bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparison of Telehomecare Interventions in Controlling Chronic Obstructive Pulmonary Disease (COPD): Protocol for a Systematic Review and Meta-analysis
Authors: Shoyukhi Zohreh , Dehghani Mahmoodabadi Arezoo , Dehghan Hamid Reza 
Published: October 2021

Background: Chronic obstructive pulmonary disease (COPD) is considered the fourth main cause of mortality worldwide, affecting 10% of adults aged up to 40 years. Due to the growing elderly population and smoking, the global burden of COPD is expected to increase in the general population. Telemedicine may help patients with COPD to decrease exacerbation episodes and the associated costs. Moreover, Telehomecare (THC) may be considered as an alternative to cut down hospitalization costs and increase the patients’ comfort.
Objectives: This study explains the methodology of a systematic review and meta-analysis designed to evaluate the impact of THC interventions on the control and management of COPD and its complications.
Methods: To review all published studies comparing THC interventions in controlling COPD and its complications, all studies published in PubMed, Google Scholar, Scopus, ISI Web of Science, Cochrane databases, HTA EED, DARE, Embase, SID, Magiran will be searched until the end of 2021. Randomized controlled trials (RCTs), cluster RCTs, controlled clinical trials comparing telehealth with standard monitoring of COPD patients were included. Independent reviewers will review the abstracts and full-texts of all relevant studies for eligibility, risk of bias, and data extraction using structured forms. The meta-analysis will be performed for adequately homogenous studies regarding their populations, interventions, and objectives.
Conclusion: The results of this systematic review and meta-analysis will provide useful information on the impacts of THC on COPD control. The evidence provided by this systematic review can be helpful for clinical specialists, public health policymakers, and the general population.
Study of the Efficiency of Gel and Polymer-Stabilized Foam Systems for Gas Shut-Off in Horizontal Wells
Authors: Zvada Maiia Vladimirovna , Belovus Pavel Nikolaevich , Sergeev Evgeny Ivanovich , Glavnov Nikolay Grigorevich , Varfolomeev Mikhail Alekseevich , Saifullin Emil Rinatovich 
Published: October 2021

Abstract
This article describes the assessment of effectiveness of gel and foaming agents for gas shut-off treatments in horizontal wells. The research is carried out through the implementation of a complex of special laboratory studies and analysis of the results using numerical modeling methods.
A list of necessary laboratory experiments to minimize risks when carrying out work to limit gas inflow has been formulated, and approaches to carrying it out have been described. The program includes: free volume studies, filtration on linear and parallel core models. The results confirm the importance of studying not only the agent's physical characteristics at the reservoir conditions, but their interaction with reservoir fluids.
The influence of different agents on the mobility of gas and oil was assessed as a result of linear core flooding experiments. In addition, the filtration tests on parallel cores were carried out aimed to determining the saturation selectivity.
The series of numerical calculations was performed for the subsequent determination of the technological and economic effects of the treatment with gas blockers.
Planning of Pilot Injection of Surfactant-Polymer Composition to Improve Oil Recovery from Carbonate Reservoir of Kharyaga Oilfield and Evaluation of the Results
Authors: Trushin Yuri Mikhailovich , Aleshchenko Anton Sergeevich , Zoshchenko Oleg Nikolaevich , Arsamakov Mark Suleimanovich , Tkachev Ivan Vasilevich , Kruglov Dmitry Sergeevich , Kornilov Alexey Viktorovich , Batrshin Denis Radikovich 
Published: October 2021

Abstract
The paper considers the use of a surfactant-polymer composition for the mobilization of light paraffinic oil from the D3-III carbonate reservoir at a reservoir temperature of 62°C, as well as the results of its tests in field conditions. Earlier, the composition showed its effectiveness on model carbonate cores with salinity from current (50-80 g/l) to reservoir (up to 170 g/l), in the presence of surfactants, type III microemulsions according to Winsor with oil were obtained.
Based on the results of the filtration experiments performed on our own core from the productive formation D3-III, an increase in the displacement efficiency of surfactant-polymer compositions compared to water was obtained 11–14% (with a total surfactant concentration of 1%), irreversible surfactant losses in water-saturated rock–up to 0, 38 mg/g.
Displacement efficiency after water and surfactant-polymer composition flooding was also estimated in the field conditions using SWCTT; its results were interpreted by various methods (analytical, in a hydrodynamic simulator), and also compared with laboratory results.
Within a single-well tracer test, an assessment of the residual saturation after water filtration and injection of a surfactant-polymer composition was carried out under the following conditions: the target research radius is 3.5 m; porosity 10%, effective reservoir thickness 38 m. Based on the results of SWCTT, an increase in the displacement efficiency of 16.7% was obtained in comparison with water displacement (total surfactant concentration 1%) using an analytical method of interpretation. The adaptation of the SWCTT results on the hydrodynamic model was carried out, the most influencing parameters on the quality of adaptation were determined.
The selection and justification of a pilot area for a multi-well pilot project was carried out, a sector hydrodynamic model of the site was built, and calculations were made to assess additional oil production.
A Comprehensive Project of Thermal, Gas and Chemical EOR Method Application for Bazhenov Shale Formation
Authors: Ushakova Alexandra , Mukhina Elena , Scerbacova Alexandra , Turakhanov Aman , Bakulin Denis , Cheremisin Alexey , Kasyanenko Anton 
Published: October 2021

