Study of dynamic pressure on the packer for deep-water perforation

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 215-223
Author(s):  
Hao Huang ◽  
Qiao Deng ◽  
Hui Zhang
Keyword(s):  
Deep Water ◽  
Peak Pressure ◽  
Orthogonal Design ◽  
Dynamic Pressure ◽  
Three Dimensional ◽  
Calculation Model ◽  
Well Testing ◽  
Technical Problems ◽  
Wellbore Pressure ◽  
Three Dimensional Finite Element

Abstract The packer is one of the most important tools in deep-water perforation combined well testing, and its safety directly determines the success of perforation test operations. The study of dynamic perforating pressure on the packer is one of the key technical problems in the production of deep-water wells. However, there are few studies on the safety of packers with shock loads. In this article, the three-dimensional finite element models of downhole perforation have been established, and a series of numerical simulations are carried out by using orthogonal design. The relationship between the perforating peak pressure on the packer with the factors such as perforating charge quantity, wellbore pressure, perforating explosion volume, formation pressure, and elastic modulus is established. Meanwhile, the database is established based on the results of numerical simulation, and the calculation model of peak pressure on the packer during perforating is obtained by considering the reflection and transmission of shock waves on the packer. The results of this study have been applied in the field case of deep-water well, and the safety optimization program for deep-water downhole perforation safety has been put forward. This study provides important theoretical guidance for the safety of the packer during deep-water perforating.

An Experimental Study of Soft Rock Roadway with Anchored Support Structure Based on Nested Mechanical Analysis Model

2011 ◽  
Vol 90-93 ◽  
pp. 277-283
Author(s):  
Fu Sheng Liu ◽  
Gang Gang Dong ◽  
Su Hua Wang ◽  
Shao Jie Wang ◽  
Yang Song
Keyword(s):  
Design Method ◽  
Dynamic Pressure ◽  
Three Dimensional ◽  
Soft Rock ◽  
Mechanical Analysis ◽  
Analysis Model ◽  
Support Structure ◽  
Three Dimensional Finite Element ◽  
Soft Rock Roadway ◽  
Rock Roadway

This paper chooses anchored support engineering of ore dynamic pressure soft rock roadway Qinan, Huaibei city as an example, and with the help of nested mechanical analysis model of anchored support structure, the paper analyzes the range of elastoplasticity, the range of anchor note area, stress and displacement of original rocks of the reinforced project, and simulates three-dimensional finite element numerical and underwent engineering detection of the project. Practicality and validity of quantitative control design method of anchored support structure are proved by comparing the theoretic research, calculation results, and field measurement results.

3D Numerical Simulation on Failure of Cement Sheath of Macondo Well-#1 in Deep Water Gulf of Mexico

2014 ◽  
Vol 1044-1045 ◽  
pp. 197-204
Author(s):  
Xin Pu Shen ◽  
Xiao Chun Wang
Keyword(s):  
Gulf Of Mexico ◽  
Pore Pressure ◽  
Deep Water ◽  
Three Dimensional ◽  
Interface Element ◽  
Interface Elements ◽  
Setting Process ◽  
Dimensional Finite Element ◽  
Cement Sheath ◽  
Three Dimensional Finite Element

Aim of this work is to provide a quantitative solution which clarifies the integrity of cement sheath under given underground environmental conditions at bottom section of Macondo well #1 in deep water Gulf of Mexico. With three-dimensional Finite Element Method, mechanical behavior of the model for Macondo #1 well has been investigated, with particular concerns on continuum damage variable and pore pressure distribution within interface element. Quantitative results are obtained for distribution of mechanical variables. Principal conclusions are: 1) With regular properties of cement material, it is shown that the integrity of cement ring is good, no damage could occur within interface elements, and consequently no oil could escape through cement ring. 2) With poor mechanical properties of weak cement, which could be true because of disturbance occurred in its setting process, there are two damage bands existing within interface elements. These two damage bands form two channels at where values of pore pressure are obviously higher than that its neighboring matrix. These phenomena indicate that oil could escape through these interface elements.

