bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integrated Approach to Diversion During Acid Treatments in Extended Intervals, High Temperature and Fractured Reservoirs
Authors: Abdrazakov Dmitriy , Kalabayev Ruslan , Stepanov Vladimir , Juldugulov Yeltay , Kinnear Campbell , Bekmakhanbet Darkhan 
Published: October 2019

Abstract
Achieving complete wellbore coverage is a challenge for any acidizing treatment performed in a heterogeneous fractured carbonate formation with long intervals. Openhole sections, high temperature, and the presence of depleted layers make the task of acidizing design optimization even more difficult. Existing acidizing diversion studies concentrate either on strongly theoretical or on purely field applications. Coupling these two directions is complicated because of different perceptions of diversion principles and diverting method classification.
The current study introduces a simple and robust diversion method classification and covers both theoretical and practical analysis of the diversion in the fractured carbonates. It is explained in the given study why the maximized rate method cannot be considered as a proper diversion method in fractured carbonates according to the suggested classification. Theoretical aspects of the study also cover the selection criteria suggested for the amount of acid preceding the diverter stage in fractured carbonate formations. A calculation methodology is introduced for the skin caused by the particulate filter cake, with respect to the different fracture plugging scenarios and for the skin development in time.
Practical aspects of the study cover field cases with successful diversion results in a variety of extreme conditions: very long openhole intervals (&gt;1,000 ft), horizontal sections, depleted layers, extremely vuggy and fractured formations, hot formations (&gt;260°F), and restricted completion entry wells. Diversion examples include pressure increase signatures of up to 1,500 psi for skin-forming diverters and 500 psi for viscosified ones. Each field case contains a quantitative interpretation of the diversion according to the skin calculation method introduced in this study.
High Rate Hybrid Fracturing in South-Priobskoe Field
Authors: Vikhman Ivan , Barinov Alexandr , Kolupaev Dmitry , Chebykin Nikolay , Uchuev Ruslan , Mavletkulov Ural , Vereschagin Sergei , Pavlova Svetlana , Sypchenko Stella , Valnev Dmitry 
Published: October 2019

Abstract
The South-Priobskoe Field is one of the largest oil pools in Western Siberia, with a unique category of reserves. Due to the low filtration properties of the productive formations AS10-AS12 (permeability of which is not more than 3 mD), the drilling of horizontal wells with subsequent multi-stage hydraulic fracturing (MSHF) completion is the most cost-effective way in this case. The use of highly viscous fracture fluids (at least 400 cP at 100 s-1) and 16/20 mesh proppant with a maximum concentration of 800-900 kg/m3 and the slurry rates are not exceeding 4.0 m3/min, became a kind of standard during the MSHF. However, a steady decline of permeability in the newly drilled areas of the field is observed (below 0.5 mD), because of this, an effective half-length of cracks begins to make an increasing contribution to oil production. This paper describes the introduction of non-standard methods of hydraulic fracturing for a traditional reservoir, and an idea was the use of low-viscous fluids with increased slurry rates, which resulted in an increase in well production rates by an average of 7%.
A Hybrid Model for Selecting Horizontal Candidate Wells for Re-Fracturing of Tight Oil Reservoirs—A Case Study in the Baikouquan Formation, North Mahu Oil Field, Western China
Authors: Yang Zhaozhong , He Rui , Chen Jianlin , Li Xiaogang , Xie Bin , Meng Jigang , Li Wenhong 
Published: October 2019

