Through Barrier Diagnostics to Locate Multiple Barrier Failures in Complex Well Failure Scenario and to Enable Successful P&A

2021 ◽  
Author(s):  
Maxim Volkov ◽  
Asiya Zaripova ◽  
Sultan Sikander ◽  
Jamal Ezwai ◽  
Islam Altaeb ◽  
...  
Keyword(s):  
Fluid Composition ◽  
Integrity Assessment ◽  
Barrier Failure ◽  
Input Parameters ◽  
Concept Planning ◽  
Failure Scenario ◽  
Intervention Team ◽  
Surface Diagnostics ◽  
Selection Of ◽  
Complex Well

Abstract Objectives/Scope A 60-year-old well exhibited a leak at the surface and sustained annuli pressure (SAP) in all three annuli - A, B and C. The age of the well coupled with the symptoms suggested a complex multi-barrier failure scenario that needed to be diagnosed quickly and accurately so that the well could be secured safely. The paper shows how the comprehensive set of downhole diagnostics, including metal and cement barriers integrity assessment, aided in planning and execution of well intervention to secure the indicated failures. The well intervention team selected an approach to investigate the barriers status prior the rig came to the location. Surface diagnostics included evaluation of pressure trends, completion design, leak fluid composition and drilling records analysis which guided the selection of downhole survey. The input parameters for downhole through barrier diagnostics were: Downhole through barrier diagnostics targeted the evaluation of leak paths and failures in well barriers and included: This paper explores the concept, planning, execution and achieved results of the downhole diagnostics performed and how the results were implemented by Operator.

scholarly journals Building stock energy modeling: Feasibility study on selection of important input parameters using stepwise regression

2020 ◽  
Author(s):  
Reza Arababadi ◽  
Hariharan Naganathan ◽  
Mohsen Saffari Pour ◽  
Atefeh Dadvar ◽  
Kristen Parrish ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Stepwise Regression ◽  
Energy Modeling ◽  
Building Stock ◽  
Input Parameters ◽  
Important Input ◽  
Selection Of

Integrity Assessment of Multiple Dents in Oil and Gas Pipelines Using Probabilistic Design Analysis

2010 ◽  
Author(s):  
Husain Mohammed Al-Muslim ◽  
Abul Fazal M. Arif
Keyword(s):  
Oil And Gas ◽  
Mechanical Damage ◽  
Pipe Material ◽  
Probabilistic Design ◽  
Gas Pipelines ◽  
Pressure Loading ◽  
Integrity Assessment ◽  
Oil And Gas Pipelines ◽  
Input Parameters ◽  
Pipe Geometry

Mechanical damage in transportation pipelines is a threat to its structural integrity. Failure in oil and gas pipelines is catastrophic as it leads to personal fatalities, injuries, property damage, loss of production and environmental pollution. Therefore, this issue is of extreme importance to Pipeline Operators, Government and Regulatory Agencies, and local Communities. As mechanical damage can occur during the course of pipeline life due to many reasons, appropriate tools and procedures for assessment of severity are necessary. There are many parameters that affect the severity of the mechanical damage related to the pipe geometry and material properties, the defect geometry and boundary conditions, and the pipe state of strain and stress. Moreover, multiple damaged areas may exist and interact like in the case of a hit by a multiple-tooth excavator. The main objective of this paper is to determine the distance and orientation where interaction of multiple dents is significant. The strain and stress fields are evaluated for static pressure loading and the stress range and fatigue life are evaluated for cyclic pressure loading. Accordingly, guidelines are developed for the integrity assessment of multiple dents in oil and gas pipelines. The input parameters of the problem including the pipe material, pipe geometry, dent dimensions, and distance and orientation between two dents have a great variability. Therefore, probabilistic design approach is applied to determine the sensitivity and correlation between the output and input parameters. The base case deterministic FEA model has been validated with full-instrumented full-scale tests conducted by Pipeline Research Council International as part of their active program to fully characterize mechanical damage.

