bluuebunny/crossref_metadata_2025_split huggingface dataset:
Keragaan Karakter Agronomi Padi Hibrida Baru
Authors: Kartina Nita , Widyastuti Yuni , Satoto NFN 
Published: February 2017

<p>Agronomic Characters of New Hybrid Rice. Nita Kartina, Yuni Widyastuti, and Satoto. Hybrid rice is the F1 generation derived from the crossing between cytolasmic genetic male sterile and restorer as two parental line. Development of hybrid rice technology obtained throught heterosis This research has the aim was to assess the agronomy characters of some new hybrid rice. Four hundred of Indonesia Center of Rice Research (ICRR) new hybrids rice selected based on yield and phenotipic performances. The activitity conducted in Sukamandi field West Java Province in wet season 2012. The research was arranged in an augmented design that divided in to seven blocks. Each block consist of 20 hybrid rice and five check such as Mapan P.05, Inpari 13, Dodokan, Ciherang, and Hipa 8. There are fourteen hybrids rice showed good agronomic characters and has higher heterosis standard than Ciherang and Hipa 8. Four hybrid rice combinations give the result that significantly different than Ciherang (5.59 t/ha) as check variety. Those hybrids are GMJ11/CRS777 (9.1 t/ha), GMJ12/CRS707 (7.6 t/ha), GMJ13/CRS703 (8.7 t/ha), and GMJ12/CRS795 (7.95 t/ha).</p><p> </p><p><strong>Abstrak</strong></p><p>Padi hibrida merupakan generasi F1 hasil persilangan antara galur mandul jantan sebagai tetua betina dan galur pemulih kesuburan sebagai tetua jantan. Teknologi padi hibrida dihasilkan melalui pemanfaatan heterosis. Penelitian ini bertujuan untuk mengkaji keragaan agronomi sejumlah padi hibrida baru. Sebanyak 400 padi hibrida baru rakitan Balai Besar Penelitian Tanaman Padi diseleksi berdasarkan daya hasil dan penampilan fenotipik di lapangan menggunakan analisis augmented. Penelitian dilakukan di Kebun Percobaan Sukamandi, Jawa Barat, pada MT II tahun 2012 menggunakan lima varietas kontrol, yaitu Mapan P.05, Inpari 13, Dodokan, Ciherang dan Hipa 8 yang ditanam berulang pada tujuh blok dan tiap blok terdiri dari 20 kombinasi padi hibrida. Diperoleh 14 kombinasi padi hibrida yang menunjukkan keragaan yang lebih baik dan memiliki standar heterosis lebih tinggi dari varietas kontrol Ciherang dan Hipa 8. Empat kombinasi hibrida memberikan hasil yang nyata lebih tinggi dibanding Ciherang sebagai varietas pembanding dengan hasil (5,59 t/ha), hibrida tersebut adalah GMJ11/CRS777 (9,1 t/ha), GMJ12/CRS707 (7,6 t/ha), GMJ13/CRS703 (8,7 t/ha), dan GMJ12/CRS795 (7,95 t/ha).</p>
Autekologi Damar Asam Shorea hopeifolia (F. Heim) Symington di Taman Nasional Bukit Barisan Selatan, Lampung
Authors: Wardani Marfuah , Heriyanto Nur M. 
Published: February 2017