Abstract
The North Mahu Oilfield in western China contains abundant tight glutenite oil resources. The use of horizontal well fracturing has become the main development method in the region. However, the tight oil reservoirs have poor physical properties. After a period of production, some hydraulic fractures in the horizontal wells close, resulting in rapid decline in production. Therefore, Re-fracturing must be implemented to restore and increase oil production. In this paper, a comprehensive evaluation model for the horizontal well selection of tight oil re-fracturing is established, and a three - hierarchy system including the target layer, the criterion layer and the scheme layer is structured. The analytic hierarchy process (AHP) method, grey correlation (GR) method and entropy weight (EW) method are used to calculate the weights of factors influencing re-fracturing effects, and TOSIS method is combined to quantify the re-fracturing potential of the candidate wells, so that well H is selected to implement re-fracturing construction based on the established mathematical model. From the aspects of oil reserves, reservoir energy, wellbore conditions and reservoir fracability, the feasibility of re-fracturing of well H was carried out, and the degradable granular chemical diverting agent was preferentially used. The design of "re-open old fractures + perforate new holes+ supply reservoir energy+ real time microseismic monitoring" was designed. Re-fracturing construction of well H was implemented smoothly, and the obtained stimulated reservoir volume (SRV) exceeded 107m3. According to the production data, the daily oil production continued to rise initially, which was once over 30t/d.
Increase in Profitability Ratio of Hydraulic Fracturing for Multi-Layer Formation
Authors: Mardamshin Ruslan 
Published: October 2019

Abstract
It is the purpose of this paper to search for options to improve technical and economic efficiency of hydraulic fracturing. The paper presents conventional hydraulic fracturing technologies at multiple development targets and interval frac technology using diverter soluble balls for directional wells under the conditions of multiple development targets. The paper also presents experience of technology application at the enterprise and economic analysis (costs reduction for workover actions).
The technology is based on application of diverter soluble balls and it allows performing selective hydraulic fracturing for two and more productive formations for one packer trip-in and one frac fleet approach thereby enabling considerable reduction in the time and increasing the economic value of actions. The main elements of the process are diverter balls which plug (creating a temporary artificial overlap) perforated intervals of the first development target after fracturing at a continuous process, enabling flow redistribution and deviation of frac drive fluid to lesser permeable second frac development target. The process is continuous as follows DFIT, frac #1, diverter balls injection, frac #2.
Diverter balls have been tested in the enterprise’s labs against characteristics and properties, compatibility of products with formation fluids. Frac technology using diverter balls has been successfully tested as part of the pilot project and it is applied at the enterprise on a commercial scale enabling reduce costs for workover crew’s work by 23%, workover actions – by 20%, increasing profitability of frac workover actions for both an existing producing well stock and at the cost of a new well stock drilling. It is worthwhile noting that the existing conventional frac equipment allows applying the technology. It does not need special upgrading. The technology applicability criteria are identified. Success of works which have already been performed is over 95% and it is approved by well logging to determine flow profile. The technology application allows involving into development all low productive formations of dissected section with a considerable reduction in the time and workover action costs.
Experience in Application of Hydraulic Fracturing Techniques in Carbonate Deposits at the Perm Krai, Republic of Komi and Nenets Autonomous District Fields. Ways to Improve Efficiency
Authors: Sharafeev Ramil , Drozdov Sergey , Novokreshchennykh Dmitriy 
Published: October 2019

Abstract
Most remaining recoverable reserves (more than 62%) of the Perm Territory, Komi Republic and Nenets Autonomous Area (NAA) are concentrated in the carbonate reservoirs, so effective reserve recovery from the carbonate formations is a topical problem at present.
Productive deposits with the carbonate-type reservoirs are confined to the Silurian, Lower Devonian, Upper Devonian-Tournaisian, Serpukhovian, Middle and Upper Carboniferous, and Lower Permian sediments. The production zones are characterized by a wide range of changes in the geological and physical parameters (Table 1).
Expanding Boundaries of Multistage Hydraulic Fracturing with Coiled Tubing at Soft Terrigenous Reservoirs
Authors: Simakov Sergey , Kichigin Anatoly , Kurtsev Sergey , Trifonov Andrey , Karpov Maxim 
Published: October 2019

