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Cost Minimization Model of Gas Transmission Line for Indonesian SIJ Pipeline Network Siregar, Septoratno; Soewono, Edy; Siregar, Daniel; Putra, Satya A.; Budicakrayana, Yana
Journal of Engineering and Technological Sciences Vol 35, No 1 (2003)
Publisher : ITB Journal Publisher, LPPM ITB

Optimization of Indonesian SIJ gas pipeline network is being discussed here. Optimum pipe diameters together with the corresponding pressure distribution are obtained from minimization of total cost function consisting of investment and operating costs and subjects to some physical (Panhandle A and Panhandle B equations) constraints. Iteration technique based on Generalized Steepest-Descent and fourth order Runge-Kutta method are used here. The resulting diameters from this continuous optimization are then rounded to the closest available discrete sizes. We have also calculated toll fee along each segment and safety factor of the network by determining the pipe wall thickness, using ANSI B31.8 standard. Sensitivity analysis of toll fee for variation of flow rates is shown here. The result will gives the diameter and compressor size and compressor location that feasible to use for the SIJ pipeline project. The Result also indicates that the east route cost relatively less expensive than the west cost.

The Effect of CaO and MgO as Expanding Additives to Improve Cement Isolation Strength under HPHT Exposure Rubiandini, Rubi; Siregar, Septoratno; Suhascaryo, Nur; Efrial, Deny
Journal of Engineering and Technological Sciences Vol 37, No 1 (2005)
Publisher : ITB Journal Publisher, LPPM ITB

Cementing is one of the most important parts in oil-well drilling. Recent development in oil-well drilling technology has led to a more problematic case in cementing. High temperature cementing is one of the problems. High temperature cementing may cover steam recovery wells, geothermal wells and ultra deep wells.The use of expanding cements as an effort to improve the sealing efficacy of annulus cementing has been considered for a long time as a promising solution to the existing problems. CaO and MgO have been proposed as two of the most effective additives to create excellent expanding cement.The purpose of this study is to find the effect of adding up burnt pure CaO and MgO to the value of compressive strength and shear bond strength of API class G cement in high pressure and high temperature condition. The method that we used within this research is an evaluation of the data taken from a simulator that simulated within temperature range of 100 â 250 oC and pressure of 2000 psi.The conclusion is taken according to the results which saying that the addition of burnt pure CaO and MgO would increase the shear bond strength and the compressive strength on specific condition up to 200 oC temperature. The addition wonât be effective for the condition of 250 oC temperature. The behavior of cement strength was also influenced by the length of curing time.Further more, research on expanding cement needs to be developed and extended whether to vary its compositions, temperatures, or curing time conditions. The compatibility when mixed with other additives together with silica flour has not yet been figured out.

The Effect of Surfactant Characteristics on IFT to Improve Oil Recovery in Tempino Light Oil Field Indonesia Swadesi, Boni; Marhaendrajana, Taufan; Mucharam, Leksono; Siregar, H.P. Septoratno
Journal of Engineering and Technological Sciences Vol 47, No 3 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Water injection has been employed in the Tempino oil field since 1996. The current oil recovery factor is 35% of OOIP. Even though the pressure is still high, the oil production rate has declined rapidly and the water cut is approaching 89%. In order to mobilizeÂ theÂ oil from theÂ reservoirÂ more effectively, surfactant flooding is one of the solutions that can reduce residual oil saturation. Interaction between crude oil and compatible surfactant generates microemulsion,Â as an indication of low interfacial tension. Hence the oil is expected to move out of the pore throat easily. In this research, thirty types of surfactantsÂ were evaluated. The hydrophilicÂ lipophilicÂ balance (HLB)Â was calculated andÂ theÂ interfacial tension (IFT)Â with theÂ reservoir fluidÂ was measured. HLB criteria were established as an indicator of low IFT, which was then tested for Berea core flooding. The results indicate that an HLB between approximately 2.7 and 3.1 (on Daviesâ Scale) or greater than 11.5 (on Griffinâs Scale) givesÂ low IFTÂ (~10-3 dynes/cm).Â This characteristicÂ is possesed by surfactantÂ ethoxyÂ carboxylateÂ with aÂ linear hydrophobic structure.Â This surfactant produces a high incremental oil recovery according to Berea core flood tests. The AN2NS and AN3 surfactants recovered 90% and 86% of OOIP respectively.

