bluuebunny/crossref_metadata_2025_split huggingface dataset:
Innovative Approaches for Full Subsea P&A Create New Opportunities and Cost Benefits
Authors: Øia Thomas Monge , Aarlott Mats M. , Vrålstad Torbjørn 
Published: April 2018

Abstract
Plug and abandonment (P&A) of subsea wells is very costly and usually requires semi-submersible drilling rigs (SSR). To reduce total costs of the subsea P&A campaigns, it is beneficial to perform P&A operations with riserless light well intervention (RLWI) vessels instead of rigs. Currently, a drilling rig is required for performing P&A operations in the reservoir section and overburden, whereas intervention vessels can be used for preparatory work and wellhead removal.
This paper discusses how it can be technologically feasible to perform full P&A of subsea wells with RLWI vessels. It is shown that, for wells of simple and medium complexity, innovate approaches with use of existing technologies can enable full P&A of the entire well with RLWI vessels. This is demonstrated by thorough analyses of operational procedures using available technologies, where RLWI operations are compared to rig operations for different well scenarios. Furthermore, to quantify the cost benefits of the innovative approaches, a cost-optimization tool has been used to estimate the resulting cost and time durations of the different approaches and scenarios.
Performance of Silica Nanoparticles in CO2-Foam for EOR and CCUS at Tough Reservoir Conditions
Authors: Rognmo A. U. , Al-Khayyat N. , Heldal S. , Vikingstad I. , Eide O. , Fredriksen S. B. , Alcorn Z. P. , Graue A. , Bryant S. L. , Kovscek A. R. , Ferno M. A. 
Published: April 2018

Abstract
We show experimentally that surface treated silica nanoparticles greatly enhance the thermodynamic stability of CO2-foam compared to other foam stabilizers at elevated temperatures and salinities in the presence of oil. The aqueous nanofluid mixes with CO2 in the porous media to generate CO2-foam for enhanced oil recovery by improved sweep efficiency, resulting in reduced carbon footprint from oil production. Our results show that surface modified nanoparticles are able to stabilize CO2-foam at elevated temperatures and extreme brine salinities, and demonstrate that nanoparticle injection for improved CO2-foam mobility is an upcoming CCUS technology for mature fields. New experimental results show that 1) nanofluids remain stable at extreme salinities (up to 25 wt% TDS) with the presence of both monovalent and divalent ions; 2) both pressure gradient and incremental oil recovery during tertiary CO2-foam injections were 2 - 4 times higher with nanoparticles compared to no foaming agent; 3) CO2 stored during CCUS with nanoparticle stabilized CO2-foam increased by over 300% compared to co-injections without nanoparticles.
Innovative Test Solutions of Drilling & Completion Fluids to Maximize Well Productivity
Authors: Ibragimova Zalpato , Mathisen Anne Mette , Fleming Niall 
Published: April 2018

Abstract
From a production or injection point of view, the two most important parameters for drilling and completion fluid are effective clean-up upon well start-up and compatibility with the selected lower completion solution to avoid impairment to well productivity or injectivity.
This paper presents results from laboratory tests using Statoil's innovative test methodology for verification of drilling and completion fluids to avoid completion incompatibility and maximize well productivity.
API/ISO standards specify a set of tests for characterization and selection of drilling and completion fluids. However, in spite of fluids showing similar results under such testing considerable disparities can be observed when the same fluids are used in the field.
The aim of the paper is to provide a thorough comparison of different reservoir drill-in and screen running fluids that have been examined using Statoil's internal non-standard methodology. It is demonstrated how fluid design, and chemistry in combination with solids, may be used to interpret results with respect to risk of productivity impairment.
Sleipner B-1 Straddle Operation and Crossflow Project
Authors: Vevatne Jonas Nesland 
Published: April 2018