Research on Tuned Mass Damper for Vibration Control of Tower under Multi-Dimensional Seismic Excitations

2013 ◽  
Vol 353-356 ◽  
pp. 2181-2186
Author(s):  
Yu Wei Dai ◽  
Chao Liu ◽  
Wen Feng Li ◽  
Li Tian
Keyword(s):  
Vibration Control ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Engineering Application ◽  
Element Model ◽  
Tuned Mass Damper ◽  
Calculation Model ◽  
Seismic Excitations ◽  
Mass Damper ◽  
Three Dimensional Finite Element

The tuned mass damper (TMD) for vibration control of tower subjected to multi-dimensional seismic excitations is studied in this paper. Calculation model of the tuned mass damper is introduced, and the equations of motion of a tower with tuned mass damper are derived, and the calculation parameters of the tuned mass damper are given based on the control structure. According to a practical engineering, the three-dimensional finite element model of a tower is established using SAP2000. Three typical seismic records are selected according the code of seismic design. Vibration control for tower model with tuned mass damper under multi-dimensional seismic excitations is performed by using numerical simulation. The maximum responses of displacement and axial force of the tower structure without and with TMD are obtained. The results show that the TMD could decrease the responses of the tower in three directions, and the tower with TMD can be a reference for tower practice engineering application.

Effect of casing eccentricity on cement sheath integrity

2018 ◽  
Vol 58 (2) ◽  
pp. 669
Author(s):  
Elaheh Arjomand ◽  
Terry Bennett
Keyword(s):  
Three Dimensional ◽  
Surrounding Environment ◽  
High Magnitude ◽  
Wellbore Pressure ◽  
Dimensional Finite Element ◽  
Concrete Damage ◽  
Zonal Isolation ◽  
Cement Sheath ◽  
Three Dimensional Finite Element ◽  
Tensile Damage

Cement sheaths play an important role in providing zonal isolation and preventing the migration of formation fluids to aquifers and the surrounding environment. The condition of a cement sheath may change because of the imposed pressure and temperature alterations during a wellbore lifetime. Cement sheath mechanical failure may happen because of poor cement placement, development of cracks within the cement sheath and debonding at the cement sheath, casing and rock interfaces. A three-dimensional finite element framework, employing an appropriate constitutive model (Concrete Damage Plasticity, CDP) for cement sheath and a surface-based cohesive behaviour for the interfaces, is developed for integrity investigations. The incorporation of the CDP is very advantageous to model quasi-brittle materials due to its capabilities to simulate both compression and tensile damage. The effect of casing eccentricity on stress distribution within the cement sheath and the integrity of the cement sheath is investigated while enhancing the wellbore pressure. Three different degrees of casing eccentricity (30%, 50% and 70%) were considered. The huge stress concertation within the narrower part of the cement sheath makes this section susceptible to compression and tensile damage. The high magnitude of compression and tensile damage in the scenario with 70% casing eccentricity highlights the importance cement sheath centralisation.

The Analysis of Dynamic Characteristics for the Powerhouse Structure of the Riverbed-Hydroelectric Station

2012 ◽  
Vol 226-228 ◽  
pp. 1285-1288
Author(s):  
Xuan Mao Peng ◽  
Zheng Xiang Song ◽  
Lin Jiang
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Dynamic Stress ◽  
Three Dimensional ◽  
Hydroelectric Station ◽  
Element Model ◽  
Calculation Model ◽  
Dimensional Finite Element ◽  
Hanjiang River ◽  
Three Dimensional Finite Element

The paper creates a three-dimensional finite element model with the Xihe Project on the Hanjiang River as a background. The space integrated finite element method is applied to analyze the dynamic characteristics of the spatial structure of the riverbed-hydroelectric station. The aim is to calculate and analyze the free vibration characteristics of the whole structure, the dynamic displacement and the dynamic stress under the two typical conditions. The calculation model is effective to consider the interaction of the upstream dam section, the main and auxiliary powerhouse and the downstream water retaining structure, as well as the foundation. The results obtained will be a valuable reference for optimizing the dynamic characteristics of the powerhouse structure of riverbed-hydroelectric station and improving the engineering design.

A Cutting Concentration Calculation Model of a Vertical Wellbore Annulus in Deep-Water Drilling Operation and its Application

2011 ◽  
Vol 101-102 ◽  
pp. 311-314
Author(s):  
Huan Yu Xia ◽  
Ying Hu Zhai ◽  
Xu Zhang
Keyword(s):  
Deep Water ◽  
Large Diameter ◽  
Calculation Model ◽  
Oil Field ◽  
Good Effect ◽  
Drilling Operation ◽  
Wellbore Pressure ◽  
Water Well ◽  
Key Parameter

Cutting transport is a big problem in a wellbore in deep-water drilling specially with a long and large diameter riser. And proper cutting concentration is the key parameter of controlling wellbore pressure and ECD. In this study, a cutting concentration model of a vertical wellbore annulus in deep-water drilling operation has been developed. The model is solved numerically to predict the proportion respectively in each interval of the deep-water well and the rule of proportion changed with time. It is applied in the calculation of cutting concentration in the oil field and a good effect has been achieved.