Abstract
Today, given the deterioration in the quality of proven reserves, a separate and extremely important issue is the possibility of using multi-stage hydraulic fracturing (MSF) in wells with complex geology. A striking example of the successful use of MSF using CT is the experience gained at the Messoyakha oil and gas condensate field, where the MSF was successfully carried out for hard-to-recover (HTR) reserves of viscous oil occurring in weakly consolidated terrigenous reservoir at low temperatures.
At this stage of oil industry development, fields that are considered previously unprofitable, the so-called HTR, are increasingly involved in the development. The experience of Messoyakha oilfield is perhaps the most extensive in Russia in terms of testing various systems and strategies for completing horizontal wells with MSF in viscous oil, occurring in weakly consolidated sandy reservoirs at shallow depths and at low temperatures. Conducted work and conclusions can be used in the design and evaluation of similar in structure hard-to-recover reserves.
The Sakhaling Offshore Field 4D Geomechanical Modeling for Fracturing Planning
Authors: Ganaeva Milena 
Published: October 2019

Abstract
The article presents the practical results of the building of a four-dimensional Mechanical Earth Model of the field on the Sakhalin shelf. An analysis of the stress regimes, both regional and local, was carried out. The model was built on an extensive data set, including core and wellbore studies, special logging and leak test results, and allowed to evaluate the initial and current stress-strain behavior, reservoir compaction, stress re-orientation. The article also details the methodology and details of building a four-dimensional Mechanical Earth Model which can be useful for specialists in this area.
Important practical problems were solved on the model - the technological efficiency of MSHF was proved and the efficiency of expensive compaction drilling was increased in offshore conditions. In addition, the risks associated with the first MSHF planning in the region were evaluated, such as the fracturing of the hydraulic fracturing crack into overlying aquifers, the development of crack in the horizontal direction, as well as uncertainties caused by a limited set of data.
Geological and Hydrodynamic Data 3D-Visualization Library
Authors: Perepelitsa Elena , Sayko Andzhelika , Babichev Emily 
Published: October 2019

Abstract
As part of this work, a three-dimensional interactive visualization library for rendering geological and hydrodynamic models' objects was implemented. The main functional capabilities of the library are described, and a comparison with commercial and free alternatives is made.
The library has been successfully integrated into software products for hydraulic fracturing modeling, geological and geomechanical modeling, and is being used by specialists in daily work.
The performance of our library is comparable to commercial counterparts. This is confirmed by measurements of the screen refresh rate and the amount of RAM usage when displaying models of real reservoirs using our visualizer in comparison with the visualizers of software products of competitors.
Modification of the Unconventional Reserves’ Exploitation Approach Based on the Reservoir’s Stress-Deformed State Management
Authors: Murtazin Ramil , Fedorov Alexander , Savchenko Pavel , Mulyukov Damir 
Published: October 2019

Abstract
Based on the experience of developing hard-to-recover oil reserves in fields, a new technology has been proposed that allows increasing the productivity of producing horizontal wells by creating HFF cross cracks and minimizing the risks of auto-HFF cracks fracturing from injection wells.
Reagentless Preparation of Formation Water for Reservoir Pressure Maintenance System in Low Permeable Oil Reservoirs. Water Ozonation Method
Authors: Shumeiko Andrei , Polubojartsev Dmitriy 
Published: October 2019

Abstract
Currently, oil fields with complex reservoir properties are involved in the development of Russian oil Company (for example, Severo-Danilovskoye, Danenberg, Vostochno-Tokayskoye field (Korotkova M.H. et. al, 1998)), in which high requirements are imposed on the degree of preparation of formation water for injection into the reservoir pressure maintenance system. The supply of prepared water to the reservoir pressure maintenance system significantly improves oil production conditions and slows down the deterioration of reservoir properties. This ensures the displacement of oil from a larger number of pore-fractured channels, which increases the oil recovery factor.
In this connection, the technology capable of solving the problems of preparing formation water for the reservoir pressure maintenance system at fields with low permeability of oil reservoirs is considered for implementation in the present work. Also, the solution of the production problem of cleaning the injected agent into the reservoir pressure maintenance system from hydrogen sulfide is considered to prevent deterioration of reservoir properties of the formation. The reagent-free method of formation water preparation is proposed as the described technology, in this case, the ozonation method.
The main technological advantage of this method is the possibility of simultaneous purification of contaminated formation water from oil products and bacterial impurity, which can cause contamination of the formation with sulfate-absorbing bacteria (SHvelev T.G.,2005).
Divert Technology Pilot on Kharyaga Field
Authors: Trushin Yuri , Aleshchenko Anton , Danilin Kirill , Arsamakov Mark 
Published: October 2019

