Peramalan laju alir produksi dan cadangan sumur minyak lapangan Y dgn metode DCA menggunakan OFM
P eramalan laju alir produksi dan cadangan sumur minyak pada lapangan “Yâ€dilakukan dengan metode DCA menggunakan perangkat lunak OFM. Sumursumur minyak yang dianalisis pada lapangan “Y†antara lain: TX-1, TX-2, TX-3,TX-4, TX-4R, TX-8, TX-9, TX-10, TX-11, TX-12, TX-13, TX-14, TX-15. Tujuandari metode DCA pada penelitian ini adalah untuk mengetahui nilai remainingreserve, estimated ultimate recovery, recovery factor dan batas laju alir produksiminimum.Berdasarkan analisis menggunakan perangkat lunak OFM, tipe decline curveyang paling ekuivalen untuk meramalkan laju alir produksi minyak dan cadanganpada lapangan “Y†adalah hyperbolic decline. Nilai arps’ decline curve exponent(b) adalah 0,844076, dan initial nominal exponential decline rate (Di) adalah0,00906842/bulan. Batas laju alir produksi minimum pada lapangan “Y†adalah 3bbl/day.Hasil analisis nilai remaining reserve dari masing-masing sumur secaraberurutan adalah 26,6654 MSTB, 312,09 MSTB, 4,73493 MSTB, 296,027 MSTB,19,017 MSTB, 2,11368 MSTB, 0,11084 MSTB, 30,6265 MSTB, 11,4087 MSTB,2,88187 MSTB, 21,169 MSTB, 0,23771 MSTB, 0,494785 MSTB. Hasil analisisuntuk nilai estimated ultimate recovery dari masing-masing sumur secara berurutanadalah 630,6654 MSTB, 2085,09 MSTB, 12,73493 MSTB, 1187,027 MMSTB,25,017 MSTB, 108,11368 MSTB, 2,11084 MSTB, 80,6265 MSTB, 108,4087MSTB, 57,88187 MSTB, 120,169 MSTB, 22,23771 MSTB, 1,494785 MSTB.Hasil analisis untuk nilai recovery factor dari masing-masing sumur secaraberurutan adalah 5,68%, 18,79%, 0,11%, 10,70%, 0,23%, 0,97%, 0,02%, 0,73%,0,98%, 0,52%, 1,08%, 0,20%, 0.01%.Jika dihitung total hasil analisis dari seluruh sumur maka diperoleh nilairemaining reserve sebesar 230,61 MSTB, estimated ultimate recovery sebesar3944,61 MSTB, dan recovery factor sebesar 35.56%. Berdasarkan hasil analisisbatas waktu produksi minyak bumi pada lapangan “Y†adalah 833 bulan(31/07/2094).
F orecasting the production flow rate and remaining oil wells reserves for“Yâ€field are carried out using DCA method by OFM software. The oil wellsanalyzed in the “Y†field include: TX-1, TX-2, TX-3, TX-4, TX-4R, TX-8, TX-9, TX10, TX-11, TX-12, TX-13, TX-14, TX-15. The purpose of the DCA method in thisstudy is to determine the value of remaining reserves, estimated ultimate recovery,recovery factor and minimum production rate limit.Based on the analysis using OFM software, the most equivalent type ofdecline curve to predict the rate of oil production and reserves in “Y†field ishyperbolic decline. The value of arps’ decline curve exponent (b) is 0.844076, andinitial nominal exponential decline rate (Di) is 0.00906842/month. The minimumeconomic limit production rate in “Y†field is 3 bbl/day.The analysis result of remaining reserve by each wells sequentially 26.6654MSTB, 312.09 MSTB, 4.73493 MSTB, 296.027 MSTB, 19.017 MSTB, 2.11368MSTB, 0.11084 MSTB, 30.6265 MSTB, 11.4087 MSTB, 2.88187 MSTB, 21.169MSTB, 0.23771 MSTB, 0.494785 MSTB. The analysis result of estimated ultimaterecovery by each wells sequentially are 630.6654 MSTB, 2085.09 MSTB, 12.73493MSTB, 1187.027 MMSTB, 25.017 MSTB, 108.11368 MSTB, 2.11084 MSTB,80.6265 MSTB, 108.4087 MSTB, 57.88187 MSTB, 120.169 MSTB, 22.23771MSTB, 1.494785 MSTB. . The analysis result of recovery factor by each wellssequentially are 5.68%, 18.79%, 0.11%, 10.70%, 0.23%, 0.97%, 0.02%, 0.73%,0.98%, 0.52%, 1.08%, 0.20%, 0.01%.If the total analysis results are calculated for all wells, the remaining reservevalue is 230.61 MSTB, the estimated ultimate recovery value is 3944.61 MSTB, andrecovery factor value is 35.56%. Based on the analysis result of oil production timelimit in the “Y†field is 833 months (31/07/2094).