Assess the Seismic Wave Influence on Buried Pipelines With ASCE Soil-Spring Model

2014 ◽  
Author(s):  
Fan Zhang ◽  
Yong-Yi Wang
Keyword(s):  
Soil Properties ◽  
Seismic Wave ◽  
Seismic Waves ◽  
Oil And Gas ◽  
Field Conditions ◽  
Analytical Models ◽  
Spring Model ◽  
Analysis Model ◽  
Buried Pipelines ◽  
Element Analysis

The propagation of seismic waves introduces strains in buried pipelines. Considerable amount of work was performed in 1970’s and early 1980’s in this subject area. A good representative of such work is the model developed by Shinozuka and Koike in 1979. The analytical models developed during this period are still the major tools in assessing the influence of seismic waves on buried pipelines. The foundations of these models are the assumptions and some simplified soil and pipe interaction models available at the time. In 1984 a spring model representing the interaction between soil and buried pipes was introduced by American Society of Civil Engineers (ASCE) in Guidelines for the Seismic Design of Oil and Gas Pipeline Systems. An improved version of the ASCE model was later published in Guidelines for the Design of Buried Steel Pipe by American Lifelines Alliance in 2001. Since then, the spring model has become one of the most widely used models by various industries and has been incorporated into commercial software, such as AutoPIPE®. Most of the soil properties in fields are represented by the parameters of the ASCE soil-spring model. However, it is inconvenient to assess the influence of seismic waves on pipelines with soil properties described by parameters of the ASCE model. There are differences between the ASCE soil-spring model and the soil-pipe interactions in the seismic wave analysis model. In this paper the foundation of Shinozuka and Koike model is first reviewed. The model is then revised to accommodate the ASCE soil-spring model. Some unnecessary assumptions in the Shinozuka and Koike model are removed to make the model more generally applicable to various field conditions. Finally, the revised model is verified by finite element analysis under several typical pipeline field conditions, including straight segments and segments with bends and tees.

scholarly journals Study on Synthesis Method of Multipoint Seismic Waves for Buried Oil and Gas Pipeline in Shaking Table Tests

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Jian-Bo Dai ◽  
Gui-Di Zhang ◽  
Cheng-Tao Hu ◽  
Kai-Kai Cheng
Keyword(s):  
Seismic Wave ◽  
Seismic Waves ◽  
Oil And Gas ◽  
Shaking Table Test ◽  
Synthesis Method ◽  
Linear Structure ◽  
Gas Pipeline ◽  
Shaking Table ◽  
Infinite Length ◽  
Shaking Table Tests

The buried oil and gas pipeline is a linear structure with infinite length. In the shaking table test of its seismic response, it is necessary to input the spatially related multipoint seismic wave considering the propagation characteristics of ground motion. The multipoint seismic excitation shaking table tests and loading scheme of buried oil and gas pipelines are designed and formulated. The synthesis method of spatial correlation multipoint seismic wave for the buried oil and gas pipeline test is proposed in this study. The values of relevant parameters are analyzed, and corresponding program is compiled by MATLAB. The results show that the developed multipoint excitation shaking table seismic wave input scheme is reasonable. At the same time, the synthesized multipoint seismic wave based on the actual seismic record and artificial random simulation seismic wave can meet the test requirements, which suggests the testing effect is good.

FE Simulation of Torque and Drag inside Borehole of Oil and Gas Wells (Part II)

2015 ◽  
Vol 723 ◽  
pp. 240-245
Author(s):  
Yousif E.A. Bagadi ◽  
De Li Gao ◽  
Abdelwahab M. Fadol
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth.The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. A FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results.The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

A Seismic Wave Oblique Incidence Method and the Application in Gravity DAM Seismic Research

2014 ◽  
Vol 08 (04) ◽  
pp. 1450011 ◽  
Author(s):  
Li Chen ◽  
Liaojun Zhang
Keyword(s):  
Seismic Wave ◽  
Oblique Incidence ◽  
Large Scale ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Near Field ◽  
P Wave ◽  
Gravity Dam ◽  
Uniform Motion ◽  
Element Analysis

The incidence of seismic wave is generally assumed to be vertical in seismic analysis of large-scale hydraulic structures, but during some near-field earthquakes, the direction of seismic waves is at certain angle to the ground. The non-uniform motion produced by oblique incidence can significantly affect the structures. In this paper, based on the theories of wave motion an oblique P-wave and SV-wave incidence method based on viscous-spring boundary was introduced into finite element analysis, which can accurately simulate the incidence at different oblique angles. Then the proposed method was applied in seismic analysis of a gravity dam located in southwest China. The seismic responses under oblique incidence of P-wave and SV-wave at different oblique angles were discussed. The results indicated that the seismic response was obviously influenced by the oblique incidence, and the traditional vertical incidence was unsuitable for some near-field earthquakes. The oblique incidence should be considered in the seismic analysis of high dams as well as other large-scale water-retaining structures located in seismic regions.

FE Simulating of Torque and Drag inside Borehole of Oil and Gas Wells

2014 ◽  
Vol 1030-1032 ◽  
pp. 781-785
Author(s):  
Yousif E.A. Bagadi ◽  
Abdelwahab M. Fadol ◽  
De Li Gao
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Petroleum Industry ◽  
Drill String ◽  
Friction Torque ◽  
Fe Model ◽  
Analysis Model ◽  
Gas Wells ◽  
Element Analysis ◽  
Oil And Gas Wells

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth. The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. a FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results. The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.

