An algorithm for switchbox routing, called PACKER, is presented. In an initial phase, the connectivity of each net is established in a fast way without taking the other nets into account. In general this will give rise to conflicts (short circuits). In the second stage the conflicts are removed iteratively using Connectivity preserving local transformations (CPLT’s). They “reshape” a net by dis...

Counterfeit drugs have become a widespread threat to the publics’ health [1]. According to the World Health Organization (WHO) definition, a counterfeit drug is “a medicine which is deliberately and fraudulently mislabeled with respect to identity and/or source. Counterfeiting can apply to both branded and generic products and counterfeit products may include products with the correct ingredien...

This work established a finite element analysis (FEA) model of an inserted tooth-type slip assembly under bear setting load and axial load, calculated the differences between teeth sidetracking packer slip-formed furrow shapes on casing face, analyzed reliability tooth packer. The orthogonal optimization structural parameters was carried out basis effect. Finally, experiment conducted with deve...

[1] We report new drillstring packer permeability tests conducted during Integrated Ocean Drilling Program (IODP) Expedition 327 in upper oceanic basement in Hole U1362A on the eastern flank of the Juan de Fuca Ridge. Hole U1362A lies within a closely spaced array (40–2460 m separation) of six holes in well-sedimented 3.5–3.6 m.y. old crust that were drilled, tested, and instrumented with boreh...

Abstract Nylon cord rubber has the advantages of small residual deformation and is easy to lift lower tubing string in low-permeability oil gas reservoirs. However, it associated with low-pressure resistance poor sealing performance. To enhance performance nylon rubber, a three-dimensional numerical model was established its accuracy experimentally determined. The Plackett–Burman test, Steepest...