bluuebunny/crossref_metadata_2025_split huggingface dataset:
CITRA PERUSAHAAN SEBAGAI VARIABEL PEMODERASI PENGARUH LAYANAN TERHADAP KEPUASAN PASIEN DAN NIAT BERALIH
Authors: Zakiy Muhammad 
Published: April 2019

This study aims to see the effect of service quality from 3 PKU Muhammadiyah Hospital in Jogja, Sleman and Bantul on customer satisfaction and customer switching intention which is moderated by the company's image. This study uses Moderated Regression Analysis (MRA), with a total sample of 111 customers/patients at the Muhammadiyah Yogyakarta Hospital. The data was collected online and offline by purposive sampling technique. This study proves that service quality is the main predictor in increasing customer satisfaction of PKU Muhammadiyah Yogyakarta hospital. However, the test results explain that the company's image is not able to moderate the influence of service quality on the customer satisfaction and switching intention. The results of this study also provide theoretical and practical contributions related to theoretical, methodological and practical issues.
Production d’hydrogène par procédés biologiques
Authors: Menia Sabah , Nouicer Ilyés , Bakouri Yasmina , M’raoui Abdelhamid , Tebibel Hammou , Khellaf Abdallah 
Published: April 2019

L’hydrogène, s’il est produit à partir de matières premières renouvelables, est une source alternative viable pour remplacer les combustibles fossiles conventionnels en raison de son potentiel énergétique élevé (122 kJ/g). Quand l’hydrogène est utilisé comme carburant, son principal produit de combustion est l’eau, qui peut être recyclée pour produire plus d’hydrogène, mais contrairement aux combustibles fossiles, l’hydrogène n’est pas facilement disponible dans la nature et les méthodes de production couramment utilisées sont assez coûteuses. Actuellement, environ 98 % de l’hydrogène provient des combustibles fossiles. Globalement, 40 % de l’hydrogène est produit à partir de gaz naturel ou de reformage à la vapeur d’hydrocarbures, 30 % à partir de pétrole, 18 % à partir de charbon et 4 % partir d’électrolyse de l’eau. Cependant, ces processus sont coûteux et pas toujours respectueux de l’environnement. Les procédés biologiques pour la production d’hydrogène peuvent fonctionner dans des conditions opératoires moins énergivores et plus respectueuses de l’environnement par rapport aux méthodes chimiques conventionnelles. Cette approche est non seulement écologique, mais ouvre aussi de nouvelles voies pour l’exploitation de ressources énergétiques renouvelables illimitées. En outre, ils peuvent également utiliser différents déchets, ce qui facilite le recyclage des déchets. La production d’hydrogène biologique utilisant la biomasse riche en hydrates de carbone comme ressource renouvelable est l’une des différentes méthodes dans lesquelles les processus peuvent se produire via un processus anaérobie et un processus de photosynthèse. Dans cet article, les différents procédés biologiques de production de l’hydrogène sont décrits et comparés.
Innovative Autonomous Maritime ISO-Container Vehicles AMISOC Vehicles
Authors: Whang James S. 
Published: April 2019

