scholarly journals Study of corrosion stability of a cement stone in magnesia aggressive environment

Georesursy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 73-78 ◽  
Author(s):  
Farit A. Agzamov ◽  
Almaz N. Makhmutov ◽  
Elvira F. Tokunova
Keyword(s):  
Oil And Gas ◽  
Experimental Studies ◽  
Corrosion Damage ◽  
Cement Stone ◽  
Corrosion Mechanism ◽  
Corrosion Stability ◽  
Factors Affecting ◽  
Aggressive Environment ◽  
Mgcl2 Concentration ◽  
Quantitative Indicators

One of the main tasks in the construction of oil and gas wells is to ensure the high quality of well casing. It is especially difficult to get it in wells, in sections of which there are salt-bearing strata. From the salts, the most dangerous are magnesia salts, which can lead to the destruction of the stone based on portland cement within a few months. The report presents the results of experimental studies on the corrosion of cement stone in aggressive magnesia media.The quantitative indicators reflecting the degree of damage to the stone are taken as the thickness of the damaged layer and the coefficient of stone resistance, characterized by the ratio of the ultimate strength of stone samples for compression or bending stored in an aggressive environment to the strength of control samples at the same time of hardening. In the course of the research, the corrosion resistance of the cement stone to the magnesian corrosive environment was assessed, after 8 weeks in a medium with a constant concentration of MgCl2. In addition, the effect of MgCl2 concentration on the cement stone corrosion mechanism was investigated. The use of the palygorskit additive and the reduction of water cement ratio to reduce the porosity of the cement stone and reduce the rate of corrosion damage are proposed. The kinetics and the main factors affecting the corrosion process are considered, and the x-ray structural analysis of corrosion products and unaffected cement stone is carried out.

scholarly journals MAGNESIA CORROSION OF GROUTING MATERIALS

2020 ◽  
Vol 17 (34) ◽  
pp. 951-961
Author(s):  
Farit A AGZAMOV ◽  
Arman KABDUSHEV ◽  
Elvira TOKUNOVA ◽  
BAUYRZHAN Zh MANAPBAYEV ◽  
Bolat Zh KOZHAGELDI
Keyword(s):  
Portland Cement ◽  
Oil And Gas ◽  
Corrosion Damage ◽  
Cement Stone ◽  
Gas Wells ◽  
Entire Interval ◽  
Mgcl2 Concentration ◽  
Oil And Gas Wells ◽  
Magnesium Salts ◽  
Grouting Materials

The issue of magnesia corrosion of grouting materials in oil and gas wells is very relevant in the construction of oil and gas wells since magnesia salts can lead to the destruction of Portland cement-based cement stone within few months. When fastening powerful intervals of salt deposits represented by magnesium salts, the use of magnesia cements is effective. However, individual layers and interlayers containing dissolved magnesium salts are not individually cemented, but overlap over the entire interval of the open hole with cement Portland cement, which can be destroyed due to magnesia corrosion. The main aim of the paper is to analyze the corrosion of Portland cement stone in aggressive environments of magnesia. As the quantitative indicators characterizing the degree of stone damage, the thickness of the damaged layer and the stone resistance coefficient are taken, characterized by the ratio of the compressive strength or bending strength of stone samples after being in an aggressive environment to the strength of control samples at the same hardening time. The corrosion resistance of cement stone was assessed after 8 weeks in an aggressive magnesia environment. Also, the role of MgCl2 concentration on the mechanism of corrosion damage to cement stone was studied. The use of reducing the water-cement ratio and adding palygorskite clay to reduce the porosity of cement stone and reduce the rate of corrosion damage is proposed. The kinetics and the main factors affecting the corrosion process were considered, an X-ray diffraction analysis of corrosion products and unaffected cement stone was carried out.

