Abstract. This paper perfoms a discussion of the result from two laboratory tests of surfactant injection. The first test is focused on the influence of salinity that varies between 5000 ppm-9000 ppm with a concentration of 1% surfactant to the value of density, viscosity, interfacial tension, and Recovery Factor. The second test is performing the influence of surfactant concentration that varies between 0.1% -1% with a value of 5000 ppm salinity to the value of residual oil saturation, density, viscosity, and interfacial tension. The result of the first test shows that along with the increase of salinity levels, the increase in viscosity and density will occured as well. However, variations in salinity does not affect to the value of interfacial tension. Meanwhile, on Recovery Factor testing, the Recovery Factor optimal value of 61.53% was obtained when the salinity levels 6,000 ppm. The result of the second test showed that the addition of surfactant concentration lead to a decrease in the residual oil saturation and interfacial tension, but it may cause an increase in density and viscosity.

<p>The unidealized of physical and rheological mud can occured when drilling on rock layers with high salt concentrations. It is therefore necessary to add an additive to balance the effect of the salt. The aims of this study is to see the effect of salt addition on various temperature drilling mud.</p><p>This research will use two types of mud with different oil-water ratio. The drilling mud will be divided into four compositions, ie LA, LB, LC, and LD. LA and LC compositions have an oil-water ratio of 80% oil and 20% fresh water. While LB and LD compositions have oil-water ratio of 75% oil and 25% fresh water. Then the study was conducted at various temperatures, ie 80 °F, 130 °F, 180 °F, 230 °F, 280 °F, and 330 °F. After observing of the physical properties and rheology of drilling mud, it was found that the effect of adding salt NaCl can improve the physical and rheological properties of mud such as density, viscosity, gel strengh, mud cake, and solid content. Conversely, the effect of adding NaCl salt may reduce the nature of electrical stability. While the increasing of the temperature can reduce the physical and rheological properties of mud and on the contrary the loss of water and mud cake will increase.</p>

Salah satu metode dalam Enhanced Oil Recovery adalah Chemicalflooding. Pada penelitian laboratorium ini dilakukan injeksi larutan surfaktan berbahan dasar AOS pada batuan sandstone dengan konsentrasi 05%, 1%, dan 2% dalam masing-masing salinitas 5.000 ppm dan 10.000 ppm. Hal ini bertujuan untuk mengetahui pengaruh kenaikan konsentrasi pada surfaktan terhadap perolehan minyak. Sebelum dilakukan tahapan injeksi, terlebih dahulu dilakukan uji fisik larutan surfaktan, sehingga dapat ditentukan larutan yang akan diinjeksikan ke dalam batuan. Dari proses uji fisik didapati bahwa semakin tinggi konsentrasi larutan makan nilai dari densitas, viskositas, dan spesific gravity akan turut meningkat. Dalam prakteknya, larutan surfaktan akan menurunkan nilai tegangan antarmuka (IFT) sehingga dapat meningkatkan perolehan minyak yang tersisa dalam pori-pori batuan. Nilai IFT terendah adalah pada surfaktan dengan konsentrasi 2%, sedangkan yang tertinggi surfaktan dengan konsentrasi 0,5%. Pengaruh kenaikan konsentrasi surfaktan terbukti lebih optimal, memiliki nilai recovery factor sebesar 43,89% dengan konsentrasi 2% salinitas 10.000 ppm.

Dalam rangka mempercepat peningkatan produksi, diusulkan untuk dilakukan perencanaan pengembangan dengan dilakukan beberapa sekenario dan injeksi air yang diterapkan untuk lapisan X1 dan lapisan X2 lapangan X. Penelitian ini dilakukan menggunakan simulasi reservoir dengan menggunakan black oil simulator CMG 2015. Data yang diperlukan untuk input ke simulator adalah data PVT, data SCAL, dan data sejarah produksi. Setelah dilakukan input data, kemudian dilakukan inisialisasi, history matching, dan kemudian dilakukan perencanaan pengembangan lapangan dengan 3 skenario yang berbeda. Simulasi dilakukan dengan rentang waktu antara 2019 sampai dengan 2035. Pada simulasi basecase dilakukan terhadap delapan sumur produksi dan satu sumur injeksi existing yang disimulasikan hingga tahun 2035 tanpa mengubah parameter yang berkaitan. Pada simulasi skenario 1 dilakukan workover terhadap 13 sumur yang sudah tidak beroprasi. Pada simulasi skenario 2 dilakukan penerapan pola injeksi air adjusted inverted five spot yaitu gabungan antara inverted four spot dan inverted five spot dengan menambahkan sembilan sumur injeksi. Pada skenario 2 ini dilakukan juga uji sensitivitas laju injeksi. Pada simulasi skenario 3 dilakukan penerapan pola injeksi air adjusted normal five spot dengan menggabungkan normal five spot dan normal four spot dengan menambahkan 45 sumur injeksi Pada skenario 3 ini dilakukan juga uji sensitivitas laju injeksi. Hasil yang di dapat dari penelitian ini didapatkan skenario terbaik adalah skenario 3. Pada skenario ke 3, injection rate terbaik adalah 200 bwpd sehingga dapat menghasilkan kenaikan recovery factor sebesar 5.46% dengan Np sebesar 8.4 MMSTB.

