bluuebunny/crossref_metadata_2025_split huggingface dataset:
Large Tricuspid Valve Myxoma in an Asymptomatic Patient with Uterine Myoma: An Uncommon Case
Authors: Khani Mohammad , Esfahani Morteza Abdar , Bayat Fariba , Khalaj Alireza , Bagheri Abdolhamid 
Published: October 2021

Tricuspid valve myxomas are very uncommon tumors that could be found after the occurrence of pulmonary thromboembolism, symptomatic tricuspid obstruction, and right-sided heart failure. Herein, we describe a 42-year-old woman evaluated for an abdominal mass. In preoperative consultation, a tricuspid valve mass was detected in echocardiography. She underwent the removal of a benign uterine myoma and a myxoma of the tricuspid valve. Tricuspid valve myxomas constitute a scarce diagnosis. They could be asymptomatic, occurring in unusual locations and in association with benign tumors in other organs. Our patient was asymptomatic, underscoring the significance of the early diagnosis of this type of tumor to prevent further catastrophic events.
Rare Complications of COVID-19 Pneumonia: Pneumomediastinum and Atrial Fibrillation
Authors: TUNÇ Şeyma , YILDIZ GÜLHAN Pınar , BORAN Mertay 
Published: October 2021

Objective: Coronavirus disease 2019(COVID-19) is considered as systemic disease involving many vital organs in addition to the lungs, including the heart, liver, and kidneys. Pneumomediastinum associated with COVID-19 pneumonia is a rare condition usually seen in patients with underlying lung pathology, infections, or mechanical intubation. We presented a case of late diagnosis of pneumomediastinum and atrial fibrillation in COVID-19 patient undergoing Noninvasive mechanical ventilation (NIMV).
Case: A 66-year-old male patient with a history of COVID-19 pneumonia and 19 days hospital follow up and a NIMV treatment was admitted to our emergency department with palpitations and dyspnea. Thoracic CT and electrocardiography revealed, scattered ground glass areas, pneumomediastinum and high-velocity atrial fibrillation, respectively.
Conclusion: We recommend regular checks with imaging methods and ECG during follow-up in patients with COVID-19. Clinicians should remember that ventilator-related lung damage may be seen in COVID-19 patients undergoing NIMV.
The Effect of Teamwork, Internal Work Environment and Financial Compensation on Employee Performance at Sold Out Distro
Authors: Wijayanti Nadia Rahma Ayu , Andriani Dewi 
Published: October 2021

This study aims to determine the effect of Teamwork, Internal Work Environment and Financial Compensation on Employee Performance at Sold Out Distro in Tulangan Sidoarjo. The method used in this research is a quantitative approach method. Sampling in this study was carried out by non probability sampling method with saturated sample technique with the number of respondents as many as 95 respondents who become employees at Sold Out Distro in Tulangan Sidoarjo. Data collection techniques using a questionnaire. The data analysis technique used in this study uses multiple linear regression using the SPSS statistics version 25 program. The results of this study prove that Teamwork partially affect Employee Performance, Internal Work Environment partially affect Employee Performance and Financial Compensation partially affect Employee Performance.
Selection of EOR Technology in Ultra-Low-Permeability Reservoirs of the Achimov Deposits of the Priobsky Field
Authors: Gimazov Azat Albertovich , Balionis Anzhelika Igorevna , Sergeev Evgeniy Ivanovich , Khudiev Elmir Rovshanovich , Uchuev Ruslan Pavlovich 
Published: October 2021

Abstract
To create a technology for selection the optimal RPM method the simulation on a sector hydrodynamic model of the field has performed. Different injection modes (continuous injection, alternating, cyclic), injection agents and completions of injection wells were tried during the modeling. The key factors, which influence the choice of the RPM method, were determined. Pilot industrial works include short-term nitrogen injection, long-term APG injection, and production from pilot wells in various modes. Well research include pressure testing, well testing after gas injection, recording of inflow profiles, laboratory studies of the Priobskoye field's own core. Evaluation of the potential of gas enhanced oil recovery methods shows their significantly higher efficiency compared to stationary waterflooding. The suggested approach can minimize the risks in the transition to previously untested development methods and methods of enhanced oil recovery in ultra-low-permeability reservoirs of the Achimov deposits. The analysis and the results of partially conducted pilot projects (at the moment) have showed a high potential for gas injection in certain areas of the field.
Flood Control Method in Fields with Hard-To-Recover Reserves
Authors: Syundyukov Alexander Viktorovich , Khabibullin Galiaskar Ismagilovich , Trofimchuk Alexander Stanislavovich , Shaikhatdarov Denis Radikovich , Sagitov Damir Kambirovich 
Published: October 2021

