Fatigue Analysis of Free Span for Submarine Pipeline

2013 ◽  
Author(s):  
Jie Dong ◽  
Xuedong Chen ◽  
Bing Wang ◽  
Weihe Guan ◽  
Tiecheng Yang ◽  
...  
Keyword(s):  
Failure Mode ◽  
Fatigue Failure ◽  
Oil And Gas ◽  
Cross Flow ◽  
Fatigue Analysis ◽  
Submarine Pipeline ◽  
Actual Service ◽  
Offshore Oil And Gas ◽  
Offshore Oil

The offshore oil and gas are mainly gathered and transported by submarine pipeline due to its merits of continuity, convenience and less effect of climate. Free span often occurs because of the unevenness and scour of seabed and endangers the safe running of pipeline. Fatigue is one main failure mode for free span. In this paper, combined with the actual service status of submarine pipeline, considering the variation of velocity with time, the load of wave and current, the effect of cross-flow vibration to the in-line vibration, the fatigue failure of the detected free span is analysed primarily and detailedly by correlated standard, and the results are given.

scholarly journals Causes and Treatment Measures of Submarine Pipeline Free-Spanning

2020 ◽  
Vol 8 (5) ◽  
pp. 329
Author(s):  
Bo Zhang ◽  
Rui Gong ◽  
Tao Wang ◽  
Zhuo Wang
Keyword(s):  
Oil And Gas ◽  
Wave Flow ◽  
Submarine Pipeline ◽  
Structural Support ◽  
Seabed Topography ◽  
Treatment Measures ◽  
Oil And Gas Resources ◽  
Offshore Oil And Gas ◽  
Water Plants ◽  
Offshore Oil

Submarine pipelines, as arteries for offshore oil and gas transportation, play a particularly important role in the exploitation of offshore oil and gas resources. Since the world’s first submarine pipelines were laid in the Gulf of Mexico, numerous failures have been caused by pipeline free-spanning. This paper provides a review of the causes and treatment measures for the free span of submarine pipeline. Various factors cause the free span of submarine pipelines, including wave flow scouring, fluctuations in seabed topography, residual stress or thermal stress of pipelines, and human activities. The scour of the wave current is the main factor affecting free span; the research on sediment starting and equilibrium depth during scour is reviewed in-depth. For the span treatment of submarine pipelines, the main measures available at present include the re-digging trench burying, structural support, covering bionic water plants, and choke plate self-burying. For each, the principle, advantages, disadvantages, and research are discussed. This review provides a convenient resource for understanding the causes of submarine free-spanning pipelines and choosing suitable treatment measures.

Numerical Simulation of Temperature Drop along Submarine Oil Pipeline

2012 ◽  
Vol 524-527 ◽  
pp. 1484-1489 ◽  
Author(s):  
Gui Hong Pei ◽  
Dong Xu Han ◽  
Xian Guo Deng
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Oil And Gas ◽  
Temperature Drop ◽  
Comsol Multiphysics ◽  
Fluid Viscosity ◽  
Submarine Pipeline ◽  
Oil Pipeline ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Most of the offshore oil and gas is transported to land by submarine pipeline, and then processed. In order to decrease the fluid viscosity and increase flowing roperty, the pipeline is usually be heated. To evaluate the temperature change during oil and gas transport, this paper build the the physical and mathematical model of submarine oil pipeline, and using the software COMSOL Multiphysics to simulate temperature drop along the pipe, which provides a reliable parameters for the design of pipeline.

Use of Technology Qualification in Offshore Oil and Gas Operations: An FMECA Analysis for Mitigating Potential Failures

2014 ◽  
Author(s):  
R. M. Chandima Ratnayake ◽  
S. M. Samindi M. K. Samarakoon ◽  
Ove T. Gudmestad
Keyword(s):  
Failure Mode ◽  
Oil And Gas ◽  
New Technology ◽  
Illustrative Case ◽  
Use Of Technology ◽  
Mode Effect ◽  
Oil And Gas Operations ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Criticality Analysis

The implementation of new technology introduces uncertainties. Due to the consequence of failures, these uncertainties generate risks for the technology developers, manufacturers, vendors, operators and end-users. In this context, the application of proven technology in a new environment is also considered as new technology. In essence, a system as a whole is considered to be new technology when it has been assembled in a novel way consisting of individual components built using proven technology. The concerns in deploying new technology are significant in offshore oil and gas (O&G) operations, as they involve hazardous procedures. Moreover, technology is considered new when applied to offshore O&G operations due to the variability of technical challenges from field to field and the complexity of systems with limited space and experience in a harsh and sensitive environment. When new technology is integrated into a large system, it is necessary to evaluate the effect on the total system’s reliability in order to increase the level of confidence via a technology qualification procedure. Hence, it is vital to interpret how the risks are managed by the provision of evidence to reduce uncertainties. This manuscript presents an illustrative case of failure mode, effect and criticality analysis (FMECA) in qualifying new technology when it is implemented in an unfamiliar environment.

Drilling and Service Contracts in Offshore Oil and Gas Operations

1973 ◽  
Vol 11 (3) ◽  
pp. 480
Author(s):  
J. M. Killey
Keyword(s):  
Oil And Gas ◽  
Oil Industry ◽  
Offshore Drilling ◽  
Oil Companies ◽  
Drilling Rig ◽  
Service Contracts ◽  
Oil And Gas Operations ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Offshore Operations

As onshore oil and gas deposits are becoming more difficult to locate, and as the world demands for energy continue to increase at an alarming rate, oil companies are channeling much of their exploration activities towards offshore operations, and in particular, towards operations centered off Canada's coast lines. Because of the environment, offshore drilling presents problems which are novel to the onshore-geared oil industry. J. M. Killey discusses in detail many of the considerations involved in drafting the offshore drilling contract, concentrating on problems such as the liability of the various parties; costs; scheduling; pollution; conflict of laws; etc. Similarly, he discusses service contracts (such as supply boat charters; towing services; helicopter services; etc.^ which are necessity to the operation of an offshore drilling rig. To complement his paper, the author has included number of appendices which list the various considerations lawyer must keep in mind when drafting contracts for offshore operations.

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