scholarly journals Dynamic effect analysis of the coiled tubing-in-riser system considering the operation and environmental parameters

2020 ◽  
Vol 210 ◽  
pp. 107189
Author(s):  
Wenming Wang ◽  
Yi Hao ◽  
Zhenyu Wu ◽  
Jinchao Fan ◽  
Liyun Lao ◽  
...  
Keyword(s):  
Dynamic Effect ◽  
Environmental Parameters ◽  
Effect Analysis ◽  
Coiled Tubing

scholarly journals Environmental risk assessment of low density polyethylene unit using the method of failure mode and effect analysis

2012 ◽  
Vol 18 (1) ◽  
pp. 103-113 ◽  
Author(s):  
Parinaz Salati ◽  
Seyed Jozi
Keyword(s):  
Risk Assessment ◽  
Failure Mode ◽  
Environmental Risk ◽  
Environmental Risk Assessment ◽  
Environmental Parameters ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Risk Priority Number ◽  
Environmental Aspects ◽  
Effect Analysis

The ninth olefin plan of Arya Sasol Petrochemical Company (A.S.P.C.) is regarded the largest gas Olefin Unit located on Pars Special Economic Energy Zone (P.S.E.E.Z). Considering the importance of the petrochemical unit, its environmental assessment seems necessary to identify and reduce potential hazards. For this purpose, after determining the scope of the study area, identification and measurement of the environmental parameters, environmental risk assessment of the unit was carried out using Environment Failure Mode and Effect Analysis (EFMEA). Using the noted method, sources causing environmental risks were identified, rated and prioritized. Beside, the impacts of the environmental aspects derived from the unit activities as well as their consequences were also analyzed. Furthermore, the identified impacts were prioritized based on Risk Priority Number (RPN) and severity level of the consequences imposed on the affected environment. After performing statistical calculations, it was found that the environmental aspects owing the risk priority number higher than 15 have a high level of risk. Results obtained from Low Density Polyethylene Unit revealed that the highest risk belongs to the emergency vent system with risk priority number equal to 48. It is occurred due to imperfect performance of the reactor safety system leading to the emissions of ethylene gas, particles, and radioactive steam as well as air and noise pollutions. Results derived from secondary assessment of the environmental aspects, through difference in calculated RPN and activities risk levels showed that employing modern methods and risk assessment are have remarkably reduced the severity of risk and consequently detracted the damages and losses incurred on the environment.

The Dynamic Effect Analysis of Transient Unloading due to Blasting Excavation in Deep and Hard Rock Roadway

2013 ◽  
Vol 753-755 ◽  
pp. 682-685 ◽  
Author(s):  
Jun Guo ◽  
De Qing Gan ◽  
Jing Tan ◽  
Gui Lin Lv
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hard Rock ◽  
Dynamic Effect ◽  
Rock Fragmentation ◽  
Effect Analysis ◽  
Dynamic Finite Element ◽  
Blasting Excavation ◽  
Rock Roadway ◽  
Element Method

The dynamic effect analysis of transient unloading is one of main points to the mechanism of rock fragmentation by blasting. The paper introduces the details of rhe effect of instantaneous unloading to rock fragmentation by blasting. Use the dynamic finite element method to calculate the process of transient unloading of excavation; get some conclusions about transient unloading.

Oil Field Downhole Drone

2021 ◽  
Author(s):  
Mohammed Al Dabbous ◽  
Mohammad Al-Kadem
Keyword(s):  
Data Storage ◽  
Industrial Revolution ◽  
Mechanical Energy ◽  
Environmental Parameters ◽  
Positive Influence ◽  
Propulsion System ◽  
Oil Field ◽  
Well Production ◽  
Coiled Tubing ◽  
Productive Zone

Abstract The downhole drone is directed toward an autonomous Oil & Gas (O&G) utilization of a drone in subsurface wells. The autonomous submersible O&G drone comprises a circular shaped housing, a propulsion system with one or more spinner blades located at the front and rear sides driven by electromotors that can pivot along the axis of drone for locomotion determination and a control package unit: wireless transponder, power, control and data storage and sensors. Existing technologies for surveying, such as production logging conveyed into the wellbore by coiled tubing limits wellbore access due to factors such as the length and size of wellbore, the trajectory/inclination. These factors, and in situ environmental parameters, may limit and restrict access surveying the entire wellbore via existing technologies. This adaptable for wellbore surveillance and logging includes: body, circular structure for stabilization, rechargeable spinners, digital temperature and pressure, gradiometer, gyroscope and wireless communication package. The drone is dropped into the well from the surface under shut in conditions and falls by gravity into the lowest section of the hole. The implementation associates with minimization of man-hours with cost avoidance. The concept has a positive influence on the environment since personnel will be less exposed to hydrocarbons, especially hazardous gases such as Hydrogen Sulfide and Carbon Dioxide. The autonomous, remotely guided downhole drone surveys a predetermined area in the downhole well environment to collect well production data in terms of fluid entry/exit from the well bore, velocity as the well is in production or shut in conditions. Data such as: flow rate, temperature & pressure profiling and leak deduction. The drone moves into the production section of the well by its own propulsion as directed by the surface control system. At selected locations, it stops and takes measurements by rotating two propulsion spinners that are rechargeable; converting mechanical energy into electrical. Pressure, temperature and gradiometer information is collected continuously as the drone is propelled through the productive zone as well as when stationary. Upon completion of required data collection through the productive zone, the vehicle is simply lifted out of the hole by the flow of the well assisted by the propulsion system as required. The future of fourth Industrial Revolution (IR 4.0) was paved commencing from the pioneering realization of the value of well intervention. This invention has a magnificent contribution in cost saving, conveyance methodologies improvement, personnel safety, energy conservation, downhole visualization and perpetuating the investment in the human capital.

