Structural Behavior of Dented Tubular Members Under Lateral Loads

2004 ◽  
Vol 126 (2) ◽  
pp. 191-197 ◽  
Author(s):  
Claudio Ruggieri ◽  
Jose´ Alfredo Ferrari,
Keyword(s):  
Oil And Gas ◽  
Numerical Solutions ◽  
Production Systems ◽  
Structural Response ◽  
Local Deformation ◽  
Structural Behavior ◽  
Lateral Loads ◽  
Linear Behavior ◽  
Failure Assessment ◽  
Varying Length

Structural behavior of tubular members with dent damaged caused by local indentation remains a key issue for the safety and failure assessment of critical structures, including marine facilities, oil and gas pipelines. This failure mode most often arises from very large localized plastic deformations caused mainly by excessive or accidental loads such as, for example, during the collision of adjacent risers in deepwater floating production systems (FPS). The complex interaction between the local deformation in the dented region and global bending of the tubular member may severely reduce the plastic collapse load which strongly affects its load-deflection behavior. This study presents an experimental and numerical investigation of the structural behavior of a dented tubular member under lateral load which is applicable to marine risers. Experimental load-deflection curves measured using a 412″O.D. (114 mm) API N80 pipe (580 MPa yield stress) with varying length characterize the plastic response during local indentation and global bending. 3D finite element models are employed to generate numerical solutions describing the large deformation, non-linear behavior for the tested pipes. The experimental results agree well with the numerical results. The analyses provide further insight into the structural response of tubular members and risers with dent damage effects.

Experimental and Numerical Study of Damaged Tubular Members Under Lateral Loads

2002 ◽  
Author(s):  
Claudio Ruggieri ◽  
Jose´ Alfredo Ferrari
Keyword(s):  
Oil And Gas ◽  
Numerical Solutions ◽  
Production Systems ◽  
Numerical Study ◽  
Structural Response ◽  
Local Deformation ◽  
Structural Behavior ◽  
Lateral Loads ◽  
Nuclear Facilities ◽  
Linear Behavior

Structural behavior of dent damaged tubular members by local indentation remains a key issue for the safety and failure assessment of critical structures, including marine and nuclear facilities, oil and gas pipelines. This failure mode most often arises from very large localized plastic deformations caused mainly by excessive or accidental loads such as, for example, during the collision of adjacent risers in deepwater floating production systems (FPS). The complex interaction between the local deformation in the dented region and global bending of the tubular member may severely reduce the plastic collapse load while, at the same time, strongly affecting its load-deflection behavior. This study presents an experimental and numerical investigation of the structural behavior of a dented tubular member under lateral load which is applicable to marine risers. Experimental load-deflection curves measured using a 4 1/2″ O.D. (114 mm) API N80 pipe (580 MPa yield stress) with varying length characterize the plastic response during local indentation and global bending. 3D finite element models are employed to generate numerical solutions describing the large deformation, non-linear behavior for the tested pipes. The experimental results agree well with the numerical results. The analyses provide further insight into the structural response of tubular members and risers which dent damage effects.

Stability of offshore structures in shallow water depth

2011 ◽  
Vol 2 (2) ◽  
pp. 320-333
Author(s):  
F. Van den Abeele ◽  
J. Vande Voorde
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
Fossil Fuels ◽  
Oil And Gas ◽  
Structural Response ◽  
Offshore Structures ◽  
Exploration And Production ◽  
Subsea Pipelines ◽  
Wave Induced ◽  
Shallow Water Depth

The worldwide demand for energy, and in particular fossil fuels, keeps pushing the boundaries of offshoreengineering. Oil and gas majors are conducting their exploration and production activities in remotelocations and water depths exceeding 3000 meters. Such challenging conditions call for enhancedengineering techniques to cope with the risks of collapse, fatigue and pressure containment.On the other hand, offshore structures in shallow water depth (up to 100 meter) require a different anddedicated approach. Such structures are less prone to unstable collapse, but are often subjected to higherflow velocities, induced by both tides and waves. In this paper, numerical tools and utilities to study thestability of offshore structures in shallow water depth are reviewed, and three case studies are provided.First, the Coupled Eulerian Lagrangian (CEL) approach is demonstrated to combine the effects of fluid flowon the structural response of offshore structures. This approach is used to predict fluid flow aroundsubmersible platforms and jack-up rigs.Then, a Computational Fluid Dynamics (CFD) analysis is performed to calculate the turbulent Von Karmanstreet in the wake of subsea structures. At higher Reynolds numbers, this turbulent flow can give rise tovortex shedding and hence cyclic loading. Fluid structure interaction is applied to investigate the dynamicsof submarine risers, and evaluate the susceptibility of vortex induced vibrations.As a third case study, a hydrodynamic analysis is conducted to assess the combined effects of steadycurrent and oscillatory wave-induced flow on submerged structures. At the end of this paper, such ananalysis is performed to calculate drag, lift and inertia forces on partially buried subsea pipelines.