Abstract
Sleipner Vest is a large gas-condensate field which is produced by pressure depletion. Currently (January 2018) the best production well is B-1. B-1 is placed in a segment with very strong pressure support from aquifer. In summer 2016, it was about to water out. A straddle operation was planned and executed.
The straddle operation was very successful. More than a year later, B-1 still produced more than twice as much as any other Sleipner well. However, the water is eventually expected to come back in the remaining perforations. Concepts for crossflowing the gas and water production from the well into another reservoir has been investigated.
Increased Production with Automatic Well Control at Heidrun Oil Field
Authors: Bergheim Elvira Marie , Kittilsen Pål , Fredriksen Morten , Strupstad André , Dudasova Dorota , Gustavsen Øyvind 
Published: April 2018

Abstract
Production at Heidrun is normally limited by the gas handling capacity. Maximum oil production is achieved by producing wells with the lowest gas/oil ratio (GOR) and at the same time utilize the available gas capacity. GOR may change over time, so to obtain desired production it is vital with a continuous follow-up work of well testing and maintenance of multiphase meters. The Heidrun field also has many wells with challenges like; sand entrainment, drifting draw-down, limited draw-down or bottom hole pressure (BHP) and drifting GOR. These elements are crucial to control to achieve desired production. This time-consuming task is handled through a close cooperation between offshore operations and production engineers onshore. Automatic choke control is installed at Heidrun to ensure operation at the maximum gas capacity and keeping the wells at desired operating point. The automatic controllers lead more precise production from each well with a totalized higher production, reduced emissions, reduced operator loads and is a valuable tool for production optimization.
Out of Zone Injection
Authors: Galiev A. , Mukhliev I. , Volkov M. , Gress R. M. , Zaripova A. , Trusov A. 
Published: April 2018

Abstract
An oil field can be classified as mature when its production rate is significantly declining and/or when it is close to reaching its economic limit. A field might also be considered mature when it is close to attaining a recovery factor considered acceptable for its reservoir mechanisms. Strategies and methodologies to rejuvenate the field, enhancing production and increasing longevity of life will then commence. One of the most common methods of enhancing oil recovery (EOR) is by means of waterflooding, a device whereby injector wells are drilled in an oil field to inject water or gas into the reservoir to increase pressure and stimulate production. This, however, is a complex process posing its own uncertainty in optimally delivering increased production due to the complexity of reservoir type and well design. Having the ability to listen behind casing and deducing flow allocation of injection in which to increase the sweep and improving reservoir production performance becomes vital to enhancing oil recovery.
This paper demonstrates how spectral noise logging has aided in rejuvenating oil fields and enhancing oil recovery. Three different oil field examples are examined and discussed, illustrating the methodology and benefits of better understanding flow allocation behind casing to provide much-needed solutions to aid in field life longevity.
MWD Wellbore Surveying – Sensitivity Analysis of Survey Errors as a Function of Hole Inclination and Compass Direction
Authors: Hassan S. M. , Brechan B. , Sangesland S. , Dale S. I. 
Published: April 2018

Abstract
Measurement While Drilling (MWD) is a common survey tool used in wellbore positioning. The industry often uses the Industry Steering Committee on Wellbore Survey Accuracy (ISCWSA) error models for estimating the Wellbore Position Uncertainty (WPU). However, the model's sensitivity to direction and nature of trajectory has not been discussed in detail. In this paper, a software model has been developed to better understand the influence of the individual error sources on measurement and position uncertainty in various drilling directions and hole sections.
Most operators have classified accurate wellbore positioning and directional design as one of the pillars of safety. It is commonly known that measurement accuracy of frequently used MWD instruments decreases with increasing hole inclination. Survey accuracy is also influenced by North to East direction. This work provides a detailed understanding of the behavior and contribution of each survey error source and screens the error terms contributing most towards WPU. Visualizing the contribution of each error source as a function of well path direction and inclination will support the understanding of position uncertainty of individual wells.
The results in this paper are based on analysis of the ISCWSA Non-mag error model. It has been observed that some errors are most dominant in the North/South drilling direction while others are most dominant in the East/West direction. Similarly, some error sources are most effective in the vertical hole section and least effective in the build-up or horizontal sections. This process continues for all different error sources in various hole sections and drilling directions. Therefore, this paper has summarized the most important error sources for the vertical, build-up and horizontal sections of the three wells, i.e North/South (NS), North/East (NE) & East/West (EW). The visualization of error sources will provide a more focused approach towards ultimately reducing the WPU.
The work in this paper is a part of a new digital well planning and well construction software tool. The working title of this software is Life Cycle Well Integrity Model – LCWIM.
Experience Using Managed Pressure Cementing Techniques with Riserless Mud Recovery and Controlled Mud Level in the Barents Sea
Authors: Claudey E. , Fossli B. , Elahifar B. , Qiang Z. , Olsen M. , Mo J. 
Published: April 2018

