bluuebunny/crossref_metadata_2025_split huggingface dataset:
A New Enhanced Oil Recovery Approach for Clayey Sandstone Reservoirs Using Sequential Injection of Chelating Agent Solutions with Different Concentrations
Authors: Mahmoud Ahmed Abdulhamid , Al-Hashim Hasan 
Published: November 2017

Abstract
Enhanced oil recovery (EOR) techniques are very expensive processes especially in harsh reservoir environment such as high temperature, pressure and salinity as the applications of classical EOR techniques have been limited to certain reservoirs. This work is aimed to design a cost effective EOR technique utilizing Ethylenediaminetetraacetic acid (EDTA) chelating agent solutions prepared using undiluted seawater (57k ppm).
Chelating agents have been used in petroleum industry as matrix stimulation fluids because of their ability to dissolve calcite and chelate the interlayer cations of clay minerals especially (Fe+3 and Ca+2) and keep them in solution without any significant precipitation. Recently, coreflood tests of sandstone core samples using EDTA solutions revealed significant increase in oil recovery during the tertiary mode. This paper presents a new approach to optimize oil production and minimize the injection pressure needed to flood sandstone reservoirs by injecting chelating agent solutions prepared in seawater without dilution with moderate to high pH levels and optimized concentrations in a sequential form after conventional waterflooding starting with small concentration followed by higher concentrations. The main objective of this approach is to optimize the concentrations and pH of the EDTA chelating agent solutions prepared in undiluted seawater for better oil recovery and improved injectivity using sandstone core samples. Coreflood tests at 100°C were conducted using Gray Berea sandstone core samples.
Coreflood results showed incremental oil recovery of about 15% of OOIP when the samples were flooded by the 5wt% chelating agent solution. The pressure drop during the flooding sequence confirmed that there was no damage due to clays detachment and migration or calcite dissolution at the experiments conditions of pH higher than 9.75 and EDTA concentration of 5wt% or less in undiluted seawater for Gray Berea sandstone samples.
A cost effective EOR fluid system having optimum chelating agent concentrations and pH have been designed to function as surface chemistry agents for alteration of sandstone rock wettability to a more water-wet conditions, and hence, can be used as EOR fluids.
Organic Matter Variability in the Early Silurian Qusaiba Source Rocks, Saudi Arabia
Authors: Hayton Shaun , Jaeger Hartmut 
Published: November 2017

Abstract
Regionally extensive organic-rich shales characterize the lower section of the Early Silurian Qusaiba Member, Qalibah Formation. These shales are believed to have acted as the primary Paleozoic petroleum systems source rock in Saudi Arabia. Based on the interpreted paleoenvironmental/chronostratigraphic variability of these organic-rich hot shales (Hayton et al., 2017), significant variation in the organic matter (OM) composition is expected to be present within these source rocks. With notable exceptions including Cole (1994) and Abu-Ali (2005), most of the OM typing work on the Qusaiba Member source rocks has been largely inferred from bulk geochemical analysis. OM typing inferred from bulk geochemistry (e.g. Rock-Eval) is undoubtedly useful, but as it is a weighted average of the mixture of the individual OM components, organic petrography is required to understand the actual OM composition.
Organic petrography conducted on 47 Qusaiba Member core samples from eight wells across the Kingdom identified 5 major groups of OM: (1) aquatic palynomorphs, like acritarchs (strongly fluorescent), (2) terrestrial palynomorphs, like cryptospores (moderately fluorescent), (3) structureless brownish organic matter (BOM), (4) graptolites and chitinozoa (nonfluorescent), and (5) inertinite and black degraded OM (nonfluorescent). Most samples are dominated by partially intensely degraded, nonfluorescent BOM. In one well much of the BOM shows intense fluorescence, indicating significant quantities of hydrogen-rich OM in this well. In all other wells the abundance of hydrogen-rich OM (group 1 and 2) is usually less than 5% each. As expected, given the observed variation in graptolite occurrence on bedding planes in core, group 4 OM abundance is highly variable.
This is the first study aimed at quantifying the variability in the nature of the OM within the Early Silurian source rocks of Saudi Arabia. The findings show that there is significant variability in the nature of the OM, both laterally and chronostratigraphically. Therefore, great care needs to be taken to ensure that geochemical and especially kinetics work on Qusaiba source rocks takes into account this variability, as this will have significant impact on volumetric resource calculations when integrated with basin modeling.
The identification of BOM as the dominant type of OM in the Qusaiba Member means that this organic matter (of hitherto unknown biological affinity) has played a major role in controlling the hydrocarbon generative potential of these source rocks. This highlights the need for further work to understand its primary composition, biological precursor, and hydrocarbon generative potential. Future work will continue to explore for ways to link the organic matter composition to the chronostratigraphy, so that the organic matter composition and correspondingly the hydrocarbon generative potential of the organic-rich shales of the Qusaiba Member can be determined in a predictive manner to support exploration activities.
Application of Nanoparticle Aided Silicate Reservoir Conformance Control Method at the Algyo Field, Hungary: Fundamentals and Case Histories
Authors: Lakatos I. , Szentes G. , Vago A. , Karaffa Z. 
Published: November 2017