A Mathematical Model of Intermittent Gas Lift in Elevation-Production Operation with Line-Pack and Line-Drafting Phenomena in a Gas Line Silvya Dewi Rahmawati; Tasmi Tasmi; Pudjo Sukarno; Agus Yodi Gunawan; Edy Soewono; Septoratno Siregar; Edward L. Tobing
Journal of Earth Energy Engineering Vol. 9 No. 2 (2020): OCTOBER
Publisher : Universitas Islam Riau (UIR) Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jeee.2020.5264

This paper discusses a transient model of the intermittent gas lift technique in an oil well. The model is developed in the gas line, in the tubing-casing annulus, and the tubing. The line-pack and line-drafting phenomena in the gas line are considered in the model. A numerical approach will be used to solve the mathematical model that represents fluid flow during intermittent gas lift injection. The dynamics of important variables in the intermittent gas lift are investigated and analyzed to determine the best production strategy for intermittent gas lift. The variables are film thickness and velocity, slug height and velocity, and gas height and velocity. The relationships between surface injection control parameters (gas injection pressure and gas injection rate) and the velocity and height of film, gas, and liquid are shown in one cycle of the gas lift intermittent process. The higher the gas injection pressure, the faster the gas injection velocity, and the thinner the film thickness in the tubing. In order to obtain clean tubing from film thickness, the gas injection pressure needs to be optimized, which will lead to maintaining compressor discharge pressure availability. Detailed observation of the dynamic performance inside the tubing production well will give the optimum oil production rate for oil wells under a gas lift intermittent production strategy for field application.

Cost Minimization Model of Gas Transmission Line for Indonesian SIJ Pipeline Network Septoratno Siregar; Edy Soewono; Daniel Siregar; Satya A. Putra; Yana Budicakrayana
Journal of Engineering and Technological Sciences Vol. 35 No. 1 (2003)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2003.35.1.3

Optimization of Indonesian SIJ gas pipeline network is being discussed here. Optimum pipe diameters together with the corresponding pressure distribution are obtained from minimization of total cost function consisting of investment and operating costs and subjects to some physical (Panhandle A and Panhandle B equations) constraints. Iteration technique based on Generalized Steepest-Descent and fourth order Runge-Kutta method are used here. The resulting diameters from this continuous optimization are then rounded to the closest available discrete sizes. We have also calculated toll fee along each segment and safety factor of the network by determining the pipe wall thickness, using ANSI B31.8 standard. Sensitivity analysis of toll fee for variation of flow rates is shown here. The result will gives the diameter and compressor size and compressor location that feasible to use for the SIJ pipeline project. The Result also indicates that the east route cost relatively less expensive than the west cost.

The Effect of CaO and MgO as Expanding Additives to Improve Cement Isolation Strength under HPHT Exposure Rubi Rubiandini; Septoratno Siregar; Nur Suhascaryo; Deny Efrial
Journal of Engineering and Technological Sciences Vol. 37 No. 1 (2005)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2005.37.1.3

Cementing is one of the most important parts in oil-well drilling. Recent development in oil-well drilling technology has led to a more problematic case in cementing. High temperature cementing is one of the problems. High temperature cementing may cover steam recovery wells, geothermal wells and ultra deep wells.The use of expanding cements as an effort to improve the sealing efficacy of annulus cementing has been considered for a long time as a promising solution to the existing problems. CaO and MgO have been proposed as two of the most effective additives to create excellent expanding cement.The purpose of this study is to find the effect of adding up burnt pure CaO and MgO to the value of compressive strength and shear bond strength of API class G cement in high pressure and high temperature condition. The method that we used within this research is an evaluation of the data taken from a simulator that simulated within temperature range of 100 "“ 250 oC and pressure of 2000 psi.The conclusion is taken according to the results which saying that the addition of burnt pure CaO and MgO would increase the shear bond strength and the compressive strength on specific condition up to 200 oC temperature. The addition won't be effective for the condition of 250 oC temperature. The behavior of cement strength was also influenced by the length of curing time.Further more, research on expanding cement needs to be developed and extended whether to vary its compositions, temperatures, or curing time conditions. The compatibility when mixed with other additives together with silica flour has not yet been figured out.