Abstract
The maritime world has been facing difficulty "last mile" logistic dilemmas of natural/manmade access barriers, lack of infrastructure, shallow waters, elevated sea states, adverse weather conditions (e.g., storms, foggy/misty, lightlessness, windy, stormy, or icy/snowy), unknown bathymetry, etc. The industries facing such dilemma have included (1) offshore petroleum exploration/production; (2) offshore mining other than petroleum; (3) marine pollution abatement; (4) humanitarian assistance/disaster relief (HA/DR); (5) offshore firefighting and search and rescue (SAR); (6) offshore energy generation, storage and transmission; and (7) military sectors. A new breed of Autonomous Maritime ISO-Container Vehicles (AMISOC Vehicles) has been invented for effectively solving the above decade-old "last mile" logistic dilemmas. Another dilemma also facing the maritime industries is the ship-to-ship, ship-to-platform or platform-to-ship transfer of cargos at sea. These cargo transfer operations at sea are expensive, difficult to perform and risky which have plagued reliable, efficient and cost-effective sustainment of offshore petroleum exploration/production platforms under adverse weather periods and/or at elevated sea states (e.g., &gt;3+). To be more fully presented in this paper hereinafter, unique and innovative autonomous/unmanned vehicles that are container-box based (or AMISOC vehicles) and their companion technology known as in-situ launch and recovery devices (LRDs) (remotely controllable) have been invented to inexpensively and reliably solve the above critical maritime dilemmas offshore.
Design and Experimental Study of New-Type Supercritical Steam and Flue Gas Generator for Offshore Oilfield
Authors: Liu Yigang , Zou Jian , Han Xiaodong , Wang Qiuxia , Zhang Hua , Liu Hao , Wang Hongyu , Wu Wenwei , Wang Cheng 
Published: April 2019

Abstract
Steam and flue gas stimulation technology has been applied for heavy oil exploitation in Bohai Oilfield for almost ten years. For the special fuel and water requirement of the current thermal generator, large amount of diesel and desalinated seawater are needed during the thermal injection process. Besides, treatment of the produced oily wastewater on the platform becomes more difficult as the oil output increases.
Aimed at solving the existing problems and taking the advantage of characteristics of the supercritical water, a new type of supercritical steam and flue gas generator for offshore oilfield is proposed and studied. The newly proposed generator is mainly consisted of two sections, which are the supercritical water gasification reactor and combustion reactor, respectively. The produced oily wastewater could be directly used for steam generation. A series of experiments are carried out for its feasibility research and structure optimization.
A prototype of the generator is made for indoor experiment. During the gasification process, wastewater and the organic material mixed inside is placed in the supercritical conditions in the gasification reactor whose temperature and pressure are about 600-700°C and 23MPa, respectively. And the reaction product would be mainly H2, CO2 and water. Gasification Experiments of both the diesel and oily wastewater are conducted. And the combustion experiment is also conducted and the gasified gas is reacted with O2 under conditions of 25MPa and 500-550°C. Composition of the produced fluid in each experiments are analyzed. Besides, the structure of the generator is also designed and optimized for improving its working efficiency.
The proposed new-type supercritical steam and flue gas generator has the characteristics of high efficiency, waste water treatment and higher temperature and pressure delivery capacity. And there would be a promising perspective for its application on offshore platform.
Innovative Epoxy Resin Formulation
Authors: Alanqari Khawlah , Al-Yami Abdullah , Wagle Vikrant , Al-Jubran Mohammed 
Published: April 2019

Polymer resin systems have many advantages over conventional cement. Since resins are solids free, they can be used in low injectivity zones such as narrow fractures where conventional cement cannot be pumped. In order to ensure successful field applications of resin systems, downhole temperature must be checked. The objective of this paper is to introduce a high temprarure resin system compared to conventional ones, evaluate the stability of epoxy resin formulation at high temperatures and identify the optimum temperature for successful application.
Despite the many advantages of polymer resins, they have few limitations that can affect their performance and the success. One important limitation of resins is temperature sensitivity. Temperature affects the speed of the reaction of the resin with the curing agent. Therefore, it is important to design the polymer resin according to downhole conditions. As curing temperature approach glass transition temperature, the mechanical properties of the cured resin are compromised.
Resin formulation #1 investigated in this study was used in the field for different applications. However, all the application were performed in tempratures lower than 225 °F due to temperature limitation.
The objective of this paper is to investigate new resin formulation and its suitability to be applied in deeper section where temperature is way above 225 °F reaching in some application to more than 290 °F. The resin formulation was cured through polymerization process using an amine curing agent to improve properties even further. The final cured polymer was then analyzed through DSC, TGA, and SEM experiments.
Lithofacies Controls on Mechanical Properties and Brittleness in Qusaiba Shale, Rub’ Al-Khali Basin, Saudi Arabia
Authors: Mustafa Ayyaz , Abdulraheem Abdulazeez , Abouelresh Mohamed Ibrahim , Sahin Ali 
Published: April 2019

