Packed-hole technique

Packed-hole technique Utilizes the hole wall to minimize bending of the bottomhole assembly. 

In mildly corrosive applications it often pays to fabricate the packing support from stainless steel, even when carbon steel is satisfactory for the packing. This prevents localized corrosion that can puncture holes in the support, resulting in downward migration of packings. One service where this technique is commonly applied is in natural gas plant glycol-regeneration stills (84). 

Assemble a reflux apparatus on top of your hot plate using a 20- or 25-mL round-bottom flask and a water-cooled condenser (refer to Technique 7, Figure 7.6A but use a round-bottom flask instead of the conical vial). To control vapors, place a drying tube packed with calcium chloride on top of the condenser. Use a hot plate and the aluminum block with the larger set of holes for heating. 

Fig. 5.66 Reflected light micrograph of polished carbon fiber composites are shown fibers are white, voids (holes) are black, and the resin is gray in color due to surface reflectivity. A section of a graphite fiber reinforced composite (A) shows a complex arrangement of fibers with uniform wetting and packing. Single ply carbon fiber panels (B) embedded in epoxy and polished are uniformly packed. Higher magnification micrographs show detail is possible by this technique for fibers oriented parallel (C) and perpendicular (D) to the polished surface.

It was this commercial market that made the filling operation at Port Hope necessary. To serve private-sector customers, Eldorado had to offer them radium in a form that they could use. The filling lab prepared radium for its primary medical market by packing it in needles, moulds, or tubes in precise quantities. Gradually Errington developed an extensive line of other radium products to serve a wide variety of customer needs. One example was radium-beryllium sources for well-lo ng in the oil business. Companies servicing the mining sector used this technique to determine if there were oil reserves in the vicinity of a dry drill hole. Radium combined with beryllium in the proper ratio produces millions of neutrons a second. This neutron source could be lowered down... 

NSL—often called colloidal lithography (CL)— is an effective technique using self-assemblies of polystyrene (PS) micro- or nano-particles on solid surfaces as 2-or 3-dimensional masks for metal deposition (Zhang et al. 2010). The size and shapes of the close-packed nanospheres and the holes between them, in addition to the metal deposition conditions, such as evaporation angle or specific deposition technique (e.g., sputtering, thermal deposition), influence the achieved metallic patterns. A different kinds of metallic nanostructures can he obtained (Fig. 3.10) ... 

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