Expandable well screen

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/10 (2006.01) E21B 43/08 (2006.01)

Patent

CA 2284865

An expandable well screen for preventing migration of sand or other solid particles into a hydrocarbon fluid production well comprises a number of filter sheets (3) with circumferential slots (6), which sheets (3) are secured in an iris-shaped configuration and co-axial to an expandable slotted carrier tube (1) such that as result of expansion of the tube (1) the amount of overlap between adjacent filter sheets (3) is reduced. The circumferential slot pattern of the slots (6) enables the filter sheets (3) to slide easily relative to each other and to avoid buckling and/or tearing of the filler sheets during the expansion process.

Ce filtre expansif, destiné à un puits et servant à empêcher la migration de sable ou autres particules solides dans un puits de production d'un fluide hydrocarbure, comprend un certain nombre de feuilles filtrantes (3), lesquelles sont pourvues de fentes périphériques (6), sont fixées selon un agencement en forme d'iris et sont coaxiales avec un tube porteur (1) fendu et expansif, de façon que par suite de l'expansion du tube (1), l'importance du chevauchement entre les feuilles filtrantes adjacentes (3) soit diminué. Le motif de fente périphérique des fentes (6) permet aux feuilles filtrantes (3) de coulisser relativement facilement l'une par rapport à l'autre et d'éviter que ces feuilles ne se gondolent et/ou ne se déchirent pendant le processus d'expansion.

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