Search Repository STTMIGAS Balikpapan

Injeksi air merupakan metode peningkatan perolehan tahap Secondary Recovery. Penginjeksian air berguna
sebagai energi tambahan untuk meningkatkan produktivitas reservoir yang telah mengalami penurunan
tekanan secara alami. Air yang diinjeksikan berperan sebagai fluida pendorong yang akan mendorong
minyak keluar melalui sumur produksi.
Untuk menentukan hasil performa injeksi dapat menggunakan beberapa metode, pada penelitian ini metode
yang digunakan adalah Metode Decline Curve Analysys dan Metode Buckley Leverett. Metode ini digunakan
untuk mengevaluasi kinerja injeksi air dan lama waktu yang diperlukan untuk breaktrough.
Dengan menggunakan metode decline curve analysys hasil perhitungan pada Sumur AS-09 nilai UR
sebelum injeksi air sebesar 1,966,234 STB setelah injeksi air sebesar 2,120,434 STB. RF sebelum injeksi air
sebesar 16,57% dan sesudah injeksi sebesar 17,86%.RR sebelun injeksi air sebesar 71,386 STB dan setelah
injeksi air sebesar 123,871 STB. Sumur AS-16 nilai UR sebelum injeksi air sebesar 679,896 STB setelah
injeksi air sebesar 1,122,297 STB. RF sebelum injeksi air sebesar 5,73% dan sesudah injeksi sebesar 9,46%.
RR sebelun injeksi air sebesar 11,108 STB dan setelah injeksi air sebesar 32,857 STB. Sumur AS-17 nilai
UR sebelum injeksi air sebesar 353,566 STB setelah injeksi air sebesar 891,038 STB. RF sebelum injeksi air
2,98% sebesar dan sesudah injeksi sebesar 7,51%. RR sebelun injeksi air sebesar 33,885 STB dan setelah
injeksi air sebesar 539,874 STB. Sumur AS-49 nilai UR sebelum injeksi air sebesar 104,960 STB setelah
injeksi air sebesar 197.493 STB. RF sebelum injeksi air sebesar 0,88% dan sesudah injeksi sebesar 1,66%.
RR sebelun injeksi air sebesar 11,539 STB dan setelah injeksi air sebesar 23,568 STB. Sumur AS-51 nilai
UR sebelum injeksi air sebesar 259,856 STB setelah injeksi air sebesar 368,819 STB. RF sebelum injeksi air
sebesar 2,19% dan sesudah injeksi sebesar 3,11%. RR sebelun injeksi air sebesar 22,962 STB dan setelah
injeksi air sebesar 3,920 STB. Dengan metode Buckley Leverett hasil perhitungan pada Sumur AS-09
kumulatif air yang diinjeksikan (Winj) sebesar 342,168,878 BBL/day, waktu breaktrough selama 427,711
hari dengan kumulatif produksi air (Wp) sebesar 109,757,822 STB. Sumur AS-16 kumulatif air yang
diinjeksikan (Winj) sebesar 409,260,815 BBL/day, waktu breaktrough selama 511,576 hari dengan
kumulatif produksi air (Wp) sebesar 131,278,964 STB. Sumur AS-17 kumulatif air yang diinjeksikan (Winj)
sebesar 214,694,198 BBL/day, waktu breaktrough selama 268,367.75 hari dengan kumulatif produksi air
(Wp) sebesar 68,867,653 STB. Sumur AS-49 kumulatif air yang diinjeksikan (Winj) sebesar 333,327,028
BBL/day, waktu breaktrough selama 416,658 hari dengan kumulatif produksi air (Wp) sebesar 106,921,614
STB. Sumur AS-51 kumulatif air yang diinjeksikan (Winj) sebesar 5,595,132 BBL/day, waktu breaktrough
selama 6,993 hari dengan kumulatif produksi air (Wp) sebesar1,794,755 STB

Water injection is a method of increasing the acquisition of the Secondary Recovery stage. Water injection is
useful as additional energy to increase the productivity of reservoirs that have experienced a natural
pressure drop. The injected water acts as a driving fluid that will push the oil out through the production
well.
To determine the results of injection performance, several methods can be used, in this study the methods
used are the Decline Curve Analysys Method and the Buckley Leverett Method. This method is used to
evaluate the performance of water injection and the length of time required for breaktrough.
By using the decline curve analysis method, the calculation results on the AS-09 Well, the UR value before
water injection is 1,966.234 STB after water injection is 2,120,434 STB. RF before water injection is 16.57%
and after injection is 17.86%. RR before water injection is 71.386 STB and after water injection is 123.871
STB. AS-16 well, the UR value before water injection is 679,896 STB after water injection is 1,122,297 STB.
RF before water injection is 5.73% and after injection is 9.46%. RR before water injection is 11,108 STB
and after water injection is 32,857 STB. AS-17 well, the UR value before water injection is 353.566 STB
after water injection is 891.038 STB. RF before injection of water is 2,98% and after injection is 7,51%. RR
before water injection is 33,885 STB and after water injection is 539,874 STB. AS-49 well, the UR value
before water injection is 104,960 STB after water injection is 197,493 STB. RF before water injection is
0.88% and after injection is 1.66%. RR before water injection is 11.539 STB and after water injection is
23,568 STB. The AS-51 well has a UR value before water injection of 259,856 STB after water injection of
368,819 STB. RF before water injection is 2.19% and after injection is 3.11%. RR before water injection is
22,962 STB and after water injection is 3,920 STB. With the Buckley Leverett method, the calculation results
in the AS-09 Well the cumulative injected water (Winj) is 342,168,878 BBL/day, the breaktrough time is
427,711 days with the cumulative water production (Wp) of 109,757,822 STB. AS-16 wells cumulatively
injected water (Winj) of 409,260.815 BBL/day, breaktrough time of 511.576 days with cumulative water
production (Wp) of 131,278,964 STB. AS-17 wells cumulatively injected water (Winj) of 214,694,198
BBL/day, breaktrough time is 268,367.75 days with cumulative water production (Wp) of 68,867,653 STB.
AS-49 wells cumulatively injected water (Winj) of 333.327,028 BBL/day, breaktrough time is 416,658 days
with cumulative water production (Wp) of 106,921,614 STB. AS-51 wells cumulatively injected water (Winj)
of 5,595,132 BBL/day, breaktrough time of 6,993 days with cumulative water production (Wp) of 1,794,755
STB.