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ROCK MASS CLASSIFICATION FOR SEDIMENTARY ROCK MASSES IN INDONESIA COAL MINING AREAS Saptono, Singgih; Yulianto, M. Rahman; Vergiagara, Vega; Sofyan, Herry
Journal TECHNO Vol. 6 No. 1 (2020): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v6i1.4225

The stability of rock slopes is important for the safety of personnel and equipment in the open pit mine. Slope instability and failure occur due to many factors such as adverse slope geometry, geological discontinuities, weak or weathered slope material due to weather influences. External loads such as high rainfall and seismicity could play an important role in slope failure. For this reason, a precise classification of rock mass is needed for the basis of determining technical policy. Rock slopes in open pit coal mining areas, especially in Indonesia, are characterized by applying various rock mass classification systems, such as Rock Mass Rating (RMR) and Geological Strength Index (GSI), because the study area comprises well exposed rock formations. In the RMR system, there are five main parameters viz. Uniaxial Compressive Strength (UCS) of rocks, Rock Quality Designation (RQD), spacing of discontinuity, discontinuity conditions, and groundwater conditions were considered. In this paper, several rock mass classification systems developed for the assessment of rock slope stability were evaluated with the condition of rock slopes in the tropics, especially Indonesian region, particularly in sedimentary rocks in the open pit coal mining area in order to get the corrected GSI equation used to characterize rock slopes based on quantitative analysis of rock mass structure and surface conditions of discontinuities.

PALEOTEMPERATURE INTERPRETATION BASED ON CALCAREOUS NANNOPLANKTON OF KEDUNG SUMBER RIVER SECTION, SOKO, BOJONEGORO, EAST JAVA Choiriah, Siti Umiyatun; Prasetyadi, Carolus; Kapid, Rubiyanto; Yudiantoro, Dwi Fitri; Syaifudin, Muhammad
Journal TECHNO Vol. 6 No. 1 (2020): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v6i1.4226

Analysis of 64 samples taken from the Kedung Sumber River section represent of Kalibeng Formation, Atasangin Member, Klitik Member, Sonde Formation, and Pucangan Formation. The detail of nannoplankton analysis showing that temperature changes influenced to the growth of nannoplankton. Result of this study reveals that a number of 32 zones paleotemperature change. Age of the Kalibeng Formation is Late Miocene to Early Pliocene (NN10-NN13), divided into nine zones: 1/warm, 2/cold, 3/transitional, 4/warm, 5/cold, 6/warm, 7/cold, 8/cold, 9/warm zone. Atasangin Member are divided into 3 zones: 10/cold, 11/warm, 12/cold zone. Age of this member is Early Pliocene (NN13-NN14). Klitik Member is Early Pliocene to Late Pliocene (NN14-NN17), and divided to 7 zones: 13/transitional, 14/warm, 15/cold, 16/warm, 17/cold, 18/warm zone. Age of Sonde Formation is NN18-NN20 (Late Pliocene to Early Pleistocene), have into 7 zones: 19/cold, 20/warm, 21/transitional, 22/cold, 23/transitional, 24/cold, 25/transitional, 26/ cold, 27/transitional zone, 28/warm, 29/cold zone. Pucangan Formation are divided into 3 zones: 30/warm, 31/transitional, 32/cold zone. Age of this formation is Pleistocene (NN20-NN21).

Polymer Injection Modeling in a Solution Gas Drive-Naturally Fractured Reservoir Widiyaningsih, Indah; Helmy, Mia Ferian; Kaesti, Edgie Yuda; Arta, Atma Budi
Journal TECHNO Vol. 7 No. 1 (2021): Mei
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i1.4479

Solution Gas Drive-Naturally Fractured Reservoir (NFR) has relatively high remaining oil reserves. This causes less optimum oil from the reservoir to be produced to the surface, so that it requires an enhanced oil recovery (EOR). EOR can be done by chemical injection, one of which is by polymer injection. Polymer injection emphasizes improving the swept efficiency. The most important parameter in this case is the mobility ratio. The injection process is very dependent on reservoir fluid characteristics, rock heterogeneity, and interactions between fluid and rock. Therefore, studies are needed to understand the mechanism of polymer injection that occurs in the reservoir.Simulation modelling of polymer injection on solution gas drive naturally fractured carbonate reservoir will be done using a black-oil simulator. In the black oil simulator it can be observed changes in the parameters of the mobility ratio of water to oil. In this simulation will run water flooding case as comparison to polymer injection case.The purpose of this study is to observe an increase in recovery factor with water flooding and polymer injection scenario on solution gas drive-NFR. The scenario that provides the greatest recovery factor can be considered in carrying out a strategy to increase oil recovery at EOR methods.