Abstract
The article describes the development aimed at a comprehensive study for enhanced oil recovery methods (EOR) of the Bazhenov shale oil formation. Potentially effective technologies for low-permeable reservoirs are under consideration: injection of associated petroleum gas in the mode of miscible displacement to recover light oil; injection of the surfactants water solutions, to separate sorbed hydrocarbons from the rock and change core wettability; and heating technologies to convert solid hydrocarbons into liquid and gaseous, and recover.
The project explore potentially effective EOR technologies and their influence on the various types of hydrocarbons of the shale Bazhenov formation: mobile oil in closed pores, sorbed and solid (kerogen) hydrocarbons. Experimental studies were carried out: the selection of the gases composition, the selection of surfactant compositions, the study of the possibility of thermal exposure by over-heated water injection. The project is currently at the stage of determining the effectiveness of each method, selecting a technology for specific field conditions and identifying which hydrocarbon resources each method is aimed at extracting.
Calculation of Graded Viscosity Banks Profile on the Rear End of the Polymer Slug
Authors: Tikhomirov Sergey , Bakharev Fedor , Groman Andrey , Kalyuzhnyuk Alexander , Petrova Yulia , Enin Aleksanr , Kalinin Konstantin , Rastegaev Nikita 
Published: October 2021

Abstract
One of the motivations for EOR methods is the possible instability of the front between phases with high contrast of mobility. Highly viscous polymer slug partially solves the problem by stabilizing the front between water and oil. During further water displacement viscous fingers might appear on the rear end of the slug, and their breakthrough might reduce the oil recovery factor. In the paper we study the size of the mixing zone on the rear end of the slug and further the development of the graded viscosity banks technology (GVB or tapering) to reduce the volume of used polymer without loss of effectiveness.
Injection of Low-Salinity Water as an Integral Part of Enhanced Oil Recovery Programmes for Carbonate Formations of the Central-Khoreiver Uplift Oilfields
Authors: Kornilov Alexey Viktorovich , Tkachev Ivan Vasilievich , Fomkin Artem Vacheevich , Petrakov Andrey Mikhailovich , Batrshin Denis Radikovich , Fursov Grigory Aleksandrovich , Ponomarenko Denis Mikhailovich , Fedorchenko Gennadiy Dmitrievich , Sansiev Geroge Vladimirovih 
Published: October 2021

Abstract
The paper describes the process of evaluation of low salinity water composition to improve the development of hydrophobic carbonate formations of Central-Khoreiver Uplift (CKU) fields with relatively high oil viscosity (5-15 mPa·s) and average formation temperature 70°C. The sources of low salinity water were determined, prospective composition for water injection were analyzed. The efficiency of oil displacement by formation water and low salinity water are observed during the spontaneous imbibition experiments and coreflood tests to compare the efficiency of formation and low salinity water. The expected incremental displacement efficiency for the target carbonate formations can vary widely, from 1 to 10%.
Linear models of the completed coreflood tests and a sector hydrodynamic model of the prospective trial injection are built, considering the basic chemical processes while mixing different types of water. We also review the prospects of joint application of low salinity water injection and chemical EOR methods.
High Density Foamed Cement Application for Channeling and Behind-the-Casing Flows Minimization in the Production Zone
Authors: Fomenkov Alexey Vladimirovich , Pinigin Ilya Igorevich , Tsibulsky Mikhail Alexandrovich , Terentyev Dmitry Yurievich , Fedyanin Artem Alexandrovich 
Published: October 2021

