Class H Oil Well Cement Hydration at Elevated Temperatures in the Presence of Retarding Agents:  An In Situ High-Energy X-ray Diffraction Study

In this paper, the resistance to H2S attack of pastes made from slag-fly ash blended cement used in oil well (SFAOW) was studied, in which fly ash (FA) was used at replacement dosages of 30% to 60% by weight of slag. Samples of SCOW and SFAOW pastes were demoulded and cured by immersion in fresh water with 2 Mp H2S insulfflation under 130oC for 15 days. After this curing period, compression strength and permeability of the samples were investigated. The reaction mechanisms of H2S with the paste were carried out through a microstructure study, which included the use of x-ray diffraction (XRD) patterns and scanning electron microscope (SEM). Based on the obtained data in this study, incorporation of FA into SCOW results in the comparable effects in the resistance to H2S attack. When the replacement dosage of slag is about 40%, the paste exhibits the best performance on resistance to H2S attack with compression strength 36.58Mp.

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Stress induced phase transformation in Ti60Cu14Ni12Sn4Ta10 nanostructure dendrite composite: In situ high-energy X-ray diffraction study

Materials Letters ◽

10.1016/j.matlet.2016.09.008 ◽

2016 ◽

Vol 185 ◽

pp. 376-379 ◽

Cited By ~ 1

Author(s):

T. Wang ◽

Q.G. Xie ◽

Y.D. Wu ◽

J.J. Si ◽

X.D. Hui ◽

...

Keyword(s):

Phase Transformation ◽

Diffraction Study ◽

High Energy ◽

X Ray Diffraction ◽

X Ray

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In situ high-energy X-ray diffraction study and quantitative phase analysis in the α+γ phase field of titanium aluminides

Scripta Materialia ◽

10.1016/j.scriptamat.2007.08.021 ◽

2007 ◽

Vol 57 (12) ◽

pp. 1145-1148 ◽

Cited By ~ 29

Author(s):

LaReine A. Yeoh ◽

Klaus-Dieter Liss ◽

Arno Bartels ◽

Harald Chladil ◽

Maxim Avdeev ◽

...

Keyword(s):

Diffraction Study ◽

Phase Analysis ◽

Phase Field ◽

Titanium Aluminides ◽

High Energy ◽

Quantitative Phase Analysis ◽

X Ray Diffraction ◽

X Ray ◽

Quantitative Phase

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High-pressure and -temperature spinning capillary cell for in situ synchrotron X-ray powder diffraction

Journal of Synchrotron Radiation ◽

10.1107/s1600577519005150 ◽

2019 ◽

Vol 26 (4) ◽

pp. 1238-1244 ◽

Cited By ~ 1

Author(s):

Edmundo Fraga ◽

Jesus D. Zea-Garcia ◽

Armando Yáñez ◽

Angeles G. De la Torre ◽

Ana Cuesta ◽

...

Keyword(s):

Powder Diffraction ◽

Cost Effective ◽

Oil Well ◽

X Ray Diffraction ◽

High Pressure And Temperature ◽

X Ray ◽

Quantitative Analyses ◽

Well Cement

In situ research of materials under moderate pressures (hundreds of bar) is essential in many scientific fields. These range from gas sorption to chemical and biological processes. One industrially important discipline is the hydration of oil well cements. Existing capillary cells in this pressure range are static as they are easy to design and operate. This is convenient for the study of single-phase materials; however, powder diffraction quantitative analyses for multiphase systems cannot be performed accurately as a good powder average cannot be attained. Here, the design, construction and commissioning of a cost-effective spinning capillary cell for in situ powder X-ray diffraction is reported, for pressures currently up to 200 bar. The design addresses the importance of reducing the stress on the capillary by mechanically synchronizing the applied rotation power and alignment on both sides of the capillary while allowing the displacement of the supports needed to accommodate different capillaries sizes and to insert the sample within the tube. This cell can be utilized for multiple purposes allowing the introduction of gas or liquid from both ends of the capillary. The commissioning is reported for the hydration of a commercial oil well cement at 150 bar and 150°C. The quality of the resulting powder diffraction data has allowed in situ Rietveld quantitative phase analyses for a hydrating cement containing seven crystalline phases.

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In Situ High-Energy X-Ray Diffraction Studies of Melting, Solidification and Solid-State Transformation of Ni3Sn

MRS Advances ◽

10.1557/adv.2020.22 ◽

2020 ◽

Vol 5 (29-30) ◽

pp. 1529-1535 ◽

Cited By ~ 1

Author(s):

Rijie Zhao ◽

Jianrong Gao ◽

Yang Ren

Keyword(s):

Solid State ◽

Elevated Temperatures ◽

High Energy ◽

Cubic Phase ◽

X Ray Diffraction ◽

State Transformation ◽

Solid State Transformation ◽

X Ray ◽

Melting And Solidification

AbstractMelting, solidification and solid-state transformation of the intermetallic Ni3Sn compound were investigated in situ using synchrotron high-energy X-ray diffraction. It was observed that the compound undergoes a hexagonal to cubic transition before melting. In solidification, a disordered cubic phase crystallizes from the liquid at a large undercooling but it is reordered prior to bulk solidification. In melting and solidification, forced or natural flows are active bringing about significant changes of crystal orientations. These in situ observations provided insights into phase transformations of Ni3Sn at elevated temperatures and their roles in formation of metastable microstructure consisting of coarse grains and subgrains.

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