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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 5 Documents
 1 
Search results for , issue "Vol 23 No 1 (2000)" : 5 Documents clear
Reducing Uncertainty In Log Analysis Due To Presence Of Heavy-Conductive Minerals In Sendimentary Rocks Bambang Widarsono
Scientific Contributions Oil and Gas Vol 23 No 1 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.1.880

Abstract

Presence of heavy-conductive mineral(s) in formation rocks tends to provide negative influence to some log readings especially the resistivity log. With regard to its function in log analysis, any distortion in resistivity log readings will certainly lead to potential misinterpretation on petrophysical properties such as water saturation (S.) Therefore a method dedicated to minimizing the effect is indeed necessary.This paper presents results of a study on presence of heavy-conductive minerals, distributed in structural form, on resistivity reading. Based on analogy and expansion of a structural clay distribution model, a correction method plus its application procedure have been proposed. Since the method is develop using an approach that is considered valid in general term it is, therefore, conceptually applicable to any field cases as long as its theoretical conditions are met. In order to make application of the method easier it has also been presented in form of nomographs.Application of the method on log analysis of two wells in West Java has proved itself well in which corrections on calculated water saturation have yielded values that are more consistent when compared to production test data. The method is also prepared in a manner that it can be easily integrated into standard log analysis practices.
PRELIMINARY CORE PREPARATION FOR SPECIAL CORE ANALYSIS-GUIDELINES Herlan Adim
Scientific Contributions Oil and Gas Vol 23 No 1 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.1.1077

Abstract

The application of core analysis to provide data for reservoir evaluation is not a new science but has seen continued research activity over along period. Core analysis is complex containing many stages between the reservoir and the final measurements and interpretation. To ensure the data produced is valid, every step along this phase must be handled with equal attention. Recently developed techniques of measuring certain special core analysis of rock formation are being perfected. The objective of this paper is to provide information that will be of practical value to geologists and engineers involved with preliminary core preparation program. Following is a guideline for preliminary special core preparation. The step by step outline presented below is a suggested guideline and, most certainly, modifications and or changes may be made. However, this guideline has been found to be very successful for laboratory works.
HYDROCRAKING OF HEAVY DISTILLATE INTO CLEAN DIESEL OIL USING Ni-Mo/Al2O3 CATALYST A.S. Nasution; E. Jasjfi
Scientific Contributions Oil and Gas Vol 23 No 1 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.1.1078

Abstract

Diesel oil is high pollution fuel and the quality of this fuel must he improved to obtain clean diesel oil Crude oil production and its quality tend to decrease. Light fuel oil demand rate is higher than that of residual fuel. Diesel oil produced in the refineries generally consists of predominantly straight-run diesel oil: however, compounds such as thermally and catalytically cracked diesel oils are sometimes included. The quality of straight-run diesel oil, such as hydrocarbon types and sulfur content, will in general reflect the nature of crude oil. Cracked stocks either thermal or catalytic cracked diesel oils, contain higher percentage of aromatic, olefin and sulfur contents and these cracked diesel products must be hydrogenated prior to rounting to final products. The passage of the Clean Air Act Amendment of 1990 in the U.S.A has forced American refineries to install new facilities to comply with stricter specifications for fuels such as gasoline and diesel oil. Hydrocracking processes are a combination of desulfurization and conversion developed primary to process feeds having a high content of unsaturated hydrocarbons (olefin and polycyclic aromatics) and non-hydrocarbon compounds (sulfur and nitrogen compounds) with a bifunctional catalyst. A variety of bifunctional catalysts and processing designs may be used commercially depending on the feedstock used and desired products. Influence of both feedstock compositions (paraffinic and non-paraffinic vacuum distillate, and wax) and the acidity of bifunctional catalysts on the performance of hydrocracked diesel oil products are discussed briefly in this paper. Low yield or selectivity of diesel oil products by high catalyst acidity, it is suggested that the higher secondary splitting has taken place in converting cracked products into large amounts of low-molecular weight hydrocarbons such as gasoline and LPG. High diesel index product of the paraffinic feedstock due to the high paraffin content of the produced diesel oil.
THE FEASIBILITY OF MICRO-CRYOGENIC TECHNOLOGY APPLICATION FOR ENHANCING DOMESTIC NATURAL GAS UTILIZATION, CASE STUDY : NATURAL GAS PROVISION AT R & D CENTRE FOR OIL AND GAS TECHNOLOGY "LEMIGAS" Yusep K Caryana
Scientific Contributions Oil and Gas Vol 23 No 1 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.1.1079

Abstract

Indonesia with a huge natural gas reserves distributed in various islands and separated by sea has utilized the gas for domestic energy source and petrochemical feedstock purposes. Transportation of the gas to its consumers can be in the form of either pipeline gas or Liquefied Natural Gas (LNG) schemes. Selection of the scheme chosen is determined based on its economic evaluation and technical reliability. The distribution of gas reserves in various islands segmented by sea in Indonesia in combination with economic activity concentration especially in Java island bring about difficulties in gas development due to the up-front massive investment required on gas pipe laying or LNG plant construction. It is therefore required to find a cheaper alternative to the scheme with an established safety standard application, in order that the domestic gas utilization will be able to be enhanced and thus reducing petroleum liquid import. An alternative that can be significantly considered is micro-cryogenic technology development in Indonesia for constructing a low capacity LNG plant so that a small scule of LNG can be economically produced. The LNG is then distributed to gas consumers at regions which has no existing and will not be viable for new gas network installation. Micro-cryogenic technology application is thought to be developed considering a preliminary feasibility study results. The study found that micro-cryogenic technology is around US$ 0,75 million (68,2%) cheaper than gas pipeline technology to provide natural gas for Gas Demonstration Plant operation at R& D Centre for Oil and Gas Technology "Lemigas"
PRECISION OF THE OCTANE NUMBER MEASUREMENT FOR GASOLINE BY PETROLEUM LABORATORIES IN ASEAN COUNTRIES (1999) Bustani Mustafa
Scientific Contributions Oil and Gas Vol 23 No 1 (2000)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.23.1.1080

Abstract

A high precision of octane number measurement according to standard measurement and to standard requirement is a must in the refining industry. The ASEAN Council on Petroleum (ASCOPE) Correlation Programme is conducted to obtain the precision of octane number measurement data for gasoline the normally used methods of ASTM D 2699 and IP 239. This programme is participated by 19 petroleum laboratories in ASEAN Countries. The test results of the various participating laboratories are subjected to statistical analysis to determine their average value, variance, standard deviation, and to rejected the outlier values. The Grubb T-Test method was used for the statistical rejection of outliers. This method appears to be quite satisfactory for ASCOPE purpose. The implementation of the Grubb T-Test ensures the laboratory consistency and this in turn will give the buyers or sellers of the gasoline confidence in the quality of the gasoline This paper presents the results of 26 ASCOPE Laboratories Test Correlation Programme for Octane Number Measurement (1999).

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