Claim Missing Document
Check
Articles

Found 7 Documents
Search

STUDI POLIMER GEL DENGAN CROSSLINKER MENGENAI PENGARUH VARIASI KONSENTRASI POLYMER, SALINITAS, DAN SUHU TERHADAP GELATION TIME DAN RESISTANCE FACTOR Frigrina, Lolyta; Kasmungin, Sugiatmo; Mardiana, Dwi Atty
PROSIDING SEMINAR NASIONAL CENDEKIAWAN Prosiding Seminar Nasional Cendekiawan 2017 Buku I
Publisher : Lembaga Penelitian Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Permasalahan terproduksinya air dalam jumlah besar akan menurunkan perolehanminyak dan gas pada suatu reservoir atau lapangan migas. Salah satu metode yangdapat digunakan untuk mengurangi terproduksinya air formasi adalah denganmenambahkan polimer gel dan crosslinker pada reservoir agar terjadi proses water shutoff(WSO) pada reservoir tertentu. Parameter untuk menentukan polimer gel yang tepatdigunakan pada proses WSO adalah terbentuknya gel pada larutan polimer dancrosslinker. Metode botol tes merupakan salah satu cara efektif untuk menentukangelation time dan mengestimasi jenis gel strength yang terbentuk. Hasil penelitianmenunjukkan bahwa peningkatan suhu 150°F -180°F akan mempercepat proses gelationtime, dan peningkatan konsentrasi polimer 5.000 ppm – 10.000 ppm akan meningkatkanresistance factor dan permeability reduction yang berakibat dapat menghambat produksiair.
STUDI MODIFIKASI GAS LIFT VALVE UNTUK MENINGKATKAN KAPASITAS LAJU ALIR GAS INJEKSI PADA GAS LIFT VALVE 1” IPO DENGAN METODE SIMULASI FLUID DYNAMIC Rohman, Adam Fatchur; Kasmungin, Sugiatmo; Mardiana, Dwi Atty
Prosiding Seminar Nasional Pakar Prosiding Seminar Nasional Pakar 2019 Buku I
Publisher : Prosiding Seminar Nasional Pakar

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sistim gas lift digunakan sebagai artificial lift di lapangan XXX, dengan kedalaman rata-rata sumur produksi gas lift sebesar 3.000-3.500 ft. Menggunakan desain 3 hingga 5 Gas lift Valve (GLV) dengan ukuran 1 inch. Salah satu permasalahan pada optimasi sumur gas lift adalah, terbatasnya jumlah gas injeksi yang dapat diinjeksikan akibat keterbatasan tekanan compressor. Penelitian ini bertujuan untuk mencari modifikasi geometri GLV untuk meningkatkan efisiensi sistim gas lift sehingga dapat mendapatkan produksi yang optimal. Modifikasi desain GLV ini mencakup perubahan geometri orifice GLV. Kajian desain dengan menggunaan simulasi Computational Fluid Dynamic (CFD) bertujuan untuk menganalisis setiap perubahan desain geometri GLV terhadap performance laju alir gas di dalam GLV yang digambarkan dalam valve performance curve. Pendekatan modifikasi desain sesuai dengan geometri venturi orifice GLV dan ketersediaan peralatan untuk melakukan modifikasi GLV. Hasil dari simulasi CFD modifikasi pertama dengan meningkatkan diameter orifice dari 0.25 inch ke 0.5 inch dengan kondisi tekanan upstream 650 psig dan downstream 625 psig meningkatkan kapasitas laju alir gas injeksi sebesar 355% dan modifikasi kedua dengan bentuk orifice venturi  sebesar 280%. Pada modifikasi bentuk orifice venturi untuk mecapai laju alir gas injeksi maksimal membutuhkan perbedaan tekanan sebesar 10%. Dengan optimasi peningkatan kapasitas laju alir injeksi dari hasil Simulasi menunjukan potensi kenaikan produksi sumursebesar 44.9%.
Pengaruh Permeabilitas dan Konsentrasi Polimer terhadap Saturasi Minyak Sisa pada Injeksi Polimer Vilanti, Avty; Kasmungin, Sugianto; Mardiana, Dwi Atty
Journal of Mechanical Engineering and Mechatronics Vol 2, No 01 (2017): Journal of Mechanical Engineering and Mechatronics
Publisher : Journal of Mechanical Engineering and Mechatronics

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (731.514 KB)