Abstract
The Barents Sea offers unique drilling challenges related to issues such as biogenetic gas in shallow formations, thermogenic gas seeps up to the seabed from underlying formations, shallow formations with abnormal pressure, shallow reservoirs, low-fracture-pressure formations in part of the overburden, and naturally fractured/karstified carbonate reservoirs. This paper discusses cementing challenges when drilling wells in the Barents Sea and the experience gained using managed pressure cementing (MPC) practices.
When drilling the surface hole in potentially slightly overpressured formations, the riserless mud recovery (RMR) technique was used. For the first time on the Norwegian Continental Shelf (NCS), MPC was used when cementing the surface casing. RMR compensates for drilling the overpressurized zones without a riser and blowout preventer (BOP), and MPC allows for pressurization and monitoring of the pressure on the subsea wellhead toward the formation during the cement curing stage.
Once the marine riser and BOP were installed, controlled mud level (CML) technology was used during drilling, running casing/liners, cementing operations, and other activities. CML enables manipulation of the fluid level in the riser and therefore helps optimize downhole pressure to avoid losses and maintain an overbalance. CML has proven to be particularly useful during cementing of liners in naturally fractured reservoirs and during setting of balanced cement plugs in an open hole. As a result, high circulation rates can be achieved and conventional high-density cement slurries can be used.
MPC using either RMR or CML was employed for the first time in the Barents Sea. Examples of how cementing operations were planned and executed are described and results are presented.
A LOW-COST RESISTIVIMETER FOR USE IN PRACTICAL LECTURES OF APPLIED GEOPHYSICS
Authors: Folly Walter Sydney Dutra , Senra Aracy Sousa 
Published: April 2018

ABSTRACT. We describe the construction and testing of a simple and efficient low-cost resistivimeter designed for use in practical classes in Applied Geophysics. The equipment was successfully tested in a vertical electrical sounding (VES) performed on sandy terrain within the campus of the Universidade Federal de Sergipe, Brazil. The VES results were in good agreement with the profiles obtained from two boreholes located approximately 500 m from the test area, clearly demonstrating the efficiency of the equipment and the adopted methodology. Keywords: vertical electrical sounding, electrical resistivity, resistivity profile. RESUMO. Neste artigo, descrevemos a construção e o teste de um resistivímetro de baixo custo, simples e eficiente, concebido para ser utilizado em aulas práticas de Geofísica Aplicada. O equipamento foi testado com a realização de uma sondagem elétrica vertical (SEV) em um terreno arenoso localizado no campus da Universidade Federal de Sergipe, Brasil. Os resultados obtidos nesta SEV apresentaram boa concordância com os perfis observados em dois poços de sondagem localizados a 500 m da área de teste, fato que comprovou a eficiência do equipamento e da metodologia adotada. Palavras-chave: sondagem elétrica vertical, resistividade elétrica, perfil de resistividade.
The Relationship between Watching Television and Academic Achievement in 9th Graders Students
Authors: Kakamad Karwan Kakabra , Fatah Abdulfatah Hasan 
Published: April 2018

