Elastic properties of forsterite at high pressure obtained from the high-temperature database

1998 ◽  
pp. 345-355 ◽  
Author(s):  
Hyunchae Cynn ◽  
Donald G. Isaak ◽  
Orson L. Anderson
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Elastic Properties

Elastic Properties of High Temperature Superconductors Derived from High Pressure Experiments

1991 ◽  
pp. 433-455 ◽  
Author(s):  
W. H. Fietz ◽  
H. A. Ludwig ◽  
B. P. Wagner ◽  
K. Grube ◽  
R. Benischke ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Elastic Properties ◽  
High Temperature Superconductors

scholarly journals Isobaric Study of the Elastic Properties for Alkaline Earth Oxides under High Temperature

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Seema Gupta ◽  
S. P. Singh ◽  
S. C. Goyal
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Elastic Properties ◽  
Alkaline Earth ◽  
Effect Of Temperature ◽  
High Pressure High Temperature ◽  
Anharmonic Term ◽  
Logarithmic Series ◽  
Temperature Equation ◽  
Good Agreement

A simple and straightforward theoretical model is developed to investigate the elastic properties of alkaline earth oxides under the effect of temperature as well as pressure. The calculation is performed with the help of high pressure-high temperature equation of state based on thermodynamic analysis. The anharmonic term arising due to thermal expansion has been taken into account in the expansion of logarithmic series of the thermodynamic data. The results obtained for alkaline earth oxides are discussed and compared with experimental data under the combined effect of high temperature and high pressure. The results are found to be in good agreement with available experimental results.

Optimal Synthesis, Characterization, and Performance Evaluation of High-Pressure High-Temperature Polymer-Based Drilling Fluid: The Effect of Viscoelasticity on Cutting Transport, Filtration Loss, and Lubricity

SPE Journal ◽  
2020 ◽  
Vol 25 (03) ◽  
pp. 1333-1350 ◽  
Author(s):  
Sidharth Gautam ◽  
Chandan Guria
Keyword(s):  
Thermal Stability ◽  
High Pressure ◽  
High Temperature ◽  
Elastic Properties ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Hole Cleaning ◽  
Grafted Copolymer ◽  
Filtration Loss ◽  
The Stability

Summary Viscoelasticity plays a significant role in improving the performance of the drilling fluid by manipulating its elastic properties. An appropriate value of the first normal stress difference (N1), extensional viscosity (ηe), and relaxation time (θ) enhance the cutting transportability, hole-cleaning ability, filtration loss, and lubrication behavior. However, the performance of the drilling fluid deteriorates during the drilling of high-pressure and high-temperature (HPHT) wells under acid gas and salt(s) contamination. Therefore, it is a challenging task to synthesize a thermally and rheologically stable drilling fluid, which is acid as well as salt(s) resistant, and maintain its desired properties. Although several water-soluble synthetic polymer-based drilling fluids have been used widely for the drilling of HPHT wells, most of these are limited at less than 200°C. Polyanionic cellulose (PAC) has an excellent heat-resistant stability, salt tolerance, calcium and magnesium resistant, and strong antibacterial activity, and it exhibits exceptional filtration and rheological behavior under HPHT conditions. However, using PAC beyond 200°C is limited because of the presence of the biodegradable cellulose units in it. To use the extraordinary properties of PAC, it is aimed to increase the thermal stability of PAC through appropriate modification. In this study, PAC-grafted copolymers involving acrylamide (a salt-tolerant viscosifying agent), 2-acrylamide-2-methyl-1-propane sulfonic acid (a thermally stable lubricating and fluid-loss control agent), and sodium 4-styrene sulfonate (a high-temperature deflocculant) is synthesized optimally through maximizing the thermal degradation stability of the grafted copolymer and minimizing the filtration loss as well as the coefficient of friction (CoF) of the drilling fluid simultaneously. Optimally synthesized PAC-grafted copolymers are then used to prepare water-based mud (WBM) involving American Petroleum Institute (API)-grade bentonite and alpha-glycol functionalized nano fly ash, and the tests for steady shear viscosity and viscoelasticity are performed to determine the rheological stability of mud beyond 200°C. The amplitude sweep tests for viscoelasticity are performed to determine the linear viscoelasticity range (LVR), structural stability, gel strength, and dynamic yield point (YP), whereas frequency, time, and temperature sweep tests are performed to obtain the elastic modulus (G′), viscous modulus (G″), and complex viscosity under HPHT conditions to check the stability of the drilling fluids under different holding times. Dynamic and static aging tests of the developed drilling fluids are performed at elevated temperature and pressure, and the aged muds are tested by evaluating the rheology, frictional, and filtration-loss behavior as per the API recommended procedure. The stability of the aged muds is also tested by evaluating the N1, ηe, and θ using a cone and plate rheometer. The performance of the proposed drilling fluids is also tested under acidic, sodium chloride (NaCl), and calcium chloride (CaCl2) environments at HPHT bottomhole conditions. The experimental results under HPHT conditions reveal that the performance of the mud (i.e., thermal stability, cutting transportability, hole-cleaning ability, filtration loss, and lubrication behavior) could be considerably improved by increasing the elastic properties of the drilling fluid by manipulating the molecular weight of the proposed PAC-grafted copolymer. Finally, the environmental effect of the developed muds is evaluated by finding the lethal concentration that kills 50% of the shrimp population (i.e., LC50) and the Hg and Cd contamination, and they are found to be environmentally safe.

Elastic properties of nanocrystalline forsterite under high pressure and high temperature

2013 ◽  
Vol 113 (3) ◽  
pp. 741-745 ◽  
Author(s):  
Kuldeep Kholiya ◽  
Jeewan Chandra
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Elastic Properties

Structural and elastic properties of KBr at high pressure and high temperature

2017 ◽  
Vol 90 (10) ◽  
pp. 955-963 ◽  
Author(s):  
Shilpa Kapoor ◽  
Atul Gour ◽  
Sadhna Singh
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Elastic Properties

Microstructural Study of Diamond Deformed Under High Pressure and Temperature

1985 ◽  
Vol 43 ◽  
pp. 230-231
Author(s):  
E. F. Koch
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Lattice Structure ◽  
Diamond Particle ◽  
Polycrystalline Diamond ◽  
Sintering Process ◽  
Ion Milling ◽  
Sintered Compact ◽  
Transmission Electron ◽  
High Pressure Sintering

Because of the extremely rigid lattice structure of diamond, generating new dislocations or moving existing dislocations in diamond by applying mechanical stress at ambient temperature is very difficult. Analysis of portions of diamonds deformed under bending stress at elevated temperature has shown that diamond deforms plastically under suitable conditions and that its primary slip systems are on the ﹛111﹜ planes. Plastic deformation in diamond is more commonly observed during the high temperature - high pressure sintering process used to make diamond compacts. The pressure and temperature conditions in the sintering presses are sufficiently high that many diamond grains in the sintered compact show deformed microtructures.In this report commercially available polycrystalline diamond discs for rock cutting applications were analyzed to study the deformation substructures in the diamond grains using transmission electron microscopy. An individual diamond particle can be plastically deformed in a high pressure apparatus at high temperature, but it is nearly impossible to prepare such a particle for TEM observation, since any medium in which the diamond is mounted wears away faster than the diamond during ion milling and the diamond is lost.

Sign in / Sign up

Export Citation Format

Share Document