The successful implementation of carbon dioxide-enhanced oil recovery (CO2-EOR) is crucial in increasing oil production and reducing carbon emissions. For this reason, screening criteria are needed for the initial characterization of a suitable CO2-EOR reservoir. The existing screening model treats the screening parameters independently. Therefore, each parameter has its criteria limit and does not relate to the others. However, in reality, several screening parameters are interdependent, so we need a method that treats the interdependent parameters simultaneously. This research develops a new simultaneous screening model using the interdependency of the parameters. Quantitative and actual data were collected from CO2-EOR field documentation worldwide with a comprehensive analysis. A statistical approach with a correlation analysis method was used to determine the interconnected screening parameters. The results were synchronized with the expert domain to match actual physical conditions. The limit of simultaneous screening criteria was acquired by multivariate quality control (MQC) based on the principal component analysis (PCA) method. The proposed screening model was compared with 13 actual projects, and demonstrated improvements to previous models. The results match actual operations and follow the expert domain rules. If the miscible CO2-EOR is met, then the immiscible should also be appropriate but not vice versa. Nevertheless, four different immiscible projects are predicted to be slightly optimistic as miscible or immiscible.

Mt. Ijen, especially along the Banyupait/Banyuputih Catchment Area is located within part of 3 regencies in East Java Province which are Bondowoso, Situbondo, and Banyuwangi regencies. Geological Study at Mt. Ijen Complex was conducted to get better understand concerning Characteristics of Geology and geomorphology of Ijen Volcano Complex which compose of highly atractive places to be geotourism purposes. According to the geological study, Ijen Geotourism can be divided into three parts. Firstly, natural views inventory within the Ijen Caldera, along the Banyupait/Banyuputih Catchment Area which are closely related with geological processes; secondly, Man-made geotourism sites at Banyuputih River on the north flank of Ijen Volcano; and thirdly, Planned Buildings that can be made in the future such as a small museum and geosites in opend field including infrastructures that consist of media-tools explaining about the Ijen Volcano and a lot of geological processes related with the all natural views at around Ijen Volcano. On the other hand, the water of the Ijen crater-lake is extremely acid (pH<1). The water of the crater-lake infiltrates into the only one river called Banyupait / Banyuputih River flowing towards the north to reach the north-coast of Java at Asembagus Sub-district, where the pH at this area is still 3-4 after mixing between the acid water and normal water coming from springs within the Banyupait / Banyuputih Catchment Area. A recommended segregation of normal water from the acid water is the best alternative to produce normal water along the Banyuputih River which flows through Asembagus Village. This effort will change the Asembagus citizen to be having much better wellfare. This effort will also support the Ijen Complex to be a good Geotourism, even to lift up the Mt. Ijen Complex to be an International Geopark.

Electrical submersible pump merupakan pompa sentrifugal bertingkat banyak atau multi stage dengan beberapa impeller dan difusser di setiap stage/sambungan. Peralatan ESP dibagi menjadi peralatan diatas permukaan dan dibawah permukaan yang terdiri dari electrical motor, protector, pompa, cable dan lain-lain. Prinsip kerja electric submersible pump yaitu diposisikan di dalam sumur dan digantung pada tubing.Salah satu sumur produksi dilapangan Y adalah sumur X yang rate produksinya mencapai 2751 BFPD. Dengan rate produksi minyak sebesar 27,51 BOPD dan water cut sebesar 99%, penulis melakukan evaluasi untuk menentukan kinerja pompa dan mengoptimalkan laju alir produksi dengan menggunakan metode vogel IPR dua fasa. Hasil yang didapat untuk kinerja pompa existing atau data yang ada saat ini Pump Intake Pressure (PIP) sebesar 255 psi, 34 stage dan tipe transformator sebesar 200 Hp. Sedangkan hasil yang didapat setelah melakukan perhitungan dengan metode vogel didapatkan Pump Intake Pressurenya sebesar 520 psi, 47 stage, powernya 81 HP. Dengan diketahuinya kinerja pompa ESP di sumur X, selanjutnya penulis dapat menentukan kapasitas produksi sumur dengan menggunakan IPR. Hasil rate produksi yang semula 2751 BFPD menjadi 635,64 BFPD. Dari hasil penelitian tersebut maka dapat dilihat bahwa laju alir produksi bertambah setelah dilakukan perhitungan dengan metode vogel.