Innovative approaches to light-alloy drill pipes modification for drilling in abnormal operating conditions

2019 ◽  
pp. 860-863
Author(s):  
M.N. Nazarova ◽  
A.I. Shakirova ◽  
R.A. Ismakov ◽  
A.Kh. Agliullin ◽  
N.K. Tsenev
Keyword(s):  
Operating Conditions ◽  
Light Alloy ◽  
Drill Pipes ◽  
Abnormal Operating Conditions ◽  
Innovative Approaches

scholarly journals Protection enhancing of threaded connections of light-alloy drill pipes against contact corrosion

2021 ◽  
Vol 225 ◽  
pp. 03003
Author(s):  
Vladimir Malyshev ◽  
Mikhail Gelfgat ◽  
Arseniy Scherbakov ◽  
Alexey Alkhimenko
Keyword(s):  
Ceramic Coatings ◽  
Electrochemical Process ◽  
Operating Conditions ◽  
Light Alloy ◽  
Steel Tool ◽  
Contact Corrosion ◽  
Threaded Connection ◽  
Drill Pipes ◽  
Aluminum Pipe ◽  
Tool Joint

When using light-alloy drill pipes (LAIDP) with steel tool joints, the development of contact corrosion is observed under certain operating conditions. The value of corrosion mainly depends on the difference in electrochemical potential (ECP) of the contacting metals. One of the effective methods for increasing the corrosion resistance of aluminum alloys is the micro-arc oxidation (MAO) method. This is an electrochemical process in combination with micro-arc-discharges phenomena at the anode-electrolyte border, which allows forming ceramic coatings of aluminum oxides on the surface, including its high-toughness and wear-resistant phase - α-Al2O3 (corundum). MAO-technology is a highly efficient and environmentally friendly process. At the forming of such a coating on the threaded part and in the tool joint zone of the pipe, a barrier for contact corrosion between the steel tool joint and the surface of the aluminum pipe is created. In this work, contact corrosion on samples in a pair of 1953T1 aluminum alloy - 40KhN2MA steel in a 5% NaCl solution at 80 °C was investigated. The data obtained showed the effectiveness of using protective MAO-coating to reduce contact corrosion and increase the reliability of the tool joint threaded connection of LAIDP.

Process Safety for Sustainable Applications

2021 ◽  
pp. 2150033
Author(s):  
Alexander Stolar ◽  
Anton Friedl
Keyword(s):  
Risk Management ◽  
Operating Conditions ◽  
Process Safety ◽  
Implementation Effort ◽  
Wide Range ◽  
System Improvement ◽  
Management Techniques ◽  
Universal Applicability ◽  
Abnormal Operating Conditions ◽  
Business Sectors

Process safety techniques have been used in industry for decades to make processes and systems safer and to optimize them, and thus to improve sustainability. Their main aim is to prevent damage to people, equipment and the environment. In this overview, process safety and risk management techniques are shown that can be applied in the different life cycle phases of an application without much implementation effort. A broad and universal applicability in a wide range of business sectors is set as the main focus. In addition to the application of system improvement techniques, a number of additional considerations, such as maintenance and the consideration of abnormal operating conditions, are included in order to be able to comprehensively improve a system or application.

A Solution to CT Saturation by Gregory Newton's Backward Interpolation

2011 ◽  
Vol 12 (6) ◽  
Author(s):  
Sukanta Das ◽  
Gautam Bandyopadhyay ◽  
Prasid Syam
Keyword(s):  
Operating Conditions ◽  
Discrete Wavelet ◽  
Mother Wavelet ◽  
Secondary Current ◽  
Steel Core ◽  
Protection Systems ◽  
Controller Board ◽  
Abnormal Operating Conditions ◽  
Secondary Side ◽  
Primary Current

Saturation problem in steel core Current Transformers (CTs) causes dreadful effects in protection systems as true replica of the primary current is not always reflected in CT secondary side under abnormal operating conditions. This is why detection and production of exact replica of primary current in the CT secondary side is very crucial. This paper presents a discrete wavelet transform based application using 'Daubechies3’ as mother wavelet for the detection of saturation. The compensation of saturated signal is done by Gregory Newton's Backward Interpolation (GNBI). The whole scheme of detection of CT saturation and compensation of saturated CT secondary current has been successfully tested on various saturated signals simulated in MATLAB/SIMULINK with various case studies. Finally, the scheme is validated in real time using DS1104 controller board of dSPACE. The results obtained are very encouraging.