Abstract
Reservoir conformance control (RCC) might be fundamental designing profitable production technology in oilfields. Appropriate application of RCC methods can significantly result in improved IOR/EOR through reduced water production and profile correction. In the past decades, numerous techniques were extensively applied with these goals; however, the operators did not appreciate the silicates until mid-1970s despite the fact that emblematic professionals proposed the silicate gels as efficient alternatives to organic gel technologies. Recently, the attitude towards the extensive use of silicates in oilfields has changed. The silicate-based water shutoff treatments and profile control methods have been already used more than hundred times in Hungary, Serbia, Norway, USA, Oman, and other countries. In the past several years, the fundamental and applied research focused on elimination of inherent negative properties of pure silicate gels, and development of efficient and flexible technologies using polymers and nanosilica in the treating solutions. As a result, the diverse silicate RCC methods arouse high interest in oilfield applications. Today, the environmentally friendly composition of the chemical systems, viz. the green technologies are particularly appreciated by the operators.
The presentation summarizes the results of both the fundamentals and a pilot tests accomplished in the Algyő field, and critically analyzes the lessons to learn. Base on the publications disseminated until now it can be concluded that these field jobs demonstrate outstanding responds both in water cut and increased oil rate. It was also proved that the nanoparticle-induced (nucleated) formation of silicate gels could potentially be used in all types of porous and fractured reservoirs. In addition, the in-situ formed gels have outstanding thermal stability up to 150°C, the chemicals are mass-produced and available at low price, the job needs simple surface facilities, and customary human force to operate the RCC method. Consequently, the green silicate methods being low OPEX and CAPEX expenditure, the technology may open new vistas curing numerous problems arising at both oil and gas fields even in time of volatile oil and gas price.
Inverted ESPs Actuating: Water Cone Control, Oil Production Increase, and Produced Water Subsurface Disposal - North Kuwait Case Study
Authors: Al-Maqsseed N. H. , Anthony E. P. , Elaila S. Z. , Areekat M. , Fox M. 
Published: November 2017

Abstract
Inverted Electrical Submersible Pumps (ESPs) are considered to be a relatively young addition to the Artificial Lift portfolio, and were solely used for unnatural Dumflooding (DF) purposes, where the injection zone is located below the source zone, i.e. requiring the pump discharge to be positioned at the bottom of the assembly and the intake evidently on top. Few inverted-ESP-DF applications have been analyzed or reported. Accordingly, operators and technology providers have yet a lot to venture through and improve; in the aspects of inverted ESP design enhancements and concept utilizations. KOC's – North Fields are the first to actuate Cone Control Completions (CCCs) via inverted ESPs; attaining affectability levels never before achieved using conventional technologies. The concept of Cone Control technology is to create a pressure drawdown (ΔP), just below the Oil Water Contact (OWC), marginally higher than the ΔP across the perforated interval within the Oil leg. This drawdown retards the progression of the water cone, and can best be achieved using an inverted, bottom-discharge high-volume ESP. Inverted ESPs were selected after the limited success achieved from utilizing a shrouded conventional ESP with Y-tool in the original CCC implementation at KOC's - North Fields. The major limitations with this ESP configuration were casing size (can only be used in 9⅝" casings and larger; smaller casing sizes implied smaller ESP series of lower rate attainments), and injection rate restrictions (limited to 4,500 BPD, beyond which shroud erosion is expected). Inverted ESP's eliminated both constraints, and added the advantage of being shorter and more compact (as they are operating with gravitational forces), suitable for wells with higher dogleg severities. CCC can, here-by, be considered an emerging technology for improved oil recovery from water drive reservoir; as an effective tool for the retardation or above-OWC-reverse of vicious water cones.
“VelaMente?!” - Sailin in a Crew to Improve Self-Efficacy in People with Psychosocial Disabilities: A Randomized Controlled Trial
Authors: Sancassiani Federica , Cocco Alessio , Cossu Giulia , Lorrai Stefano , Trincas Giuseppina , Floris Francesca , Mellino Gisa , Machado Sergio , Nardi Antonio Egidio , Fabrici Elisabetta Pascolo , Preti Antonello , Carta Mauro Giovanni 
Published: November 2017