<p>Autecological research of Shorea hopeifolia (F. Heim) Symington was done at Resort Pemerihan, National Park of South Bukit Barisan, Lampung in November 2014. The data was collected using a square plot of 20 m x 20 m, number of sample units made was three plots and each plot was made to four subplots with the distance of 50 m between the subplots, distance between the plots was 2,000 m. The results showed that S. hopeifolia was found at altitudes above 260 m asl, alongside of the hill with a rather steep topography and groups. Vegetation encountered in the surrounding consisted of Dipterocarpus kunstleri King. with IVI of 28.89%, Shorea ovalis Blume with IVI of 18.83% and Lithocarpus elegans Blume with IVI of 15.06%. The physical environment temperature was between 25&amp;ndash;35&amp;deg;C, humidity was between 52&amp;ndash;76%, slope was between 15&amp;ndash;65%, and altitude from sea level was between 276 to 350 m. D. kunstleri King. associated with the most powerful S. hopeifolia (close to 1) Ochiai index of 0.81, followed by S. ovalis Blume Ochiai index of 0.65 and Dillenia excelsa (Jack) Gilg. Ochiai index 0.52. Natural regeneration was assisted by wildlife especially hornbill (Buceros rhinoceros) and the flow of rain water.</p><p> </p><p><strong>Abstrak</strong></p><p>Penelitian autekologi damar asam (Shorea hopeifolia (F. Heim) Symington) telah dilakukan di Resort Pemerihan, Taman Nasional Bukit Barisan Selatan, Lampung pada bulan November 2014. Pengumpulan data menggunakan plot bujur sangkar ukuran 20 m x 20 m, jumlah satuan contoh yang dibuat tiga plot dan masing-masing plot dibuat 4 subplot dengan jarak antarsubplot 50 m, jarak antarplot 2.000 m. Hasil penelitian menunjukkan bahwa damar asam dijumpai pada ketinggian tempat di atas 260 m dpl, di pinggir bukit dengan topografi agak curam dan berkelompok. Vegetasi di sekitarnya yang dijumpai adalah kruing (Dipterocarpus kunstleri King.) dengan INP sebesar 28,89%, meranti merah (Shorea ovalis Blume) INP = 18,83%, dan Lithocarpus elegans Blume dengan INP = 15,06%. Lingkungan fisik suhu antara 25&amp;ndash;35&amp;deg;C, kelembaban udara antara 52&amp;ndash;76%, kemiringan lahan antara 15&amp;ndash;65% dan ketinggian tempat dari permukaan laut antara 276 sampai 350 m. Jenis kruing (D. kunstleri King.) berasosiasi dengan damar asam paling kuat (mendekati 1) indeks Ochiai 0,81 diikuti meranti merah (S. ovalis Blume) indeks Ochiai 0,65 dan sempur Dillenia excelsa (Jack) Gilg. indeks Ochiai 0,52. Regenerasi alami dibantu oleh satwa liar terutama burung rangkong (Buceros rhinoceros) dan aliran air hujan.</p>
KERAGAMAN SUMBERDAYA GENETIK TANAMAN BUAH-BUAHAN EKSOTIK DI KABUPATEN BINTAN PROVINSI KEPULAUAN RIAU
Authors: Dahono Dahono , Zurriyati Yayu 
Published: February 2017

<p>Indonesia memiliki sumberdaya genetik (SDG) buah-buahan tropis yang sangat beragam. Tercatat lebih dari 400 jenis tanaman buah-buahan yang dapat dimakan terdapat di wilayah Indonesia. termasuk buah eksotik tropis. Saat ini sebagian besar SDG lokal tersebut belum terinventarisasi dan teridentifikasi dengan baik sehingga informasi yang didapatkan sangat terbatas. Tujuan kegiatan ini adalah untuk mendapatkan data dan informasi tingkat keragaman SDG tanaman buah eksotik dan potensi pemanfaatannya. Kegiatan dilaksanakan pada empat kecamatan di Kabupaten Bintan yaitu Kecamatan Teluk Sebong, Teluk Bintan, Sri Kuala Lobam dan Toapaya, Provinsi Kepulauan Riau dengan metode survey melibatkan 20 responden yang dipilih secara <em>purposive random sampling</em> dan observasi lapangan. Tanaman buah eksotik diinventarisasi berasal dari lahan pekarangan dan lahan di luar pekarangan milik responden.<strong> </strong>Data yang dkumpulkan meliputi lokasi tempat ditemukannya SDG tanaman buah eksotik mencakup nama desa/dusun dan titik koordinat (LU/LS, BT/BB), jenis tanaman dan deskripsi morfologi utama. Data yang didapat selanjutnya ditabulasi dan dianalisis secara deskriptif. Hasil kegiatan menunjukkan bahwa, sumberdaya genetik (SDG) tanaman buah-buahan eksotik di Kabupaten Bintan cukup bervariasi dan telah dideskripsikan berdasarkan karakteristik morfologi utamanya. Terdapat tujuh jenis tanaman buah eksotik di Kabupaten Bintan, yaitu Buah Rokam (<em>Flacourtia rukam)</em>, Namnam (<em>Cynometra cauliflora</em>), Jeruk Kunci <em>(Citrus </em><em>amblycarpa</em><em>)</em>, Sawo kecek (<em>Pouteria caimito</em>), Lobi-lobi (<em>Flacourtia inermis</em>), Durian Daun (<em>Durio zibethinus L</em>), dan Jamblang (<em>Syzigium cumini</em>).</p>
Water Base Barite Filter Cake Removal Using Non-Corrosive Agents
Authors: Ba Geri B. S. , Mahmoud M. , Al-Majed A. A. , Al-Mutairi S. H. , Abdulazeez A. , Shawabkeh R. 
Published: February 2017

