cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Wulandari
Contact Email
jurnal.lemigas@esdm.go.id
Phone
+6221-7394422
Journal Mail Official
jurnal.lemigas@esdm.go.id
Editorial Address
Jl. Ciledug Raya Kav. 109, Cipulir, Kebayoran Lama, Jakarta Selatan 12230
Location
Kota adm. jakarta selatan,
Dki jakarta
INDONESIA
Scientific Contributions Oil and Gas
Published by LEMIGAS
ISSN : 20893361     EISSN : 25410520     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy
The Scientific Contributions for Oil and Gas is the official journal of the Testing Center for Oil and Gas LEMIGAS for the dissemination of information on research activities, technology engineering development and laboratory testing in the oil and gas field. Manuscripts in English are accepted from all in any institutions, college and industry oil and gas throughout the country and overseas.
Arjuna Subject : Energi (semua kategori) - Teknologi Bahan Bakar
Articles 619 Documents
 10   11   12   13   14 
MICROALGAE BIOMASS PRODUCTIVITY BY CO2 INJECTION IN CORRELATION WITH pH VARIATION IN PHOTOBIOREACTOR Onie Kristiawan
Scientific Contributions Oil and Gas Vol 37 No 1 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.1.624

Abstract

Microalgae can bring solution for reducing CO2 and as alternative sustainable energy source. CO2reduction by microalgae was done by fi xation of CO2 during photosynthesis while they grow. The objectiveof the study is to get pH condition from CO2 injection into cultivated microalga that gives better productivityof biomass. Microalga that used was Scenedesmus.sp. Scenedesmus.sp did grown better in Walne media onlab scale experiments. CO2 injection as pH control that gave the highest dry weight obtained on pH rangevalue 7.0-7.5. As one of the controlling factor that determines the biological ability of microalgae in utilizingnutrient, pH value shows that at range of pH 8.0 – 8.5 and 9.0 – 9.5 can decrease photosynthetic process onmicroalgae Scenedesmus.sp Thus the highest fi xated CO2 also on pH value 7.0 – 7.5. This research give abrief explanation that in the range of pH 7.0 – 7.5 contain more CO2 than range pH 8.0 – 8.5 and 9.0 – 9.5.Culture temperature did not show any high fl uctuation at morning and in the mid-day of treatment.
THE EXTRACTION OF OIL FROM Nannochloropsis sp. MICROALGAE USING ULTRASONIC AND FERMENTATION AS CELL DISRUPTION Dhiti Adiya Hanupurti; Onie Kristiawan
Scientific Contributions Oil and Gas Vol 37 No 1 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.1.626

Abstract

Algae are a promising source of biofuel but claims about their lipid content can be ambiguous becauseextraction methods vary and lipid quantitation often does not distinguish between particular lipid classes.One of algae types that meet this condition is Nannochloropsis sp. Two different cell disruption methods,i.eultrasonic and fermentation followed by maceration extraction using a mixture of ethanol/hexane (1:1, v/v)as a solvent extraction were studied for their effectiveness in extraction of algae lipids from Nannochloropsissp. Contact time and amplitude were varied in ultrasonic process. Hydrolysis treatment was varied infermentation process, i.e Dillute Acid Pretreatment (DAP) hydrolysis, enzymatic hydrolysis and DAP withenzymatic hydrolysis. The result showed that ultrasonic process followed by maceration extraction wasmore effective for Nannochloropsis sp. lipid extraction. The most ideal treatment was at amplitude 40%and contact time 5 minutes with lipid content of 63.59% of dry weight.
DISCREPANCY OF MCMP DERIVED FROM EXPERIMENTS AND PREDICTION MODELS OF SOME INDONESIAN OIL FIELDS Sugihardjo Sugihardjo
Scientific Contributions Oil and Gas Vol 37 No 2 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.2.627