Aging Effect on Corrosion Damage Evolution Behavior of Fuse-Head Used for Electric Explosive Device

2012 ◽  
Vol 166-169 ◽  
pp. 1883-1886
Author(s):  
You Hong Zhang ◽  
Qian Zhang ◽  
Xin Long Chang ◽  
Chun Guo Yue ◽  
Shi Ying Zhang ◽  
...  
Keyword(s):  
Damage Evolution ◽  
Failure Modes ◽  
Experimental Studies ◽  
Corrosion Damage ◽  
Aging Effect ◽  
Factors Affecting ◽  
Temperature And Humidity ◽  
Explosive Device ◽  
Effects Of Temperature ◽  
Evolution Behavior

Degradation of mechanical properties of electric explosive device fuse-head was serious in different temperature and humidity environments. The objective of this study was to examine the effects of temperature and humidity aging on the damage evolution behavior of fuse-head used for electric explosive device. In this paper, the experimental studies were presented to appreciate the influence of humidity and temperature on the corrosion damage and firing of electric explosive device. The damage mechanisms and failure modes were determined through nondestructive evaluation. The explosive broken and corrosion damage on lead induced by temperature and humidity aging were the main factors affecting the firing probability. At last, the evolution rule of corrosion damage in the environment of different relative humidity and temperature was discussed.

scholarly journals Review of studies on plugging compositions creation with controlled rheological properties and the ability to restore fluidity for completion, workover and abandonment of oil and gas wells

2021 ◽  
pp. 28-46
Author(s):  
D. S. Klimov ◽  
◽  
S. S. Ostapchuk ◽  
E. S. Zakirov ◽  
◽  
...  
Keyword(s):  
Oil And Gas ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Dynamic Loads ◽  
Cement Stone ◽  
Self Healing ◽  
Gas Wells ◽  
Oil And Gas Wells ◽  
Influence Of Temperature On ◽  
Zonal Isolation

The main purpose of cementing oil and gas wells is zonal isolation of the formations exposed by the wellbore. During the entire life of the well, there should be no uncontrolled hydraulic communication between the developed formations and the surface, regardless of the composition and type of fluid (water, oil or gas). During the operation of the well, in addition to constant static ones, the casing and cement stone also experience various dynamic loads. The article presents an up-to-date review of experimental studies on the modification of grouting compositions and cement composites capable of autonomous selfhealing due to the introduction of various additives and nanomaterials. Such modification technologies significantly increase the tightness and resistance of cement to the effects of dynamic loads, the integrity of the cement stone. As a replacement for traditional cement materials, the authors propose the creation of grouting compositions with controlled physical and mechanical properties and the possibility of their re-liquefaction under the influence of temperature on the basis of bitumen or bitumen composites. Keywords: well plugging and abandoning; self-healing materials; autonomous self-healing; casing durability; impermeability of the cement stone; self-healing cement; bitumen and bitumen composites.

scholarly journals Study of Concrete under Combined Action of Aggressive Environment and Long-Term Loading

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6612
Author(s):  
Yaroslav Blikharskyy ◽  
Jacek Selejdak ◽  
Nadiia Kopiika ◽  
Rostyslav Vashkevych
Keyword(s):  
Reinforced Concrete ◽  
Concrete Strength ◽  
Aggressive Medium ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Corrosion Damage ◽  
Simultaneous Action ◽  
Reinforced Concrete Structures ◽  
Cross Sectional ◽  
Aggressive Environment

A significant part of reinforced concrete structures is subjected to intensive environmental impact during operation. This can cause local destruction and failure of buildings if obligatory measures are not taken to protect them from corrosion. This is especially true for industrial buildings, where the environment could be contaminated with aggressive products or waste. An important issue is the development of methods for calculating the load-bearing capacity and serviceability of reinforced concrete structures with corrosion damage. The main reason for this is the necessity to determine the durability and reliability of buildings and structures and the estimation of their safe operation time. As corrosion damages of concrete are a critical issue, more detailed experimental studies are needed. This paper presents experimental studies of concrete prisms under the simultaneous action of an aggressive environment and a constant level of compressive force. In total, 32 prisms under different loading conditions and in different aggressive medium were tested. Samples were divided in series, for which different load levels were chosen (0.25fck, 0.35fck, 0.45fck). Additionally, control samples in the air and immersed in water were tested. During the experiment, different parameters were monitored and recorded: decrease of cross-sectional size, the temperature and environmental humidity. Results of the study showed that destruction occurred due to the presence of corrosion damages of concrete and a reduction of the cross-sectional area. The stresses in the concrete at the destruction stage were less than the value of the prism strength by 10–12%. It was established that along the contour of the section, there is a partially degraded layer of concrete of 1.5–3.7 mm thickness, with corrosion microcracks and corrosion products. Additionally, experimental and theoretical diagrams of concrete with corrosion damages were obtained and compared. The ultimate deformations of concrete with corrosion damage, which correspond to the prismatic strength of concrete, in comparison with undamaged concrete were lower by 11–18%. Therefore, the concrete strength is decreased during exploitation under loading in an aggressive environment, which needs to be taken into account during calculations.