Abstract

Polymer injection is one of the methods of increasing oil recovery or Enhanced Oil Recovery (EOR) after the water injection method is performed, to reduce residual oil saturation. The polymer reduces the water mobility ratio so that the sweeping efficiency will increase to encourage bypassed and unswept residual oil saturation. For polymer injection applications, partially hydrolyzed polyacrylamide (PHPA) or commercially known as HPAM is the most widely used type. At the current low oil prices, design optimization of polymer injections in certain reservoirs is important. The purpose of this research is to analyze the effect of permeability and polymer concentration on residual oil saturation by core flooding method in the effort of optimization of polymer injection. The optimal concentration in this study is 1,500 ppm which has the lowest residual oil saturation value. The increase in concentration from 500 ppm to 1.500 ppm, residual oil saturation decreased in four variations of Berea sandstone permeabilities. However, when the polymer concentration is added to 2.500 ppm, the residual oil saturation value increases. This can be caused by pore clogging. Whereas with permeability, residual oil saturation is directly proportional. The greater the permeability the greater the value of residual oil saturation. Core Y7 Berea has the highest permeability and saturation of residual oil. The results of this study are expected to be useful in the development of polymer injections on EOR activity.Keywords. polymer injection, concentration, permeability, PHPA, residual oil saturation
Geometry Modified Square Edge Orifice Valve Study for Efficiency Gas Lift with Computational Fluid Dynamic (CFD) Method Rohman, Adam Fatchur; Kasmungin, Sugiatmo; Mardiana, Dwi Atty
Journal of Earth Energy Science, Engineering, and Technology Vol 2, No 1 (2019): JEESET VOL. 2 NO. 1 2019
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jeeset.v2i1.4651

Abstract

The gas lift lifting system is widely used as an artificial lift on the X Field, with an average depth of gas lift production wells of 3,000-3,500 ft. Design of 3 to 5 Gas lift Valves (GLV) designwith size of 1 inch is ussualy applied. While at the point of gas injection, the GLV square edge orifice is applied. The problem in the optimization of gas lift wells is the flow instability due to gas flow rate fluctuations, the limited volumetric gas injection and limited gas compressor pressure. With the limited compressor pressure, the lift flow and gas design speed is very dependent on the amount of pressure on the compressor, the production wells with limited injection pressure will result in a limited amount of gas injection, the square edge orifice requires a pressure difference of 40% to achieve the maximum gas flow rate. This study aims to find the modification of the GLV orifice geometry to improve the efficiency of the gas lift system so that it can get optimal production. This GLV design modification includes changing the GLV orifice geometry. Design studies using Computational Fluid Dynamic (CFD) simulations aim to analyze any changes in GLV geometry design to the performance of the gas flow rate in the orifice valve described in the valve performance curve. The design modification approach is in accordance with the GLV venturi orifice geometry and the availability of equipment for GLV modification. The CFD simulation results of the first modification geometry by increasing the orifice diameter from 0.25 to 0.5 inch with the condition of upstream 650 psig and downstream 625 psig pressure increasing the injection gas flow rate capacity by 355% and modifying the second geometry with the venturi orifice form by 280%. In modifying the shape of the orifice venture to reach critical flow requires a pressure difference of 10%. Based on simulation results, the modified orifice application is able to increae production up to 44%.
ANALISIS KEEKONOMIAN PROYEK GAS-TO-LIQUID SEBAGAI ALTERNATIF PEMANFAATAN CADANGAN GAS ALAM INDONESIA Thahir, Muhammad Abizar Algiffary; Mardiana, Dwi Atty
PETRO Vol 7, No 4 (2018): DESEMBER (EDISI KHUSUS)
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/petro.v7i4.4287

Abstract

The reservoir on Field A that has an estimated large reserve of natural gas of 10,73 TSCF would have a potential economic value when developed correctly. The natural gas reserve is planned to be extracted by utilizing 18 subsea production wells connected to five subsea manifolds at a depth of 300 ‒ 1000 m at below sea level. Gas production will be done by using FPSO. Produced gas then will be pumped to onshore processing facilities on Yamdena island through undersea pipeline that used corrosion resistant alloy as long as up to 100 km in length. The natural gas processing would either be done by building an LNG facility scenario or building a GTL facility scenario on Yamdena island. The LNG scenario would produce the natural gas into LNG and gas condensate. While the GTL scenario would produce the natural gas as a synthetic liquid fuel such as LPG, naphtha, kerosene, and diesel. The feed gas volume used on both scenarios is assumed to be 1.041 MMSCFD. The economic indicator calculated for GTL yields an NPV of 1.743,44 MMUS$ and for LNG yields 1.940,51 MMUS$. The IRR calculated for GTL yields 13,27% and for LNG yields 13,14%. The POT period calculated from cummulative cash inflow for GTL scenario will take 9,84 years time, while on LNG scenario POT will take 9,90 years time. The PI value calculated for GTL scenario yields a value of 1,46 and for LNG scenario yields a value of 1,44. Results from sensitivity analyses on economic indicator found that the parameters which has significant effect on the change of economic indicator values are product sell price.
Estimation of Indonesia's Energy Demand to 2030 and Alternatives Scenario to Reduce Oil Dependence Mardiana, Dwi Atty; Kartoatmodjo, RS. Trijana; Kasmungin, Sugiatmo
Indonesian Journal of Energy Vol 1 No 2 (2018): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33116/ije.v1i2.24