Abstract

Most of oil fi elds in Indonesian have been categorized as mature fi elds, since the primary stages of theoil production nearly fi nished. Therefore EOR technology is the only option to rejuvenate those old oil fi eldsto increase the oil recovery. CO2 miscible fl ooding, one of the proven EOR technology, can be implementedin some Indonesia oil fi elds if they fulfi ll the screening criteria for CO2 injection. Laboratory works initiallyshould be carried out to determine some parameters for calibrating the reservoir simulation program. Themost important parameter is MCMP (multiple contact miscibility pressure), this pressure level can be usedto determine the displacement effi ciency of the CO2 injection. Above the MCMP will be more effi cientcompare to below MCMP injection pressure. MCMP is normally can be obtained in the lab by a Slim tubeapparatus. In case there are no oil and gas sample available, some correlations based on the empiricalfi eld data are also available in the literature as well as EOS (equation of state) for predicting MCMP. Somereservoir fl uids MCMP have been evaluated using those three methods. Then, discrepancies were calculatedto compare the results of Slim tube tests, correlations and EOS calculation. Four correlations such as NPC(National Petroleum Council), Cronquist et al, Yellig-Metcalfe, Holm-Yosendal and one EOS modeling ofPeng-Robinson (1978) have been proposed to predict the MCMP fourteen reservoirs. Moreover, those MCMPwere also run using Slim tube. Holm-Yosendal correlation has nine reservoirs and secondly Yellig-Metcalfemethod possesses six reservoirs with discrepancy below 10% compare to MCMP obtained from Slim Tubetests. While the other methods are not appropriate as well as Peng-Robinson EOS modeling without anylaboratory data for calibration.
COMPARATIVE STUDY OF POROSITY DETERMINATION METHODS FOR OGIP IN FRACTURED BASEMENT RESERVOIR Usman Pasarai Pasarai
Scientific Contributions Oil and Gas Vol 37 No 2 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.2.628

Abstract

Determination of porosity in fractured basement reservoirs has always been a challenge due to thecomplexity of processes involved in the generating of pore structure as well as the rock heterogeneity. As aresult, estimate of original gas in place (OGIP) is subject to substantial uncertainty. Intention of this studyis to evaluate the most effective method to determine fracture porosity and hence reducing uncertainty ofOGIP volume in the fractured basement reservoir. The evaluation is based on comparison to the core derivedporosity as the point of reference. Included in this evaluation are the techniques of secondary porosity index(SPI), dipole share imager (DSI), dual laterolog (DL), and formation micro imager (FMI). The SPI andDSI logs derived fracture porosities are found over optimistic to the core reference. The FMI determinedfracture porosities are considered in fair agreement with core data. Results from the DL technique comparevery favorably with core data and thought to be the best calculation of porosity in the fractured basementgas reservoir investigated in this study. Those results supported by data that have been collected from thepublished literatures. Found that typical value of fracture porosities in the fractured basement rocks isless than 1%. The comparative study presented here helps in reducing uncertainty related to the fracturedbasement reservoir development.
POROSITY VERSUS DEPTH CHARACTERISTICS OF SOME RESERVOIR SANDSTONES IN WESTERN INDONESIA Bambang Widarsono
Scientific Contributions Oil and Gas Vol 37 No 2 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.2.629

Abstract

Porosity is a petrophysical property that always draws attention due to its central role in determiningstorage capacity of hydrocarbon reservoirs. Accuracy for predicting porosity in reservoir affects much ofmany petroleum production related activities. Accordingly, various attempts have been devoted to study andmodel rock porosity including its relation with depth. In this study porosity data from as many as 4654 coresamples (1773 full-diameter core plugs and 2881 sidewall core samples) is used. The core samples were takenfrom 549 wells in 222 fi elds/structures located in eight producing sedimentary basins in western Indonesia.Main results of the study are facts that existing porosity-depth models derived from data obtained from otherregions are not usable for Indonesian cases, and therefore porosity-depth models are established for theeight sedimentary basins. It is hoped that these models can contribute signifi cantly to the understanding ofrock porosity trends with depth in western Indonesia.
PALEOGENE PALYNOLOGY OF THE CENTRAL SUMATERA BASIN Eko Budi Lelono; Christina Ani Setyaningsih; L Nugrahaningsih
Scientific Contributions Oil and Gas Vol 37 No 2 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.2.632

Abstract

Unlike rich pollen assemblage of other Paleogene sediments in western Indonesia (as seen in NanggulanFormation of Central Java, Tanjung Formation of South Kalimantan and Malawa Formation of SouthSulawesi), pollen assemblage of Paleogene sediments in the Central Sumatera Basin is considerablylow. Referring to the occurrence of Oligocene spore Cicatricosisporites dorogensis supported by pollenPalmaepollenites kutchensis and Meyeripollis naharkotensis, it is inferred that the studied sediment isassigned to Oligocene age. This is strengthened by the disappearance of many key Indian affi nities whicharrived in the Sundaland during Eocene. Palynologically, this study separates the Brown Shale from theUpper Red Bed. The Brown Shale is dominated by fresh water pollen without brackish element suggestingnon-marine environment. This sequence might have been formed in syn-rift setting. Surprisingly, lacustrineindicators of fresh water algae Botriococcus and Pediastrum (as found in the lacustrine sediment of TalangAkar Formation of Sunda-Asri Basin) are absent. Mean while, the Upper Red Bed is marked by signifi cantoccurrence of brackish palynomorphs suggesting the infl uence of marine environment during post-rift period.This condition proves the existence of the transgressive phase where sedimentation started in freshwaterenvironment during the Brown Shale deposition which gradually shifted into transition (shallow marine)environment during the Upper Red Bed sedimentation.
DEVELOPMENT OF ULTRASONOGRAPHY FOR DOWNHOLE WELL INSPECTION Gathuk Widiyanto
Scientific Contributions Oil and Gas Vol 37 No 2 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.2.633