3-D Numerical Simulations of Subsea Jumper Transporting Intermittent Slug Flows

2018 ◽  
Author(s):  
Jihyeon Kim ◽  
Narakorn Srinil
Keyword(s):  
Slug Flow ◽  
Oil And Gas ◽  
Process Condition ◽  
Structural Response ◽  
Dynamic Responses ◽  
Operating Pressure ◽  
Computational Performance ◽  
Fluid Properties ◽  
Slug Flows ◽  
Interaction Approach

Subsea jumper is the steel pipe structure to connect wellhead and subsea facilities such as manifolds or processing units in order to transport the produced multiphase flows. Generally, the jumper consists of a goalpost with two loop structures and a straight pipe between them, carrying the multiphase oil and gas from the producing well. Due to the jumper pipe characteristic geometry and multi-fluid properties, slug flows may take place, creating problematic fluctuating forces causing the jumper oscillations. Severe dynamic fluctuations cause the risk of pipe deformations and resonances resulting from the hydrodynamic momentum/pressure forces which can lead to unstable operating pressure and decreased production rate. Despite the necessity to design subsea jumper with precise prediction on the process condition and the awareness of slug flow risks, it is challenging to experimentally evaluate, identify and improve the modified design in terms of the facility scale, time and cost efficiency. With increasing high computational performance, numerical analysis provides an alternative approach to simulate multiphase flow-induced force effects on the jumper. The present paper discusses the modelling of 3-D flow simulations in a subsea jumper for understanding the development process of internal slug flows causing hydrodynamic forces acting on the pipe walls and bends. Based on the fluctuating pressure calculated by the fluid solver, dynamic responses of the jumper pipe are assessed by a one-way interaction approach to evaluate deformation and stress. A potential resonance is discussed with the jumper modal analysis. Results from the structural response analyses show dominant multi-modal frequencies due to intermittent slug flow frequencies. Numerical results and observed behaviors may be useful for a comparison with other simulation and experiment.

scholarly journals Numerical Evaluation on Improvement Performance of Waved Connection to Reduce Damage on Buried Gas Pipeline

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Seyed Mohammad Seyed Kolbadi ◽  
Nemat Hassani ◽  
Mohammad Safi
Keyword(s):  
Oil And Gas ◽  
Shell Element ◽  
Oil And Gas Industry ◽  
Local Deformation ◽  
Limited Area ◽  
Buried Pipes ◽  
Gas Industry ◽  
Rotational Joint ◽  
Metal Pipes ◽  
Buried Gas Pipeline

One of the major challenges for the oil and gas industry is to keep buried metal pipes safe from faulting. This paper discusses about a solution to keep buried pipes safe. In this study, after examining the different dimensions of the effect of wave connection on improving the performance of buried metal pipes, by changing the geometric shape of the wave connection such as doubling it, the behavior of the pipe is greatly improved. Waved connections, by their local deformation, create a rotational joint in a limited area so that other parts of the pipe remain intact. In this paper, the behavior of buried pipes due to slip direction fault displacement by modelling with Abacus software version 2017 and selection of 4-node shell element and 8-node shell element have been used for pipe and soil modelling, respectively. In this paper, by comparing to a single waved connection with a double waved connection, the performance of the pipe due to the faulting phenomenon was evaluated. The results show the improvement of the excellent performance of the double joint by reducing the plastic strain values. In addition to increasing the ductility of the pipe, the double connection has been able to reduce the strain values by about 50% compared to the single connection. In general, this paper shows that the use of wave connections can significantly increase the level of safety of buried gas pipelines without increasing the cost.

Effects of Nonlinear Riser-Soil Interaction Model on Fatigue Design of Steel Catenary Riser Under Random Waves

2017 ◽  
Author(s):  
Mehrdad Kimiaei
Keyword(s):  
Oil And Gas ◽  
Structural Response ◽  
Interaction Model ◽  
Nonlinear Behavior ◽  
Random Waves ◽  
Steel Catenary Riser ◽  
Oil And Gas Fields ◽  
Fatigue Design ◽  
Time Histories ◽  
Main Components

Steel Catenary Risers (SCRs) are one of the main components in development of oil and gas fields in deep waters. Fatigue design of SCRs in touch down zone (TDZ) is one of the main engineering challenges in design of riser systems. Nonlinear riser-soil interaction models have recently been introduced and used widely in advanced structural analysis of SCRs. Due to hysteretic nonlinear behavior of the soil, SCR system will show different structural response under different loading time histories. This paper investigates the effects of nonlinear riser-soil interaction in the TDZ on fatigue performance of an example SCR subjected to randomly generated waves. Sensitivity of fatigue life of the system, location of the critical node and the maximum stress range to different wave realizations and different soil types are discussed in detail.