<em>In a study entitled "Analysis of Production Tests with Orifice Plate on the J-97 Well KYU Geothermal Field" will discuss the production test. Geothermal production tests are conducted to determine the potential of the production capacity of a well at different wellhead pressures so that the value of the mass flow rate and the well production curve is obtained. J-97 well is one-phase steam well, so the production test method used is to use the orifice plate. The pressure data read by the orifice plate is then converted to a mass flow rate. Calculating the mass flow rate can use the British Standard 1042 method. In the production test to obtain the final result in the form of a production curve, the gas deliverability equation can be used. The method used in the S-87 well is Flow After Flow Test (Back pressure Test). The final result of the curve shows a decrease in the production line calculated using the British Standard 1042 method..</em>

<p>In this pandemic period, people are required to be more creative and able to see the slightest opportunity. Although these opportunities come from waste that is usually discarded or not reused, such as waste cooking oil. Waste cooking oil is usually thrown into the sewer. Therefore, proper handling is needed so that waste cooking oil is beneficial and does not cause harm from aspects of human health and the environment. Various efforts have been made, one of them by making candles from used cooking oil.</p>The location of this community service activity is in RW 07, Duri Pulo Village, Central Jakarta. The main purpose of community service activity at this location is to provide training and knowledge to housewives of RW 07 Kelurahan Duri Pulo, Central Jakarta regarding the importance of processing the waste cooking oil waste in order to provide added value that can improve their life economy. Candles are an object that has a fairly important role in human daily life, especially when there is no electricity. Socialization and training are the methods chosen in this community service activity. This is because direct learning is easier to remember than just counseling. This activity went smoothly and received good enthusiasm from the housewives of RW 07 Duri Pulo Village, Central Jakarta. These housewives asked our team to regularly held this community service activity and even suggested to conduct further research on the purification of the waste cooking oil so that it is safe to reuse like a new cooking oil

<p>Lingkungan kerja yang aman, sehat dan bebas dari pencemaran adalah hal yang diingini oleh setiap perusahaan. Oleh sebab itu dirasa sangat penting, kami para dosen dari Program Studi Teknik Perminyakan Universitas Trisakti, mengadakan penyuluhan dan pelatihan tentang K3 terhadap para penambang tradisional di Desa Wonocolo, Jawa Timur.  Penyuluhan dan pelatihan tersebut bertujuan untuk mengurangi terjadinya kecelakaan dan penyakit akibat kerja sehingga dapat meningkatkan sistem efisiensi dan produktivitas kerja. Perusahaan di Indonesia secara umum termasuk rendah kepeduliannya tentang K3 dibandingkan dengan negara-negara tetangga lain. Indonesia akan sulit menghadapi pasar global dengan kondisi seperti ini,  karena akan mengalami ketidakefisienan pemanfaatan tenaga kerja disebabkan oleh produktivitas kerja yang rendah. Masalah-masalah yang telah diuraikan sebelumnya diupayakan untuk didekati dengan menggunakan gambar-gambar maupun alat peraga. Dengan adanya penyuluhan dan pelatihan tentang K3, diharapkan dapat mengurangi resiko kecelakaan dan gangguan kesehatan bagi para penambang maupun masyarakat di sekitarnya.</p>

<p><em>A</em><em> good reservoir management is needed </em><em>to maintain</em><em> the </em><em>availability and </em><em>quality of geothermal production fluid. When producing geothermal fluids, there are some changes in reservoir parameters such as declining of reservoir pressure and temperature, chemical composition of geothermal fluids, </em><em>and </em><em>states of fluid that would affect the quality of reservoir by mixing, boiling, or cooling processes that may be happened </em><em>because of</em><em> those changes. </em><em>It is</em><em> becoming a concern on reservoir management. In this case, chemical </em><em>concentrations </em><em>of fluid</em><em>s</em><em> monitoring is one of methods that can perform to reach a well reservoir management of geothermal field. With </em><em>chemical </em><em>monitoring process, current reservoir condition and processes </em><em>that </em><em>occurred during exploitation can be defined</em><em>. In ELS-02 by monitoring and analyzing its enthalpy changes, chloride concentration changes, and NCG concentration changes and supported by its calcium, sulphate, and carbonate concentration profile, two processes could be defined:</em><em> </em><em>mixing with </em><em>surface </em><em>cooler water and reinjection breakthrough.</em><em> </em><em>Other than that, casing leak that causing surface water enter the well could be detected.  </em><em>These become a sign to reservoir engineer to prepare for problems that may occur in near time </em><em>term </em><em>relating to well problem </em><em>such as scaling </em><em>and long time problem like massive cooling or drying of reservoir. After all, further development scenario of Elsa field can be made to improve its performance in producing fluids and heats. </em></p><p> </p>