Abstract
Barite is one of the most common weighting materials used in drilling fluid for deep oil and gas wells. Consequently, the main source of solids building the filter cake is the weighting material used in drilling fluids ‘Barite particles’. Barite is insoluble in water and acids such as HCl, formic, citric, and acetic acids, as well as the barite has low solubility in chelating agent such as Ethylene Diamine Tetra acetic Acid (EDTA) and Hydroxyethyl Ethylene Diamine Tri Acetic (HEDTA).
The present study introduces a new formulation to dissolve the barite filter cake using two types of treatments. The removal treatment consiting EDTA or HEDTA plus converting catalyst. The removal formulation also contains polymer breaker (Enzyme). Solubility tests conducted using industrial barite particles with size ranged from 30 to 60 micron. The solubility experiments were carried at 200 °F for 24 hours. Different concentrations of catalyst were added to select the optimum concentration. The designed formulation was examined to remove filter cake formed by Barite drilling fluid using High Pressure High Temperature cell (HPHT).
The result of this study showed that the barite filter removal efficiency of new formulation reached to 90 %. The solubility test results presented that the solubility of barite particles in 20 wt. % EDTA was 60 % in 24 hours at 200 °F. Adding one of the catalyst the solution increased the solubility of barite to 85 %. The second treatment with HEDTA perform 60% removal efficiency in the presence of catalyst. The used treatments were not compatible with the polymer breaker (Enzyme) so the filter cake removal must be two stages. The first stage using 10 wt. % enzyme for 24 hours to break the polymer and the second stage using the designed barite formulation.
The investigated formulation that effectively dissolve the barite will change the industrial direction to use the barite as weighting agent because dissolving barite was the most significant limitation of using barite in the drilling fluid.
Dual Parallel Simultaneous Injection and Production SIP Completion in Single Wellbore Reduces Development Costs and Accelerates Production
Authors: Anthony E. , Kaushik P. 
Published: February 2017

Abstract
In Kuwait, the traditional approach to Field Development has been to drill wells, whether Vertical or Horizontal, Single or Dual, with completions dedicated to either Production or Injection. However, as increasingly more wells are being drilled to develop the stacked reservoirs, surface infrastructure is growing in complexity with regard to Production Flowline routing, Gathering Facility location, Satellite Manifold placement, Water Injection distribution lines routing, and access road construction. Also, since the reservoir stack is a combination of areally extensive Carbonates overlying shale & channel sand sequences, optimum surface locations of Injectors for one reservoir is now increasingly conflicting with the optimum surface locations for the Producer of another reservoir.
The North Kuwait team presented options that could reduce the requirement for excessive wellbores for both new Producers and Injectors. One of which is the utilization of a single wellbore to both Produce Oil from one reservoir and Inject Water into another reservoir simultaneously. This novel approach utilized the most popular Dual Completion equipment, but rather than produce or inject concurrently from separate reservoirs or layers, production & injection are achieved simultaneously through either tubing string. Tubing movement calculations were made to ensure that the resultant axial tubing forces exerted by simultaneously injecting cold water and producing hot reservoir fluid would not cause the Dual packer to prematurely unset.
This unique completion has several advantages which include the production acceleration from an adjacent reservoir/layer that would have been postponed for the life of the Injector and the elimination of the drilling of a new producer to access the oil from an adjacent reservoir/layer to the target injection zone. Additionally, the elimination of the drilling of an Injector well if its optimum subsurface location is close to, or coincides with, an existing Producer from an adjacent layer, and the reduction in access road construction and location preparation costs. This strategy will significantly reduce Unit Development Costs while concurrently ramping up production levels. With simple conversion workovers, rather than drilling new wells, Oil Production potential that is presently unexploited in dedicated Injector wells can immediately be realized. Pressure support Injection can be initiated as soon as distribution injection lines are made available via similar conversion workovers.
Wellbore Stability Evaluation for Mishrif Formation
Authors: Alkamil Ethar H. , Abbood Husam R. , Flori Ralph E. , Eckert Andreas 
Published: February 2017