TECHNICAL AND ECONOMICAL EVALUATION FOR ELECTRICAL SUBMERCIBLE PUMP OPTIMAZATION USING VARIETY OF STAGES AND FREQUENCIES AT THE “INTB-12” WELL IN THE WIDURI FIELD Batubara, Reinhard Fredrik; Suranto, Suranto; Ratnaningsih, Dyah Rini
Journal TECHNO Vol. 7 No. 1 (2021): Mei
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i1.4809

Based on the analysis and calculations from daily production reports, there was a decrease in oil production of about 500 barrels of oil per year in the Widuri Field. The output of fluid produced occurred since drilling activities, completion of wells and production. In addition, other problems arise related to production optimization, namely excessive use of electrical energy in electrical submersible pumps, artificial lifts used to produce hydrocarbon fluids in Widuri Field with limited electrical energy capacity. ESP optimization can use VSD, because the ESP pump motor is an induction motor, where the speed is very proportional to the electric power supply. By adjusting the frequency of the ESP motor on the VSD, of course, you will be able to control the operation of the ESP in a wider range of capacity, head, and efficiency, so that you can determine the price of the desired optimum production rate based on 70% - 80% of Qmax. The optimization will be carried out in this research is to replace the ESP type with the number of stages and the number of new frequencies as well as calculating the lifting cost ratio. The purpose and objective of writing this research is to evaluate the volumetric efficiency of the pump that is being installed in the well so that optimization can be done in the study well by doing various ways and calculating the economic of each pump, that it gets the most economical lifting cost price. The method of this paper is the variation of stages and frequencies to get how much% volumetric efficiency, the Pump Discharge (P2) and Pump Intake (P3) methods to optimize the pump in the study well and Oil Lifting Cost for its economy. The conclusion is that you can determine which ESP pump to use based on the oil lifting cost.

THE MOST SHALLOW OIL TRAP IN THE WORLD OF WONOCOLO ANTICLINE AS A BEAUTIFUL EDUCATION OBJECT Setiawan, Jatmika; Kristanto, Dedy; Hariyadi, Hariyadi
Journal TECHNO Vol. 7 No. 1 (2021): Mei
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i1.4847

Wonocolo is located in Bojonegoro District who one of geosite of 20 geosite point to support The Petroleum Geoheritage Bojonegoro. Wonocolo is area’s of Asset-4 Pertamina Cepu. Wonocolo area is a good interesting to develope as Geological Tourism object of old well, because in this area to exploitation of hidrocarbon with tradisional system use car’s mechine and with rig of Jati Threes. The deep of reservoir Wonocolo only about 200-400m from survace. The many rig to explorer hidrocarbon tradisionally, so like in the Texas. So this study to make the Geological Tourism Object of Wonocolo Old Well with economy improvement of Wonocolo Community, Bojonegoro, East Java. Things that can be developed there among other: 1. Tracking get the jeep, tracking trail and tracking a bicycle, 2. Wells pilot; 3. Places beautiful to photograph a selfi, 4. The existence of transit equipped with photographs wonocolo from year to year of fossils, and Wonocolo’s maket, 5. The development of its tourism education in all quarters. This intended to give addition to entrepreneurs mining with the tourism and finally as an alternative income if later oil in wonocolo up.

OIL RESERVES ANALYSIS IN BATANG FIELD WITH MATERIAL BALANCE METHOD FOR PRESSURE MAINTENANCE Winant, Fachri Muhammad; Suranto, Suranto; Swadesi, Boni
Journal TECHNO Vol. 7 No. 1 (2021): Mei
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i1.5287

Material Balance method is a concept of material equilibrium with measurement of response from reservoir (pressure) due to production, injection, and influx activities so that it can calculate the appropriate Original Oil in Place. By creating a material balance model, it can be done the development plan of Batang Field with the aim of obtaining cumulative optimum oil production. Batang Field is still feasible to be developed using pressure maintenance scenarios seen from OOIP of 144.3 MMSTB, Recovery Factor of 14.9% and Current Pressure of 70-80 psi. Pressure Maintenance is a water injection with the aim of replacing the fluid that has been produced so that it is expected to keep the reservoir pressure from falling. Ideally this method requires Voidage Replacement Ratio (VRR) = 1 as the target injection. Economic calculation using Cost Recovery from this scenario shows a positive NVP ($ 2,865,000 USD). Therefore, development projects using Pressure Maintenance can be applied in the field. With this paper, it is hoped that it can increase reserves and lifespan of the Batang oil field.