Abstract
A global trend to introduce enhanced oil recovery (EOR) methods at the early field development stages has been recently observed. Zarubezhneft group is no exception in this regard. Early introduction of EOR methods makes it possible to achieve higher process efficiency, and, first and foremost, economic efficiency.
This article describes a pilot project involving implementation of diverter technologies at the field with complex carbonate reservoirs.
The following aspects have been reviewed: the structure of the Kharyaga D3-III reservoir, main issues related to the reservoir development and ways to resolve such issues. Laboratory studies of the applied compositions’ properties, as well as filtration experiments have been described. The article also presents an overview of the available diverter technologies.
The article also describes field implementation of the operations completed, namely, criteria for interface area selection, injection design development, work progress and efficiency evaluation for the EOR method applied.
The operations completed on 5 injectors resulted in around 65 thousand tons of incremental oil from the producers.
The operations were found successful; a new program for injection of polymer solution slugs is currently being developed.
Prediction of the Distribution of Reservoir Rocks of Syrachoy Deposits in the Fields Named After R.Trebs and A.Titova
Authors: Gaymaletdinova Gulnara , Dushin Andrew 
Published: October 2019

Summary
The object of the study is carbonate deposits of the Upper Devonian deposits of the name of the Roman Trebs and the name of Anatoly Titov, which are one of the largest deposits among the explored continental ones in Russia. They are located in the Timan-Pechora oil and gas province, the northeastern part of the Nenets Autonomous District on the territory of the Sadayaginskaya step of the Khoyverhollow.
The purpose of studying the deposits of the Syrachoy horizon is to identify the conditions of the formation of deposits for understanding the structure of the reservoir.
The methodology of the work consists in a detailed study of core material, thin sections, the selection of lithological heterogeneity, their comparison with logging curves, the implementation of intra-layer correlation and comparison with seismic data.
The main result of the work is the construction of a sedimentation model of productive deposits which became the basis for the distribution of reservoir rocks.
Selecting Bridging Agents’ Particle Size Distribution for Optimum Plugging While Drilling in Permeable Zones
Authors: Izyurov V , Kharitonov A , Semenikhin I , Korsunov E , Gassan A , Tikhonov E , Jadan G , Stashko V , Blagonadeshniy I , Manikhin A , Medvedev S 
Published: October 2019

Abstract
Differential sticking problems and drilling fluids losses reducing permeability as a result of deep invasion of drilling and completion fluids are still main challenges. Under the conditions of development of mature fields, these problems become more acute due to the uncompensated drainage of formation fluid from the pay zone. The resolution for one of these problems is a high-quality plugging of permeable formation.
The paper states a wide review of research papers on this topic, laboratory testing of one of the selection methods, an example of technical application of one of the methods, and and prospects for further development of the topic to improve the approaches of practical application.
Digital analysis of shaping ability and topographic changes in M and C wire rotary NiTi systems.
Authors: Aziz Amr Khaled Abd El 
Published: October 2019