Abstract
This article describes the application of relatively high-density foamed cement for cementing wells in the Volga and Urals region. Good cementing practices with high density or conventional density cement slurry is required to ensure mud displacement in fluid saturated intervals of reservoir formations (Benge et al; 1982). With this requirement met, the cement column should circumferentially cover the annulus at this very interval which is exposed to the highest loads. However, due to limited physical and mechanical properties of conventional cement slurries in both liquid and solid state, in certain cases conventional slurries do not solve the problems encountered by the Customer, namely elimination of annular flow between the casing and cement sheath. High-density foamed cement is considered as an improved alternative to conventional cement slurries, and results in a high quality and durable sealing of gas and oil saturated production zones for the life of the well.
Proprietary software and process equipment are used for the mixing of the foamed cement slurry with a variety of foaming properties. This process enables the use of a base cement slurry with higher density (up to 2.1 g/cm3) for delivering foamed cement slurries in a wide range of densities. To avoid possible cross flows behind the casing, pilot tests were conducted, where a conventional cement slurry (1.80–1.90 g/cm3) was replaced with a high-density foamed cement slurry with equivalent density with a foam quality of approx. 10% making the cement sheath elastic with improved adhesion to both the casing string and the formation (Spaulding et al; 2018). Pilot tests, incorporating the cementing of several production casings, were conducted where only foamed cement slurries with various foam quality were used in the entire cementing interval. No conventional (non-foamed) cement systems were used in these cases.
Quantification of the Loss Conduit Aperture During Lost Circulation in Fractured Carbonates
Authors: Ruzhnikov Alexey , Johnson Ashley 
Published: October 2021

Abstract
Fractured carbonate formations around the world are prone to lost circulation that not only affects the well construction process but creating a longtime effect on the wellbore integrity. Despite multiple attempts to cure them the success rate is usually low. This manuscript is aiming to provide a new vision on the reason of lost circulation across carbonates.
To have better understanding of the complete losses across the fractured carbonates the series of studies were initiated. At first to understand the strength of the loss zone the fracture closing pressure was evaluated via study of the fluid level in the annulus and back-calculation of the drilling fluid density effect on it. Secondary, the rock properties across the loss circulation zones were studied by using the microresistivity images, dip data, and imaging of fluid-saturated porous media. At last, the trial tests with different treatment materials were performed to evaluate the effect of it on curing the losses.
The results of the studies brought new information and explained some previous unknowns. The formation strength across lost circulation zone was measured and it was confirmed to remain constant despite other changes of the well conduction parameters. It was also confirmed that the carbonates are naturally highly fractured having over 900 fractures along the wellbore. The lost circulation zone was characterized, and it was confirmed that the losses were not related to the fractures but rather to the karst, dissolution and to mega-fractures. The size and dip of the fractures were identified, and it was proven the possibility to treat them with conventional materials. However, the size of identified mega-fractures and karst zones exceed the fractures by 100 times in true vertical depth, and in horizontal wells the difference is thousands times due to measured depth. This new information explains the previous unsuccessful attempts with the conventional lost circulation materials. Further based on the newly available information the mathematic description of the lost circulation zones was provided.
The First Multilateral Well in Eastern Siberia on the Separated Oil Reservoirs
Authors: Gataullin Ruslan Fanisovich , Ter-Saakov Stanislav Evgen’evich , Nikulin Evgenij Vladimirovich , Stifeev Dmitriy Pavlovich , Filatov Alexey Vyacheslavovich 
Published: October 2021

Abstract
This article describes engineering and technology solutions developed to successfully construct unconventional and unique horizontal well at the field of Eastern Siberia targeted to two isolated formations with an option to shut-off top Botuobinsky horizon after gas breakthrough and produce oil from underlying Ulakhansky bed further on. As oil-water contact in the lower part of Ulakhansky horizon makes fracturing the well inexpedient, multi hole drilling technology was implemented enabling drainage of the reserves that are far from the main borehole.
The main objective of this well is to deplete Botuobinsky horizon subsequently shutting it off and continuing to recover petroleum reserves from Ulakhansky pay zone. Constructing such well is cost-effective, as it requires drilling only one intermediate casing interval instead of two.
Accumulated experience of drilling and completing multi hole wells was used to ensure successful well construction; also, geological and stratigraphic data as well as possible complications while drilling Botuobunsky and Ulakhansky formations were analyzed in-depth.
The following appliances were selected to meet the objective:
– Bottom-hole equipment enabling drilling abrasive formations under conditions of high vibrations; – Special line of drill bits to ensure high ROP and successful sidetracking without additional tripping; – RSS with 152.4 mm drill bit.
The goal set by the operating company was achieved through multi-faceted approach to performing the task, efficient cooperation of engineering technical services and continuous monitoring of output data while drilling. All that combined delivered the results listed below:
– Sidetracks were carried out in an open horizontal hole without cement plugs and additional tripping for drill bit or BHA. – Minimized bottom-hole equipment failures under condition of increased high-frequency vibrations from bit while drilling hard formations due to implementation of modular PDM with data-transmitting channel. – Minimized bottom-hole equipment failures under condition of increased low-frequency vibrations from drill string with Hard Bending due to improved BHA design and optimized drilling parameters selection. – Liner was effectively run to Botuobinsky and Ulakhansky reservoirs with an option to shut-off the former after depletion and gas breakthrough.
This well is the first one targeted at two isolated formations in East Siberia.
A Set of Solutions to Reduce the Water Cut in Well Production
Authors: Isaev Anatoliy Andreevich , Takhautdinov Rustem Shafagatovich , Malykhin Vladimir Ivanovich , Sharifullin Almaz Amirzyanovich 
Published: October 2021