Abstract
This paper presents a method for predicting the development of Auto-HF (crack) in injection wells of the reservoir pressure maintenance system during the development of low-permeable reservoirs, in order to ensure the optimal front of oil displacement by water by regulating the bottom-hole pressure of injection wells based on the derived dependence of the half-length of the Auto-HF (crack).
Induced Thermal Shocking by BiMTheCh Technology as a New Approach for Enhanced Oil Recovery from Tight Reservoirs with Heavy Oil
Authors: Rezaei Koochi Mojtaba , Mehrabi-Kalajahi Seyedsaeed , Varfolomeev Mikhail Alekseevich , Savelev Vladislav Vladimirovich , Ziganshin Eduard Rishadovich , Kadyrov Rail Ilgizarovich , Shamanov Insaf Nakipovich , Galeev Ranel Ilnurovich 
Published: October 2021

Abstract
This work is devoted to investigate the ability of thermal shocking to create fractures in rock samples and thermal cracking of heavy crude oil structure. In order to study the thermobaric characterizations of catalytic and thermal decomposition reaction of binary mixture (BM), a series of experiments was designed in high-temperature and high-pressure reactor (HTHP) and the time to reach the maximum temperature and pressure were monitored. Before and after the experiments, core samples were scanned by 4D tomography. In addition, SARA analysis was done to study the effect of thermal shocking on heavy oil composition. The results showed that using BiMTheCh, the temperature in the reaction zone was increased up to 273 °C during very short time (2 seconds) after activation of the reaction. Either, the pressure was increased up to 129 atm. As results showed, the simultaneous sudden increase in temperature and pressure creates a thermal shock which reduces breakdown pressure from 235 to 12 atm. Computed scanning tomography results confirmed formation of new fractures on the surface of core samples. Results of the SARA analysis also confirmed that the molecular structure of heavy oil due to the binary mixture's reaction was changed. Sharp increase in pressure and temperature induced transformation of heavy components of crude oil such as asphaltenes into lighter components such as saturates. Generally, the binary mixture technology can be used as a new high-efficient and eco-friendly technology for enhanced heavy oil recovery from tight heavy oil reservoirs.
The Development Method of Low-Permeability and Ultra-Low-Permeability Reservoirs by Waterflooding
Authors: Gimazov Azat Albertovich , Bazyrov Ildar Shamilevich 
Published: October 2021

Abstract
The article describes a method for developing low-permeability reservoirs using horizontal wells with multi-stage hydraulic fracturing. The effectiveness of the new method lies in protecting the horizontal part of the production well by drilling it through a non-reservoir plastic reservoir adjacent directly to the target reservoir. The paper considers various implementations of the technology and estimates the increase in oil recovery factor for each of them based on the results of hydrodynamic modeling. The risks associated with the implementation of the technology are considered. Methods for their reduction are proposed.
Industrial Application of Nickel Tallate Catalyst During Cyclic Steam Stimulation in Boca De Jaruco Reservoir
Authors: Vakhin Alexey V. , Mukhamatdinov Irek I. , Aliev Firdavs A. , Feoktistov Dmitriy F. , Sitnov Sergey A. , Gafurov Marat R. , Minkhanov Ilgiz F. , Varfolomeev Mikhail A. , Nurgaliev Danis K. , Simakov Iaroslav O. , Latypov Azat A. , Petrashov Oleg V. , Solovev Aleksey V. , Sansiev Georgi V. 
Published: October 2021

Abstract
A nickel-based catalyst precursor has been synthesized for in-situ upgrading of heavy crude oil that is capable of increasing the efficiency of steam stimulation techniques. The precursor activation occurs due to the decomposition of nickel tallate under hydrothermal conditions. The aim of this study is to analyze the efficiency of in-situ catalytic upgrading of heavy oil from laboratory scale experiments to the field-scale implementation in Boca de Jaruco reservoir. The proposed catalytic composition for in-reservoir chemical transformation of heavy oil and natural bitumen is composed of oil-soluble nickel compound and organic hydrogen donor solvent. The nickel-based catalytic composition in laboratory-scale hydrothermal conditions at 300°С and 90 bars demonstrated a high performance; the content of asphaltenes was reduced from 22% to 7 wt.%. The viscosity of crude oil was also reduced by three times.
The technology for industrial-scale production of catalyst precursor was designed and the first pilot batch with a mass of 12 ton was achieved. A «Cyclic steam stimulation» technology was modified in order to deliver the catalytic composition to the pay zones of Boca de Jaruco reservoir (Cuba). The active forms of catalyst precursors are nanodispersed mixed oxides and sulfides of nickel.
The pilot test of catalyst injection was carried out in bituminous carbonate formation M, in Boca de Jaruco reservoir (Cuba). The application of catalytic composition provided increase in cumulative oil production and incremental oil recovery in contrast to the previous cycle (without catalyst) is 170% up to date (the effect is in progress). After injection of catalysts, more than 200 samples from production well were analyzed in laboratory. Based on the physical and chemical properties of investigated samples and considering the excellent oil recovery coefficient it is decided to expand the industrial application of catalysts in the given reservoir. The project is scheduled on the fourth quarter of 2021.
Design Researches in Making In-Situ Thermal Foam System as a New Enhanced Heavy Oil Recovery Method
Authors: Kozhin Vladimir Nikolaevich , Mikhailov Andrey Valerevich , Pchela Konstantin Vasilievich , Kireev Ivan Ivanovich , Demin Sergey Valerevich , Roschin Pavel Valerevich , Nikitin Aleksandr Valerevich 
Published: October 2021

