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Transport of particle suspensions in oil reservoirs is an essential phenomenon in many oil industry processes. Solid and liquid particles dispersed in the drilling fluid (mud) are trapped by the rock (porous medium) and permeability decline takes place during drilling fluid invasion into reservoir resulting in formation damage. The formation damage due to mud filtration is explained by erosion of external filter cake. Nevertheless, the stabilization is observed in core floods, which demonstrates internal erosion. A new mathematical model for detachment of particles is based on mechanical equilibrium of a particle positioned on the internal cake or matrix surface in the pore space. In the current work the analytical solution obtained to mud filtration with one particle capture mechanism with damage stabilization. The particle torque equilibrium is determined by the dimensionless ratio between the drag and normal forces acting on the particle. The maximum retention function of the dimensionless ratio closes system of governing equations for colloid transport through porous medium.
The man’s action, thanks to its creative capacities, gave a new order to the reality: the “created reality” does not present simply a different order, but is an authentic transformation. Which criteria had directed this transformation? Which will be the criteria of future transformation? The paper presents two possible ideas about creativity and argues in favor of a creative action educated and directed by an ethical criteria.
In order to examine the emotional and
cognitive processes experienced by adolescents with learning disabilities (LD), twenty tenth grade Israeli
students were studied over three years. Data gathered through in-depth
interviews underwent an
axial-coding process, and a grounded theory model was constructed. The findings
revealed various coping styles adopted by students throughout the process of
accepting the disability. Participants were asked to use figurative language to
describe their method of coping with the disability. Participants’ choice of
phrase, metaphor or image characterized the phase of their acceptance as well
as their coping style. This can be served as an effective tool of detection.
Identifying the stage of students’ acceptance and their coping style may
promote optimal treatment for students with LD.
Organizations are seeing the value in comprehensive strategic planning as a result of economic difficulties and the need to become more innovative and viable. The relationship that an organization creates with its customers is the key to its ultimate survival and success. The strategies and tools discussed in this paper provide an overview of what the literature has proven to be some of the most effective ones in today’s competitive environment.