Abstract
The primary outcome of this study intends to assess the Shaping ability and surface topographic changes of the 2 rotary Nickel Titanium systems: A) One Curve (Micro Méga, Besançon, France)B) ProTaper Next (Dentsply Maillefer, Ballaigues, Switzerland)What's new in the study is the use of AutoCAD program to assess the shaping ability of both instruments, after using them in a standerdized conditions to evalute the minor differences between the two different alloys used in each instrument.While the secondary outcome of this study is to evaluate the instruments after multiple uses under the SEM to detect any abberrations or deformetiesin the instruments to detect its points of strength and weaknesses.The study is planned for one year and it is not expected to be more than that according to the sample size and the availabilty of the tools needed for the trial.
How knowledge brokering on implementation science can improve implementation outcomes: a case study of a public mental health project
Authors: Hudson Kristian , Lawton Rebecca , Hugh-Jones Siobhan 
Published: October 2019

Abstract
Background Schools need mental health interventions that are deliverable, scalable and effective. However, rates of successful implementation of evidence-based practices in schools is low. An underpinning factor is lack of understanding, and attention, by commissioners, providers and schools, to evidence about what works to bolster effective and sustained implementation. Knowledge brokering is one way to improve use of implementation science for delivery of interventions in complex settings. To date, evidence for the use of knowleldge brokers in public health settings is scarce, and their use for brokering implementation related knowledge is non-existent. The aim of this study was to examine whether it was feasible and acceptable for knowledge about implementation to be brokered to a steering group responsible for a wide scale, public mental health, school-based intervention, and what impact this might have on their implementation decisions.Methods The primary researcher attended 13 monthly steering group meetings during the initial implementation phase of the public mental health program and shared implementation knowledge with them. With consent, meeting notes were taken by the primary researcher, and a journal kept of 12 meetings; 5 meetings were also audio recorded and steering group minutes analysed. All data were amalgamated and ordered into month-by-month summaries. The analysis attempted to identify when implementation knowledge was shared with the group (coded a ‘key moment’) and what the steering group did with this knowledge (coded a ‘key outcome’).Results Over the 13 meetings, 15 key moments led to 14 key outcomes, 10 of which involved implementation decisions being made based on brokered knowledge about implementation science. Discussion The majority of key moments led to a significant number of evidence-informed implementation decisions being made by the steering group. Some brokered knowledge was not acted upon. Implementation knowledge was not shared with the program funders which may have meant they did not appreciate the importance of implementation. Conclusion Knowledge brokering on implementation science to a group responsible for public mental health is feasible and acceptable and a potentially viable implementation strategy for future public health programs.
H 2 O 2 , Ca 2+ , and K + in subsidiary cells of maize leaves are involved in regulatory signaling of stomatal movement
Authors: Zhang Li , Yao Yaqin , Zhang Suiqi 
Published: October 2019

Abstract
Background : The stomata of maize ( Zea mays ) contain a pair of guard cells and a pair of subsidiary cells. To determine whether H 2 O 2 , Ca 2+ , and K + in subsidiary cells were involved in stomatal movement, we treated four-week-old maize (Zhengdan 958) leaves with H 2 O 2 , diphenylene iodonium (DPI), CaCl 2 , and LaCl 3 . Changes in content and distribution of H 2 O 2 , Ca 2+ , and K + during stomatal movement were observed. Results : When exogenous H 2 O 2 was applied, Ca 2+ increased and K + decreased in guard cells, while both ions increased in subsidiary cells, leading to stomatal closure. After DPI treatment, Ca 2+ decreased and K + increased in guard cells, but both Ca 2+ and K + decreased in subsidiary cells, resulting in open stomata. Exogenous CaCl 2 increased H 2 O 2 and reduced K + in guard cells, while significantly increasing them in subsidiary cells and causing stomatal closure. After LaCl 3 treatment, decreased and K + increased in guard cells, whereas both H 2 O 2 and K + decreased in subsidiary cells and stomata became open. Conclusions : These results indicated that H 2 O 2 and Ca 2+ were correlated positively with each other and with K + in subsidiary cells during stomatal movement. Both H 2 O 2 and Ca 2+ in subsidiary cells promote an inflow of K + , indirectly regulating stomatal closure.