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Apparatus and methods for use in completing a subterranean zone penetrated by a wellbore include a tubular member having a first segment and a second segment, each segment containing a longitudinal bore. The tubular member forms an annulus between itself and the wellbore wall. At least one screen me

Apparatus and methods for use in completing a subterranean zone penetrated by a wellbore include a tubular member having a first segment and a second segment, each segment containing a longitudinal bore. The tubular member forms an annulus between itself and the wellbore wall. At least one screen member at least partially encloses and is coupled to a second segment of the tubular member. The screen member and the enclosed second segment of the tubular member both have openings that allow fluid communication between the longitudinal bore of the tubular member and the wellbore. The apparatus includes an alternate flowpath member having a wall, upper and lower ends, and at least one aperture in its wall. The apertures are small enough to substantially prevent passage of particulate material. The alternate flowpath member extends longitudinally along a portion of the wellbore and creates a communication path for fluid flow.

대표청구항 ▼

Apparatus and methods for use in completing a subterranean zone penetrated by a wellbore include a tubular member having a first segment and a second segment, each segment containing a longitudinal bore. The tubular member forms an annulus between itself and the wellbore wall. At least one screen me

Apparatus and methods for use in completing a subterranean zone penetrated by a wellbore include a tubular member having a first segment and a second segment, each segment containing a longitudinal bore. The tubular member forms an annulus between itself and the wellbore wall. At least one screen member at least partially encloses and is coupled to a second segment of the tubular member. The screen member and the enclosed second segment of the tubular member both have openings that allow fluid communication between the longitudinal bore of the tubular member and the wellbore. The apparatus includes an alternate flowpath member having a wall, upper and lower ends, and at least one aperture in its wall. The apertures are small enough to substantially prevent passage of particulate material. The alternate flowpath member extends longitudinally along a portion of the wellbore and creates a communication path for fluid flow. according to claim 6, wherein the peripheral wall of said second duct is provided with incisions in its top portion which have a predetermined axial length L. 9. The device according to claim 6, wherein the peripheral wall of said second duct comprises four plates connected together along respective longitudinal edges. 10. A method for continuous casting of metallic products using a continuous casting device comprising a funnel and a crystallizer positioned below the funnel, which define a channel for passage of a molten material, comprising the following steps: a) providing first coils to externally surround the funnel; b) providing at least one second coil positioned between the lower extremity of the funnel and the upper extremity of the crystallizer; c) pouring the molten material continuously into the funnel by means of injection until a level covering an outlet mouth of the injection means is reached; d) forming a protective layer of dross on the top surface of the molten material; e) feeding the plurality of electromagnetic coils with alternating current, thus generating a longitudinal magnetic flux inside a portion of the channel filled with molten material in correspondence with the funnel and of a triple point junction thereby detaching an outer surface of the molten material from the internal wall of said channel to form a size of free peripheral space at the triple point and along the entire perimeter of the molten material; f) varying selectively the current in the coils for producing vertical oscillations on the crystallizer to maintain the size of the free peripheral space constant at the triple point junction and along the entire perimeter of the molten material during advancement of the molten material along the channel during casting operation and to maintain constant the relative position of the triple point with respect to the metallic product; g) injecting lubricant along the walls of the channel in order to favor sliding of the solidifying skin; and h) extracting the solidified material from the continuous casting device after passing through the crystallizer. 11. The process according to claim 10, wherein said protective layer on the top surface of the molten material is formed with dross or inert gas. 12. The process according to claim 11, wherein the free peripheral space is filled with an inert gas. 13. The process according to claim 11, wherein the free peripheral space is filled with dross. rality of fluid flow pathways including fins. Closure bars associated with each of the layers have a core reinforcing portion. Each core reinforcing portion includes first and second reinforcing members with a modified flow passage between them. The example embodiments include modified flow passages with generally C-shaped cross sections. The reinforcing portions preferably extend toward a center of the heat exchanger core varying distances along the body of the core so that reinforcing material is concentrated near the ends of the core where deformation caused by heat stress is most likely to occur.