scholarly journals SENSITIZATION STUDY IN FRICTION STIR WELDS OF INCONEL® 625

2018 ◽  
Vol 15 (29) ◽  
pp. 56-63
Author(s):  
D. MARTINAZZI ◽  
G. V. B. LEMOS ◽  
H. R. P. CARDOSO ◽  
R. E. DOS SANTOS ◽  
J. Z. FERREIRA ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Inconel 625 ◽  
Isothermal Treatment ◽  
Gas Industry ◽  
Electrochemical Tests ◽  
Friction Stir ◽  
Before And After ◽  
Degree Of Sensitization

The new challenges of the oil and gas industry require noble materials with chemical stability and greater mechanical properties. Alloy 625, popularly known as Inconel® 625, is used as a cladding material for pipelines and other components. Therefore, the study of joining methods that produce excellent welded joints is essential. Thus, in this study, welded sheets of Inconel 625 were produced by Friction Stir Welding (FSW) and afterwards they were subjected to a heat treatment to evaluate the susceptibility to sensitization by the Double Loop Electrochemical Potentiokinetic Reactivation(DL-EPR)technique. In addition, microhardness profiles were performed before and after the isothermal treatment. The microhardness results indicated that the increased hardness is due to the carbides formation after heat treatment. On the other hand, electrochemical tests showed that FSW process can significantly affect the degree of sensitization.

Development of Heat Treatment Mode with Quenching in Different Quenching Environments for the Casing Pipe in Order to Obtain the Required Mechanical Properties

2020 ◽  
Vol 836 ◽  
pp. 41-45
Author(s):  
S.N. Dzhabbarov ◽  
E.I. Pryakhin
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Characteristics ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Treatment Mode ◽  
Gas Industry ◽  
Heat Treatment Mode ◽  
Optimal Technology ◽  
Casing Pipe

Development of an optimal technology of heat treatment for blanks of the casing pipe made of steel 40H (GOST 4543) is used in the oil and gas industry for casing. It is accompanied by quenching in various environments to ensure guaranteed obtainment of the required mechanical characteristics. These characteristics are specified in GOST 632-80 and met in order to improve the properties of the 40H steel.

scholarly journals Financial Performance Analysis Before and After the Decline in Oil Production: Case Study in Indonesian Oil and Gas Industry

2018 ◽  
Vol 7 (3.21) ◽  
pp. 10
Author(s):  
Wiwiek Mardawiyah Daryanto ◽  
Dety Nurfadilah
Keyword(s):  
Financial Performance ◽  
Oil And Gas ◽  
Oil Production ◽  
Oil And Gas Industry ◽  
Gas Production ◽  
Gas Industry ◽  
Oil And Gas Production ◽  
Return On Equity ◽  
Financial Condition ◽  
Before And After

Indonesia’s oil and gas industry is the huge contributor to government export revenues and foreign exchange and contributes a substantial amount to state revenue. However, the total of oil production declined around 4,41% per year since 2007, and the sharpest decline was in 2013. This situation gives impact to the performance of oil and gas industry, especially government revenues. Therefore, the purpose of this study is to measure the financial performance of Oil and Gas Industry and to examine the significance differences between the financial performance before and after the decline in oil and gas production. The data were collected from financial report and the period was divided into two periods, before the decline in production (2011 – 2012) and after the decline in production (2014 – 2015). Paired sample t-test and financial ratio analysis (FRA) were used to analyzed the data. The finding shows that the largest oil and gas company in Indonesia is still in good financial condition, although it gained loss. In addition, current ratio and return on equity had significance difference during the period of before and after a decline in oil and gas production. The authors believe that the findings will be helpful for managers who continuously attempt to explore opportunities to provide a higher return. 

Quality Control of Composite Material Pipes by Infrared Thermography

2012 ◽  
Vol 188 ◽  
pp. 140-143 ◽  
Author(s):  
Alexandrina Mihai ◽  
Florin Ştefănescu ◽  
Gigel Neagu ◽  
C.P. Mihai
Keyword(s):  
Infrared Thermography ◽  
Oil And Gas ◽  
High Reliability ◽  
Stress Test ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Before And After ◽  
Reference Images ◽  
Composite Pipes ◽  
The Impact

The paper presents some aspects concerning the use of infrared thermography (IRT) in the evaluation of composite pipes integrity. Composite pipelines made up of glass fibres reinforced epoxy resins are increasingly used, especially in oil and gas industry, for their good mechanical properties, combined with reduced weight and excellent behaviour under hostile environment conditions. Taking into account that high reliability is required for such pipe networks, it is mandatory to choose reliable non-destructive inspection (NDI) methods to achieve efficient structural health monitoring. The main advantages of the IRT inspection are: non-contact and non-dangerous examination. In order to characterize the integrity of composites pipes, first of all the researches were interested in obtaining a set of reference images and then to examine the samples before and after the impact stress test. The conclusions point out the schemes and the optimal parameters of evaluation as well as the application limits of thermographic inspection

scholarly journals THE USE OF X-RAY MICROTOMOGRAPHY TO ASSESS CHANGES IN THE VOIDS STRUCTURE OF ROCKS