Introduction:It has been proposed that sailing can improve quality of life, personal and social skills of people with severe psychosocial disabilities. This study aimed to assess the efficacy of a psychosocial rehabilitative intervention focused on sailing on quality of life, self-efficacy and sense of coherence in people with severe psychosocial disabilities.Methods:The study was a randomized, with parallel groups, waiting-list controlled trial. Participants were 51 people with severe psychosocial disabilities. The intervention was a structured course to learn sailing in a crew lasting three months. A randomized group began the sailing course immediately after a pre-treatment assessment; the waitlist group began the sailing course after a three months period of treatments as usual. Participants were assessed before and after the sailing course, or the waiting list period, on the General Self-Efficacy scale (GSES), Sense Of Coherence scale (SOC) and Health Survey-short form (SF-12).Results:Self-efficacy significantly increased after the sailing course and decreased after treatment as usual (p=0.015). Sense of coherence and the levels of quality of life tended to improve after the sailing course, albeit below levels of statistical significance.Conclusion:When compared to more traditional psychosocial rehabilitative activities, an intervention focused on sailing in a crew positively impacts the sense of coherence and the levels of quality of life and significantly improves self-efficacy of people with severe psychosocial disabilities. Further longitudinal research is required.
Clinical Outcome of Arthroscopic Remplissage as Augmentation During Arthroscopic Bankart Repair for Recurrent Anterior Shoulder Instability
Authors: Miyamoto Ryosuke , Yamamoto Atsushi , Shitara Hitoshi , Ichinose Tsuyoshi , Shimoyama Daisuke , Sasaki Tsuyoshi , Hamano Noritaka , Kobayashi Tsutomu , Osawa Toshihisa , Takagishi Kenji 
Published: November 2017

Purpose:We aimed to assess functional outcomes and postoperative recurrence rate associated with the remplissage procedure used for bone augmentation with Bankart repair in patients with Hill-Sachs lesions after shoulder dislocation.Methods:Preoperative computed tomography was performed to check for bony Bankart lesions,calculate the bone defect rate, and estimate the risk for re-dislocation. Functional and clinical scores were assessed preoperatively and at three months, six months, and one year postoperatively.Results:Between 2011 and 2014, 18 patients (17 male; age at surgery, 29.0±10.4 years; 18 affected shoulders) underwent arthroscopic Bankart repair with arthroscopic remplissage (remplissage group), and 18 sex- and age-matched controls underwent arthroscopic Bankart repair alone (control group). The incidence of bony Bankart lesion and glenoid bone defect was significantly higher in the remplissage group. No complications, re-dislocation, or re-subluxation was noted during or after the operation. Postoperatively, the range of motion and muscular weakness alleviated with time, and the clinical scores improved significantly from the preoperative values. However, the remplissage group showed significantly restricted shoulder flexion, abduction, internal rotation and external rotation even at one year postoperatively. Compared to the control group, the remplissage group showed significantly lower Rowe scores preoperatively, and both Rowe scores and University of California-Los Angeles scale scores remained significantly lower throughout the one-year follow-up.Conclusion:Despite some restriction of external rotation, remplissage leads to better clinical scores and no recurrence, providing a valid means of augmentation for Bankart repair in high-risk patients with engaged Hill-Sachs lesion.
INFLUENCE OF LUBRICANT QUALITY IMPROVEMENT ON THE CHARACTERISTICS OF TRIBOLOGICAL SYSTEMS
Authors: Assenova Emilia , Kandeva M , Majstorović Vidosav 
Published: November 2017

