapangan “RAZ” yang berada di daerah utara Cekungan
Sumatera Tengah. Diketahui bahwa sumur RF-031 mulai berproduksi pada tahun
2004 dengan jumlah produksi hingga saat ini sebesar 175,322 MSTB. Sementara
itu sumur RF-131 mulai berproduksi pada tahun 2015 dengan jumlah produksi
hingga saat ini yaitu sebesar 249,358 MSTB. Seiring berjalannya waktu cadangan
yang tersimpan dari kedua sumur ini pasti akan berkurang. Oleh karena itu perlu
dilakukan perhitungan untuk mengetahui nilai estimasi produksi yang dapat
dilakukan kedua sumur ini. Dari nilai tersebut nantinya dapat diketahui juga nilai
cadangan sisa yang dapat diproduksikan hingga batas economic limit produksi yaitu
sebesar 10 BOPD (target perusahaan) serta lama umur produksi yang tersisa dari
kedua sumur tersebut.
Adapun metode perhitungan yang digunakan pada studi ini yaitu decline curve
analysis (DCA) dengan metode Trial Error and X2 Chi-square Test. Dimulai
dengan menentukan periode decline dari grafik semilog antara rate produksi (qo)
vs waktu (t) dari masing-masing sumur. Kemudian dilakukan perhitungan untuk
menentukan tipe decline (b) dan rate decline (Di). Setelah itu melakukan forecast
dengan menggunakan rumus dari tipe decline yang terpilih dan nilai rate decline
yang telah dihitung sebelumnya. Forecast dilakukan untuk mengetahui umur
produksi yang ekonomis yaitu hingga rate produksi telah mencapai batas economic
limit sebesar 10 BOPD.
Dari hasil perhitungan dan analisa, diketahui bahwa sumur RF-031 memiliki nilai
Estimate Ultimate Recovery (EUR) sebesar 197,857 MSTB dengan Remaining
Reserve (RR) sebesar 22,535 MSTB. Sementara sumur RF-131 memiliki nilai EUR
sebesar 275,897 MSTB dengan RR sebesar 25,634 MSTB. Recovery Factor (RF)
dari sumur RF-031 sebesar 2,27% & sumur RF-131 sebesar 3,15%. Diprediksi
bahwa well abandonment time dari sumur RF-031 yaitu pada Januari 2026
sementara sumur RF-131 pada Agustus 2025.
Kata kunci: Decline Curve Analysis, Trial & Error X2 Chi-square Test, Estimate
Ultimate Recovery, Recovery Factor, Remaining Reserve
ABSTRACT
DETERMINING OIL RESERVES IN LAYER X OF THE "RF-
031” & “RF-131” WELL IN THE “RAZ” FIELD USING THE
DECLINE CURVE ANALYSIS METHOD
By
Rifa Ahmad Zaki
NIM: 113190110
(Petroleum Engineering Undergraduated Program)
Wells RF-031 & RF-131 are two of several wells in the "RAZ" Field in the northern
area of the Central Sumatra Basin. It is known that the RF-031 well started
producing in 2004 with total production to date of 175,32 MSTB. Meanwhile, the
RF-131 well began production in 2015 with total production to date of 249,36
MSTB. As time goes by the reserves stored from these two wells will definitely
decrease. Therefore, it is necessary to carry out calculations to determine the
estimated production value that can be carried out by these two wells. From this
value, it will also be possible to determine the value of remaining reserves that can
be produced up to the economic production limit of 10 BOPD (company target) as
well as the remaining production life of the two wells.
The calculation method used in this study is decline curve analysis (DCA) with the
Trial Error and X2 Chi-square Test method. Starting by determining the decline
period from the semilog graph between production rate (qo) vs time (t) for each
well. Then calculations are carried out to determine the type of decline (b) and rate
of decline (Di). After that, carry out a forecast using the formula for the selected
decline type and the decline rate value that was calculated previously. The forecast
is carried out to determine the economic life of production, namely until the
production rate has reached the economic limit of 10 BOPD.
From the results of calculations and analysis, it is known that the RF-031 well has
an Estimated Ultimate Recovery (EUR) value of 197,857 MSTB with a Remaining
Reserve (RR) of 22,535 MSTB. Meanwhile, the RF-131 well has a EUR value of
275,897 MSTB with an RR of 25,634 MSTB. Recovery Factor (RF) from well RF-
031 is 2,27% & well RF-131 is 3,15%. It is predicted that the well abandonment
time for the RF-031 well will be January 2026 while for the RF-131 well it will be
August 2025.
Keywords: Decline Curve Analysis, Trial & Error X2 Chi-square Test, Estimate
Ultimate Recovery, Recovery Factor, Remaining Reserve
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Decline Curve Analysis, Trial & Error X2 Chi-square Test, Estimate Ultimate Recovery, Recovery Factor, Remaining Reserve |
| Subjects: | T Technology > T Technology (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 06 Jun 2024 01:50 |
| Last Modified: | 06 Jun 2024 01:50 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/39639 |
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