Observation of the Sulphur Atoms in Cu2S Using HREM

1990 ◽  
Vol 48 (1) ◽  
pp. 38-39
Author(s):  
Y.D. Yu ◽  
R. Guan ◽  
K.H. Kuo ◽  
H. Hashimoto
Keyword(s):  
Electron Diffraction ◽  
Tube Wall ◽  
Present Report ◽  
Dynamic Effect ◽  
Glass Tube ◽  
Fluorite Structure ◽  
Point Of View ◽  
Electron Diffraction Analysis ◽  
Sulphur Atom ◽  
Copper Thin Film

We have indicated that the lighter atoms such as oxygen in Cu2O can be observed at the specimen with optimal thicknesses based on the dynamic effect of electron diffraction(1). This rule in principle should hold good for the imaging of other lighter atoms such as sulphur atom in Cu2S. However, this point of view needs further experimentally confirm because up to now only oxygen atoms have been observed in Cu2O and a series of new suboxides of copper and nickel (2). In addition, the sulphur atom is much heavier than oxygen one though is still lighter than copper atom. In the present report we provide such a confirmation.The crystallites of Cu2S shown in Fig.l were obtained by sulfurizing at 300°C of the copper thin film which was sealed in a glass tube with mg sulphur left on the tube wall in a vacuum of about 10-2 Pa. The energy dispersive spectrocscopy analysis indicated that they are the sulfides and the electron diffraction analysis indicated they have anti-fluorite structure.

HUBUNGAN KEPADATAN BIVALVIA DENGAN PARAMETER LINGKUNGAN DI PESISIR TANJUNG PURA KABUPATEN BANGKA TENGAH

2020 ◽  
Vol 13 (2) ◽  
pp. 112-121
Author(s):  
Sudiyar . ◽  
Okto Supratman ◽  
Indra Ambalika Syari
Keyword(s):  
Negative Impact ◽  
Principal Component ◽  
Environmental Parameters ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Random System ◽  
System Method ◽  
Relationship Of ◽  
The Relationship ◽  
Anadara Granosa

The destructive fishing feared will give a negative impact on the survival of this organism. This study aims to analyze the density of bivalves, distribution patterns, and to analyze the relationship of bivalves with environmental parameters in Tanjung Pura village. This research was conducted in March 2019. The systematic random system method was used for collecting data of bivalves. The collecting Data retrieval divided into five research stasions. The results obtained 6 types of bivalves from 3 families and the total is 115 individuals. The highest bivalve density is 4.56 ind / m², and the lowest bivalves are located at station 2,1.56 ind / m²,  The pattern of bivalve distribution in the Coastal of Tanjung Pura Village is grouping. The results of principal component analysis (PCA) showed that Anadara granosa species was positively correlated with TSS r = 0.890, Dosinia contusa, Anomalocardia squamosa, Mererix meretrix, Placamen isabellina, and Tellinella spengleri were positively correlated with currents r = 0.933.

Recirculation versus flow-through rainbow trout laboratory Flavobacterium columnare challenge

2020 ◽  
Vol 139 ◽  
pp. 213-221
Author(s):  
C Birkett ◽  
R Lipscomb ◽  
T Moreland ◽  
T Leeds ◽  
JP Evenhuis
Keyword(s):  
Rainbow Trout ◽  
Environmental Parameters ◽  
Cumulative Effects ◽  
Flavobacterium Columnare ◽  
Replacement Rate ◽  
Bacterial Concentration ◽  
Water Replacement ◽  
Dose Concentration ◽  
Flow Through ◽  
And Control

Flavobacterium columnare immersion challenges are affected by water-related environmental parameters and thus are difficult to reproduce. Whereas these challenges are typically conducted using flow-through systems, use of a recirculating challenge system to control environmental parameters may improve reproducibility. We compared mortality, bacterial concentration, and environmental parameters between flow-through and recirculating immersion challenge systems under laboratory conditions using 20 rainbow trout families. Despite identical dose concentration (1:75 dilution), duration of challenge, lot of fish, and temperature, average mortality in the recirculating system (42%) was lower (p < 0.01) compared to the flow-through system (77%), and there was low correlation (r = 0.24) of family mortality. Mean days to death (3.25 vs. 2.99 d) and aquaria-to-aquaria variation (9.6 vs. 10.4%) in the recirculating and flow-through systems, respectively, did not differ (p ≥ 0.30). Despite 10-fold lower water replacement rate in the recirculating (0.4 exchanges h-1) compared to flow-through system (4 exchanges h-1), differences in bacterial concentration between the 2 systems were modest (≤0.6 orders of magnitude) and inconsistent throughout the 21 d challenge. Compared to the flow-through system, dissolved oxygen during the 1 h exposure and pH were greater (p ≤ 0.02), and calcium and hardness were lower (p ≤ 0.03), in the recirculating system. Although this study was not designed to test effects of specific environmental parameters on mortality, it demonstrates that the cumulative effects of these parameters result in poor reproducibility. A recirculating immersion challenge model may be warranted to empirically identify and control environmental parameters affecting mortality and thus may serve as a more repeatable laboratory challenge model.

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