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Abstrak :
[ABSTRAK
Reservoir modeling dan estamasi produksi dari proyek waterflooding di lapangan Lengo telah dilakukan. Reservoir modeling merupakan langkah pertama dimana di tahapan ini dihasilkan model reservoir geologi dari lapangan Lengo yang kemudian akan dilakukan pembagiaan kelas-kelas reservoirnya berdasarkan data porositas. Langkah kedua adalah aplikasi teori Buckley ? Leverett yang digunakan untuk mengestimasi nilai gain produksi dan waktu yang dibutuhkan dari breakthrough hingga sumur monitor memproduksi 100% air. Berdasarkan reservoir modeling yang dikontrol oleh data core, lapisan L3/4 di lapangan Lengo dapat dibagi menjadi 5 kelas (0-9.5% kelas 1; 9.5-17.04% kelas 2; 17.04-23.91% kelas 3; 23.91-28.53% kelas 4 dan 28.53-33.91 kelas 5). Pada skema waterflooding telah dipilih 9 sumur kandidat injeksi dan 11 sumur produksi dimana kerakteristik reservoir sumur-sumur injeksi tersebut masuk dalam kelas 3 dan 4. Aplikasi teori Buckley ? Levertt menunjukkan bahwa kecepatan waktu breakthrough sangat dipengaruhi oleh sifat permeabilitas relative minyak-air dan Pore volume batuan (Porositas * Ketebalan). Dari perhitungan yang telah dilakukan konfigurasi sumur injector ? produksi 3-3, 7-8 dan 9-9 diprediksi akan menghasilkan penambahan produksi yang bagus.

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ABSTRACT
Reservoir modelling and production estimastion of waterflooding project has been conducted on Lengo filed. In this project reservoir modeling are the first steps to creat the reservoir geology model of the Lengo field and then used to make reservoir class depent on porosity data. The second steps are the Buckley ? Levrett theory that used to estimate the gain production and time from Breakthough until 100% water produce in monitoring well. Based on the reservoir model wich control by core data, the L3/4 reservoir in Lengo field can be devided into 5 class (0-9.5% as class 1; 9.5-17.04% as class 2; 17.04-23.91% as class 3; 23.91-28.53% as class 4 dan 28.53-33.91 as class 5). For the waterflooding project we use 9 wells for injection well and 11 wells for prodctuion/monitoring well where the reservoir charcteristic for all candidate wells included in class 3 and 4. Aplication of Buckley ? Leverett show that Breakthrourgh time very effected by oil /water relative permeability and pore volume (Porosity * H) of the reservoir. Based on the calculation configuration of injector-production wells of 3-3, 7-8 and 9-9 will be produce good gain i.e., 218.3MSTB, 196.8 MSTB and 437.1 MSTB, Reservoir modelling and production estimastion of waterflooding project has been conducted on Lengo filed. In this project reservoir modeling are the first steps to creat the reservoir geology model of the Lengo field and then used to make reservoir class depent on porosity data. The second steps are the Buckley – Levrett theory that used to estimate the gain production and time from Breakthough until 100% water produce in monitoring well. Based on the reservoir model wich control by core data, the L3/4 reservoir in Lengo field can be devided into 5 class (0-9.5% as class 1; 9.5-17.04% as class 2; 17.04-23.91% as class 3; 23.91-28.53% as class 4 dan 28.53-33.91 as class 5). For the waterflooding project we use 9 wells for injection well and 11 wells for prodctuion/monitoring well where the reservoir charcteristic for all candidate wells included in class 3 and 4. Aplication of Buckley – Leverett show that Breakthrourgh time very effected by oil /water relative permeability and pore volume (Porosity * H) of the reservoir. Based on the calculation configuration of injector-production wells of 3-3, 7-8 and 9-9 will be produce good gain i.e., 218.3MSTB, 196.8 MSTB and 437.1 MSTB]

Abstrak :
Perhitungan waterflooding pada reservoar satu dimensi didirikan oleh teori Buckley-Leverett. Selanjutnya teori tersebut diperluas dan disederhanakan oleh Welge. Langkah pengerjaannya berupa penarikan garis singgung dari kurva fractional flow. Tugas akhir ini mencoba untuk membandingkan penyelesaian waterflooding reservoar 1 dimensi secara analitis dengan secara metode numerik. Metode ini lebih mudah dikerjakan dengan bantuan komputer. Sebagai tambahan, metode analisis digunakan untuk menghitung recovery factor dengan nilai laju injeksi atau tekanan injeksi yang bervariasi. Analisa ini dapat dikembangkan untuk kondisi menjari dengan sedikit modifikasi. Listing pemrograman dan perbandingan kedua metode ditampilkan pada bab pengolahan data untuk menggambarkan kegunaan masing-masing metode. ......Waterflooding calculation in a one-dimensional reservoar were first established by Buckley-Leverett theory. Later, this theory was extended and simplified by Welge. The procedure is graphical in nature, and involves drawing tangents on the fractional flow curve. This study compares to solve this problem by analytical technique for waterflooding calculations in a one-dimensional reservoar with numeric method. The numeric method can easily be implemented on a computer. In addition, the analytical method extends the Welge?s analysis further by incorporating recovery factor calculations under variable injection rate or injection pressure values. The analysis can also be adopted for viscous fingering conditions with slight modifications. A flow chart for the computer program is given, and an example problem is solved to illustrate the utility of these methods.

Abstrak :
ABSTRACT
Antiklinorium structures that are spreading in the area of Rembang Zone along the Central Java to East Java reflect oil traps that lay under the surface. The oil fields have been exploited since the time of the Dutch occupation leaving the water cut at above 95%. Interpretation of reserves and production forecasts made by many researchers conclude that the remaining oil is still in the range of 50% (OOIP). To overcome the problem, the Government recently encouraged researchers to conduct a comprehensive review in terms of enhanced oil recovery with the goal of increasing the oil recovery in this zone by as much as possible. The XYZ-oil field in the Rembang Zone has a widely spread reservoir sandstone in the border area of the Central Java - East Java. Reservoir rocks in this area contain calcareous and silty matrix. Clay minerals are distributed almost evenly with high kaolinite content (30% of the bulk clay mineral). Kaolinite is a mineral that is easily removed by fluid flow so that it would create problems during the oil production process. The composition of injection water collected from several wells can also easily form slugs and scale as indicated by the occurrence of crude oil and bacteria that behave as a very corrosive substance that tends to facilitate the creation of production and equipment damage. This study conducted an experiment in enhanced oil recovery using waterflooding. To avoid the occurence of non-Darcy flow, critical velocity analysis was conducted obtaining a value of 37.6 ft/day. This velocity is defined as a maximum injection velocity of the water displacement in this waterflooding experiment. Based on the waterflooding experiment of X-Well in the laboratory, the injection of oil using injection water without additives led to an increase in oil recovery of 0.77% Pore Volume (%PV), while the displacement of injection water added with additives resulted in an increase in oil recovery by as much as 1.31%PV.