Technical and Economic Considerations in Developing Offshore Oil and Gas Prospects Using Floating Production Systems

1986 ◽  
Vol 23 (03) ◽  
pp. 253-270
Author(s):  
W. J. Drawe ◽  
Anil Raj ◽  
P. J. Rawstron
Keyword(s):  
Decision Tree ◽  
Oil And Gas ◽  
Production Systems ◽  
State Of The Art ◽  
Related System ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Economic Considerations

This paper discusses the use of floating production systems (FPS) in developing offshore fields and includes consideration of related system and subsystem options. The system options are discussed from their relative technical and economic merits. Proven conventional and state-of-the-art technology as well as technical limitations are included. A decision tree matrix has been developed for use in the early planning stages to assist in determining preferred baseline options for selecting an approach. Systems from the mud-line upwards to the floating hull, and on-board systems, are included.

A procedure to estimate the lateral force in clay-pipe interaction after breakout

2021 ◽  
pp. 3
Author(s):  
Pablo Cesar Trejo ◽  
Jose Renato M.S. Oliveira ◽  
Márcio S.S. Almeida ◽  
Maria C.F. Almeida ◽  
Mario A. Vignoles
Keyword(s):  
Oil And Gas ◽  
New Technologies ◽  
Production Systems ◽  
Low Cost ◽  
Experimental Studies ◽  
Leading Edge ◽  
Lateral Force ◽  
Pipeline System ◽  
Centrifuge Tests ◽  
Clay Pipe

The development of new offshore oil and gas fields is continuously expanding to ultra-deep waters. This tendency and the necessity of reducing project costs have been stimulating the development of new technologies as well as the enhancement of floating production systems. In this regard, pipelines and flexible riser systems have been getting more attention due to its low cost of installation and operation. In order to project a pipeline system, it is important to understand the pipe-soil interaction mechanisms and quantify the influence of soil behaviour on pipe response caused by lateral movement such as thermal buckling. The loads that a pipeline is subjected have been a topic of many experimental studies that aim to reproduce those loads in a realistic manner. This present study concerns the analysis of lateral clay-pipe interaction associated with large deformations and berm formation process at the leading edge of the pipe during movement at given burial depths. A series of centrifuge tests was conducted to assess the relationship between horizontal force and lateral pipe displacement. The breakout force experimental results were compared with different literature proposals, showing a good agreement. A procedure was also proposed to evaluate the normalized lateral force through the combination of two different approaches. The results showed a good comparison with the centrifuge experimental data.

Status of Deepwater Production Systems

1991 ◽  
Vol 28 (01) ◽  
pp. 39-45
Author(s):  
Edward E. Horton
Keyword(s):  
Gulf Of Mexico ◽  
Oil And Gas ◽  
Production Systems ◽  
Energy Resources ◽  
Innovative Technology ◽  
Oil Exploration ◽  
Exploration And Production ◽  
Near Future

As oil exploration and production moves farther offshore, innovative technology is required to exploit energy resources in ever deeper waters. This paper covers two areas of deepwater production: offshore Brazil and the Gulf of Mexico. The types of wells and their capacity are described as well as the alternative platform designs, both fixed and semisubmersible, being used to recover both oil and gas from depths greater than 1500 ft. The paper outlines why these deepwater regions are of interest now and describes developments that are expected in the near future.

scholarly journals Evaluation of Calcium Carbonate Inhibitors Using Sintered Metal Filter in a Pressurized Dynamic System

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1849 ◽  
Author(s):  
Adriana Velloso Alves de Souza ◽  
Francisca Rosário ◽  
João Cajaiba
Keyword(s):  
Calcium Carbonate ◽  
Dynamic System ◽  
Heterogeneous Nucleation ◽  
Oil And Gas ◽  
Production Systems ◽  
Dynamic Test ◽  
Gas Production ◽  
Oil And Gas Production ◽  
Sintered Metal ◽  
Organophosphorus Inhibitors

Calcium carbonate scale is formed during oil and gas production. Tube-blocking tests (TBTs) are used to define the minimum inhibitory concentration (MIC) in order to prevent scale adhesion in the petroleum production system equipment. However, non-adhered crystals may favor heterogeneous nucleation to other deposits such as calcium naphthenates, causing a more severe scale problem, increasing production losses and treatment costs. The objective of the present work was to develop a new dynamic test methodology to determine the MIC for CaCO3 using a sintered metal filter. Organophosphorus inhibitors were selected for comparison with the conventional dynamic tube-blocking system. The results demonstrated that the use of the filter allowed an MIC of the inhibitors to be obtained considering the precipitation prevention. The inhibitor concentration in the conventional tube-blocking system does not prevent precipitation, acting only on adhesion and crystal growth on the capillary wall. Tests to evaluate the potential of calcium naphthenates formation in a naphthenate flow rig dynamic system demonstrated the influence of heterogeneous nucleation from non-adhered carbonate crystals, potentially aggravating deposition problems in oil and gas production systems.

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