Abstract

One technique to increase oil production rate in marginal and suspended wells is solving mechanicalproblem. Success parameter to solve the mechanical problem is to identify this problem properly andaccurately. One of the tools to identify the well integrity including mechanical problem in oil and gasindustry is downhole camera used to describe bore hole conditions. Image is very important and is usedas main parameter to determine the production and operation strategy. So, imaging technology transfer isvery important especially on proven technology. Ultrasonography is proven technology in medical disciplineto create image within human body without signifi cant error. This research tries to apply ultrasonographytechnology in oil and gas industry. Recently, design and prototype of downhole inspection tools stage III havebeen completed. Prototype consists of electronic system, mechanical system and information system includedacquisition system. Laboratory test of these tools has been conducted successfully. Acquisition system usesmemory system within dry battery to avoid operation problem at fi eld test. Several advantages of this toolsare the small number data as per user’s required, user friendly and simple in operation.
CATALYTIC PYROLYSIS OF POLYPROPYLENE PLASTIC FROM MUNICIPAL SOLID WASTES INTO GASOLINE FRACTION COMPOUNDS USING THE MIXED NICKEL (Ni) AND CHROME (Cr) METALS AS THE CATALYST Morina Morina; Oberlin Sidjabat
Scientific Contributions Oil and Gas Vol 37 No 3 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.3.634

Abstract

Plastic wastes which come from municipal solid wastes, have been identi􀂿 ed as the worldwideenvironmental problem in the last decades. Chemical recycling is one of the alternative methods to solvesuch problem. Inorder to obtai appropriate liquid fuels, polypropylene plastic waste was degraded thermallyand catalytically in the presence of natural zeolite incorporated with chromium (Cr) and nickel (Ni) metals.The reaction was conducted in a 􀂿 xed bed reactor in the temperature range of 400-500°C. The dependenciesof process temperature and effect of catalyst on yield of the fuel fractions were determined and comparedto commercial gasoline fractions. The current study shows that the major product of thermal degradation(pyrolysis) and catalytic degradation is liquid (gasoline) fraction and the highest products obtained attemperature 450°C is approximately 77.84%. The use of chromium and nickel metals on activated naturalzeolite as a bi-functional catalyst enhance the yield of liquid fractions and the acidity of the catalysts. The liquid product obtained in this process was analyzed using GC for its composition. Synthesized catalysts, activated natural zeolite and natural zeolite were characterized by means of nitrogen physisorption (BET), porosity, X-ray diffraction (XRD), and acidity. Based on the obtained results, the catalyst containing 6% of chromium and 4% of nickel on activated natural zeolite is a good catalyst for conversion of polypropylene plastic wastes to liquid (gasoline) fuels. Catalytic conversion using such catalysts may applicable as an alternative method for recycling plastic wastes to more valuable commodities such as fuel oils. 
EVALUATION OF SURFACTANT WITH THIN FILM SPREADING MECHANISM FOR EOR IMPLEMENTATION Sugihardjo Sugihardjo
Scientific Contributions Oil and Gas Vol 37 No 3 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.3.635

Abstract

Wettability plays an important role of two phase Àuids Àow in porous media. The displacement efficiency of oil by injected Àuid is also dictated by wettability characteristic of reservoir rocks. This papers contents a highlight of the reservoir wettability modification by injecting TFSA (Thin Film Spreading Agent) surfactant for EOR applications through a laboratory study . TFSA used in this study is called Coconut Ethanolamide with a HLB (Hydrophilic-Lipophilic Balance) level around 13 to 15 which is very suitable for TFSA purposes. Several laboratory evaluations have been done to screen this surfactant with the aim of getting the best properties that fulfill the criteria for EOR chemical injection. Then TFSA solution tests have been carried out including compatibility, thermal stability, phase behavior, and filtration test. The results suggest that all measured parameters are suitable for chemical injection. Others parameters measuring rock Àuid interactions for instance: adsorption, wettability, imbibition, relative permeability, and core Àood experiments has been done to find the quantitative numbers for screening this surfactant. All experiment results categorize as moderate levels for passing the screening criteria for chemical injection except for the adsorption which is excellent. Even though the results of laboratory tests show this TFSA is valid for chemical injection, improvement by adding some chemicals is still suggested to find a better TFSA formula.
EFFECT OF TEMPERATURE ON RUMEN MICROBES ACTIVITY TO PRODUCE METHANE FROM COAL Bambang Agus W; Kosasih Kosasih; Irawan Sugoro; Dahrul Effendi; Byan M Pratama
Scientific Contributions Oil and Gas Vol 37 No 3 (2014)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.37.3.636

