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All Journal KURVATEK Hydrogen: Jurnal Kependidikan Kimia Jurnal Offshore: Oil, Production Facilities, and Renewable Energy Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Jurnal Ekonomi, Teknologi dan Bisnis
Yunita, Lia
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Aerospace Engineering Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Perencanaan Sumur Pengembangan Reservoir Gas “RRD” Berdasarkan Metode Decline Curve Rahmahdani, Ria; Yunita, Lia; Listriyanto, Listriyanto
Jurnal Offshore: Oil, Production Facilities and Renewable Energy Vol. 7 No. 1 (2023): Jurnal Offshore: Oil, Production Facilities and Renewable Energy
Publisher : Proklamasi 45 University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jo.v7i1.1584

Abstract

Reservoir “RRD” mulai dikembangankan pada tahun 2011 di lepas pantai dan sumur ekplorasi yang dilakukan pemboran diberi nama sumur “R-1”. Pada tahun 2013 dilakukannya pengeboran delineasi yairu sumur “R-2” dengan tujuan sumur pengembangan yang direncanakan produksi selama dua puluh lima tahun. Pengerjaan mulai pada tahun 2019 dengan disetujuinya Kontrak Bagi Hasil (PSC). Tujuan penelitian adalah untuk menentukan jumlah sumur pengembangan dengan metode decline curve dalam waktu kontrak dua puluh lima tahun,Metode yang digunakan pehitungan cadangan reservoir gas  motode decline curve dengan menghitung penurunan laju produksi gas sebesar decline 10 % setiap tahun dimulai pada tahun 2024. Jumlah sumur pengembangan dengan laju alir gas 10,37 MMSCF/d, jumlah maksimum cadangan hidrokarbon yang dapat diproduksikan kepermukaan secara komersial 3.214.956 MMSCF selama kurun waktu 25 tahun. Produksi pertama kali dilakukan pada tahun ke-5 yaitu tahun 2024 hingga tahun ke-21 tahun 2040 dengan 7 (tujuh) sumur produksi, terdiri dari 2 (dua) sumur exisiting dan 5 (lima) sumur pengembangan, yang mana jumlah cadangan yang diproduksikan sebesar 3.201.207 MMSCF.
Synthesis of Cellulose Straw and Rice Husk as Raw Materials for Bioplastic Production Hardi, Gilar Wisnu; Dewi, Berlian Kusuma; Toruan, Sari Artauli Lumban; Nurjanah, Suci; Fitriana, Syifa Ayu; Yunita, Lia
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 6 (2024): December 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i6.13795

Abstract

The development of environmentally friendly materials such as bioplastics is a solution to reduce the negative impact of conventional plastics on the environment. This study presents a novel approach by utilizing hemicellulose extracted from rice straw and husks—abundant agricultural waste materials—as the main raw materials for bioplastic production. Hemicellulose was extracted using the alkalization method, and its characterization was carried out through FTIR analysis to identify typical polysaccharide functional groups. The results of the analysis showed the presence of O-H, C-H, and C-O-C groups, which indicate the glycosidic structure of hemicellulose, as well as indications of residual lignin with C=C groups. The resulting hemicellulose was then processed into bioplastics with the addition of plasticizers and reinforcing materials, incorporating glycerin, CMC, and TiO₂ to enhance mechanical properties and biodegradability. Mechanical and degradation tests demonstrated superior performance, highlighting the synergy between these additives. This study provides an innovative strategy for transforming agricultural waste into high-value bioplastics, contributing to sustainability and advancing green material technology.
The Effect of Capital Structure and Profitability on Company Value in the Food and Beverage Sector in Indonesia Yunita, Lia; Ridloah, Siti; Humaira, Hanina
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 3 No. 2 (2024): JETBIS : Journal Of Economics, Technology and Business
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v3i2.91

Abstract

The value of the company has a direct impact on the maximum shareholder prosperity if the company's share price increases and this value also reflects the extent to which the company is recognized by the public. This study aims to examine the effect of capital structure and profitability on firm value. The population of this research is the manufacturing companies in the food and beverage sub-sector which are listed on the Indonesia Stock Exchange for the 2017-2021 period, while the sample is 33 companies using purposive sampling technique, so the number of observations was 165 data. The data analysis method used panel data regression analysis with an analytical tool in the form of Eviews 10. The results of this study indicate that capital structure (DER) has a negative and significant effect on firm value, then profitabily (ROE) has a positive and significant effect on firm value.
The Effect of Capital Structure and Profitability on Company Value in the Food and Beverage Sector in Indonesia Yunita, Lia; Ridloah, Siti; Humaira, Hanina
Jurnal Ekonomi Teknologi dan Bisnis (JETBIS) Vol. 3 No. 2 (2024): Jurnal Ekonomi, Teknologi dan Bisnis
Publisher : Al-Makki Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57185/jetbis.v3i2.91

Abstract

The value of the company has a direct impact on the maximum shareholder prosperity if the company's share price increases and this value also reflects the extent to which the company is recognized by the public. This study aims to examine the effect of capital structure and profitability on firm value. The population of this research is the manufacturing companies in the food and beverage sub-sector which are listed on the Indonesia Stock Exchange for the 2017-2021 period, while the sample is 33 companies using purposive sampling technique, so the number of observations was 165 data. The data analysis method used panel data regression analysis with an analytical tool in the form of Eviews 10. The results of this study indicate that capital structure (DER) has a negative and significant effect on firm value, then profitabily (ROE) has a positive and significant effect on firm value.
Synthesis of Cellulose Straw and Rice Husk as Raw Materials for Bioplastic Production Hardi, Gilar Wisnu; Dewi, Berlian Kusuma; Toruan, Sari Artauli Lumban; Nurjanah, Suci; Fitriana, Syifa Ayu; Yunita, Lia
Hydrogen: Jurnal Kependidikan Kimia Vol. 12 No. 6 (2024): December 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i6.13795

