An Investigation of the Effects of High Temperature and High Pressure (HTHP) On the Stability of Wellbore Casing Using Finite Element (FE) Method

2015 ◽  
Author(s):  
S. O Ohenzuwa ◽  
A. O Olafuyi ◽  
E. Nwankwo ◽  
K. O Bello
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
High Temperature ◽  
Fe Method ◽  
The Stability

scholarly journals SUPG Approximation for the Oseen Viscoelastic Fluid Flow with Stabilized Lowest-Equal Order Mixed Finite Element Method

Mathematics ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 128
Author(s):  
Shahid Hussain ◽  
Afshan Batool ◽  
Md. Al Mahbub ◽  
Nasrin Nasu ◽  
Jiaping Yu
Keyword(s):  
Finite Element ◽  
Fluid Flow ◽  
Viscoelastic Fluid ◽  
Mixed Finite Element ◽  
Mixed Finite Element Method ◽  
Constitutive Law ◽  
Optimal Error Estimates ◽  
Fe Method ◽  
The Stability ◽  
Stability And Accuracy

In this article, a stabilized mixed finite element (FE) method for the Oseen viscoelastic fluid flow (OVFF) obeying an Oldroyd-B type constitutive law is proposed and investigated by using the Streamline Upwind Petrov–Galerkin (SUPG) method. To find the approximate solution of velocity, pressure and stress tensor, we choose lowest-equal order FE triples P 1 - P 1 - P 1 , respectively. However, it is well known that these elements do not fulfill the i n f - s u p condition. Due to the violation of the main stability condition for mixed FE method, the system becomes unstable. To overcome this difficulty, a standard stabilization term is added in finite element variational formulation. The technique is applied herein possesses attractive features, such as parameter-free, flexible in computation and does not require any higher-order derivatives. The stability analysis and optimal error estimates are obtained. Three benchmark numerical tests are carried out to assess the stability and accuracy of the stabilized lowest-equal order feature of the OVFF.

The stability study of CO 2 foams at high pressure and high temperature

2017 ◽  
Vol 154 ◽  
pp. 234-243 ◽  
Author(s):  
Yanqing Wang ◽  
Yang Zhang ◽  
Yanmin Liu ◽  
Liang Zhang ◽  
Shaoran Ren ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Stability Study ◽  
The Stability

Experimental and theoretical investigation of the stability of the monoclinicBaWO4-II phase at high pressure and high temperature

2010 ◽  
Vol 81 (14) ◽  
Author(s):  
R. Lacomba-Perales ◽  
D. Martinez-García ◽  
D. Errandonea ◽  
Y. Le Godec ◽  
J. Philippe ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Theoretical Investigation ◽  
The Stability

Life Prediction of the Tapered Pipe With High Temperature and High Pressure by Finite Element Methods

2007 ◽  
Author(s):  
Juntao Bao ◽  
Jianming Gong ◽  
Shantung Tu ◽  
Yuesheng Li ◽  
Yanfei Qiu
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
High Temperature ◽  
Internal Pressure ◽  
Creep Damage ◽  
Piping System ◽  
Bending Moments ◽  
Finite Element Program ◽  
Element Program ◽  
Main Steam

Tapered pipe used in the main steam pipelines, which operated at high temperature and high pressure, including concentric tapered pipe and eccentric tapered pipe, they are sources of weakness in the piping system serviced in the power stations and the chemical plants, and creep is the significant reason that caused their failure. Creep damage analyses are carried out for these two kinds of tapered pipes by introducing user subroutine based on the modified Karchanov-Rabotnov constitutive equations into finite element program ABAQUS, then the effects of bending moments and internal pressure to the serviced life of the components are investigated by comparing four group of calculated results under different loads, the results indicated that eccentric tapered pipe is more inclinable to broken than concentric tapered pipe under the same conditions, so it is not recommended to use the eccentric tapered pipe in the piping system. The bending moments will accelerate the components’ failure, so it is necessary to take some advantages to reduce the bending moments near the tapered pipe, on the other hand, the life of the tapered pipe will decrease quickly with the internal pressure increasing, so the control of the operated pressure is important to ensure the serviced life of the pipelines.

scholarly journals Effect of mono and diglyceride of medium chain fatty acid on the stability of flavour emulsion