2017 ◽  
Vol 26 (26) ◽  
pp. 12-16
Author(s):  
Andrei Aleksandrovich PONOMAREV ◽  
Aleksandra Vladimirovna BUBNOVA ◽  
Marcos Antônio KLUNK
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
High Tech ◽  
Cylindrical Shape ◽  
Void Space ◽  
Gas Generation ◽  
Gas Industry ◽  
X Ray ◽  
Before And After ◽  
Oil Source

The oil and gas industry is developing rapidly. Based on this, it is necessary to determine new methods of productive prospecting of mineral deposits. One of the most high-tech and perspective methods is computer X-ray microtomography. For this stage, this method is widely used for the different fields of geology and geophysics. The main advantage is the ability to study the sample without destruction, which is especially important in the process of working with the kern material. In this paper, the method of computerized X-ray microtomography is highlighted. A comparative analysis of the voids structure of an oil source rock before and after exposure to microwave fields using the standard DataViewer software is clarified. As a result of this analysis, an increase in the diameter of a sample of a cylindrical shape after treatment with microwave fields was established, and the formation of microcracks was also established. Based on the results obtained, assumptions were made about the formation of hydrocarbon deposits. In other words, the paper discusses in detail the method that allows fixing changes in the structure of the void space of rocks as a result of oil and gas generation flowing under the influence of wave fields.

Friction stir welding of steels for the oil and gas industry

2013 ◽  
pp. 75-79 ◽  
Author(s):  
A.J. Ramirez ◽  
T.F.C. Hermenegildo ◽  
V.F. Pereira ◽  
J.A. Avila ◽  
T.F.A. Santos ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Friction Stir

Thermodynamic Analysis of the Effect of Compositional Inhomogeneity on Phase Transformations in a 13Cr6Ni2Mo Supermartensitic Stainless Steel

2011 ◽  
Vol 172-174 ◽  
pp. 899-904 ◽  
Author(s):  
Andrea Bojack ◽  
Lie Zhao ◽  
Jilt Sietsma
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Phase Transformations ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Supermartensitic Stainless Steel ◽  
Compositional Variations ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Supermartensitic stainless steels possess an excellent combination of strength, toughness and corrosion resistance and have attracted an increased industrial attention especially from the offshore oil and gas industry, where those materials are already successfully in use. It is well known that the mechanical properties of this type of steels are strongly dependent on the fraction of retained austenite, which is controlled by heat treatment. Because the products manufactured out of these steels are in large sections, temperature gradients and corresponding compositional inhomogeneities are inevitable. Also during heat treatment partitioning of elements between the phases will give local concentrations far removed from the bulk levels. In the present work a 13Cr6Ni2Mo supermartensitic stainless steel is thermodynamically analyzed using the Thermo-Calc®software package where the influence of compositional variations on phase transformations is investigated, in particular the effect of changes in the Ae3-temperature is discussed.

The Centaur Engine: Operational Progress Report

1978 ◽  
Author(s):  
C. W. Emmerson
Keyword(s):  
Oil And Gas ◽  
Operating Experience ◽  
Oil And Gas Industry ◽  
Working Environment ◽  
Test Program ◽  
Gas Industry ◽  
Basic Model ◽  
Before And After ◽  
Qualification Testing ◽  
Made In

The Centaur engine, introduced by Solar in 1970, pioneered the application of turbine power in the 3000- to 4000-hp class for the oil and gas industry. Today, with over 500 units operating in some of the toughest industrial environments in the world, the documented reliability of the basic model continues to improve, surpassing original life objectives. Many changes have been made to the Centaur engine since 1970. This paper deals specifically with those based on field operating experience. Each modification is described in terms of the field experience, both before and after the change, the in-house and/or field test program, and the qualification testing involved. The scope of the discussion includes modifications applied throughout the major components of the engine. Of particular interest are the changes incorporated due to operation in arctic environments. Other modifications were made in response to specific problems encountered in unusual or particularly abusive service. The overall effect has been to greatly strengthen the engine improving both durability and reliability in the industrial working environment it serves.

scholarly journals Investigation of Pre- and Post-Swelling Behavior of Elastomeric Material