The lower Silurian Qusaiba Shale is one of the major source rocks for Paleozoic petroleum reservoirs in Saudi Arabia and is considered a potential shale gas resource. The study aims to evaluate the prospectivity and improve the production potential of Qusaiba shale by defining the lithofacies and mineralogy as controlling factors for brittleness and other mechanical parameters.
The continuous 30 feet subsurface cores and log data of Qusaiba Shale from Rub’ Al-Khali Basin were utilized for the study. Geological characteristics on the core were fully demonstrated in terms of size, mineralogy, color, primary structures and diagenetic features to identify lithofacies. In addition, 30 thin sections were used to study micro scale geological characteristics. The powder X-ray diffraction (XRD) was used to determined the mineralogical compositions. Surface morphology visualization and elemental analysis were performed using the scanning electron microscope supplemented with energy dispersive spectroscopy (SEM-EDS). Acoustic velocity measurements and compressive strength tests were performed on 15 core plugs (5 from each lithofacies).
Based on the above-mentioned analyses, three lithofacies were identified: (1) Micaceous laminated organic-rich mudstone facies (Lithofacies-I), (2) Laminated clay-rich mudstone facies (Lithofacies-II), and (3) Massive siliceous mudstone facies (Lithofacies-III). Mineralogical composition resulted in variable amounts of quartz ranging from 39 to 40, 45-55 and 60 to 78% for Lithofacies-I, II and III, respectively. Lithofacies-I having relatively lower quartz and higher clay percentage and total organic content (12% by volume) exhibited low stiffness. Mineralogy- and elastic parameters-based brittleness indices exhibited ductile behavior of this lithofacies. Lithofacies-II with relatively higher quartz (45 to 55%) and lower clay contents and TOC (3-5%) than Lithofacies-I resulted in relatively higher stiffness and brittleness. The brittleness index exhibited brittle behavior for silica rich Lithofacies-III (low TOC&lt; 3%) as reflected by Young's modulus (average 32 GPa) and low Poisson's ratio (average 0.25). Hence, it is concluded that mineralogy and geological characteristics are the main controlling factors on mechanical properties and brittleness. The integration of three essential disciplines i.e. geology, mineralogy and geomechanics, plays the key role to better evaluate the production potential by highlighting the sweet spots within the heterogeneous shale gas reservoirs.
Consistent Evaluation of the Organic Content of the Qusaiba Shale Using Digital-Rock Methodology
Authors: Abouelresh Mohamed , Khodja Mohamed , Husseini Rizwanullah , Al-Mukainah Hani , Ali Abdelwahab 
Published: April 2019

AbstractUnconventional hydrocarbon resources continue to engender increasing attention as potential energy sources. This is reflected in the ongoing research aiming at gaining a better understanding of potential unconventional reservoirs. In this note, we describe a study focused on an organic-rich, potential gas-producer shale from Saudi Arabia, namely the Qusaiba Shale. The study aims, in particular, to quantify organic matter content, mineral content, and porosity using digital-rock methodology validated by laboratory measurements.Rock plugs are selected from whole cores representative of the organic-rich, Qusaiba Shale. The core plugs are first digitized using high-resolution μ CT scan and the obtained 3D models are segmented to separate the total organic content (TOC) volume, rock matrix, and pore network. X-ray diffraction (XRD), X-ray fluorescence (XRF), and quantitative scanning electron microscopy (SEM) analyses are undertaken to determine elemental and mineralogical composition. To characterize porosity at a level adequate for shale, the samples also undergo SEM imaging, as well as nuclear magnetic resonance (NMR) analysis. Subsequently, numerical upscaling is applied and comparison of numerical and experimental results is performed.Petrography and mineralogy analyses show that the major mineral components of the Qusaiba Shale samples are silica, feldspars, mica, clay, and pyrite. SEM imaging reveals that, at the nanoscale, the samples are characterized by a variety of pore types, sizes, and morphologies. Porosity comes in two types: intergranular and organic, with intergranular porosity being the dominant type. Compaction and horizontal alignment of the detrital mineral grains control the development of intergranular porosity while the distribution of organic particles, as well as their maturity, are the key factors controlling the formation of organic porosity. Integrating SEM images, high-resolution X-ray scans, and NMR measurements provides the information utilized to quantitatively determine the mineral and organic contents of the samples. Preliminary results exhibit a consistent agreement between the upscaled digital-rock-based estimates and the experimental measurements.The main contribution of this study is an affordable, Digital Rock Physics (DRP)-based characterization of the organic content, mineral content, and pore-network structure of samples representative of Saudi Arabia's potential shale gas reservoirs that is consistent with laboratory measurements.
Application of the Broadband Seismic Acquisition in Huizhou Sag, Pearl River Mouth Basin, China
Authors: Chen Zhaoming , Yang Dengfeng , Luo Wei , Xu Yingjing 
Published: April 2019