scholarly journals Formulation of the membership function and determination of the input of fuzzy loads in the structural fuzzy analyzing problem

2007 ◽  
Vol 29 (2) ◽  
pp. 117-126
Author(s):  
Nguyen Van Pho
Keyword(s):  
Membership Function ◽  
Input Parameter ◽  
Design Standards ◽  
Input Parameters ◽  
Triangular Membership Function ◽  
Probabilistic Density Function ◽  
Fuzzy Parameters ◽  
Selection Of ◽  
The Membership Function

The fuzzy analyzing process consists of different steps. In this paper, the author considers only the method for formulation of the membership function of fuzzy loads acting on the structure. Based on the membership function of fuzzy loads, the combinations of deterministic of the regression analyzing process will be determined. The membership function of fuzzy loads is selected by the triangular membership function. It is in conformity with the concept on selection of loads in the design standards. The combination of inputs for the analyzing process will be determined, based on the number of present times of the value of input parameters (including the deterministic parameters, fuzzy parameters and the random ones) in the schema of analysis. The number of present times of input parameters is either proportional to value of the corresponding membership function or to the value of the probabilistic density function. A method for determining the appropriate combination of deterministic inputs so that each input parameter will present only one time in each combination is proposed. To illustrate the proposed method, an example on the determination of input combinations of tornado's velocity in Vietnam is presented.

scholarly journals D NUMBERS – FUCOM – FUZZY RAFSI MODEL FOR SELECTING THE GROUP OF CONSTRUCTION MACHINES FOR ENABLING MOBILITY

2021 ◽  
Vol 19 (3) ◽  
pp. 447
Author(s):  
Darko Božanić ◽  
Aleksandar Milić ◽  
Duško Tešić ◽  
Wojciech Salabun ◽  
Dragan Pamučar
Keyword(s):  
Decision Making ◽  
Hybrid Model ◽  
Input Parameters ◽  
D Numbers ◽  
Weight Coefficients ◽  
Selection Of ◽  
Decision Making Support

The paper presents a hybrid model for decision-making support based on D numbers, the FUCOM method and fuzzified RAFSI method, used for solving the selection of the group of construction machines for enabling mobility. By applying D numbers, the input parameters for the calculation of the weight coefficients of the criteria were provided. The calculation of the weight coefficients of the criteria was performed using the FUCOM method. The best alternative was selected using the fuzzified method, which was conditioned by the specificity of the issue so that in this case, the selection of the best alternative was made using the fuzzified RAFSI method.

scholarly journals Selection of PAUT probes for submarine pressure hull integrity assessment

2020 ◽  
Vol 12 ◽  
pp. 578-595
Author(s):  
Min-jae Jung ◽  
Byeong-cheol Park ◽  
Chae-og Lim ◽  
Jae-chul Lee ◽  
Sung-chul Shin
Keyword(s):  
Integrity Assessment ◽  
Selection Of

scholarly journals Effect Range of the Material Constraint-II. Interface Crack

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 696 ◽  
Author(s):  
Yue Dai ◽  
Jie Yang ◽  
Lei Wang
Keyword(s):  
Interface Crack ◽  
Welded Joints ◽  
Integrity Assessment ◽  
Center Crack ◽  
Fracture Behaviors ◽  
Selection Of ◽  
Material Constraints

The selection of fracture behaviors used in the structure integrity assessment has significant implications on the accuracy of the assessment. The effect range of the material constraint is an important factor which effects the fracture behaviors of structures and exists in the different kinds of welded joints with the center crack. However, for the material constraint induced by an interface crack, which also appears widely in the welded joints, it is not clear whether the effect range exists or not. The further study of the effect range of the material constraint for the welded joints with interface crack is meaningful. Thus, in this study, different basic models with interface crack were designed, the fracture behaviors of these basic models under different material constraints were calculated, and the effect range of the material constraint induced by interface crack were studied. This study about the interface crack and the previous study about the center crack provide an additional basis for an accurate structure integrity assessment.

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