Abstract
The paper presents the results of lab and filtration studies aimed at improving the procedure of thermal/gas/chemical effect (TGCE) with the generation of thermogenic system in reservoir conditions, proposed as an alternative to the methods of increasing oil recovery, such as water-gas effect procedure and foam injection process. The objects of research were thermal/gas generating compositions at the basis of sodium salts of sulfamic and nitric acids. Moreover, the influence of the ionic composition of the aqueous solution and temperature on the surface properties of the attracted solutions of surfactants (surfactants) was also evaluated.
Filtration tests have shown that the use of a thermal/gas generating composition leads to additional displacement of high-viscous oil. The introduction of surfactants in the thermal/gas generating composition promotes foaming in the porous medium of the reservoir model and prevents gas breakthrough that leads to an increase in the oil displacement factor up to 24 %.
Determination of Adsorption-Retention Constants and Inaccessible Pore Volume for High-Molecular Polymers
Authors: Fedorov Konstantin Mikhailovich , Pospelova Tatyana Anatolyevna , Kobyashev Aleksandr Vyacheslavovich , Gilmanov Aleksandr Yanovich , Kovalchuk Tatyana Nikolaevna , Shevelev Aleksand Pavlovich 
Published: October 2021

Abstract
The application of chemical enhanced oil recovery methods is based mainly on data from experiments. Determining the adsorption constants without destroying the sample remains a relevant problem. It is necessary for accurate data. The determination of filtration parameters of high-molecular polymers in a porous medium using special model is considered in this paper. The aim of the investigation is the solution of inverse problem of polymer transport with adsorption. The key data for this are the characteristic times of the polymer front propagation, water and rock densities, porosity, and initial polymer concentration. The solutions of the direct problem and the inverse problem from the characteristic form of equations are obtained. The algorithm of interpretation of adsorption-retention parameters and inaccessible pore volume form non-destructive experimental studies is developed. Comparison of the calculated values of the inaccessible pore volume with the results of laboratory studies leads to an error within 10%. The practical application of the algorithm was carried out using the data obtained in previously conducted experiments.
Design of Laboratory Studies to Develop the Chemical Formulation for Surfactant-Polymer Flooding
Authors: Gospodarev Dmitry , Lymar Igor , Rakutko Aleksandra , Antuseva Anastasia , Tkachev Dmitry 
Published: October 2021

Abstract
Nowadays, chemical EOR methods are becoming more and more relevant, among which the alkali-surfactant-polymer flooding is of particular interest. The efficiency of this technology largely depends on the correct choice of the components of chemical formulation, which should be based on a set of laboratory experiments carried out in a given sequence.
This paper presents a methodological approach to laboratory studies in order to develop an optimal surfactant-polymer formulation, taking into account the geological and physical characteristics of the target field and the properties of reservoir fluids.
The experimental part of the research work was carried out in several stages, involving the analysis of the physicochemical characteristics of reservoir oil, the screening studies of surfactant and polymer samples, as well as a series of coreflood tests with a selected chemical formulation on the terrigenous reservoir models.
During screening studies, the solubility and compatibility of the chemical components, the phase behavior of surfactant solutions with oil at different salinity values and water-oil ratios, static adsorption of chemicals on the rock and their thermal stability at reservoir temperature were investigated. Optimization of the chemical formulation was based on the results of IFT measurements of the surfactant solutions and rheological studies of the polymer solutions.
At the stage of coreflood tests, physical simulation of the surfactant-polymer flooding was carried out on reservoir models using natural core material in order to optimize the composition and slug size of the developed chemical formulation. The obtained results of the displacement experiment were matched by numerical 1D simulation.
Based on the results of the studies performed, an effective surfactant-polymer formulation has been designed, which provides the ultra-low IFT (2.8·10−4 mN/m) values and the ability to form stable middle-phase microemulsions when interacting with oil. The findings of thermal stability and static adsorption experiments confirmed a feasibility of selected chemicals for practical application. Within the framework of the study, the key technical parameters of proposed formulation were determined, which are required for up-scaled simulation study of the chemical flooding process at pilot site.
Construction of a Multipurpose Exploration Well in the Jurassic Deposits Subsequent Transfer to Production Enabled by Metal Expandable Barrier Installed Behind the Casing
Authors: Lebedev Ivan Valentinovich , Gabdullin Aydar Razinovich , Korepin Oleg Vasilievich , Dubitskit Sergey Stanislavivich , Novikiv Sergey Vladimirovich , Feklenkov Sergey Victorovich 
Published: October 2021