Abstract
During drilling operations for the E oilfield in the Mishrif formation in southern Iraq, stuck pipe has been identified as a significant geomechanical problem for several wells. In this study, a 1-D mechanical earth model (MEM) of the Mishrif formation is compiled based on its state of stress and rock strength parameters and is utilized to assess the contribution of borehole collapse leading to the stuck pipe problems.
The MEM model is based on the principal in situ stresses and their orientation obtained from wireline logs measurements, measuring while drilling (MWD), and leak off test (LOT). Rock strength properties are obtained from empirical equations and extended leak off tests. The in situ stresses are transformed to calculate and analyze mud pressure conditions for all wellbore azimuths and inclinations. Two different failure criteria (the Mohr-Coulomb and Mogi-Coulomb rock failure criteria) are used in order to determine feasible drilling trajectories (with respect to the σH orientation) and mud pressure conditions for several wells.
This work was conducted to study the behavior of the collapse pressure for Mishrif formation under a normal faulting (NF) in situ stress regime. The results of this study show that wells characterized by stuck pipe are drilled along azimuths which promote wellbore collapse. Based on the MEM results, the mud pressure window is calculated, and stable azimuths and inclinations for each well are suggested. If a specific azimuth for a well cannot be altered, an optimum inclination is recommended to reduce the severity of the borehole collapse. This study based on a 1-D MEM model for directional drilling can improve the well drilling efficiency by reducing non-productive time due to the wellbore instability.
Toward Determining Interfacial Tension at Reservoir Conditions Based on Dead Oil Measurements
Authors: Sauerer Bastian , Stukan Mikhail , Abdallah Wael , Buiting Jan 
Published: February 2017

Abstract
Measurements of interfacial tension (IFT) can be an aid in the planning and execution of secondary and tertiary oil recovery programs. Given the strong influence of temperature, pressure, and oil composition on IFT, it is necessary to determine IFT under reservoir conditions. Unfortunately, measurements at reservoir conditions are tedious and costly, so results of measurements on dead oil are often used instead. Therefore, it is desirable to develop a method for computing the live oil IFT from measurements on dead oil.
To investigate the correlation between live oil and dead oil IFT, IFT of the original reservoir live oil against deionized water was measured ata variety of pressures and temperatures using the pendant drop technique.
Isothermal depressurization simulates the phase behavior of a reservoir fluid in the production scenario. Comparable to the pressure depletion in a reservoir over the time of its production, this work demonstrates the change in IFT related to the drop of pressure and the concomitant release of gas previously dissolved in the oil. The main trend observed was thelineardecrease of IFT during isothermal depressurization at reservoir temperature, with resulting gas release and thus, compositional change.
We describe our findings about the effect of thermodynamic conditions on the oil-water IFT. The results presented are a proof of principle for establishing a broad correlation between IFT measurements performed at the surface on dead oil and water and the more relevant IFT of live oil and water at reservoir conditions. Such a correlation could be used by reservoir engineers to compute recovery rates and thereby plan or modify secondary and tertiary production programs.
A Non-Damaging Fracturing Fluid System for High-Temperature Unconventional Formations
Authors: Liang Feng , Li Leiming , Al-Muntasheri Ghaithan A. 
Published: February 2017

Abstract
Many fracturing fluids are based on guar and guar derivatives, primarily because of their abundance and capability to operate at relatively high temperatures when formulated at high pH. However, insoluble residue in guar can damage permeability especially in unconventional formations. Another issue for applying guar-based fluids at high pH is the tendency to form scales with divalent ions. The fluid cost can also be strongly influenced by the volatility of the guar price. A third disadvantage is their low thermal stability when the temperature exceeds around 350 ° F.
To mitigate these operating issues, a low- or non-damaging, high-temperature fluid system without elevated fluid pH is therefore highly desirable. Thermally stable synthetic polymers such as acrylamide-based polymers and copolymers are considered to be low-residue to residue-free. However, acrylamide polymers at high doses may still cause formation damage in circumstances like incomplete degradation. This paper demonstrates the successful application of a specific acrylamide copolymer to formulate a novel low-loading, non-damaging fracturing fluid system that fulfilled high viscosity requirements over a temperature range from 280 to 450°F.
The fracturing fluid system based on the novel acrylamide copolymer demonstrated superior viscosity performance and excellent thermal stability at high temperatures at 450°F or higher. In one example, at the polymer loading as low as 20 lbm/1,000 gallons, the fluid viscosity stayed above 500cP (at 40 s−1 shear rate) at 300°F for about 2.5 hours. In another example, at a polymer loading of 30 pptg, the fluid viscosity stayed above 500cP (at 40 s−1 shear rate) at 400°F for about 1.5 hours. This data indicates that the fluid system has sufficient proppant suspension capability. The fluids could be efficiently broken to allow for good cleanup using oxidative breakers. Proppant-pack conductivity tests showed good regained permeability of over 90% at 300°F, proving the low- to non-damaging potential of the fluid system to formations treated. Moreover, the low-loading fluid system also reduced the fluid cost by about 50% when compared with the commercially available systems with similar viscosity performance. Using the novel low-loading, residue-free acrylamide copolymer has therefore rendered better cleanup, reduced formation damage, lowered operating cost, and enhanced production rates.
The fracturing fluid system based on the novel acrylamide copolymer has demonstrated the unprecedented combination of a number of advantages including low polymer loading, robust high-temperature performance, high regained permeability, low scaling tendency, and reduced operating cost.
In-Situ Wettability Evaluation of Dynamic Water Flooding of Carbonate Rocks Based on NMR-T2 Distribution
Authors: Valori Andrea , Ali Farhan , Abdallah Wael 
Published: February 2017

