Papers by Keyword: Gas

Abstract: The tight oil in the Fuyu oil layer in Sanzhao area of the Songliao Basin has huge resource and reserves, and has a good geological background for tight oil accumulation. It is the main direction of oil and gas exploration in recent years. The conditions and distribution rules of tight oil in Fuyu oil layer in Sanzhao area of Songliao Basin are analyzed by comprehensively using the data of geology, drilling, logging and geochemistry. The results indicate that there’s four favorable conditions for the formation of tight oil in study area: ①The crude oil has great properties and fluidity, and the formation conditions of tight oil are superior; ②The widely distributed high-quality source rock is close to the tight reservoir, that provides sufficient oil basis for the tight oil formation; ③The tight reservoirs distributed widely in a large area provide effective reservoir space for the tight reservoirs formation; ④Formation overpressure is organically matched with oil source faults, which offers sufficient power for tight oil to move downward. Finally, this article points out that the tight oil in Fuyu reservoir of Sanzhao area has the characteristics of large-area continuous distribution, strong heterogeneity, local "dessert" enrichment area, and the river sand body controls the local "dessert" enrichment area of tight oil.

Abstract: Currently, composites with a polymer matrix are most widely used in various industries, including the oil and gas sector, as an alternative to traditional metal materials. The most widespread of non-metallic pipes in the Russian Federation are pipelines made of fiberglass. One of the clear advantages of polymeric materials over metal products is their corrosion resistance. At the same time, upon contact with liquids containing abrasive particles, composites with a polymer matrix can degrade with varying degrees of intensity. Such as type of degradation like hydroabrasive wear of pipelines is common and can lead to equipment failure. Various linings are applied to the inner surface of fiberglass pipes to minimize hydroabrasive wear. This study attempts to assess the durability of coated and uncoated composite polymer materials under conditions of hydroabrasive wear, as well as to compare the properties with other materials currently used in industry.

Abstract: In the trend of unconventional oil and gas explorations, the long laterals over 3,000 m are commonly fractured in multistage fracturing operations. The mill-out of the conventional and temporary isolation downhole tools, such as frac plugs or balls/ball seats, in these wells using mechanical intervention, such as coiled tubing (CT), is a challenge. This paper is to review the developments of the dissolvable alloys to be used on these tools in these long lateral wells to eliminate the mechanical intervention afterward. It includes the history and current status of the developments of the dissolvable alloys. The two types of mainstream dissolvable alloys including magnesium-based and aluminum-based alloys were developed, based on their microscale galvanic corrosion behaviors. The properties of these dissolvable alloys, therefore, depend on the chemistry, process and finally microstructure. The casting and extrusion processes will be discussed since they are very important processes to enhance properties of the dissolvable alloys. The properties including the strength, the ductility and the dissolvability are measured under various temperatures, pressures and salinities conditions. The future trend of development is also briefly visioned.

Abstract: The article deals with the influence of crystallization additives on the life of self-compacting concrete (so-called SCC concrete), which are exposed to chemically aggressive environments. The focus is not only on the effect of the crystallization additive on the characteristics of the capillary-pore structure of SCC concrete, but especially long life durability of self-compacting concrete (two years expozition). The effect of individual types of aggressive environment is assessed on the basis of a set of physico-mechanical and physico-chemical analyzes.

Abstract: This paper investigates the effect of the laser cutting parameters on the heat-affected zone, and on the boundary layer of stainless steel processing. A new analytical resolution based on the boundary layer theory is used to deduce the interaction effects of the cutting parameters on the above zones. The results revealed that, the laminar nitrogen assist gas has a negligible effect on the HAZ depth but it has a remarkable effect on the molten boundary layer. It is also noticed that the pressure gradient remains very small compared to the interface shearing and the conductive heat losses from the cutting zone towards the substrate is dominant compared to the convective heat losses towards the gas.