Food Research ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 214-220 ◽  
Author(s):  
H. Jadhav ◽  
J. Waghmare ◽  
U. Annapure
Keyword(s):  
High Pressure ◽  
Fatty Acid ◽  
High Temperature ◽  
Chain Fatty Acid ◽  
Medium Chain Fatty Acid ◽  
Water Phase ◽  
Bakery Products ◽  
Medium Chain ◽  
High Pressure Homogenizer ◽  
The Stability

Flavour emulsion is used in a wide range of food products including carbonated beverages, dairy products, confectionaries, and bakery products. Among its food applications are extensive uses in bakery products due to its high heat resistant properties. In flavour emulsion flavour oil is suspended in water phase and this water phase retains flavour even if such flavour emulsion is used for high temperature food application like baking. But flavour extracts are made by suspending flavour oil in alcohol. So, such flavour extracts are not suitable for high temperature food processing, since alcohol evaporates at high temperature. Thus, flavour emulsion is much better than flavour extracts. The stability of flavour emulsion depends on the emulsifier used in making flavour emulsion. Monocaprylin and dicaprylin are mono and diglyceride of mediumchain fatty acids having very good emulsifying properties. The stability of flavour emulsion can be improved by making use of mono and diglyceride as an emulsifier. The present study focused on the development of stable flavour emulsion from fruit waste using mono and diglyceride of medium-chain fatty acid as an emulsifier. The stable flavour emulsion is made from orange oil, water and emulsifier using ultra high-pressure homogenizer with 25 MPa pressure. Emulsifier mono and dicaprylin were synthesized by the esterification reaction between glycerol and caprylic acid. The effect of various combination of mono and dicaprylin is studied on the formation of stable flavour emulsion. The higher monocaprylin content in the emulsifier combination showed excellent results and a good synergistic effect on the stability of the emulsion. The combination of mono: diglyceride which resulted in the formation of stable flavour emulsion is 80:20 at 10% concentration, 2 passes and 25 mPa pressure in a high-pressure homogenizer. The stability of flavour emulsion was investigated using a storage study. The emulsion was found to be stable for 30 days at ambient temperature (25ºC) and refrigeration temperature (4ºC) but showed low stability at 50ºC.

scholarly journals Enhancing the Stability of Invert Emulsion Drilling Fluid for Drilling in High-Pressure High-Temperature Conditions

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2393 ◽  
Author(s):  
Salaheldin Elkatatny
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Rheological Properties ◽  
Drilling Fluid ◽  
Electrical Stability ◽  
Dynamic Conditions ◽  
High Pressure High Temperature ◽  
Invert Emulsion ◽  
The Stability ◽  
Filtration Properties

Drilling in high-pressure high-temperature (HPHT) conditions is a challenging task. The drilling fluid should be designed to provide high density and stable rheological properties. Barite is the most common weighting material used to adjust the required fluid density. Barite settling, or sag, is a common issue in drilling HPHT wells. Barite sagging may cause many problems such as density variations, well-control problems, stuck pipe, downhole drilling fluid losses, or induced wellbore instability. This study assesses the effect of using a new copolymer (based on styrene and acrylic monomers) on the rheological properties and the stability of an invert emulsion drilling fluid, which can be used to drill HPHT wells. The main goal is to prevent the barite sagging issue, which is common in drilling HPHT wells. A sag test was performed under static (vertical and 45° incline) and dynamic conditions in order to evaluate the copolymer’s ability to enhance the suspension properties of the drilling fluid. In addition, the effect of this copolymer on the filtration properties was performed. The obtained results showed that adding the new copolymer with 1 lb/bbl concentration has no effect on the density and electrical stability. The sag issue was eliminated by adding 1 lb/bbl of the copolymer to the invert emulsion drilling fluid at a temperature >300 °F under static and dynamic conditions. Adding the copolymer enhanced the storage modulus by 290% and the gel strength by 50%, which demonstrated the power of the new copolymer to prevent the settling of the barite particles at a higher temperature. The 1 lb/bbl copolymer’s concentration reduced the filter cake thickness by 40% at 400 °F, which indicates the prevention of barite settling at high temperature.

High pressure–high temperature investigation of the stability of nitride spinels in the systems Si3N4–Ge3N4

2001 ◽  
Vol 120 (5-6) ◽  
pp. 237-242 ◽  
Author(s):  
Emmanuel Soignard ◽  
Maddury Somayazulu ◽  
Ho-Kwang Mao ◽  
Jianjun Dong ◽  
Otto F. Sankey ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Pressure High Temperature ◽  
The Stability
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