Holographic topological defects and local gauge symmetry: clusters of strongly coupled equal-sign vortices

Gauge invariance plays an important role in forming topological defects. In this work, from the AdS/CFT correspondence, we realize the clusters of equal-sign vortices during the course of critical dynamics of a strongly coupled superconductor. This is the first time to achieve the equal-sign vortex clusters in strongly coupled systems. The appearance of clusters of equal-sign vortices is a typical character of flux trapping mechanism, distinct from Kibble-Zurek mechanism which merely presents vortex-antivortex pair distributions resulting from global symmetry breaking. Numerical results of spatial correlations and net fluxes of the equal-sign vortex clusters quantitatively support the positive correlations between vortices. The linear dependence between the vortex number and the amplitude of magnetic field at the ‘trapping’ time demonstrates the flux trapping mechanism very well.

The lattice dislocation trapping mechanism at the ferrite/cementite interface in the Isaichev orientation relationship

We analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface of the Isaichev orientation relationship by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis. We find that the lattice dislocation trapping ability is varied by initial position of the lattice dislocation. The lattice dislocation near the interface is attracted to the interface by the image force generated by the interface shear, while the lattice dislocation located far is either attracted to or repelled from the interface, or even oscillates around the introduced position, depending on the combination of the stress field induced by the misfit dislocation array and the image stress field induced by the lattice dislocation.

The Lattice Dislocation Trapping Mechanism at the Ferrite/Cementite Interface: The Isaichev Orientation Relationship

We analyze the lattice dislocation trapping mechanism at the ferrite/cementite interface (FCI) of the Isaichev orientation relationship (OR) by atomistic simulations combined with the anisotropic linear elasticity theory and disregistry analysis. We find that the lattice dislocation trapping ability is varied by initial position of the lattice dislocation. The lattice dislocation near the interface is attracted to the interface by the image force generated by the interface shear, while the lattice dislocation located far is either attracted to or repelled from the interface, or even oscillates around the introduced position, depending on the combination of the stress field induced by the misfit dislocation array and the image stress field induced by the lattice dislocation.

The Importance of Identifying the Evidence of Hydrodynamic Trapping for New Well Placement in Mature Offshore Stupa Field

To predict the hydrocarbon limit and new well placement for future development in the mature Stupa field, hydrodynamic trapping analysis is carried out to find a solution of “tilted” contact hypothesis. The static and dynamic data of 6 exploration wells and 12 development wells were used to recognize the evidence of hydrodynamic trapping. There are multiple pieces of such evidence for hydrodynamic trapping such as variation in fluid contacts, lateral reservoirs drainage and variation of water pseudo potential. This paper will describe identification of tilted gas – water contacts related to hydrodynamic trapping mechanism plays, to predict and map the tilted contact using “u” map as a limit of the field and how a tilted gas-water contacts map leads for opportunity to identify future well development. It is concluded that the hydrodynamic trapping is working in the Stupa field. A new limit of hydrocarbon accumulation as a result of tilted contact mapping using “U” map has significantly changed the field development strategy in the Stupa field. The West Stupa Panel has now become the new target location of future field development for prolonging the production life of the mature Stupa field. At the end of 2019, one development well was drilled at the north flank of West Stupa Panel and showed very good results, which unlocked the remaining gas potential of this panel. Following this positive result, 3 other wells are proposed to develop the remaining stakes in this panel. Identifying the evidence of hydrodynamic trapping and mapping the tilted gas – water contacts had opened new opportunities for further field development in flank areas of the mature gas Stupa field.