In Vitro Micro-Cutting Of Vanilla (Vanilla Planifolia Andrews.) In Different Naa And Bap Prabaninggar, Rizki Amalia; Sasmita, Ellen Rosyelina; Wahyurini, Endah
Journal TECHNO Vol. 7 No. 1 (2021): Mei
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i1.5429

Vanilla is one of the spice plant that has a high selling value. The problem with conventional propagation of vanilla by stem cuttings is the attack of stem rot disease caused by Fusarium oxisporum f sp. and limited planting material, therefore can be overcome by tissue culture techniques. This study aims to examine the interaction between the various concentrations of NAA and BAP, obtain the most appropriate concentrations of NAA and BAP for vanilla’s micro-cutting. The study used a Completely Randomized Design (CRD) method. The first factor is the concentration of NAA consisting of N1: 0,5 ppm, N2: 1 ppm, and N3: 1,5 ppm. The second factor is the concentration of BAP consisting of B1: 1 ppm, B2: 2 ppm, and B3: 3 ppm. Observation data were analyzed using Analysis of Variance (ANOVA) and Duncan's Multiple Range Test (DMRT) at 5% level. The results showed that there was no interaction between the treatment of NAA and BAP concentrations on vanilla micro-cutting. The use of 1 ppm NAA gave the best results on root length. BAP at all concentrations gave the same response on parameters of time to grow buds, live percentage, number of shoots, number of roots, number of leaves, root length, and dry weight of plantlets.

Optimal Forecasting of Resources and Production Capacity of the Libyan Iron and Steel Company to Cover Demand for Its Products Azouza, Omar; Naser, Madi; Hassan, Elganidi
Journal TECHNO Vol. 7 No. 1 (2021): Mei
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i1.5430

The Libyan Iron and Steel Company (LISCo) is considered one of the largest industrial companies with capacity is about 1,324,000 tons of liquid steel annually by direct reduction of iron pellets using local natural gas. One of the most difficult problems facing the management is the optimal use of its resources and production capacity needed to cover the volume of demand for its products. In order to meet the needs of its customers in a timely manner and at the lowest possible cost, which requires the use of quantitative techniques as a tool to support and rationalize the economic decision. These problems cannot be solved out of personal judgment. Rather, this requires the use of modern quantitative methods that contribute to making the optimal decision. Among the most important of these are prediction techniques. The importance of the study is represented in forecasting the production capacity and that leads to the optimum utilization of LISC’s resources. The study was carried out first by relying on data and information gathering to review previous studies, research and scientific journals. Secondly, through field visits. Third, apply the equations and laws of demand forecasting of simple linear regression to the data obtained. Fourth, using Microsoft Excel on the data collected. We obtained good results with which we can support the senior management of LISC, with 95% & 99% confidence. We recommended LISC does not control costs, and price and securing a fixed profit margin, in addition to the company bearing additional costs resulting from the creation of interests.

Drain Hole Installation Design in an Open Coal Mine Cahyadi, Tedy Agung; Fadlil, Doni Firdaus; Titisariwati, Indun; Hartono, Hartono; Nursanto, Edy; Ansori, Muhammad Iqbal; Anggoro, Hengky
Journal TECHNO Vol. 7 No. 2 (2021): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i2.5441

The presence of groundwater on the mine slopes can disturb the stability of the slope. High groundwater can increase pore pressure which affects the amount of load on the mine slope. In order to lower the groundwater level, it is necessary to have drainage holes to drain water naturally. This study aims to design a horizontal drain installation so that it can lower the groundwater table. The results of this study indicate the existence of an aquifer in the form of sandstones. In this aquifer horizontal drains will be installed. The results of this study are in the form of horizontal drains installation design, namely, the location of the installation of the horizontal drain, the diameter of the boreholes, the distance between the boreholes, the length of the horizontal drains installation pipe, and the angle of inclination of the installation of the horizontal drains.

RESISTANCE AND POTENTIAL YIELD TEST OF ACCESSION TOMATO DETERMINATE HYBRID (F1) TO TOMATO YELLOW LEAF CURL VIRUS (TYLCV) Sari, Chitia Novita; Lagiman, Lagiman; Wahyurini, Endah
Journal TECHNO Vol. 7 No. 2 (2021): November
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/journal techno.v7i2.6228

This study aimed to determine the resistance and yield of accessionized determinate hybrid tomatoes (F1) against Tomato Yellow Leaf Curl Virus (TYLCV), and to obtain accessions of determinate tomatoes that are resistant to TYLCV and have high yields.This research method used Completely Randomized Design (CRD) to test the resistance of tomato accessions from TYLCV attack. The second stage of the experiment used a Completely Randomized Block Design (CRBD) to test the yield of tomato accession at the tolerance level forTYLCV resistance. The treatments consisted of 7 F1 tomato hybrids, namely T-26, T-41, T-121, T-122, T-165, T-175, T-187, and 3 control hybrid namely T-90, Liontin and Betavila. The data obtained were analyzed using analysis of variance (ANOVA) then followed by DMRT (Duncan's Multiple Range Test) at a significance level of 5%. The results showed that the control hybrid T-90 was resistant and the T-122 hybrid was moderately resistant to TYLCV (Experiments stages I and II). The seven hybrids tested (T-26, T-41, T-121, T-122, T-165, T-175, and T-187) had the same weight of fruits as the TYLCV resistant control hybrid (T-90). The superior hybrids on the parameters of weight of fruits, weight per fruits, number of fruit, and fruit diameter were T-122 and T-175. Hybrid (F1) which has resistance to TYLCV and high yield is T-122.

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Daerah istimewa yogyakarta

INDONESIA