Abstract

This paper is intended to show the effect of temperature on utilization microbes of rumen Àuid to produce methane from coal (lignite, sub-bituminous and bituminous). By considering to field applications, where the CBM reservoir temperature is higher than the microbes natural living conditions in the cow's body, the experiment is carried out at a temperature of 30ºC and 50ºC with an incubation period time of 105 days. Laboratory scale study was conducted by mixing the coal, formation water and rumen Àuid (1: 1: 1). This mixture were inserted into a closed chamber equipped with a hose to measuring the volume of gas produced. The experiment results showed that the microbes of the rumen Àuid can grow on different type of coal and temperatures. The volume of gas production increased during the incubation time for all treatments. Obtained the highest methane production occurs at a temperature treatment of 50ºC for the sub-bituminous coal with a volume of 0.627liters/kg (22.14 cf/ton) from the total volume of gas produced as much as 7.25liters/kg (256 cf/ton).

Page 12 of 62 | Total Record : 619

 10   11   12   13   14 

Filter by Year

1982 2026


Reset
Filter By Issues
All Issue Vol 49 No 1 (2026) Vol 48 No 4 (2025) Vol 48 No 3 (2025) Vol 48 No 2 (2025) Vol 48 No 1 (2025) Vol 47 No 3 (2024) Vol 47 No 2 (2024) Vol 47 No 1 (2024) Vol 46 No 3 (2023) Vol 46 No 2 (2023) Vol 46 No 1 (2023) Vol 45 No 3 (2022) Vol 45 No 2 (2022) Vol 45 No 1 (2022) Vol 44 No 3 (2021) Vol 44 No 2 (2021) Vol 44 No 1 (2021) Vol 43 No 3 (2020) Vol 43 No 2 (2020) Vol 43 No 1 (2020) Vol 42 No 3 (2019) Vol 42 No 2 (2019) Vol 42 No 1 (2019) Vol 41 No 3 (2018) Vol 41 No 2 (2018) Vol 41 No 1 (2018) Vol 40 No 3 (2017) Vol 40 No 2 (2017) Vol 40 No 1 (2017) Vol 39 No 3 (2016) Vol 39 No 2 (2016) Vol 39 No 1 (2016) Vol 38 No 3 (2015) Vol 38 No 2 (2015) Vol 38 No 1 (2015) Vol 37 No 3 (2014) Vol 37 No 2 (2014) Vol 37 No 1 (2014) Vol 36 No 3 (2013) Vol 36 No 2 (2013) Vol 36 No 1 (2013) Vol 35 No 3 (2012) Vol 35 No 2 (2012) Vol 35 No 1 (2012) Vol 34 No 3 (2011) Vol 34 No 2 (2011) Vol 34 No 1 (2011) Vol 33 No 3 (2010) Vol 33 No 2 (2010) Vol 33 No 1 (2010) Vol 32 No 3 (2009) Vol 32 No 2 (2009) Vol 32 No 1 (2009) Vol 31 No 3 (2008) Vol 31 No 2 (2008) Vol 31 No 1 (2008) Vol 30 No 3 (2007) Vol 30 No 2 (2007) Vol 30 No 1 (2007) Vol 29 No 3 (2006) Vol 29 No 2 (2006) Vol 29 No 1 (2006) Vol 28 No 3 (2005) Vol 28 No 2 (2005) Vol 28 No 1 (2005) Vol 27 No 3 (2004) Vol 27 No 2 (2004) Vol 27 No 1 (2004) Vol 26 No 2 (2003) Vol 26 No 1 (2003) Vol 25 No 3 (2002) Vol 25 No 2 (2002) Vol 25 No 1 (2002) Vol 24 No 2 (2001) Vol 24 No 1 (2001) Vol 23 No 3 (2000) Vol 23 No 2 (2000) Vol 23 No 1 (2000) Vol 22 No 2 (1999) Vol 22 No 1 (1999) Vol 21 No 2 (1998) Vol 21 No 1 (1998) Vol 18 No 2 (1995) Vol 18 No 1 (1995) Vol 17 No 1 (1994) Vol 16 No 1 (1993) Vol 15 No 1 (1992) Vol 14 No 2 (1991) Vol 14 No 1 (1991) Vol 13 No 1 (1990) Vol 12 No 1 (1989) Vol 11 No 1 (1988) Vol 10 No 3 (1987) Vol 10 No 2 (1987) Vol 10 No 1 (1987) Vol 9 No 1 (1986) Vol 8 No 2 (1985) Vol 8 No 1 (1985) Vol 7 No 2 (1984) Vol 7 No 1 (1984) Vol 6 No 1 (1983) Vol 5 No 2 (1982) Vol 5 No 1 (1982) More Issue