scholarly journals Determination of the optimal spacing of water curtain boreholes for underground oil storage from the perspective of percolation theory

2020 ◽  
Vol 97 ◽  
pp. 103246
Author(s):  
Wei Li ◽  
Zhechao Wang ◽  
Liping Qiao ◽  
Huan Liu ◽  
Jinjin Yang
Keyword(s):  
Percolation Theory ◽  
Water Curtain ◽  
Oil Storage ◽  
Optimal Spacing

Reasons for the formation of crack-like defects in 09Г2С heavy plate steel for tank steel structures

2020 ◽  
Vol 10 (5) ◽  
pp. 479-489
Author(s):  
Vitaly М. Goritsky ◽  
◽  
Georgy R. Shneyderov ◽  
Eugeny P. Studenov ◽  
Olga A. Zadubrovskaya ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Defect Formation ◽  
Steel Structures ◽  
Controlled Rolling ◽  
Plate Steel ◽  
Heavy Plate ◽  
Oil Storage ◽  
Magnetic Inspection ◽  
Metal Microstructure

Determination of causes of crack-like defects in the heavy plate steel 09Г2С is a crucial task, the solution of which is aimed at improving the mechanical safety of oil storage steel vertical tanks. In order to determine the causes for the formation of a group of crack-like defects oriented towards rolling, revealed during grinding and magnetic inspection of the tank wall surface near the vertical weld, the analysis of the chemical composition and testing of the mechanical properties of heavy plate steel were carried out, including the determination of the anisotropy of impact toughness in the temperature range from +20 to –75 °С, analysis of metal microstructure in the area of defect formation on transversal sections and rolled surface. Impact bending tests of 09Г2С heavy plate steel after controlled rolling in longitudinal and transverse directions showed no anisotropy of impact toughness, as well as high purity of steel as for sulfur and titanium, which at higher content causes impact toughness anisotropy. The revealed features of metal microstructure near the defects made it possible to conclude that the crack-like defects were formed during the rolling of gas bubbles at the stage of preparing semi-finished rolled products for finishing rolling. One of the possible methods to prevent such defects from getting into finished rolled products is the use of automated systems of visual inspection of rolled products in the manufacturing process.

scholarly journals Water Curtain System Pre-design for Crude Oil Storage URCs: A Numerical Modeling and Genetic Programming Approach

2017 ◽  
Vol 36 (2) ◽  
pp. 813-826 ◽  
Author(s):  
Ebrahim Ghotbi Ravandi ◽  
Reza Rahmannejad ◽  
Saeed Karimi-Nasab ◽  
Amir Sarrafi ◽  
Amir Raoof
Keyword(s):  
Numerical Modeling ◽  
Genetic Programming ◽  
Crude Oil ◽  
Programming Approach ◽  
Water Curtain ◽  
Oil Storage

Determination of optimal spacing between transverse jets in a SCRAMJET engine

2020 ◽  
Vol 96 ◽  
pp. 105520 ◽  
Author(s):  
Vatsalya Sharma ◽  
Vinayak Eswaran ◽  
Debasis Chakraborty
Keyword(s):  
Transverse Jets ◽  
Optimal Spacing ◽  
Scramjet Engine

Determination of the Ovality of Crude Oil Storage Tanks Using Least Squares

2011 ◽  
Vol 367 ◽  
pp. 475-483 ◽  
Author(s):  
R. Irughe Ehigiator ◽  
J.O. Ehiorobo ◽  
Ashraf A. Beshr ◽  
M.O. Ehigiator
Keyword(s):  
Crude Oil ◽  
Least Squares ◽  
Unbiased Estimate ◽  
Circular Cross Section ◽  
Field Measurements ◽  
Storage Tanks ◽  
Linear Measurements ◽  
Oil Storage ◽  
Least Squares Adjustment

In the processing of field measurements, the observations are adjusted using the least squares principle which gives unbiased estimate of the parameter sought together with their accuracies. In this paper, the use of the Least Squares model in the determination of the tank radius, centre point coordinates and ovality are discussed. The circular cross section of the crude oil storage tanks was divided into sixteen monitoring stations at equal intervals around the tank and at an elevation of 2m from the tank base. Total station instrument was then used to carry out angular and linear measurements by method of multiple intersection to reflectors held on the studs. The field measurements were post processed and adjustment of observation carried out by Least Squares adjustment method. The adjusted coordinates together with the computed radius were then used to determine tanks ovality. All data processing and adjustment were carried out with the aid of MATLAB Software for the 2003, 2004 and 2008 measurement epochs.The results of the study revealed an expansion of the tank shell between 2004 and 2008 measurement epoch. The radius of the tank was computed to be 38.187m in 2003 and 2004 and 38.205m in 2008 respectively.

Connectivity Evaluation of Water Curtain System of Underground Oil Storage Caverns

2014 ◽  
Vol 711 ◽  
pp. 566-570
Author(s):  
Wen Sheng Yu ◽  
Yang Ping
Keyword(s):  
Fractured Rock ◽  
Underground Water ◽  
Fractured Rock Mass ◽  
Permeability Characteristics ◽  
Engineering Research ◽  
Water Curtain ◽  
Oil Storage ◽  
Seal Oil ◽  
Water Seal ◽  
Artificial Water

The connectivity of water curtain between holes must be known to ensure water seal effect of artificial water curtain system of the underground oil storage caverns. The permeability characteristics of the fractured rock mass is analysed based on packer test and validity test of the water curtain holes of the China's HuangDao’s national petroleum reserve underground water seal oil engineering, puts forward the connectivity judgment criterion of water curtain holes, and evaluate the connectivity of water curtain system of underground oil storage caverns. This criterion has been used in the connectivity evaluation of water curtain system of the HuangDao’s national petroleum reserve underground water seal oil engineering. Research provides a basis for the dynamic design of water curtain system of underground oil storage caverns, reduce project cost.

scholarly journals Analysis of Microstructure Images Referred to Percolation Theory

2015 ◽  
Vol 15 (1) ◽  
pp. 109-112 ◽  
Author(s):  
W. Trzaskowski ◽  
W. Sobaszek ◽  
D. Myszka ◽  
S. Świłło
Keyword(s):  
Percolation Theory ◽  
Spatial Arrangement ◽  
Polycrystalline Materials ◽  
Practical Implementation ◽  
Material Structure ◽  
Two Phase ◽  
Modern Computer ◽  
Planar Images ◽  
Metallographic Image Analysis

Abstract The paper discusses possible applications of the percolation theory in analysis of the microstructure images of polycrystalline materials. Until now, practical use of this theory in metallographic studies has been an almost unprecedented practice. Observation of structures so intricate with the help of this tool is far from the current field of its application. Due to the complexity of the problem itself, modern computer programmes related with the image processing and analysis have been used. To enable practical implementation of the task previously established, an original software has been created. Based on cluster analysis, it is used for the determination of percolation phenomena in the examined materials. For comparative testing, two two-phase materials composed of phases of the same type (ADI matrix and duplex stainless steel) were chosen. Both materials have an austenitic - ferritic structure. The result of metallographic image analysis using a proprietary PERKOLACJA.EXE computer programme was the determination of the content of individual phases within the examined area and of the number of clusters formed by these phases. The outcome of the study is statistical information, which explains and helps in better understanding of the planar images and real spatial arrangement of the examined material structure. The results obtained are expected to assist future determination of the effect that the internal structure of two-phase materials may have on a relationship between the spatial structure and mechanical properties.

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