This study examines the relationship between watching television and academic achievement of school going 9th-grade students in Kurdistan region of Iraq. After a brief review of some related research and programs the ground realities and problems prevails in Kurdistan region of Iraq society regarding students spending time watching television, their life will be shaped by television, and this affects their academic achievements. The researcher used a quantitative Causal-Comparative research methodology, and 240 9th graders students selected in three different schools. Non-random purposive sampling was used to collect the data. in general, this study finds that television viewing has a moderately negative effect on the academic achievement. This means the more students spent time watching Television the less grade they will achieve in their school. Finally, there are some recommendations provided that should be taken by families and educators including, watching certain programs, co-viewing, having only one television at home.
Moderating role of self-congruence: Impact of brand personality on Brand attachment through the Mediating role of Trust
Authors: Amjad Asma , Amjad Fiza , Jamil Khalid , Yousaf Sharjeel 
Published: April 2018

Increasingly companies are focused on searching for ways to create strong brand connections with consumers. It is illustrated that such connections lead to higher levels of consumer loyalty, which increases companiesâ€™ financial performance. The main purpose of this study is to explore the impact of brand personality on brand attachment through the mediating role of trust. Also investigate the moderating role of self-congruence on the relationship between brand personality and brand trust. SPSS 23 is used to analyze the data. Data was collected through survey questionnaire technique and snow-ball sampling technique was used for data collection. Analysis reveal Brand personality have significant and positive relationship with brand trust. On the other side trust significantly enhance the brand attachment. While the results prove that self-congruence have significant moderating effect on the relationship between brand personality and brand trust.
Earnings-Announcement Narrative and Investor Judgment
Authors: Henry Elaine , Peytcheva Marietta 
Published: April 2018

SYNOPSIS
This study examines how emphasis framing in narrative disclosures, and the investor characteristics of numeracy and persuadability, affect investors' ability to discriminate between firms' better and worse financial performance. In an experiment with 264 participants from the general population, we manipulate emphasis framing in earnings announcement narratives as neutral, consistent, or inconsistent with the firm's performance. We find that investors are better able to distinguish between good and poor firm performance when the accompanying disclosure emphasizes information that is consistent with the firm's performance. Further, persuadability reduces, but numeracy increases, investors' ability to distinguish between good and poor performance. However, our results also indicate that the inclusion of biased numerical information in narrative disclosures may have a greater negative effect on higher numerates than on lower numerates, consistent with theory suggesting that more numerate individuals tend to focus on and draw affective meaning from numbers.
JEL Classifications: M41.
Kontribusi kepemimpinan kepala sekolah dan kinerja guru terhadap prestasi siswa MTsN Kuranji Padang. Program Doktor Jurusan administrasi pendidikan Universitas Negeri Padang
Authors: Rahmi Azvi 
Published: April 2018

Based on field observations, it is observed that student achievement in MTsN Kuranji Padang is still low. Researchers suspect that principal leadership and teacher performance affect student achievement in MTsN Kuranji Padang, therefore a research is conducted to test the truth. This study aims to reveal the contribution of principal leadership and teacher performance to student achievement discipline in MTsN Kuranji Padang. The hypothesis proposed in this research are: 1) principal leadership contributes to student achievement; 2) teachers' performance contributes to student preservation; 3) the principal's leadership and teacher performance contribute jointly to student achievement
The population in this research is all students of MTsN Kuranji Padang. Sampling was done using Stratified Proportional Random Sampling technique. Selected samples were 76 people. Data were collected by questionnaire with Likert scale that has been tested for validity and reliability. Data were analyzed by correlation and regression technique.
The results of the data analysis show that: 1) the principal's leadership contributes to student achievement of 14. 4%; 2) teacher performance contributes to student achievement of 14.2% and 3) principal's leadership and teacher performance together contributes to student achievement 19 4%. Based on descriptive analysis revealed that principal leadership, teacher performance and student achievement are both in fairly good category of ideal score
Upaya Peningkatan Mutu Sekolah melalui Satuan Otonomi Pendidikan
Authors: Cahyana Ade 
Published: April 2018