The Effect of Surfactant Characteristics on IFT to Improve Oil Recovery in Tempino Light Oil Field Indonesia Boni Swadesi; Taufan Marhaendrajana; Leksono Mucharam; H.P. Septoratno Siregar
Journal of Engineering and Technological Sciences Vol. 47 No. 3 (2015)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2015.47.3.2

Water injection has been employed in the Tempino oil field since 1996. The current oil recovery factor is 35% of OOIP. Even though the pressure is still high, the oil production rate has declined rapidly and the water cut is approaching 89%. In order to mobilize the oil from the reservoir more effectively, surfactant flooding is one of the solutions that can reduce residual oil saturation. Interaction between crude oil and compatible surfactant generates microemulsion, as an indication of low interfacial tension. Hence the oil is expected to move out of the pore throat easily. In this research, thirty types of surfactants were evaluated. The hydrophilic lipophilic balance (HLB) was calculated and the interfacial tension (IFT) with the reservoir fluid was measured. HLB criteria were established as an indicator of low IFT, which was then tested for Berea core flooding. The results indicate that an HLB between approximately 2.7 and 3.1 (on Davies' Scale) or greater than 11.5 (on Griffin's Scale) gives low IFT (~10-3 dynes/cm). This characteristic is possesed by surfactant ethoxy carboxylate with a linear hydrophobic structure. This surfactant produces a high incremental oil recovery according to Berea core flood tests. The AN2NS and AN3 surfactants recovered 90% and 86% of OOIP respectively.

Hasil Studi Laboratorium Penentuan Karakteristik Alamiah Surfaktan Natrium Lignosulfonat Dari Ampas Tebu Sebagai Fluida Injeksi Di Reservoir Minyak Rini Setiati; Septoratno Siregar; Taufan Marhaendrajana; Deana Wahyuningrum
JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Vol. 3 No. 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Trisakti

Surfaktan Natrium Lignosulfonat (NaLS) dari ampas tebu merupakan salah satu pengembangan surfaktan lignosulfonat yang dibuat dari limbah nabati, yaitu adalah ampas tebu. Pada studi ini telah diperoleh hasil sintesa ampas tebu menjadi surfaktan lignosulfonat yang jika dikembangkan akan dapat menjadi alternatif surfaktan sebagai fluida injesi di reservoir minyak. Dari hasil penelitian dan pengujian yang telah dilakukan, surfaktan NaLS ampas tebu ini mempunyai kesamaan komponen dengan surfaktan lignosulfonat standar yaitu terdiri dari gugus ulur alkena, gugus ulur sulfonat, gugus tekuk karboksilat dan gugus tekuk ester. Berdasarkan analisis spektrum NMR, molekul monomer lignosulfonat tersebut mempunyai atom C, O, H dan S di dalam dengan jumlah atom C = 11, O = 8, H = 16, dan S = 1, sehingga rumus empiris monomer lignosulfonat adalah (C11H16O8S)n, dengan massa molekul relatif 308,06. Berdasarkan struktur monomer lignosulfonat ampas tebu, maka gugus-gugus fungsi dalam strukturnya dapat dikelompokkan sebagai gugus hidrofil atau gugus hidrofob dan dapat dihitung nilai HLB (Hidrofil-lipofilik Balance) yang dimiliki oleh surfaktan NaLS ampas tebu tersebut yaitu sebesar 11,62. Dengan nilai HLB ini maka surfaktan NaLS ampas tebu ini sesuai penggunaannya sebagai sistem tipe emulsi O/W (oil in water), yang berarti surfaktan tersebut larut dalam air dan dapat digunakan sebagai fluida injeksi.