DIESEL ENGINE OPERATION IN USE OF FUEL WITH ADDITIVES

2018 ◽  
pp. 18-24
Author(s):  
Petar Kazakov ◽  
Atanas Iliev ◽  
Emil Marinov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Combustion Engines ◽  
Engine Operation ◽  
Factors Affecting ◽  
Operating Modes ◽  
Positive Effects

Over the decades, more attention has been paid to emissions from the means of transport and the use of different fuels and combustion fuels for the operation of internal combustion engines than on fuel consumption. This, in turn, enables research into products that are said to reduce fuel consumption. The report summarizes four studies of fuel-related innovation products. The studies covered by this report are conducted with diesel fuel and usually contain diesel fuel and three additives for it. Manufacturers of additives are based on already existing studies showing a 10-30% reduction in fuel consumption. Comparative experimental studies related to the use of commercially available diesel fuel with and without the use of additives have been performed in laboratory conditions. The studies were carried out on a stationary diesel engine СМД-17КН equipped with brake КИ1368В. Repeated results were recorded, but they did not confirm the significant positive effect of additives on specific fuel consumption. In some cases, the factors affecting errors in this type of research on the effectiveness of fuel additives for commercial purposes are considered. The reasons for the positive effects of such use of additives in certain engine operating modes are also clarified.

ADOLESCENTS IN CRIMINAL STREET GROUPINGS: REASONS AND MOTIVATIONS

2019 ◽  
Vol 29 (2) ◽  
pp. 195-199
Author(s):  
E.O. Chernova
Keyword(s):  
At Risk ◽  
Preventive Measures ◽  
Experimental Studies ◽  
Motivational Factors ◽  
Social Motives ◽  
Factors Affecting ◽  
Social Communities ◽  
Criminal Groups

The article gives an analysis of the results of authorial experimental studies. Motivational factors affecting adolescents' participation in criminal groups are considered, they are: dominant groups of motives, the predominance of aspiration to success or avoidance of failures. Thus, the author explores the subjective potential of the personality of adolescent groupers. According to the results of the research, the author concludes that the specificity of the motivation of such adolescents consists in the predominance of material motives, social motives (involvement in social communities, groupings) and motives of recognition and respect. The author notes that the motivation for avoiding failures is more characteristic of such adolescents than the motivation for the pursuit of success. It is concluded that the data obtained can serve as a basis for developing preventive measures when working with adolescents at risk.

The methodology of experimental research of the feed components extrusion process in order to improve its energy performance

2020 ◽  
pp. 147-152
Author(s):  
E. M. Ratnikov ◽  
D. O. Milko
Keyword(s):  
Experimental Studies ◽  
Energy Performance ◽  
Extrusion Process ◽  
Mathematical Methods ◽  
Screw Extruder ◽  
Mathematical Planning ◽  
Factors Affecting ◽  
Extrusion Processing ◽  
Definition Of

Annotation Purpose. Development of a program and methods for conducting experimental studies of the extrusion process with the definition of parameters and modes of operation of the extruder to improve its energy performance. Methods. Methods of mathematical statistics, synthesis, analysis, description and modeling were used. Results. The application of mathematical methods, in particular mathematical planning, reduces the number of experiments several times, and allows to evaluate the role of influencing factors, obtain a mathematical model of the process and determine the optimal conditions for its parameters and modes, etc. Conclusions. The methodology for experimental studies of a screw extruder is presented with the necessary equipment and methodology for processing the obtained experimental data. A mathematical method of planning, which reduces the number of experiments several times, allows us to evaluate the role of factors affecting productivity and energy intensity is presented. Keywords: extruder, auger, nutrients, research methodology, extrusion, processing, feed.