Abstract: This thesis deals with the testing of our wet scrubber by a laboratory at the Faculty of Chemistry, Brno University of Technology. On this wet scrubber, the CO₂ capture efficiency is tested with a splash liquid consisting of 1 % NaOH. An overview of the system, which could increase the capture efficiency of CO₂ from the gas mixture or other harmful particulates in the air, could be improved after introduction. The thesis also deals with finding methods to better capture efficiency of solid particles and gases on the wet scrubber.

Abstract: The authors of the paper consider the concept of further prospective development of mining enterprises. The basis of this concept are scientific results obtained during the study of physical and chemical processes of solids conversion into the gaseous state: coal → gaseous fuels. It was established that the main base of development of mining regions is a mining power-chemical complex. The basic segment of which is a well underground coal gasification station. It is established that increase of indicators of efficient operation of the station from gasification is possible by synthesis of technical and technological decisions on the use of coal seam energy. When coal gasification is over, the gasifier passes into a mode of thermal generator with the use of alothermal technique to remove heat and thermic decomposition products from the degassed space of the gasifier. Generator gas at its initial temperature (1100 – 1300oС) around an underground gasifier creates a powerful heat boiler with a temperature regime of 200 – 300oС. It was established that at work of six gasifiers on a coal seam with thickness of 1.0 m with geometrical parameters each at a width of 30 m and at the length of 450 m energy-thermal power will be 237.8 MW. At the same time, additional energy resources can be obtained by involving segments of alternative forms of energy supply to the life cycle of the mining enterprise.

Abstract: This research work aimed to study an effect of interpass temperature on a wear resistance of a hard-faced weld metal on JIS-S50C carbon steel surface. The experimental results were found that the increase of the interpass temperature resulted in the increase of the grain size, the decrease of the hardness, and the decrease of wear resistance of the hard-face weld metal. Low interpass temperature affected to increase the residual stress inducing the cracking on the interface between the first weld metal layer and the base metal. Wear surface composed the crater and the groove wear traces that showed the different evidence of the failed off metal particles. The lower wear rate was found at the location where contained high amount of the reinforced elements such as chromium, silicon and manganese. The lowest weight loss of 0.89% could be obtained with an application of the optimum interpass temperature of 150 °C.

Abstract: An optimization of a gas metal arc welding (GMAW) process parameter is currently investigated for producing a dissimilar SS400/SUS304 steels joint because a requirement of a sound joint with higher tensile strength. A gas shielding type is one of the important parameter because it could produce a good arc, protect the weld pool from atmosphere and so on. So, this research work aimed to study an effect of the shielding gas type on the mechanical properties of the dissimilar SS400/SUS304 steels butt joint. A relation between microstructure and the mechanical properties of the butt joint was also investigated and compared. The summarized results are as follows. The optimized shielding gas that produced a maximum tensile stregnth of 550 MPa was 95%Ar+5%N₂. Nitrogen gas that mixed to the shielding gas affected to decrease dendrite size and to increase the hardness and tensile strength of weld metal. Fracture characteristic of the joint produced by N₂ mixed gas showed a larger deformation at the location that was closely the fracture location that implied a ductile behavior. The dissimilar SUS304/SS400 metals joint showed a low hardness base metal, a higher hardness interface and a highest hardness weld metal.

Abstract: The article presents the results of applying environmental mechanics in research of absorber for capturing emissions’ hydrocarbons vapors exhausting from the gas station into the atmosphere air. Often residential human habitants are located within the boundary of the sanitary protection zone (SPZ) of these gas filling stations. The analysis measurement’s and stratification’ modeling results these gas emissions’ in the atmosphere showed that benzene and xylene vapor’s concentration in the atmosphere exceeds the existing sanitary-hygienic norms for these ingredients often. There presented the research results of the proposed aspiration schemes was equipped absorbing device for the capture of gas vapor’ emissions at the gas station in this article. It was obtained the regressions of capture effectiveness for the proposed device by mathematical processing. The research results were implemented for design of pilot industrial set up that was installed and successful tested in one of the gas filling station in Russia. It was showed the reliability of the proposed device for practical commercial use.