POTENSI KEBERHASILAN KULIT UDANG SEBAGAI BAHAN DASAR POLIMER KITOSAN: STUDI LITERATUR Rini Setiati; Septoratno Siregar; Deana Wahyuningrum; M. Taufik Fathaddin
JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Vol. 6 No. 1 (2021)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Trisakti

Tujuan dari penelitian ini adalah untuk mempelajari potensi yang dimiliki oleh kulit udang sebagai bahan baku polimer kitosan. Penelitian ini diawali dengan proses pemisalahan kulit udang kitin dan proses kitin menjadi kitosan serta menguji karakteristiknya. Kulit udang dapat diolah menjadi kitosan karena kandungan kitin yang terdapat di dalamnya. Kitin merupakan bahan organik utama terdapat pada kelompok hewan crustacea, insekta, fungi, mollusca dan arthropoda. Cangkang kepiting, udang dan lobster juga merupakan sumber bahan dasar produksi kitin karena kandungan kitinnya cukup tinggi. Kitin merupakan biopolimer alam paling melimpah kedua setelah selulosa yang tidak beracun dan diproduksi dari limbah kulit udang. Kitosan diolah dari kulit udang melalui proses deproteinasi, demineralisasi dan deasetilasi. Reagen yang digunakan adalah NaOH dan KOH. Kemudian kitosan diuji sifat fisiknya melalui uji kadar air, kadar abu, kadar nitrogen, viskositas, derajat deasetilasi, analisis gugus fungsi dengan spektroskopi IR dan kristalinitas dengan difraksi sinar X. Sifat fisik kitosan dilihat dari bentuk fisik, analisis gugus fungsi dan kristalinitas. Potensi penerapan kitosan, sebagai turunan kitin yang terdeasetilasi, bersifat multidimensi, seperti dalam makanan dan gizi, bioteknologi, ilmu material, obat-obatan dan farmasi, pertanian dan perlindungan lingkungan. Isolasi kitin dari kulit udang dan sintesanya menjadi kitosan, menjadikan kulit udang lebih barmanfaat untuk bidang-bidang lain. Kulit udang yang diolah menjadi kitosan polimer dapat berpotensi untuk digunakan dalam bidang Enhanced Oil Recovery sebagai fluida injeksi kimiawi dalam upaya menaikkan produksi minyak.

Hasil Studi Laboratorium Penentuan Karakteristik Alamiah Surfaktan Natrium Lignosulfonat Dari Ampas Tebu Sebagai Fluida Injeksi Di Reservoir Minyak Rini Setiati; Septoratno Siregar; Taufan Marhaendrajana; Deana Wahyuningrum
JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Vol. 3 No. 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/pdk.v3i1.2483

Surfaktan Natrium Lignosulfonat (NaLS) dari ampas tebu merupakan salah satu pengembangan surfaktan lignosulfonat yang dibuat dari limbah nabati, yaitu adalah ampas tebu. Pada studi ini telah diperoleh hasil sintesa ampas tebu menjadi surfaktan lignosulfonat yang jika dikembangkan akan dapat menjadi alternatif surfaktan sebagai fluida injesi di reservoir minyak. Dari hasil penelitian dan pengujian yang telah dilakukan, surfaktan NaLS ampas tebu ini mempunyai kesamaan komponen dengan surfaktan lignosulfonat standar yaitu terdiri dari gugus ulur alkena, gugus ulur sulfonat, gugus tekuk karboksilat dan gugus tekuk ester. Berdasarkan analisis spektrum NMR, molekul monomer lignosulfonat tersebut mempunyai atom C, O, H dan S di dalam dengan jumlah atom C = 11, O = 8, H = 16, dan S = 1, sehingga rumus empiris monomer lignosulfonat adalah (C11H16O8S)n, dengan massa molekul relatif 308,06. Berdasarkan struktur monomer lignosulfonat ampas tebu, maka gugus-gugus fungsi dalam strukturnya dapat dikelompokkan sebagai gugus hidrofil atau gugus hidrofob dan dapat dihitung nilai HLB (Hidrofil-lipofilik Balance) yang dimiliki oleh surfaktan NaLS ampas tebu tersebut yaitu sebesar 11,62. Dengan nilai HLB ini maka surfaktan NaLS ampas tebu ini sesuai penggunaannya sebagai sistem tipe emulsi O/W (oil in water), yang berarti surfaktan tersebut larut dalam air dan dapat digunakan sebagai fluida injeksi.

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