Abstract
The Huizhou sag of the Pearl River Mouth Basin is one of the first areas to try to operate the broadband seismic acquisition with variable-depth streamer in the offshore seismic exploration of China. Different from the conventional acquisition, the streamer of the broadband seismic acquisition is depth variable. Through broadband seismic acquisition and processing, the ghost waves can be effectively identified and removed to broaden the seismic frequency band. In order to make good use of the broadband seismic data, we firstly test the reliability of broadband seismic data through a forward model and post-stack seismic inversion. Then the targets in Huizhou sag is taken as an example to do the inversion experiments. The results show: the broadband seismic acquisition can effectively suppress the interference of the wavelet side-lobe and the multiples and can obviously improve the signal-to-noise ratio; meanwhile, it can enhance the accuracy to identify the thickness of the reservoir and can improve the fidelity of seismic data.
Use of N115 Carbon Nano-Fluid for Solar Powered Steam Assisted Gravity Drainage for Extracting Bitumen
Authors: Lalu Lijo P. , Lal Ravinav 
Published: April 2019

AbstractShowing concern for the high emission of green house gases, the governments all over the world are coming up with more stringent rules to check the emission level. Steam Assisted Gravity Drainage is a highly energy intensive process where huge amount of steam is generated by heating natural gas or coal thereby generating a very large share of green house gases. Therefore, solar energy seems to be lucrative in the following ways: world areas with abundant solar irradiation level can be tapped to reduce the fossil fuel consumption, minimizing the cost spent on fossil fuel and the emissions level at the same time. Concentrated Solar Power (CSP) looks a very promising technique but it comes with its own limitations mainly due to the requirement for huge area for setting up the solar collectors. Water Soluble Carbon-N115 is a sub-micrometer particle that has size less than the wavelength of light. Due to this reason, instead of scattering light, it absorbs light. The nano-particle gets enveloped in a thin layer of steam when put in a water bath. The vapour is released after reaching liquid-air interface and the nano-particles revert back to the solution to repeat the vaporization process and they exchange heat with the fluid, slightly raising the fluid temperature resulting in boiling of the fluid volume as a parallel effect. The paper discusses a model incorporating this nano-particle for the reduction of solar field footprint by more than a quarter and thereby reducing the cost and operational area. The paper also suggests the places across the globe where the proposed method can be deployed for generating steam and ultimately injecting it for producing oil above the surface from a tar-sand reservoir.
Application of Full Wavefield Migration in Obtaining True Amplitude Below Gas Cloud
Authors: Mad Zahir Mohamad Hafizal , Md Sahad Salbiah , Ishak M Anwar , Ghazali Ahmad Riza 
Published: April 2019