Abstract
Recovery mechanism due to brine injection (Dynamic Water, Low Salinity, etc.) in carbonate remains a point of discussion and widely open for research. As wettability alteration is heavily suggested as the main driver for recovery, this study focuses on the in-situ evaluation of wettability alteration due to multiple successive dynamic water flooding of carbonate cores plugs.
Five different core flooding with Nuclear Magnetic Resonance (NMR) T2 monitoring were performed on three different carbonate core plugs. These plugs were fully characterized in terms of petrophysical parameters and petrography. NMR T2 measurements were performed throughout the core flooding experiment including the heat up, brine injection, soaking and cooling down.
Initial results on two samples that are of similar T2 distribution showed relatively different irreducible water saturation (10.7 and 14.9 %) after centrifugation and an NMR T2 inverted wettability after ageing of (-0.15 and -0.04). in the first case, the core was flooded with Gulf sea water. NMR showed clear trend towards increasing water wetness as a result of subjecting the cores with soaking periods, this accompanied with a clear additional recovery following the soaking. In the second case, the core was flooded with Gulf sea water followed by 10 times diluted sea water. Despite a high similarity with the previous core plug, recovery with sea water flooding alone resulted in 57% recovery without further recovery when the other brines were injected. In this case, where most of the effects seems to be happening during the first flooding, NMR, consistently with the production data, did not detect any clear wettability change during the soaking periods.
The results clearly indicate, for the first time, an in-situ wettability alteration due to Dynamic Water injection as demonstrated by NMR T2 distribution analysis.
A New Analytical Procedure to Estimate Interlayer Cross-Flow Rates in Layered-Reservoir Systems Using Pressure-Transient Data
Authors: Nooruddin H. A. , Rahman N. M. 
Published: February 2017

Abstract
We present a new procedure to estimate analytically, from pressure-transient responses, inter-reservoir crossflow rates in multilayer systems separated by tight geological layers, streaks, or baffles. A reservoir system with two neighboring layers, reffered to throughout this study as the tested and the adjacent layers, separated by a semi-permeable barrier, is considered. As production from the tested layer causes a sustained pressure differential across the interface of these poorly-connected layers, prompting fluids to cross flow from the adjacent to the tested layer. For such flow mechanisms, an analytical method is presented to diagnose the conditions of cross flow, characterize the flow barrier, and to quantify the rate of cross flow from transient-pressure data.
Pressure-derivative plots are utilized in diagnosing cross flow between the layers. By matching the test data with the model output, the barrier and the layer parameters are confirmed. The magnitude of the specific barrier permeability and the layer properties are used to compute the cross-flow rate profile as a function of time.
Both the interface of the flow area and the pressure differential at that interface between the layers grow with time for a given magnitude of the specific barrier permeability (Fcb). This is also true for the cross-flow rates. At certain late times, the magnitudes of the pressure drops and cross flow rates attain and maintain their respective plateaus in infinite systems. This also implies that the cross-flow rate grows to a maximum value at some point in time. It is observed that the maximum possible cross-flow rate depends on the ratio of the reservoir flow capacity of the adjacent layer to that of the total reservoir system, comprising both layers. Pressure-derivative versus elapsed time plots are used to determine the onset of cross flow from the adjacent layer, which are impressively supplemented by the respective profiles of the calculated cross-flow rates with time. Field application of the new procedure is illustrated with actual data.