Combined Corrosion and Fatigue Degradation of Nitinol Implants

2013 ◽  
Vol 712-715 ◽  
pp. 474-477
Author(s):  
Stepan Major ◽  
Stepan Hubalovsky ◽  
Josef Šedivý
Keyword(s):  
Stent Graft ◽  
Graft Failure ◽  
Chemical Etching ◽  
Surface Preparation ◽  
Corrosive Environment ◽  
Stent Grafts ◽  
Corrosion Stability ◽  
Aggressive Environment ◽  
Wide Range ◽  
Significant Application

Nitinol is metal alloy of nickel and titanium. It has wide range of applications. The most significant application is production of self-expanding stent-grafts, which are commonly used in vascular surgery. Stent-graft manufactures are confronted with two basic requirements: stents must have an infinite life; stents must be made of the thinnest wires us possible. Stent-graft failure or device fatigue remains major concern for stent-graft manufactures and researches. The stent-grafts are mechanically loaded, and also the device is placed in very aggressive environment. The corrosion stability of Nitinol is strongly dependent on the surface preparation: grinding, polishing, chemical etching. The paper deals with fatigue degradation of stent-grafts in corrosive environment.

Strengthening Low Carbon Steels for Oil and Gas Spiral Welded Pipes

2006 ◽  
Author(s):  
I. Yu. Pyshmintsev ◽  
D. A. Pumpyanskyi ◽  
Yu. O. Kamenskih ◽  
I. N. Poznyakovsky ◽  
I. L. Permyakov
Keyword(s):  
Oil And Gas ◽  
Controlled Rolling ◽  
Carbon Steels ◽  
Low Carbon ◽  
Line Pipe ◽  
Low Carbon Steels ◽  
Factors Affecting ◽  
Steel Processing ◽  
Line Pipe Steel ◽  
Strain Hardening Behavior

Strengthening mechanisms applied for modern line pipe steel design were studied. Low carbon steels alloyed with Mn, Mo, V, Nb processed by the way of controlled rolling were developed for spiral welded X65-X80 line pipes up to 1420 mm diameter. Formation of the microstructure during steel processing was studied. The effects of typical microstructure for the steels on mechanical properties, strain hardening behavior and Bauschinger effect were studied. Main metallurgical factors affecting on strength measured in plates and pipes were revealed using physical and computer simulations.

Applications of Nanomaterials in Wellbore Fluids in Oil and Gas Fields

2021 ◽  
Vol 881 ◽  
pp. 33-37
Author(s):  
Wei Na Di
Keyword(s):  
Oil And Gas ◽  
Drill String ◽  
Wellbore Stability ◽  
Petroleum Engineering ◽  
Cement Stone ◽  
Drilling Fluids ◽  
Cement Slurry ◽  
Oil And Gas Fields ◽  
Gas Channeling ◽  
Gas Fields

The application of nanomaterials in oil and gas fields development has solved many problems and pushed forward the development of petroleum engineering technology. Nanomaterials have also been used in wellbore fluids. Nanomaterials with special properties can play an important role in improving the strength and flexibility of mud cake, reducing friction between the drill string and wellbore and maintaining wellbore stability. Adding nanomaterials into the cement slurry can eliminate gas channeling through excellent zonal isolation and improve the cementing strength of cement stone, thereby facilitating the protection and discovery of reservoirs and enhancing the oil and gas recovery. This paper tracks the application progress of nanomaterials in wellbore fluids in oil and gas fields in recent years, including drilling fluids, cement slurries. Through the tracking and analysis of this paper, it is concluded that the applications of nanomaterials in wellbore fluids in oil and gas fields show a huge potential and can improve the performance of wellbore fluids.

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