Abstract

The impacts of high dependence on oil on the economy have encouraged many countries to start eliminating or sharply reducing their dependence on oil consumption. As an oil importer as well as oil and gas producer country, Indonesia seeks to do the same thing by eliminating fuel subsidies, shifting to gas, and developing renewable energy. The oil price affects the economic and energy policies and impacts the efforts of reducing oil dependence. Using an econometric model of Indonesia’s energy that is constructed based on its energy balance model, this paper will examine factors that influence the oil demand in Indonesia. It will estimate the country’s energy needs from 2017 to 2030 and simulate various alternative strategies to deal with oil dependencies, such as an increase in the refinery capacity, and a shift from oil to gas in the transportation sector. This paper suggests that shifting from oil to gas in the transportation sector will be able to reduce oil dependency, while the alternative of increasing refinery capacity to 3 million barrel per day will be an opportunity to support greater short-term energy security and economic returns. Keywords: Economy, econometric, energy, oil dependence, sustainable energy security
APLIKASI PENGGUNAAN WELL HEAD COMPRESSOR PADA SUMUR X UNTUK MENGATASI PROBLEM LIQUID LOADING Nugroho, Nurkhozin Adhi; Fathaddin, Muh Taufiq; Mardiana, Dwi Atty
Jurnal Migasian Akamigas Balongan Indramayu Vol 2 No 2 (2018): Jurnal Migasian
Publisher : LPPM AKAMIGAS BALONGAN

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sumur “X” mengalami problem liquid loading dikarenakan laju alir gas kurang dari critical velocity oleh karena itu dilakukan metode delikuifikasi dengan menggunakan well head compressor. Tujuan dari penelitian ini adalah mengidentifikasi terjadi liquid loading pada sumur gas, menghitung critical velocity loading, melakukan analisis nodal pada sumur “X” dan membuat kurva IPR, menganalisa sensitivitas nilai Pwh dan water gas ratio terhadap laju produksi pada aplikasi well head compressor, melakukan analisa teknis dan ekonomi penggunaan well head compressor. Metodologi yang digunakan dalam penelitian ini adalah identifikasi liquid loading dengan laju alir kritis (critical velocity) menggunakan metode Coleman, membuat model sumur dengan bantuan perangkat lunak PROSPER, aplikasi metode well head compressor dengan sensitivitas beberapa Pwh dengan bantuan perangkat lunak PROSPER, evaluasi laju produksi beberapa Pwh asumsi terhadap laju alir kritis, menganalisa sensitivitas nilai Pwh dan water gas ratio (WGR) terhadap laju produksi pada aplikasi well head compressor dan melakukan analisa teknis dan ekonomi penggunaan well head compressor pada sumur X. Dari hasil perhitungan Pwh kondisi existing di dapatkan nilai laju alir loading berdasarkan metode Coleman sebesar 0,276 MMSCFD dan nilai critical velocity loading sebesar 34,061 ft/sec. Dengan bantuan software PROSPER 11.5 terbentuk kurva IPR yang menghasilkan nilai absolute open flow (AOF) sebesar 1,178 MMSCFD. Pada simulasi tekanan Pwh sebsar 10 Psig menghasilkan nilai laju alir gas sebesar 0,213 MMSCFD dan laju alir kritis loading sebesar 0,205 MMSCFD. Nilai NPV pada opsi beli sebesar 0,18 dan pada opsi sewa sebesar 0,24, nilai IRR pada opsi beli sebesar 8,07 % dan pada opsi sewa nilai IRR lebih dari 100%, nilai POT pada opsi beli sebesar 10 bulan dan pada opsi sewa sebesar 1 bulan. Opsi sewa lebih di pilih karena lebih baik nilai parameter NPV, IRR dan POT. Dari hasil simulasi dengan software PROSPER penggunaan well head compressor dapat di gunakan untuk mengatasi problem liquid loading pada sumur X yaitu pada P suction 10 Psig atau lebih kecil tidak akan terjadi liquid loading. Dari sensitivitas nilai Pwh dan WGR terhadap laju produksi gas dapat terlihat dari laju produksi yang dihasilkan, semakin kecil nilai Pwh dan WGR maka laju produksi akan semakin besar.