Abstract
This paper presents a set of activities to reduce water cut and develop a technical solution to measure water cut:
measurement of watercut, flow rates and gas-oil ratio of a well output using a mobile unit. tracer tests and conformance control operations - watercut of reacting wells within Bashkirian stage decreased by 16,6% after those operations were performed. water flow control, flow deviation and remedying production casing damages made it possible to reduce extraction of produced water and, accordingly, the cost of oil production. development of Liquid Phase Separation Device enabled alternate delivery of oil and water to the intake of downhole pump.
Prospects of Electric Drilling for the Development of Well Construction Technologies
Authors: Perelman Oleg Mikhailovich , Fadeikin Aleksandr Sergeevich , Gelfgat Mikhail Yakovlevich , Geraskin Aleksandr Sergeevich , Emirov Ziyadhan Abdusalamovich 
Published: October 2021

Abstract
The purpose of this work is to analyze the prospects for efficiency increasing of high-tech wells construction using a drilling complex based on downhole permanent magnet motor.
For the first time, the article provides information about new drilling complex. Considered technology could provide a breakthrough in drilling high-tech wells. This technology combines advantages of drill string with electric wire and an ideal downhole motor with a wide rotational speed range, regardless of the type and flow rate of circulating agent.
The article provides a brief comparative analysis of electrodrilling implementation results "generation 70s", the composition of new electric drilling complex and its difference from the previous one are considered in details. Complex meets the requirements of high-tech wells construction and allows automating drilling process using ultra-high-speed bi-directional data transmission channel and quickly assessing the parameters of drilling regime and direction of drilling, characteristics of rocks, pressure and temperature distribution along the wellbore. Permanent magnet motor ensures optimum drilling parameters for rock destruction at the bottomhole, regardless of the well profile and the type of circulating agent, including managed pressured drilling. Effectiveness of accidents prevention and mitigation is increased.
Authors propose to discuss the prospects of electrodrilling technology using downhole permanent magnet motor, which is currently at TRL-3 level, to assess and specify adopted concept of electrical drilling complex development.
Development and Implementation of the Technology of a Mobile Gas-Lift Complex For Transferring Wells of the Block-Conductor of the Field Named After Yu. Korchagin For Artificial Lift
Authors: Zavyalov Alexsandr , Yazykov Ivan , Nukhaev Marat , Rymarenko Konstantin , Grishenko Sergey , Golubtsov Alexsandr , Aitkaliev Galymzhan , Kabanov Vasilii 
Published: October 2021

Abstract
This paper is aimed at the mobile gas-lift unit installation workup to shift the wells of the conductor platform of the Yu. Korchagin field to mechanized extraction instead of constructing a gas lift pipeline. The paper presents all the stages of this technology implementation, from conceptual design, engineering calculations, to the economic feasibility study, implementation and operation of this unit.
During the operation of the wells of the conductor platform at the Yu. Korchagin field, the following problem occurred: a gas-lift gas pipeline was not constructed from the offshore ice-resistant fixed platform to the conductor platform, as they wanted to shift the wells to the mechanized extraction method (artificial lift). An alternative option to provide gas-lift gas to the wells of the conductor platform is to install a mobile gas-lift unit directly on an unmanned platform.
This mobile gas-lift unit will be a compact separator of a gas-liquid mixture from a donor well, and it will pipe a separated gas-lift gas supply system with control and flow metering sets into the production wells. This system enables a shift of the wells of an unmanned conductor platform to a compressor-less gas-lift operation and a remote regulation of production and control over the wells operation.
Technology For Oil Production Wells Drawdown and Gor Control For Oil Rim Reservoir Development on the Yurubcheno-Tokhomskoye Field.
Authors: Dadakin Nikita , Nukhaev Marat , Rymarenko Konstantin , Grishenko Sergey , Aitkaliev Galymzan , Kabanov Vasilii , Gusachenko Tatyana , Zaitsev Alexandr 
Published: October 2021

Abstract
One of the critical tasks during the oil rim development is to control production wells to prevent water breakthroughs and gas outs. Key factors are control over drawdown and on-time choke restriction of the well in case of a gas out and an extreme gas factor increase.