scholarly journals Study on Stability of Shield Tunnel Excavation Face in Soil-Rock Composite Stratum

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Hongtao Sui ◽  
Chao Ma ◽  
Chunquan Dai ◽  
Tingzhi Yang
Keyword(s):  
Limit Equilibrium ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Calculation Model ◽  
Shield Tunnel ◽  
Support Pressure ◽  
Finite Element Software ◽  
Dimensional Finite Element ◽  
Practical Engineering ◽  
Three Dimensional Finite Element

In order to study the instability mode of shield excavation face in soil-rock composite stratum and determine the ultimate support pressure of excavation face, this paper selects two typical soil-rock composite strata and uses three-dimensional finite element software to study the failure development process of shield excavation face. Based on the principle of limit equilibrium, a calculation model of limit support pressure for soil-rock composite stratum is proposed and applied to practical engineering. It is found that the shape of “unloading loosening zone” is mainly determined by the properties of upper soil and the properties of lower rock mainly determine the scope and shape of “sliding instability zone.” With the increase of soil proportion coefficient, the ultimate bearing capacity increases nonlinearly and the growth rate decreases gradually. At the same time, the influence of overlying Earth pressure and soil cohesion cannot be ignored.

scholarly journals The research into the propagation law of the shock wave of a gas explosion inside a building

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Shu-Chao Lin ◽  
You-Chun Xu ◽  
Pei-Dong Yang ◽  
Shan Gao ◽  
Yi-Jun Zhou ◽  
...  
Keyword(s):  
Shock Wave ◽  
Peak Pressure ◽  
Initial Conditions ◽  
Three Dimensional ◽  
Time History ◽  
Element Model ◽  
Space Distribution ◽  
Gas Explosion ◽  
Propagation Law ◽  
Three Dimensional Finite Element

Based on the dissipation rate conservation equations of turbulent kinetic energy in the k-ε turbulence model, a complicated three-dimensional finite element model of a kitchen filled with gas mixture is developed by using the open source field operation and manipulation (OpenFOAM). Two representative kitchens were used to investigate the propagation law of the shock wave of a gas explosion inside a building by considering the key characteristics of the blast shock wave. The influence of some crucial parameters, such as initial conditions and kitchen parameters, on the properties of the blast shock wave is investigated. The basic steps to predict the peak pressure of the blast shock wave are given in consideration of the initial condition and the kitchen whilst the injury effect of the blast shock wave on the humans and animals is evaluated. The research results indicate that the pressure time history and the peak pressure space distribution are greatly influenced by the kitchen design layout. The coupled interaction between the initial temperature and gas volume concentration, especially at the upper and lower explosion limits of the gas, significantly affects the peak pressure. The peak pressure varies significantly with the opening and the buffer; however, it has little relation with the width, length, and height of the kitchen. The proposed method can accurately and effectively predict the peak pressure of the blast shock wave inside buildings. In terms of the peak pressure space distribution of the explosion shock wave, the peak pressure is much higher than the threshold of the killing pressure, which is unsafe for the humans and animals in the building.

Strength and Fatigue Analysis of Tube-Sheet Subjected to Thermal Shock

2016 ◽  
Author(s):  
Jun Shen ◽  
Yanfang Tang ◽  
Juncheng Xu ◽  
Yinghua Liu
Keyword(s):  
Finite Element ◽  
Thermal Shock ◽  
Three Dimensional ◽  
Element Model ◽  
Calculation Model ◽  
Stress Profile ◽  
Tube Sheet ◽  
Mechanical Coupling ◽  
Time Points ◽  
Three Dimensional Finite Element

A calculation model for a tube-sheet under thermal shock loading with the finite element code ANSYS is established in this paper. A three-dimensional finite element model is established to simulate thermal shock process in order to obtain temperature and stress distributions of the structure. The duration time of the thermal shock is taken as about ten seconds and thermal cycling numbers are more than 1000 times for the whole service life of the structure. In order to capture accurate temperature and stress profile of this structure, thermo-mechanical coupling approach and transient thermal analysis is used. Temperature and stress distribution are obtained under the given thermal boundary conditions at different time points and it is also easy to get the stress amplitude of the other points in this structure between any two time points. According to the numerical results, the stress induced by thermal shock changes with time and its magnitude and amplitude cannot be ignored. Strength and fatigue evaluations are also performed according to ASME VIII-2 to ensure its safety.

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