Abstract

The development of environmentally friendly materials such as bioplastics is a solution to reduce the negative impact of conventional plastics on the environment. This study presents a novel approach by utilizing hemicellulose extracted from rice straw and husks—abundant agricultural waste materials—as the main raw materials for bioplastic production. Hemicellulose was extracted using the alkalization method, and its characterization was carried out through FTIR analysis to identify typical polysaccharide functional groups. The results of the analysis showed the presence of O-H, C-H, and C-O-C groups, which indicate the glycosidic structure of hemicellulose, as well as indications of residual lignin with C=C groups. The resulting hemicellulose was then processed into bioplastics with the addition of plasticizers and reinforcing materials, incorporating glycerin, CMC, and TiO₂ to enhance mechanical properties and biodegradability. Mechanical and degradation tests demonstrated superior performance, highlighting the synergy between these additives. This study provides an innovative strategy for transforming agricultural waste into high-value bioplastics, contributing to sustainability and advancing green material technology.
Penentuan Rock Region berdasarkan Porositas dan Permebilitas Batuan dalam Simulasi Reservoir Migas Yunita, Lia
Retii 2024: Prosiding Seminar Nasional ReTII ke-19 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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

Abstract

Before carrying out a reservoir simulation, porosity and permeability analysis is very important to understand the physical characteristics of the reservoir rock. Determination of these parameters helps identify the production capacity and fluid distribution in the reservoir. Correlation of core data with log data and stratigraphic simulations can provide more accurate predictions about the distribution of porosity and permeability in heterogeneous fields. Core data obtained through SCAL (Special Core Analysis) and RCAL (Routune Core Analysis) is processed into rock regions to group good and bad rock characteristics. The aim of this research is to determine rock regions based on rock permeability porosity. The method used with SCAL and RCAL analysis includes porosity, core depth permeability. After that, determine the FZI (Flow Zone Index) value obtained from the RQI (Reservoir Rock Quality Index) data divided by the NPI (Normalized Porosity Index). Then find the cumulative probability value by dividing the core sample number by the total sample number. The RQI value is obtained through permability and effective porosity data, while the NPI is obtained through porosity data. The results of research on the "ZN" formation obtained plotting between the porosity and permeability of rocks which have six rock regions based on porosity and permeability data obtained through SCAL and RCAL
SQUEEZE CEMENTING PLANNING USING BALANCE PLUG METHOD IN LOSS FORMATION ON “TBN-10” Prasetyo, Wahyu; Yunita, Lia
KURVATEK Vol 10 No 2 (2025): Energy Management and Sustainable Environment
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v10i2.6246

Abstract

The TBN-10 well in the subang field is a production well that has experienced a decline in productivity, so it was decided to close the perforation zone in layer 9C using the squeeze cementing method and open a new perforation in layer 9D. This work faces challenges in the form of a loss circulation zone in the baturaja formation, so it is necessary to plan the appropriate cement method and composition. The squeeze cementing method is carried out using the balance plug method, accompanied by the selection of class G cement and special additives such as BAF-14L, BAR-19L, BAL-22L, BAG-17L, and BAF-26L to overcome high pressure conditions, high temperatures, and potential gas disturbances and fluid loss. The calculation of slurry volume, water head, water behind, displacement, and slurry specifications was carried out in detail resulting in a slurry requirement of 15.10 bbl. Laboratory test results showed a thickening time value of 4 hours 29 minutes at a consistency of 100 Bc and a compressive strength of 623 psi in 24 hours. Field evaluation showed that the cementing work successfully formed good isolation on the old perforation zone and allowed the opening of a new, more productive zone. This work successfully repaired the well integrity and became the basis for a workover strategy with a target of significantly increasing production from more economical layers.
Penentuan Kurva Tekanan Kapiler Menggunakan Metode Buckley Laverett: Pendekatan Pengolahan Data untuk Aplikasi Simulasi Reservoir Yunita, Lia
Retii 2025: Prosiding Seminar Nasional ReTII ke-20 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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

Abstract

Tekanan kapiler memegang peran penting dalam menentukan distribusi dan mobilitas fluida di dalam pori batuan. Hubungan antara tekanan kapiler, kejenuhan fluida, serta permeabilitas relatif menjadi dasar dalam memahami dinamika perpindahan fluida pada media berpori. Tujuan penelitian ini mengembangkan pendekatan pengolahan data berbasis model matematis Buckley Laverett untuk mentransformasikan data saturasi dan tekanan menjadi kurva tekanan kapiler yang dapat digunakan sebagai input dalam simulasi numerik reservoir. Metode yang digunakan pengolahan data transformasi data special core analysis dari laboratorium menjadi model tekanan kapiler menggunakan pendekatan matematis Buckley Laverett yang dapat diaplikasikan langsung pada simulasi reservoir. Hasil analisis tekanan kapiler pada dua rock region membuktikan bahwa tekanan kapiler berkurang secara eksponensial seiring meningkatnya saturasi air, dengan nilai yang lebih rendah pada batuan berporositas dan permeabilitas tinggi. Melalui pendekatan ini, diperoleh kurva tekanan kapiler yang mampu menggambarkan hubungan fisik antara gaya antarmuka fluida dengan sifat batuan, serta dapat digunakan sebagai input valid dalam simulasi reservoir.
Co-Authors Dewi, Berlian Kusuma Fitriana, Syifa Ayu Hardi, Gilar Wisnu Humaira, Hanina Listriyanto, Listriyanto Nurjanah, Suci Rahmahdani, Ria Siti Ridloah Toruan, Sari Artauli Lumban Wahyu Prasetyo