Considerations for Training Simulations of Liquid Pipelines

2006 ◽  
Author(s):  
Brett Christie ◽  
David Norris
Keyword(s):  
Capital Cost ◽  
Operating Conditions ◽  
Pipeline System ◽  
Training Environment ◽  
Control Center ◽  
Scada System ◽  
Flow Charts ◽  
Set Up ◽  
Abnormal Operating Conditions

The use of integrated offline training simulators within the liquids pipeline community has not been widespread. Some companies opt to use a stand-alone generic pipeline simulation, which has advantages of ease of set up and offer relatively lower capital cost. They can also be effective in training on basic hydraulics under both normal and abnormal operating conditions. However, since they do not train on the actual pipeline system of the company, trainees do not learn any of the specifics of their company’s pipeline. Also, if the system is not interfaced to the pipeline SCADA system, trainees may have difficulty transferring what they have learned into their day to day control of the pipeline. This paper outlines the major considerations for ensuring that the offline training environment is as a realistic depiction of the actual pipeline control center as possible. Techniques and guidelines, such as Gap analyses, cause & effect diagrams, and flow charts are presented.

An Efficient Sensorless Slip Dependent Thermal Motor Protection Schemes Applied to Submersible Pumps

2015 ◽  
Vol 14 ◽  
pp. 75-86 ◽  
Author(s):  
Mohamed I. Abdelwanis ◽  
Fatallah Selim ◽  
Ragab Abdel-Aziz El-Sehiemy
Keyword(s):  
Induction Motor ◽  
Motor Performance ◽  
Estimation Algorithm ◽  
Operating Conditions ◽  
Motor Speed ◽  
Rotor Resistance ◽  
Three Phase ◽  
Submersible Motor ◽  
Abnormal Operating Conditions ◽  
Motor Protection

This paper proposes a sensorless procedure to estimate the induction motor speed and the dependable heat contents of the stator and rotor sides. The proposed procedure is based on the electrical models of a three phase Induction Motor (IM). The motor electrical models for normal and abnormal will be discussed and a technique is introduced for accommodating frequency dependent skin effect of the rotor resistance using a simple proposed speed estimation algorithm. The electrical models are customized from the positive and negative sequence networks. The speed detection is based on the rotor parameters slip dependent. The models are then used to analyze different operating conditions of the motor. Two thermal motor protection schemes are suggested. The first scheme is dependent on the stator side while the other scheme is developed for rotor side. The Matlab software is used for this purpose to emulate efficiently the proposed estimation procedures through a complete motor modeling which is fed from the power grid. Finally, the results provide the motor performance characteristics which involve current, torque, speed and stator/rotor temperature versus time for numerous operating conditions. It is concluded that the proposed sensorless procedure is efficient to protect the induction motors against abnormal starting as well as the overheating on either stator or rotor sides. Also, the proposed sensorless estimation for speed and temperature is reliable for submersible motor applications. The proposed schemes can be considered as costless preventive maintenance procedure.Index Terms: induction motor, slip dependent, sensorless, thermal model, abnormal operating conditions.

Increasing the endurance limit and corrosion resistance of light-alloy drill pipes

1977 ◽  
Vol 12 (5) ◽  
pp. 530-532
Author(s):  
V. I. Pokhmurskii ◽  
A. M. Prishlyak ◽  
A. T. Levchenko ◽  
K. M. Gil'man
Keyword(s):  
Corrosion Resistance ◽  
Endurance Limit ◽  
Light Alloy ◽  
Drill Pipes

scholarly journals Development of a Modularity Index for Reliability Assessment of Isolation Valve Systems

10.29007/m56l ◽  
2018 ◽  
Author(s):  
Orazio Giustolisi
Keyword(s):  
Failure Probability ◽  
Water Distribution ◽  
Reliability Assessment ◽  
Water Distribution Network ◽  
Operating Conditions ◽  
System Component ◽  
Hydraulic Systems ◽  
Mechanical Reliability ◽  
Abnormal Operating Conditions ◽  
Modularity Index

Mechanical reliability refers to the assessment of the capacity of the water distribution network (WDN) to provide a correct service to the different type of costumers under abnormal operating conditions due to a failure of a system component. It depends on the effectiveness of the isolation valve system (IVS) and on the failure probability of components. Starting from the calculation of the actual customer demands during abnormal operating conditions of the hydraulic systems due to valve shutdowns and the failure probability of the separated segments, the work develops a metric for WDN reliability assessment. The finding is that the topologic part of WDN reliability assessment, relating to the IVS, is based on the risk of disconnection. Starting from it, the works develops a special modularity index for IVS reliability assessment.

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