2013 ◽  
Vol 10 (1) ◽  
pp. 65 ◽  
Author(s):  
M Akhtar ◽  
Md Velden ◽  
SSA Al-Houqani
Keyword(s):  
Bulk Modulus ◽  
Oil And Gas ◽  
Saline Water ◽  
Volumetric Strain ◽  
Oil And Gas Industry ◽  
Material Behavior ◽  
Gas Industry ◽  
Elastomeric Material ◽  
Before And After ◽  
Tension And Compression

In the last ten years, a new type of modern polymer, known as swelling elastomer, has been used extensively as a sealing element in the oil and gas industry. These elastomers have been instrumental in various new applications such as water shut off, zonal isolation, and sidetracking. Though swell packers can significantly reduce costs and increase productivity, their failure can lead to serious losses. The integrity and reliability of swelling elastomer seals under different field conditions is a major concern. The investigation of changes in material behavior over a specified swelling period is a necessary first step for performance evaluation of elastomer seals. The current study is based on experimental analysis of changes in geometric and mechanical behavior (hardness, tensile, compressive, bulk) of an elastomeric material due to swelling. Tests were carried out before and after various stages of swelling. Specimens were placed in saline water (0.6% and 12% concentrations) at a temperature of 50°C, with the total swelling period being one month. Swelling, hardness, compression, and bulk tests were conducted using disc samples, while ring samples were used for tensile experiments. A small test rig was designed and constructed for determination of bulk modulus. Stress-strain curves under tension and compression, and pressure volumetric-strain curves were obtained for specimens subjected to different swelling periods. Due to the fast-swell nature of the elastomer, there were sharp changes in mechanical properties within the first few days of swelling for both salinities. Elastic modulus derived from tensile and compressive tests showed a 90% decrease in the first few days. Bulk modulus showed fluctuation in its variation with an increasing swelling period. There was a small effect of salinity only during the first 5 or 6 days. 

scholarly journals A Financial Ratio Analysis of Oil and Gas Private Company in Indonesia: Before and After Declining the Oil Production

2018 ◽  
Vol 2 (2) ◽  
pp. 74-83
Author(s):  
Wiwiek Mardawiyah Daryanto ◽  
Sudarmawan Samidi
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Production ◽  
Ratio Analysis ◽  
Private Company ◽  
Gas Industry ◽  
Oil And Gas Production ◽  
Financial Ratio ◽  
Financial Ratio Analysis ◽  
Before And After

As we know that the oil and gas industry is a huge industry and a big contributor to government revenue. However, a signiicant decline in government revenues from this sector is in 2014 by 14.11% to 4.46% in 2015, and in 2016 the value is not too far from the previous year that is 4.58%. This is due to the decline in world oil prices and also the decline in production of Indonesian private oil and gas companies. The purpose of this study is to analyze the financial performance of Indonesia’s private oil and gas company before and after declining the national oil and gas production. The data were collected from financial report of PT. Medco Internasional, Tbk and divided into two periods. The period before the decline in production from 2011 to 2013, and after the decline in production from 2014 to 2016. Financial ratio analysis (FRA) and paired sample t-test were used to analyze the data. The results show that Indonesia’s private oil and gas company is still in good performance even in one year suffered considerable losses. The value of cash ratio, inventory turnover, and collection period signiicantly different before and after the decline in oil and gas production. The authors believe that findings will be helpful for managers who continuously attempt to explore opportunities to provide a higher return.

Effects of Applying a Stochastic Rebound Model in Erosion Prediction of Elbow and Plugged Tee

2002 ◽  
Author(s):  
Xianghui Chen ◽  
Brenton S. McLaury ◽  
Siamack A. Shirazi
Keyword(s):  
Prediction Model ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Outer Wall ◽  
Stochastic Approach ◽  
Solid Particles ◽  
Gas Industry ◽  
Erosion Prediction ◽  
Before And After ◽  
Experimental Findings

Solid particle erosion is a complex phenomenon that depends on many factors such as particle and fluid characteristics, type of material being eroded, and flow geometry. Fittings used in the oil and gas industry such as elbows are susceptible to erosion when solid particles are present in the flow. The momentum of particles carries them across streamlines and the particles impinge the outer wall of the elbow resulting in erosion damage. In an erosive environment, plugged tees are commonly used instead of elbows to reduce the erosion especially where space considerations are important and long-radius elbows can not be used. However, it is unclear how much of a reduction in erosion occurs by replacing an elbow with a plugged tee. In order to compare the erosion in an elbow and a plugged tee exposed to the same flow conditions, a CFD-based erosion prediction model is applied. The model has three primary steps: flow modeling, particle tracking, and applying erosion equations. The results from the model agree with experimental findings for the elbow geometry. However, the simulation results for erosion rate generated for the plugged tee requires a stochastic approach. Results obtained with the erosion prediction model before and after this modification are shown.

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