Validation of a 3-Dimensional Finite Element Analysis Model of Deep Water Steel Tube Umbilical in Combined Tension and Cyclic Bending

2009 ◽  
Author(s):  
Vincent Le Corre ◽  
Ian Probyn
Keyword(s):  
Axial Strain ◽  
Steel Tube ◽  
Analytical Models ◽  
Partial Slip ◽  
Analysis Model ◽  
Steel Tubes ◽  
Element Analysis ◽  
Cyclic Bending ◽  
Friction Moment ◽  
Bending Under Tension

This paper focuses upon validation of the 3-D FEA model for cyclic bending under tension load case. An important aspect of accurately modelling the behaviour is the complex stick, partial slip and full slip behaviour of the internal components. Particular attention is paid to the resisting moment resulting from internal friction, known as the friction moment. The effect of increasing tension on the friction moment is studied. The kinematics of sliding are compared to analytical models developed for helically wound structures, such as flexible pipes, and show a very good correlation that confirms the accuracy of the model. Also, the mean axial strain of the steel tubes due to the friction induced by this sliding is highlighted. The hysteretic curves of the axial strain in steel tubes subjected to cyclic bending under tension are derived and validated against full scale experimental data.

Strain Measurements Based Finite Element Model Updating

2011 ◽  
Vol 378-379 ◽  
pp. 98-101
Author(s):  
Yu Xin Zhang ◽  
Zeng Zhong Wang ◽  
Ye Yan Liu
Keyword(s):  
Finite Element ◽  
Model Updating ◽  
Element Model ◽  
Analytical Models ◽  
Design Parameters ◽  
Affine Scaling ◽  
Analysis Model ◽  
Element Analysis ◽  
Actual Structure ◽  
Strain Measurements

Analytical models of the actual structure often differ greatly from their as-built counterparts. Model updating techniques improve the predictions of the behavior of the actual structure by identifying and correcting the uncertain parameters of the analytical model. This paper presents a new model updating technique to improve the finite element analysis model by updating design parameters using strain measurement based on affine scaling interior Algorithm. Static strain measurements are more reliable and realistic than acceleration data in practice. Numerical examples are presented to study the application of the method.

Modeling and experimental verification on directivity of an electret cell array loudspeaker

2012 ◽  
Vol 24 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Yu-Chi Chen ◽  
Wen-Ching Ko ◽  
Han-Lung Chen ◽  
Hsu-Ching Liao ◽  
Wen-Jong Wu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Digital Control System ◽  
Analysis Model ◽  
Cell Array ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Finite Element Analysis ◽  
Directivity Characteristics

We propose a model to give us a method to investigate the characteristic three-dimensional directivity in an arbitrarily configured flexible electret-based loudspeaker. In recent years, novel electret loudspeakers have attracted much interest due to their being lightweight, paper thin, and possessing excellent mid- to high-frequency responses. Increasing or decreasing the directivity of an electret loudspeaker makes it excellent for adoption to many applications, especially for directing sound to a particular area or specific audio location. Herein, we detail a novel electret loudspeaker that possesses various directivities and is based on various structures of spacers instead of having to use multichannel amplifiers and a complicated digital control system. In order to study the directivity of an electret loudspeaker based on an array structure which can be adopted for various applications, the horizontal and vertical polar directivity characteristics as a function of frequency were simulated by a finite-element analysis model. To validate the finite-element analysis model, the beam pattern of the electret loudspeaker was measured in an anechoic room. Both the simulated and experimental results are detailed in this article to validate the various assertions related to the directivity of electret cell-based smart speakers.

scholarly journals Wellbore trajectory control tool seal system leakage analysis based on steady gap flow

2020 ◽  
Vol 12 (6) ◽  
pp. 168781402093046 ◽  
Author(s):  
Lei Shi ◽  
Keqiang Wang ◽  
Ding Feng ◽  
Hong Zhang ◽  
Peng Wang
Keyword(s):  
Prediction Method ◽  
Electronic System ◽  
Contact Length ◽  
Trajectory Control ◽  
Analysis Model ◽  
Rotating Shaft ◽  
Element Analysis ◽  
Gap Flow ◽  
Total Leakage ◽  
Gap Height

Lubricant leakage will inevitably occur during the working process of wellbore trajectory control tools. Even including the lubricant compensation system, serious leakage will still cause lacks lubrication of the internal mechanical structure as well as electronic system damaged by external infiltration fluid, especially when it comes to battery sub and other electronic equipment. Seal system leakage prediction method was presented based on the assumption of steady gap flow. It is assumed that there is a constant gap between the lip seal and the rotating shaft, the gap height is determined by oil film thickness, and the length of the gap was determined by the contact analysis using the Mooney–Rivlin constitutive model. The analysis results show that the contact length between the primary seal lip and the rotary shaft is about 0.1 mm under the condition of ensuring the contact between the deputy seal lip and the rotary shaft. The overall lubricant leakage finite element analysis model was established, and the relationship between the internal lubricant pressure of the tool and the total leakage was obtained. The results of analysis indicate that under the internal pressure of 0.03 MPa, the lubricant leakage is approximately 6 mL/h, which was verified by experiments.

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