The diversity of school environtment conditions and student needs in learning process alongside with the complexity in Indonesia geographical condition quite often can not be easily concluded completely in one piece by the central bureaucracy in a comprehensive way. It stimulates the deliverance of school based quality management improvement. This type of alternative management empowers independency to school to initiate its self-governing capacity to manage its own activities in the framework of eduactional quality improvement, while consistently aligned to national policies. Some of the strategies applied at schools comprise self-evaluation to scrutinize the schoolâ€™s strengths and weaknessses. On the basis of the evaluation, school alongside with parents and community settleon school vision and mission of education quality improvement or to put together the expected eduaction quality for further developing on the planning of school program which includes school financing by refering to the scale of priorities and national policies in corresponding to the school condition and the capacity of its human resources. The consequences of the program implementation should imply a highly committed engagement among diversified parties, i.e., parents/community, teachers, principals, pupils and other staffs on one hand, and government (MONE) on the other hand, as the equal partner to attain the objective of quality improvement.Â ABSTRAKBeragamnya kondisi lingkungan sekolah dan bervariasinya kebutuhan siswa di dalam proses pembelajaran ditambah lagi dengan kondisi geografi Indonesia yang sangat kompleks, seringkali tidak dapat diapresiasikan secara lengkap oleh birokrasi pusat. Oleh karena itu, dalam proses peningkatan mutu pendidika perlu dicari alternatif pengelolaan sekolah. Hal ini mendorong lahirnya konsep manajemen peningkatan mutu berbasis sekolah. Manajemen alternatif ini memberikan kemandirian pada sekolah untuk mengatur dirinya sendiri dalam rangka peningkatan mutu pendidikan, tetapi masih tetap mengacu pada kebijakan nasional. Konsekwensi dari pelaksanaan program ini antara lain komitmen yang tinggi dari berbagai pihak yaitu: orang tua/masyarakat, guru, kepala sekolah, siswa dan staf lainnya di satu sisi dan pemerintah (Kemendiknas) di sisi lainnya sebagai mitra dalam mencapai tujuan peningkatan mutu.
Impresi Moderasi Jalur Pembelajaran dengan Proses Belajar Kewirausahaan terhadap Persepsi Keberhasilan Usahawan Surakarta
Authors: Rohmat H. 
Published: April 2018

This research aims at reviewing the relations of entrepreneurial learning process aspect to the perception of the success of the small business entrepreneur, material and non material; also impression of moderation laerning line toward those relation. The result shows that the entrepreneurial learning process aspect related to the perception; success, but not with the material succes. The strong relations is the one with the perception of succes not material. Moreover, learning line impressed moderation to the entrepernuerial learning process toward perception; success, material success and non-material success. Among the three lines of learning, the strongest impression of moderation is the relationship of perceptual learning material success small business.Â ABSTRAK:Tujuan penelitian adalah mengkaji hubungan aspek proses pembelajaran kewirausahaan dengan persepsi keberhasilan usahawan kecil, material dan bukan material; serta impresi moderasi jalur pembelajaran terhadap hubungan tersebut. Hasil penelitian menunjukkan bahwa aspek proses pembelajaran kewirausahaan berhubungan dengan persepsi; keberhasilan, tetapi tidak dengan keberhasilan material, namun berhubungan dengan persepsi keberhasilan bukan material. Hubungan terkuat adalah dengan persepsi keberhasilan bukan material. Selain itu, jalur pembelajaran berimpresi moderasi dengan proses pembelajaran kewirausahaan terhadap persepsi; keberhasilan, keberhasilan material, dan keberhasilan bukan material. Diantara ketiga jalur pembelajaran, impresi moderasi yang terkuat ialah hubungan proses pembelajaran terhadap persepsi keberhasilan material usahawan kecil .