E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/08 (2006.01) B01D 29/15 (2006.01)
Patent
CA 2075084
A well screen for a horizontal or high-angle well includes a screen main body and a protective frame. The screen main body has screen rods arranged in the circumferential direction of the well screen and a screen wire wound on the screen rods. The protective frame includes protective rods located outside of the screen wire in the circumferential direction and extending in the axial direction of the well screen, annular rod holding members spaced at intervals in the axial direction for holding the protective rods, and a protective wire wound about the protective rods. When the well screen passes through a bent section of the well, the protective frame slides in contact with the wall surface of the bent section thereby protecting the screen wire. A gap of a predetermined value is formed between the protective rods and the outer surface of the screen wire of the screen main body so that, by adjusting this gap suitably, the screen wire will pass through a bent section of the well without contacting the protective rods. Even if the screen wire contacts the protective rods, the screen wire will not receive a damaging force from the protective rods.
Moffat & Co.
Nagaoka Tadayoshi
Nagaoka International Corporation
LandOfFree
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