Summary
The resource base of the north of the West Siberian oil and gas province is the basis of Russia's energy strategy. Among the northern territories of the province, the Nadym-Purskaya, Pur-Tazovskaya and Yamal oil and gas regions (OGRs) are the leaders in terms of estimated gas reserves (Figure 1). However, the largest deposits of the first two OGRs are in the stage of falling production. Therefore, the main prospects should be associated with the Yamal OGR, which has not yet been put into active operation. It is logical that along with the development of traditional methods of extraction of "dry" natural gas, the government of the Russian Federation has approved a plan for the production of liquefied natural gas based on the fields of the Yamal Peninsula, which is currently being actively implemented by PJSC "NOVATEK". (https://www.novatek.rU/m/business/exploration/)
Successful Application of a New Generation of Clay Inhibitor Polymers While Drilling a Deep Exploration Well in the Astrakhan Region
Authors: Ryabtsev Petr Leonidovich , Popov Sergey Viktorovich , Korolev Andrey Vladimirovich , Urakov Samat Maratovich , Akvilev Andrey Aleksandrovich 
Published: October 2021

Abstract
This paper presents the results of laboratory studies and field application of a drilling fluid based on a new generation of polymer inhibitors. The summarized results of the application confirm the effectiveness of the new polymer type used.
The body of the article is devoted to the experience of using an innovative drilling fluid system for drilling an exploration well in the Astrakhan gas condensate field. One of the features of the Astrakhan gas condensate field is a number of intervals of possible complications: lost circulation zones, prone to clay swelling and caving, and presence of salts and hydrogen sulfide in the reservoir. One of the solutions for ensuring trouble-free drilling in such conditions is using an oil-based drilling fluid (OBM). However, OBM is often avoided when drilling exploratory wells due to environmental and technological limitations. In this connection, the project team carried out work on selection and development of a water-based drilling fluid formulation, which would ensure the most trouble-free and cost-effective drilling operations.
Considering these studies, a drilling fluid was selected based on a new generation of inhibitor polymers. The key feature of the proposed formulation is the use of a new polar inhibitor polymer. The selected formulation showed the best laboratory test results after which it was approved for application. The main risk of using the new drilling fluid formulation was lack of filed experience in using this system in similar geological conditions. At the same time, laboratory tests showed that the proposed alternative mud formulations did not provide the required level of contamination resistance and inhibiting ability.
Over the period from April to September of 2020, the exploration well was successfully drilled at the Astrakhan gas condensate field using the selected drilling fluid based on a new polymer type. Using the same drilling fluid type, four intervals - from the surface pipe to the production liner, - were drilled.
An Integrated Approach to Efficient Drilling through Unstable Coal Intervals Using Different Types of Mud in the Yamal Region
Authors: Kabanov Alexander Viktorovich , Galimkhanov Aydar Ramilevich , Kharitonov Andrey Borisovich , Matsera Alexander Mikhailovich , Pogurets Valery Viktorovich , Mavlyutov Ruslan Shamilevich , Dolmatov Denis Vladimirovich , Sokovnin Sergey Anatolyevich 
Published: October 2021

Abstract
This article is a description of an integrated engineering approach to solutions selection for efficient and safe drilling of unstable intervals represented by interbedded coal and argillite layers. Due to specific features of these formations, any significant mechanical stress, as well as penetration of drilling fluid filtrate, may lead to wellbore instability regardless of the drilling mud type used. The paper presents a description of the features of drilling in unstable intervals with various types of drilling muds (WBM/OBM) in Yamalo-Nenets Autonomous Okrug (YNAO).
Experience has shown that drilling through coal intervals prone to instability may cause significant non-productive time (NPT). Such wells should be designed with an integrated engineering approach, which covers the entire cycle: starting with the well path planning, casing setting depths selection, BHA design and drilling regimes of the risk interval. No less important, detailed development of solutions for drilling muds.
During the study the main causes of issues in wells drilled through the interbedded formations of coal and argillites in two fields were identified. As a result, a set of measures was developed to minimize risks for each type of mud (OBM and WBM):
– Revision of the initial well design solutions. Selection of optimal mud weight based on the experience gained and the geomechanical model – Revision of chemicals concentrations together with the use of additional additives – Placement of stabilizing pills across unstable intervals – Well path optimization – Development of safe drilling procedures.
The measures developed for various types of drilling muds allowed minimizing the NPT and successfully completing the wells on time. The experience gained formed the basis for recommendations to prevent issues associated with the coal layers instability in the region.