Judul: Formulasi Surfaktan Metil Ester Sulfonat sebagai Oil Well Cleaning
Abstrak: Oil productivity reduction may be due to plugging in the oil rock formations. The plugging may be caused by the deposition of paraffin, asphaltene, and scale. Problem caused by the presence of the precipitate is the rock formation can be oil wet so that oil permeability decreases. The problem can be solved by well cleaning technique with surfactant formula. Surfactant MES is a type of anionic surfactant which has ability to lower the interfcial tension, surface tension, and able to change the properties of rock from oil wet to become water wet. Surfactant MES formula for well cleaning requires carrier agent. In this study, diesel oil and metil ester were used as carrying agent. Aromatic solvents were also needed. Xylene and toluene has ability to dissolve asphaltene that deposites in formation. Surfaktan formulation for well cleaning was done with several stages, those are determine the SMES concentration and aromatic solvents concentration. Surfactant performance tests for oil well cleaning were thermal stability, phase behavior, and wettability. The surfactant formula which gave the best performance was SMES 3% in metil ester carrying agent with xylene 15% as additive.
Keyword: methyl sulfonic esters, oil well cleaning, Asphaltene

Judul: Formulasi Surfaktan SMES sebagai Acid Stimulation Agent untuk Aplikasi di Lapangan Karbonat OK
Abstrak: Methyl Sulfonic Esters (MES) is one type of anionic surfactants which have advantages in terms of its hardness, resistance to deterjensi, the character of renewable and environmentally friendly. Excess MES this can be utilized as stimulation agent in oil wells, so can increase productivity an oil well. Increased productivity an oil well done by means of cleaning oil wells and pore a reservoir fromsediment of scale formed, enlarging the pores of rocks and can changing the nature of rocks being water-wet. This research was carried out to obtain the formula of solution of surfactants-based MES that can be applied as acid stimulation agent that is one method of IOR. Formula tested is a combination of surfactants sodium MES, HCl, and CH3COOH. The formulation is done by determining the optimum concentration of surfactant SMES and HCl gradually. The best results obtained from the solution of acid stimulation agent was with value of IFT < 10-2 dyne/cm with solubility of rock reaches 36%, and was can to change the contact angle of the reservoir rocks of the contact angle number 420 became 680 in formula SMES 6% + HCl 7% and CH3COOH 2%.
Keyword: acid well stimulation, IOR, IFT, Sodium Methyl Sulfonic Esters

Judul: Beberapa aspek anatomi alat sirkulasi ruang dada kancil
Abstrak: Telah dilakukan penelitian dengan menggunakan 10 ekor kancil dewasa jantan dan betina dengan tujuan untuk menge- tahui beberapa aspek anatomi alat sirkulasi di dalam ruang dada, meliputi jantung, pembuluh darah yang keluar dan ma- suk jantung serta ukuran-ukuran jantung. Kancil merupakan ruminansia terkecil di dunia, hidup di daerah tropika India, Thailand, Malaysia dan Indonesia bagian barat. Hewan ini dilindungi dan mempunyai prospek yang baik untuk hewan penelitian maupun dibudidayakan. Hasil penelitian menunjukkan bahwa berat jantung rаta-rata adalah 0.69% dari berat rata-rata kancil. Dan ini mirip pada jantung kuda dan anjing. Bentuk jantung lonjong seperti halnya ruminansia. Demikian pula letaknya di dalam ruang dada seperti pada ruminansia dengan adanya Ligamentum sternopericardiacum. Di dalam ventrikel kanan membersit sebuah Musculus (M.) papillaris dari dindingnya dan tiga sampai empat Musculi (Mm.) papillares dari Septum interventriculare. Hanya dua buah Mm. papillares yang berukuran besar dibersitkan dari dinding ventrikel kiri. Percabangan Arteri (A.) coronaria sinistra lebih dominan dari pada A. coronaria dextra. Sedangkan A. sub clavia sinistra dicabangkan langsung dari aorta di dorso- caudal pembersitan Truncus (Tr.) brachiocephalicus…
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