Abstract
This paper presents an alternative solution for gas cloud imaging using full wavefield migration (FWM). The application of FWM method have been applied on both synthetic dataset with gas cloud event and existing field with gas cloud issue. The full wavefield migration is an inversion-based imaging algorithm that utilizes the complete reflection measurements: primaries as well as all multiples, both surface and internal to obtain the total reflections measurement. It combines the primary and higher order scattering reflection from the gas cloud to estimate the true amplitude response below the gas cloud. Successful applications to both synthetic and field data examples demonstrate that FWM improves the imaging illumination and resolution below gas cloud as compared to conventional migration.
Seismic Acquisition of Walkaway VSP and Walk Around VSP in the Xihu Sag of East China Sea Basin
Authors: Xiong Zhong , Jiang Zhiqiang , Jiang Yu 
Published: April 2019

Abstract
A pre-exploration well was drilled in the Xihu Sag of East China Sea basin, and commercial oil and gas flow had been achieved. But the oil and gas bearing trap had a big depth with low closure height and small area. The resolution of seismic data acquired by towed streamer is low, so it's difficult to obtain seismic velocity precisely. There were great risk and uncertainty in description of the trap and distribution of gas-bearing sandstone, reservoir prediction of sweet spot, direct hydrocarbon indication, and reserves assessment.
In consideration of the drilling platform on the trap, seismic acquisition technique of walkaway VSP and walk around VSP were introduced, meanwhile some innovative methods in source, receivers and geometry were applied. Twenty three-component hydrophones were composed as signal receivers which had a sample interval of ten meters in the well, two straight shot lines and two loop shot lines were designed around the drilling platform. Besides, volume and depth of air gun array were optimized, and the sailing route of seismic source vessel was planned properly in order to improve the efficiency of collecting work.
The collecting work of walkaway VSP and walk around VSP was accomplished efficiently, and more than seventy kilometers VSP seismic data was achieved. Afterwards, the new data was processed finely in company with zero offset VSP data, so high resolution VSP profiles and accurate seismic velocity were obtained. Reprocess to original seismic data acquired by towed streamer was implemented on the basis of walkaway VSP and walk around VSP data. The quality of normal seismic data was improved through reprocess constrained by walkaway VSP data, and S/N and resolution were much higher than old data. So it would be credible to research the distribution of gas-bearing sandstone and direct hydrocarbon indication using the reprocessed seismic data.
It was the first time to use joint acquisition technique of walkaway VSP and walk around VSP in offshore China which was an important breakthrough. High resolution VSP seismic profiles and precise seismic velocity could be acquired, and the data was important basis for refined evaluation of pre-exploration targets. It's very necessary to popularize and utilize these new techniques further.
Allied In-Situ Injection and Production for Fractured Horizontal Wells to Increase Hydrocarbon Recovery in Tight Oil Reservoirs: A Case Study in Changqing Oilfield
Authors: Yu Haiyang , Chen Zhewei , Yang Zhonglin , Cheng Shiqing , He Youan , Xian Bo 
Published: April 2019

Abstract
Poor energy supplement and low hydrocarbon recovery are the two main shortcomings for water or gas injection in tight oil reservoir development. Horizontal well flooding can improve oil recovery and sweep efficiency of water flooding. However, the economic benefits need to be considered for long horizonal well injection. Based on a case of Changqing Oil filed, this paper presents a novel development approach, Allied In-Situ Injection and Production (AIIP), for fractured horizontal wells to increase hydrocarbon recovery, and explores its feasibility with simulation work, compared with traditional water flooding method. The impact for the existence of natural fractures in tight oil reservoir is also studied in this work. Although requiring costly special equipment, a series of simulations prove that AIIP is a more reliable and efficient approach to increase the performance of fractured horizontal wells compared to conventional methods, oil recovery and oil rate were improved significantly after AIIP was conducted. Water injectivity increased sharply than traditional water flooding with a lower injection pressure. The existence of natural fracture in tight oil formation improved the water flow inside the formation, leading better sweep efficiency and higher oil recovery factor. However, water cut in producers increased faster in natural facture enriched model than that of basic model. Thereforem it is essential to evaluate the performance of AIIP process before application.