Equipment quality and reliability improvement, and reducing environmental pollution trough tribological understanding are of the key challenges facing tribology and especially green tribology today. The paper deals with a question of huge importance in the application of tribology, namely the impact of lubricants and additives on tribological systems characteristics. Consideration is giv en to the influence of quality improvement of lubricants on the equipment reliability and life extending, as well as on the search for safety solutions to ecological tasks. An illustration of the current development of lubricants and additives is done by t he study of the oil-soluble metal-plating composite additive Valena studied in the Tribology Laboratories of the Faculty of Industrial Engineering at the Technical University Sofia and the Faculty of Mechanical Engineering of Belgrade University.
Rapidly Rising Optical Transients from the Birth of Binary Neutron Stars
Authors: Hotokezaka Kenta , Kashiyama Kazumi , Murase Kohta 
Published: November 2017

Abstract
We study optical counterparts of a new-born pulsar in a double neutron star system like PSR J0737-3039A/B. This system is believed to have ejected a small amount of mass of


(
0.1

M

⊙

)

at the second core-collapse supernova. We argue that the initial spin of the new-born pulsar can be determined by the orbital period at the time when the second supernova occurs. The spin angular momentum of the progenitor is expected to be similar to that of the He-burning core, which is tidally synchronized with the orbital motion, and then the second remnant may be born as a millisecond pulsar. If the dipole magnetic field strength of the nascent pulsar is comparable with that inferred from the current spin-down rate of PSR J0737-3039B, the initial spin-down luminosity is comparable to the luminosity of super-luminous supernovae. We consider thermal emission arising from the supernova ejecta driven by the relativistic wind from such a new-born pulsar. The resulting optical light curves have a rise time of ∼10 days and a peak luminosity of ∼1044 erg s−1. The optical emission may last for a month to several months, due to the reprocessing of X-rays and UV photons via photoelectric absorption. These features are broadly consistent with those of the rapidly rising optical transients. The high spin-down luminosity and small ejecta mass are favorable for the progenitor of the repeating fast radio burst, FRB 121102. We discuss a possible connection between new-born double pulsars and fast radio bursts.
Rise of the Titans: A Dusty, Hyper-luminous “870 μm Riser” Galaxy at z ∼ 6
Authors: Riechers Dominik A. , Leung T. K. Daisy , Ivison Rob J. , Pérez-Fournon Ismael , Lewis Alexander J. R. , Marques-Chaves Rui , Oteo Iván , Clements Dave L. , Cooray Asantha , Greenslade Josh , Martínez-Navajas Paloma , Oliver Seb , Rigopoulou Dimitra , Scott Douglas , Weiss Axel 
Published: November 2017

Abstract
We report the detection of ADFS-27, a dusty, starbursting major merger at a redshift of z = 5.655, using the Atacama Large Millimeter/submillimeter Array (ALMA). ADFS-27 was selected from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) and APEX/LABOCA data as an extremely red “870 μm riser” (i.e.,

), demonstrating the utility of this technique to identify some of the highest-redshift dusty galaxies. A scan of the 3 mm atmospheric window with ALMA yields detections of CO(J = 5 → 4) and CO(J = 6 → 5) emission, and a tentative detection of H2O(211 → 202) emission, which provides an unambiguous redshift measurement. The strength of the CO lines implies a large molecular gas reservoir with a mass of M
gas = 2.5 × 1011

M
⊙, sufficient to maintain its ∼2400 M
⊙ yr−1 starburst for at least ∼100 Myr. The 870 μm dust continuum emission is resolved into two components, 1.8 and 2.1 kpc in diameter, separated by 9.0 kpc, with comparable dust luminosities, suggesting an ongoing major merger. The infrared luminosity of L
IR ≃ 2.4 × 1013
L
⊙ implies that this system represents a binary hyper-luminous infrared galaxy, the most distant of its kind presently known. This also implies star formation rate surface densities of

and 750 M
⊙ yr−1 kpc2, consistent with a binary “maximum starburst.” The discovery of this rare system is consistent with a significantly higher space density than previously thought for the most luminous dusty starbursts within the first billion years of cosmic time, easing tensions regarding the space densities of z ∼ 6 quasars and massive quiescent galaxies at z ≳ 3.
Modeling the Effects of Inhomogeneous Aerosols on the Hot Jupiter Kepler-7b’s Atmospheric Circulation
Authors: Roman Michael , Rauscher Emily 
Published: November 2017

Abstract
Motivated by observational evidence of inhomogeneous clouds in exoplanetary atmospheres, we investigate how proposed simple cloud distributions can affect atmospheric circulations and infrared emission. We simulated temperatures and winds for the hot Jupiter Kepler-7b using a three-dimensional atmospheric circulation model that included a simplified aerosol radiative transfer model. We prescribed fixed cloud distributions and scattering properties based on results previously inferred from Kepler-7b optical phase curves, including inhomogeneous aerosols centered along the western terminator and hypothetical cases in which aerosols additionally extended across much of the planet’s nightside. In all cases, a strong jet capable of advecting aerosols from a cooler nightside to dayside was found to persist, but only at the equator. Colder temperatures at mid and polar latitudes might permit aerosol to form on the dayside without the need for advection. By altering the deposition and redistribution of heat, aerosols along the western terminator produced an asymmetric heating that effectively shifts the hottest spot further east of the substellar point than expected for a uniform distribution. The addition of opaque high clouds on the nightside can partly mitigate this enhanced shift by retaining heat that contributes to warming west of the hotspot. These expected differences in infrared phase curves could place constraints on proposed cloud distributions and their infrared opacities for brighter hot Jupiters.
New Parallaxes for the Upper Scorpius OB Association
Authors: Donaldson J. K. , Weinberger A. J. , Gagné J. , Boss A. P. , Keiser S. A. 
Published: November 2017

Abstract
Upper Scorpius is a subgroup of the nearest OB association, Scorpius–Centaurus. Its young age makes it an important association to study star and planet formation. We present parallaxes to 52 low-mass stars in Upper Scorpius, 28 of which have full kinematics. We measure ages of the individual stars by combining our measured parallaxes with pre-main-sequence evolutionary tracks. We find a significant difference in the ages of stars with and without circumstellar disks. The stars without disks have a mean age of 4.9 ± 0.8 Myr and those with disks have an older mean age of 8.2 ± 0.9 Myr. This somewhat counterintuitive result suggests that evolutionary effects in young stars can dominate their apparent ages. We also attempt to use the 28 stars with full kinematics (i.e., proper motion, radial velocity (RV), and parallax) to trace the stars back in time to their original birthplace to obtain a trackback age. As expected, given the large measurement uncertainties on available RV measurements, we find that measurement uncertainties alone cause the group to diverge after a few Myr.
Absolute Dimensions of the F-type Eclipsing Binary V2154 Cygni
Authors: Bright Jane C. , Torres Guillermo 
Published: November 2017

Abstract
We report spectroscopic observations of the 2.63 day, detached, F-type main-sequence eclipsing binary V2154 Cyg. We use our observations together with existing uvby photometric measurements to derive accurate absolute masses and radii for the stars that are good to better than 1.5%. We obtain masses of

and

, radii of

and

, and effective temperatures of 6770 ± 150 K and 5020 ± 150 K for the primary and secondary stars, respectively. Both components appear to have their rotations synchronized with the motion in the circular orbit. A comparison of the properties of the primary with current stellar evolution models gives good agreement for a metallicity of

, which is consistent with photometric estimates, and an age of about 2.2 Gyr. On the other hand, the K2 secondary is larger than predicted for its mass by about 4%. Similar discrepancies are known to exist for other cool stars, and are generally ascribed to stellar activity. The system is in fact an X-ray source, and we argue that the main site of the activity is the secondary star. Indirect estimates give a strength of about 1 kG for the average surface magnetic field on that star. A previously known close visual companion to V2154 Cyg is shown to be physically bound, making the system a hierarchical triple.